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  • 251.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Thaw penetration and thaw settlement studies associated with a road on discontinuous permafrost1988Inngår i: Permafrost: fifth international conference, August 2-5, 1988 / [ed] Kåre Senneset; Kaare Senneset, Trondheim: Tapir Academic Press , 1988, s. 1413-1417Konferansepaper (Fagfellevurdert)
  • 252.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Thaw penetration and thaw settlement studies associated with the Kiruna to Narvik Road, Sweden1984Inngår i: Fourth international conference on permafrost, final proceedings, Natl. Acad. Press , 1984, s. 323-324Konferansepaper (Annet vitenskapelig)
  • 253.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Thaw penetration and thaw settlement studies associated with the Kiruna-Narvik road, Sweden1986Inngår i: Northern Libraries Colloquy: proceedings of the Eleventh Northern Libraries Colloquy, Luleå, Sweden, June 9-12 / [ed] Terje Höiseth; Ann-Christine Haupt, Luleå: CENTEK , 1986Konferansepaper (Annet vitenskapelig)
  • 254.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    The shear strength of frozen soils1981Inngår i: Proceedings of the Tenth international conference on Soil mechanics and foundation engineering, Rotterdam: Balkema Publishers, A.A. / Taylor & Francis The Netherlands , 1981, s. 731-732Konferansepaper (Fagfellevurdert)
  • 255.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    The use of thermopiles and thermosyphones in sub-arctic regions2000Inngår i: Ground freezing 2000 : frost action in soils: proceedings of the International Symposium on Ground Freezing and Frost Action in Soils, Louvain-La-Neuve, Belgium, 11-13 September 2000 / [ed] Jean-Francois Thimus, Rotterdam: Balkema Publishers, A.A. / Taylor & Francis The Netherlands , 2000, s. 344-350Konferansepaper (Fagfellevurdert)
  • 256.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Thermal properties of bentonite based barriers: theoretical considerations and laboratory tests with special reference to the Buffer Mass Test in Stripa mine1985Licentiatavhandling, monografi (Annet vitenskapelig)
  • 257.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Tjälgeoteknik: ett hett forskningsområde vid Luleå tekniska universitet1998Inngår i: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, nr 4, s. 41-43Artikkel i tidsskrift (Annet vitenskapelig)
  • 258.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Tjälproblem i lerterrass2018Rapport (Annet vitenskapelig)
  • 259.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Volume changes accompaning creep of frozen soil1987Inngår i: Port and ocean engineering under arctic condition: [international Conference on Port and Ocean Engineering under Arctic Conditions] / [ed] W. Sackinger; M. O. Jeffries, Fairbanks: The Geophysical Institute University of Alaska , 1987Konferansepaper (Fagfellevurdert)
  • 260.
    Knutsson, Sven
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Berglund, Andreas
    Forsman, Joakim
    Nya möjligheter för laboratorieförsök på grovkornigt jordmaterial2009Inngår i: Bygg & Teknik, ISSN 0281-658X, Vol. 101, nr 1, s. 74-77Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 261.
    Knutsson, Sven
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Chandler, Neil
    Domaschuk, Len
    Analysis of large scale laboratory and in situ frost heavy tests1985Rapport (Annet vitenskapelig)
  • 262.
    Knutsson, Sven
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Domaschuk, Len
    Chandler, Niel
    University of Manitoba, Winnipeg.
    Analysis of large scale laboratory and in situ frost heave tests1985Inngår i: Proceedings of the Fourth international symposium on ground freezing / [ed] Seiiti Kinosita; Masami Fukuda, Rotterdam: Balkema Publishers, A.A. / Taylor & Francis The Netherlands , 1985, s. 65-70Konferansepaper (Fagfellevurdert)
  • 263.
    Knutsson, Sven
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Holmbom, Magnus
    Larsson, Carl
    Snö på lutande tak: en typ av laviner2007Inngår i: Bygg & Teknik, ISSN 0281-658X, Vol. 99, nr 4, s. 49-54Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 264.
    Knutsson, Sven
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Jantzer, Isabel
    Freezing effects in a hydropower dam core in Sweden2007Inngår i: Proceedings of the 8th International Symposium on Cold region Development ISCORD 2007: September 25-27, 2007, Tampere, Finland, 2007Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The hydropower embankment dam in Suorva, Sweden, is located in north of the Arctic Circle. The region is known for cold winters and severe wind conditions. The construction was completed in 1972 and has since then been exposed to a wide temperature range and low annual mean temperatures, leading to the presumption that the fine-grained frost susceptible moraine core of the embankment was exposed to cyclic freezing and thawing. The aim of this project was to find indications for freezing processes that affect the structure of the soil. The project included field investigations and a theoretical thermal analysis carried out with a commercial finite element program. Results from this analysis showed that the freezing plane advances to a maximum depth of 5 m from the top of the core. Hence, it may be possible that frost action affects the construction in its function as hydraulic barrier. Softening due to freeze/thaw can form initial soft part where internal erosion may be initiated thus causing weak points in the dam structure.

  • 265.
    Knutsson, Sven
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Johansson, Teddy
    KTH/SKANSKA.
    Konsekvenser av frysning och tining på finkornig jords egenskaper2005Inngår i: Bygg & Teknik, ISSN 0281-658X, Vol. 97, nr 1, s. 48-52Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 266.
    Knutsson, Sven
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Jones, Michael J
    Proceedings of the conference on the application of rock mechanics to cut and fill mining, Luleå, Sweden, June 1-3, 19801981Collection/Antologi (Annet vitenskapelig)
  • 267.
    Knutsson, Sven
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Lundström, Staffan
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik.
    Mattsson, Hans
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Hellström, Gunnar
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik.
    Project: Internal erosion in embankment dams2010Annet (Annet (populærvitenskap, debatt, mm))
    Abstract [en]

    Since older embankment dams have a tendency to gradually display an increased degree of leakage it is interesting to find out if this phenomenon can be captured by an inverse modelling approach. Numerical tests with a model system will hopefully lead to a better understanding of the decomposition of material in dams and enhance the knowledge about the long term effects in order to forsee potential problems in the future.These embankment dams typically consist of a central core of moraine that is surrounded by a filter, a transition layer and a fill material. Ideally the seepage through the dam is relatively small and the effect on the dam from the flow is negligible. However, in reality there are several situations that promote a fatal failure of the dam including overtopping at high flood discharges, internal erosion and seepage problems in the embankment and the foundation. The status of embankment dams are generally examined by in-situ measurement of one or several of the following quantities: pore pressure, inclination and settlement, temperature, resistivity, self-potential, seepage rate, turbidity of the seepage water, ground penetration radar and bore hole tomography. These indirect and/or discrete methods give indication of the condition of the dam leaving the real situation for the imagination. Hence, when there are alterations to measured values great efforts are often spent on reinforcing dams in order to keep a high safety level. An increased knowledge of the composition of material in dams would enable the usage of focused measures reducing the costs and increasing the safety.

  • 268.
    Knutsson, Sven
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Macsik, Josef
    Ecoloop, Stockholm.
    Svedberg, Bo
    Modell för miljöbedömning av korniga material2003Inngår i: Bygg & Teknik, ISSN 0281-658X, Vol. 95, nr 1, s. 66-69Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 269.
    Knutsson, Sven
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Mai, Henrik
    Eurenius, Jan
    Sweco AB.
    Dams and hydropower plants on permafrost1989Inngår i: International Water Power and Dam Construction, ISSN 0306-400X, E-ISSN 1538-6414, Vol. 41, s. 26-35Artikkel i tidsskrift (Fagfellevurdert)
  • 270.
    Knutsson, Sven
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Pousette, Kerstin
    Hur ska uppgrävd sulfidjord hanteras?2006Inngår i: Bygg & Teknik, ISSN 0281-658X, Vol. 98, nr 2, s. 59-62Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 271.
    Knutsson, Sven
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Rostmark, Susanne
    FriGeo AB.
    Sanera förorenade sediment med frysmuddring2004Inngår i: Bygg & Teknik, ISSN 0281-658X, Vol. 96, nr 1, s. 71-75Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 272.
    Knutsson, Sven
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Rydén, Clas-Göran
    Porvattenövertryck i tinande jord1984Rapport (Annet vitenskapelig)
  • 273.
    Knutsson, Sven
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Viklander, Peter
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Hur påverkar geotekniska borrmetoder omkringliggande jordmaterial?: Jämförelse av några borrningsmetoders påverkan via fullskaleförsök i Malmberget.2013Inngår i: Bygg & Teknik, ISSN 0281-658X, nr 1, s. 43-45Artikkel i tidsskrift (Annet vitenskapelig)
  • 274.
    Knutsson, Sven
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Viklander, Peter
    Kujala, Kauko
    Oulu University of Technology.
    Permeability changes in soil liners due freezing and thawing1998Inngår i: Proceedings of the Symposium on Microstructural modelling og natural and artifically prepared clay soils with special emphasis on the use of clays for waste isolation: Lund, 12-14 October 1998 / [ed] Roland Pusch, Lund, 1998, s. 94-102Konferansepaper (Fagfellevurdert)
  • 275.
    Knutsson, Sven
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Vikström, Lars
    LTU.
    Fältförsök av Wavins nedstigningsbrunnar "Euro Manholes"1999Rapport (Annet vitenskapelig)
  • 276.
    Knutsson, Sven
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Vikström, Lars
    Luleå tekniska universitet.
    Fältstudie av en axiellt töjbar plastbrunns egenskaper i tjällyftande jord: en fältstudie av "wavinbrunnen"1983Rapport (Annet vitenskapelig)
  • 277.
    Knutsson, Sven
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Vikström, Lars
    Luleå tekniska universitet.
    Laboratory study of strength reduction in thawing soils1994Inngår i: Proceedings: Polartech '94 - International Conference on Development and Commercial Utilization of Technologies in Polar Regions, March 22-25, 1994 Luleå, Sweden, Högskolan i Luleå , 1994, s. 425-Konferansepaper (Annet vitenskapelig)
  • 278.
    Knutsson, Sven
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Westerberg, Bo
    Underballast av krossmaterial: dimensioneringsfilosofi1999Rapport (Annet vitenskapelig)
  • 279.
    Larsson, Rolf
    et al.
    Statens Geotekniska Institut.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Tremblay, Maurius
    Statens Geotekniska Institut.
    Öberg-Högsta, Anna-Lena
    Statens Geotekniska Institut.
    Siltjordars egenskaper: silt som konstruktionsmaterial - bestämning av geotekniska egenskaper1998Rapport (Annet vitenskapelig)
    Abstract [sv]

    (1) Silt - förekomst och speciella egenskaper; (2) Grundvattenförhållanden och utvärdering av portryck; (3) Tjälproblematik; (4) Fältundersökning; (5) Laboratorieprovning; (6) Beräkning av släntstabilitet och bärighet för fundament; (7) Beräkning av sättningar; Appendix: Beräkning av släntstabilitet till negativa portryck.

  • 280. Larsson, Rolf
    et al.
    Westerberg, Bo
    Albing, Daniel
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Carlsson, Eric
    Sulfidjord: geoteknisk klassificering och odränerad skjuvhållfasthet2007Rapport (Annet vitenskapelig)
    Abstract [sv]

    I denna rapport redovisas resultaten av ett forskningsprojekt av skjuvhållfastheten i finkornig sulfidjord längs Norrlandskusten. Undersökningens syfte har varit att på basis av egna resultat och vad som i övrigt är rapporterat i litteraturen beskriva den odränerade skjuvhållfastheten i sulfidjord och att ge rekommendationer för hur den lämpligen bestäms. Eftersom rekommendationerna i många delar skiljer sig från de som ges för annan typ av finkornig jord har det också varit viktigt att klargöra vad som här menas med sulfidjord och hur denna bör klassificeras. Med sulfidjord avses i detta sammanhang sulfidjord i Norrlands kustland, dvs. vad som förr kallades svartmocka. För att räknas in i denna kategori bör jorden ha en organisk halt av minst 1%. I undersökningen har ingått sulfidjordar med lerhalter upp till 40% och organiska halter upp till ca 10%. För eventuellt förekommande sulfidjordar med högre lerhalter och/eller organiska halter bör de utvärderingsregler som gäller för lera och organisk jord användas parallellt. Sulfidfärgad jord inom samma område med organiska halter lägre än 1% bör ur rent geoteknisk synvinkel inte klassificeras som sulfidjord utan behandlas som övrig jord med motsvarande kornfördelning. De aktuella sulfidjordarna har således en sammansättning som enligt geotekniska benämningsregler i huvudsak skulle klassificera dem som organisk silt eller organisk siltig lera och i fall med organiska halter högre än 6% som siltig eller lerig gyttja. Resultaten i denna undersökning visar också att hållfasthetsegenskaperna i sulfidjord normaliserade mot jordens organiska halt och spänningshistoria i stort följer samma mönster som för övrig organisk mineraljord och mineralisk organisk jord. Vad som geotekniskt främst skiljer sulfidjorden från de flesta andra finkorniga svenska jordarna är att den gradvisa övergång med först minskande korsstorlek och sedan ökande organisk halt från silt, siltig lera, lera, organisk lera till organisk jord och som avspeglas i jordens flytgräns, inte gäller för siltig organisk jord som sulfidjord. Detta medför att de empiriska utvärderingar av olika parametrar och försöksresultat som bygger på den nämnda kopplingen till flytgränsen oftast inte kan användas i sulfidjord. Enligt resultaten i denna undersökning bör hållfasthetsvärden för sulfidjord bestämda med fallkonförsök i laboratoriet och vingförsök i fält korrigeras med en faktor av 0,65. Spridningen i resultaten var relativt stor och korrektionsfaktorns variationskoefficient var ca 16-17%. Den odränerade skjuvhållfastheten respektive förkonsolideringstrycket bör ur CPT-sondering i sulfidjord utvärderas med konfaktorerna 20 respektive 4,75. Spridningen i resultaten från CPT-sonderingarna var liten och variationskoefficienterna för konfaktorerna, (faktorerna 20 respektive 4,75), var 10 respektive 8%. I de fall den odränerade skjuvhållfastheten är avgörande och osäkerhet om erforderlig säkerhet mot brott finns, bör komplettering göras med i första hand direkta skjuvförsök. Bedömning av förkonsolideringstrycket ur resultaten av CPT-sonderingar används främst som ett hjälpmedel för att kvalitativt bedöma förkonsolideringstryckets variation mot djupet och att med hjälp därav sammanbinda de enskilda värdena från ödometerförsök. I rapporten ges ett empiriskt samband för uppskattning av den initiella skjuvmodulen. Närmare rekommendationer för hur den odränerade skjuvhållfastheten bör bestämmas ges i kapitlet "Slutsatser och rekommendationer", som bör användas tillsammans med SGI Information Nr 3 (revision 2007) "Utvärdering av odränerad skjuvhållfasthet i kohesionsjord". Kapitlet "Slutsatser och rekommendationer" omfattar också övriga försök som bör utföras för en korrekt klassificering av jorden och för att föreslagna empiriska korrelationer skall kunna utnyttjas.

  • 281.
    Lintzén, Nina
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Snow storage: modelling, theory and some new research2018Inngår i: Cold Regions Science and Technology, ISSN 0165-232X, E-ISSN 1872-7441, Vol. 153, s. 45-54Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The arrival of natural snow is often delayed nowadays due to global warming. This causes problems for ski resorts and other places where winter activities in different forms take place. Storing snow provides one solution for the winter business industry to deal with this problem. However, there is so far very little research concerning this question. In this paper a review of current knowledge of snow storage and experiences from mainly Scandinavian snow storages is presented. New results concerning melting losses of stored snow from a trial experiment in the north of Sweden are presented. These results are compared to theoretical calculations. The model used for the calculations is shown to be useful for estimating melting losses of insulated piles of snow. Thus the calculations can serve as an important background when designing an insulated snow depot. The model can also be used to compare different insulating materials and to determine properties such as thickness of the insulating layer needed to sufficiently insulate the snow. By minimizing the surface area of insulated snow depots, melt rate due to heat from the air, sun and sky, which constitute the largest part of the total melt, can be reduced. The quality of insulating materials used will be subject to annual observation. Commonly used insulating materials such as bark, wood chips, cutter shavings and sawdust deteriorate.

  • 282.
    Magnusson, Ove
    et al.
    Skanska.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Behaviour of compacted earth-fill embankments constructed during winter and summer conditions1993Inngår i: Engineered Fills: Proceedings of the Conference Engineered Fills '93, Held on 15-17 September 1993 in Newcastle Upon Tyne / [ed] B. G. Clarke, London: Thomas Telford Ltd , 1993, s. 320-330Konferansepaper (Fagfellevurdert)
  • 283.
    Magnusson, Ove
    et al.
    Luleå tekniska universitet.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Deformationer i sommar- och vinterbyggd vägbank: uppföljning av mätningar i fält och laboratorium1992Rapport (Annet vitenskapelig)
  • 284.
    Magnusson, Simon
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Lundberg, Kristina
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Svedberg, Bo
    Ecoloop, Stockholm.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Sustainable Management of Excavated Soil and Rock: A Literature Review2015Inngår i: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 93, s. 18-25Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Construction in developing urban areas implies use of construction materials from quarries and excavation of soil and rock. From a resource perspective, there could be benefits from using excavated soil and rock as a construction material. The aim of this paper is to describe the material flow and management practices of urban excavated soil and rock from the perspective of resource efficiency. A conceptual model for the urban flow of excavated soil and rock was developed and a literature review concerning the management of excavated soil and rock was conducted. The conceptual model was subsequently used to clarify the different perspectives of the scientific literature and knowledge gaps. Conclusions drawn are that there is little knowledge about the quantities and the fate of excavated soil and rock in urban regions. Current research is focusing on the waste flows of construction material and little is known about the overall management practices of excavated soil and rock. Clearly, excavated soil and rock are often disposed at landfills and the recycling rate for high quality purposes is low. There is a need to evaluate the potential for an increased use of excavated soil and rock as construction material. However, the overall efficiency of urban construction material management can only be evaluated and improved by also including construction materials produced in quarries.

  • 285. Mainali, Ganesh
    et al.
    Nordlund, Erling
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Thunehed, Hans
    Geovista AB.
    Tailings dams monitoring in Swedish mines using self-potential and electrical resistivity methods2015Inngår i: The Electronic journal of geotechnical engineering, ISSN 1089-3032, E-ISSN 1089-3032, Vol. 20, nr 13, s. 5859-5875Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Tailings dam failures have been occurring in recent years. Many of these failures have caused human casualties, destruction of property, and damage to environment and huge economic loss to the mining industry. The monitoring of the dam is essential to know the existing state of the dams and to ensure the safety of the dam over its life time. The present study has been conducted to test the applicability of electrical resistivity and self-potential (SP), for detecting anomalous seepage through mine tailings dams in Sweden and monitoring the physical condition of the dam. This study has demonstrated the potential of using geoelectrical methods for monitoring the conditions of the tailing dams related to seepage.

  • 286. Makusa, Gregory
    et al.
    Macsik, Josef
    Ecoloop Stockholm.
    Holm, Göran
    Swedish Geotechnical Institute, Linkoping.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Process Stabilization- Solidification and the Physicochemical Factors Influencing the Strength Development of Treated Dredged Sediments2016Inngår i: Geo-Chicago 2016: sustainable waste management and remediation : selected papers from sessions of Geo-Chicago 2016, August 14-18, 2016, Chicago, Illinois / [ed] Nazli Yesiller; Dimitrios Zekkos; Arvin Farid; Anirban De; Krishna R Reddy, Reston, Va: American Society of Civil Engineers (ASCE), 2016, s. 532-545Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Process stabilization-solidification (PSS) is a convenient technology for amending high water content dredged sediments (DS) with binders. The PSS equipment comprises of a chassis that carries a pugmill and silos of up to four binders. Primary binders such as cement can be supplemented with pozzolanas materials. In this study, physicochemical interactions of single and composite (ternary) binders on strength development of treated DS are examined based on laboratory and a large-scale field tests. The findings of this study show that the unconfined compressive strength (UCS) depends on the amount of cement in the blend. The UCS decreased with increasing water/cement ratio. It is concluded that (i) the use of constant amounts of composite binder at increasing initial water content of the DS contributes to increased water/cement ratio; (ii) underwater discharge of stabilized DS prior to the initial setting increases the water/cement ratio of stabilized mass; and (iii) presence of mineral admixture hinders strength development of treated dredged sediments

  • 287.
    Makusa, Gregory
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Mácsik, Josef
    Strategic services & Sustainable Development at Ecoloop, Luleå tekniska universitet, SCC/Ramböll, Ecoloop, Stockholm.
    Holm, Göran
    Statens Geotekniska Institut, Linköping, Luleå tekniska universitet.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    A laboratory test study on effect of freeze–thaw cycles on strength and hydraulic conductivity of stabilized dredged sediments2016Inngår i: Canadian geotechnical journal (Print), ISSN 0008-3674, E-ISSN 1208-6010, Vol. 53, nr 6, s. 1038-1045Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Dredged sediments with initial water content between 200% and 400% were treated with single and composite binders. Samples were subjected to open and semi-closed freeze-thaw (f-t) cycles to investigate the impact of f-t cycling on hydraulic conductivity (HC) and unconfined compressive strength (UCS). A grace period (GP) for thaw consolidation is included to assess healing potential of the affected stabilized mass. The findings of this study show that the impact of f-t cycles depend on initially achieved UCS and HC values prior to the f-t cycling and time of testing after f-t cycles. The HC of specimens with initially UCS value of 87 kPa increased with number of f-t cycles. The UCS values decreased in the range of 50%-80% when specimens were tested directly after the thaw period and values decreased in the range of 14%-60% when specimens were tested at the end of GP. The HC of specimens with initial UCS value of 299 kPa remained almost the same. These samples experienced permanent loss in the UCS values, irrespective of time of testing. Detrimental effects of the freezing action on the UCS were greater under semi-closed than open freezing conditions.

  • 288.
    Makusa, Gregory
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Mácsik, Josef
    Ecoloop, Stockholm.
    Holm, Göran
    Statens Geotekniska Institut, Linköping.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Process stabilization–solidification and physicochemical factors influencing strength development of treated dredged sediments2016Inngår i: Geo-Chicago 2016: Sustainable Waste Management and Remediation / [ed] Nazli Yesiller; Dimitrios Zekkos; Arvin Farid; Anirban De; Krishna R. Reddy, Chicago, Illinois: American Society of Civil Engineers (ASCE), 2016, Vol. GSP 273, s. 532-545Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Process stabilization–solidification (PSS) is a convenient technology for amending high water content dredged sediments (DS) with binders. The PSS equipment comprises of a chassis that carries a pugmill and silos of up to four binders. Primary binders such as cement can be supplemented with pozzolanas materials. In this study, physicochemical interactions of single and composite (ternary) binders on strength development of treated DS are examined based on laboratory and a large–scale field tests. The findings of this study show that fixed amount of cement content at increasing initial water content of the DS contribute to decreased level of calcium ions in the blend. Organic matter in the DS retains calcium ions liberated during cement hydration. This causes delay in formation of calcium hydroxide (CH), nucleation and crystallization of calcium silicate hydrates (CSH). Delay in the formation of CH hinders pozzolanic reaction of mineral admixture. Furthermore, increased amount of free water surrounding the stabilized mass causes weakening effect on CSH bond and pH neutralization. It is concluded that strength development of dredged sediments will depend on the amount of cement in the blend in relation to mineral admixture, initial water content of the DS, and the amount of organic matters.

  • 289.
    Makusa, Gregory Paul
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Bradshaw, Sabrina, L.
    University of Wisconsin-Madison.
    Berns, Erin
    University of Wisconsin-Madison.
    Benson, Craig, H.
    University of Wisconsin-Madison.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Freeze-thaw cycling and the hydraulic conductivity of geosynthetic clay liners concurrent with cation exchange2014Inngår i: Canadian geotechnical journal (Print), ISSN 0008-3674, E-ISSN 1208-6010, Vol. 51, nr 6, s. 591-598Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Tests were conducted to assess the effect of cation exchange coincident with freeze-thaw cycling on the hydraulic conductivity of a geosynthetic clay liner (GCL). GCLs were prehydrated by contact with silica flour moistened with synthetic subgrade pore water and subsequently permeated with a solution representing the pore water in the cover soil over a tailings facility. Control tests were conducted using the same procedure except deionized water (DI) was used as the permeant liquid to preclude cation exchange from the permeant liquid. The GCLs were subjected to 1, 3, 5, 15, and 20 freeze-thaw cycles, and the hydraulic conductivity and exchange complex were determined after each freeze-thaw increment to assess chemical changes that occurred during freezing, thawing, and permeation. GCLs undergoing freeze thaw cycling experienced little to no cation exchange until 15 freeze-thaw cycles. After 20 freeze-thaw cycles, however, 50% of the sodium (Na) initially in the exchange complex was replaced by calcium (Ca). Dissolution of calciate within the bentonite is a likely source of the Ca. Hydraulic conductivity of GCLs exposed to freeze-thaw cycling was lower than the hydraulic conductivity of a new GCL permeated with DI water (< 2.2x10-11 m/s). A small increases in hydraulic conductivity (~2.3 times), which may have been caused by cation exchange, occured at 15 and 20 freeze-thaw cycles but the hydraulic conductivity remained below that obtained by direct permeation with DI water.

  • 290.
    Makusa, Gregory Paul
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Mattsson, Hans
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Investigation of increased hydraulic conductivity of silty till subjected to freeze–thaw cycles2013Inngår i: nr STP 1568, s. 33-46, artikkel-id STP156820120139Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The hydraulic conductivity of silty till increases when the till is subjected to freeze–thaw cycles. A dramatic increase normally occurs after the first freeze–thaw cycle, and the magnitude generally depends on the initial or molding water content. Freezing of silty till causes aggregations of clods and the formation of macrostructure. The initial or molding water content determines the number of freeze–thaw cycles required to complete the agglomeration of clods and the formation of stable macrostructures, which in turn controls the hydraulic conductivity of compacted specimens frozen and thawed in the laboratory. The findings of this study show that for specimens compacted wet of the optimum water content, a significant increase in the hydraulic conductivity was measured after the first freeze–thaw cycle. When specimens were compacted at the optimum water content, a number of freeze–thaw cycles were required in order to obtain the corresponding significant increase in the hydraulic conductivity.

  • 291.
    Makusa, Gregory Paul
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Mattsson, Hans
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Shear strength evaluation of preloaded stabilized dredged sediments using CPT2014Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The undrained shear strength of preloaded stabilized dredged sediments increases with curing time. Evaluation of in-situ undrained shear strength using cone penetration test (CPT) data normally requires calibration of the CPT data with known undrained shear strength from vane shear test to obtain the cone factor, which is normally utilized in CPT empirical correlation to estimate the undrained shear strength. In this study, a new CPT empirical correlation for evaluation of in-situ undrained shear strength is presented. The proposed empirical correlation utilizes the effective vertical stress characteristic ratio to estimate the CPT induced stress, which was correlated to the in-situ undrained shear strength. The undrained shear strength computed using the proposed empirical correlation agrees reasonably well with the undrained shear strength estimated using the established empirical correlation at a large-scale field test.

  • 292.
    Makusa, Gregory Paul
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Mattsson, Hans
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Verification of field settlement of in-situ stabilized dredged sediments using cone penetration test data2012Inngår i: The Electronic journal of geotechnical engineering, ISSN 1089-3032, E-ISSN 1089-3032, Vol. 17, nr Y, s. 3665-3680Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Utilization of in-situ mass stabilization for geotechnical applications is increasing. Laboratory tests may have drawbacks on valuations of engineering parameters for estimations of settlement of in-situ stabilized soil mass. Factors such as compression, mixing work, homogeneity and curing temperature may influence the differences in mechanical properties between laboratory test results and achieved field values. Therefore, utilization of appropriate in-situ mechanical parameters may be required during design analyses. Various in-situ tests are available for use in geotechnical context. Among others, cone penetration test (CPT) is one of most widely used in-situ tests. Numerous CPT empirical correlations are available for use in conventional soils. Utilization of such CPT empirical correlations for in-situ stabilized soils has to be examined. In this paper, the in-situ constrained modulus was evaluated using conventional CPT empirical correlation and utilized as oedometer modulus in finite element analysis for estimation of settlement of preloaded in-situ stabilized dredged sediments. The results show that, computed settlement values fall within the range of measured one. These findings suggest that, the cone penetration test and its empirical correlations, which were established for conventional soils, can also be utilized in stabilized soils.

  • 293.
    Mattsson, Hans
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Hellström, J. Gunnar I.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik.
    Lundström, Staffan
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    On numerical modelling of internal erosion in embankment dams2009Inngår i: Proceedings 1st International Symposium on Rockfill Dams: October 18-21, 2009, Chengdu, China, 2009Konferansepaper (Fagfellevurdert)
  • 294.
    Mattsson, Hans
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Zardari, Muhammad Auchar
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Ormann, Linda
    Sweco, Karlstad.
    Gruvdammar och deras stabilitet2012Inngår i: Bygg & Teknik, ISSN 0281-658X, Vol. 104, nr 1, s. 49-52Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 295.
    Mill, O.
    et al.
    Svenska Kraftnät.
    Dahlbäck, N.
    Vattenfall.
    Worman, A
    Kungliga tekniska högskolan, KTH.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Johansson, F.
    Kungliga tekniska högskolan, KTH.
    Andreasson, Patrik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik.
    Yang, J.
    Kungliga tekniska högskolan, KTH.
    Lundin, U.
    UU.
    Aidanpää, Jan-Olov
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Nilsson, H.
    CTH.
    Cervantes, Michel
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik.
    Glavatskih, Sergei
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Analysis and development of hydro power research: synthesis within Swedish Hydro Power Centre2010Rapport (Annet vitenskapelig)
    Abstract [en]

    The market for hydropower re-investments in Sweden is approx 2.5 billion SEK/yr the coming decade. Large investments will also be carried out in Swedish tailing dams. This will result in challenging projects and need of experts. A crucial factor for a successful management of these challenges is the supply of engineers and researchers with hydro power and dam skills and knowledge. Swedish Hydro Power Centre (Svenskt vattenkraftcentrum, SVC) is a competence centre for university education and research environments within hydro power and mining dams. SVC comprises of two knowledge areas: Hydraulic Engineering and Hydro Turbines and Generators, respectively. SVC builds high-quality and long term sustainable knowledge at selected universities...

  • 296.
    Minh, Thao Hoang-
    et al.
    Hanoi University of Science, Vietnam National University.
    Nguyen-Thanh, Lan
    Institute of Geography and Geology, Ernst-Moritz-Arndt-University of Greifswald, Technical University of Darmstadt.
    Nguyen, Thuy-Duong
    Hanoi University of Science, Vietnam National University.
    Nguyen, Duc-Thanh
    Vietnam Atomic Energy Institute.
    Lai, Le Thi
    Institute of Geological Sciences, Vietnam Academy of Science and Technology.
    Thuyet, Nguyen Thi Minh
    Hanoi University of Science, Vietnam National University.
    Kasbohm, Jörn
    Institute of Geography and Geology, Ernst-Moritz-Arndt-University of Greifswald, University of Greifswald, GeoENcon Ltd.
    Pusch, Roland
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Mineralogical Characterization of Di Linh Bentonite, Vietnam: A Methodological Approach of X-ray Diffraction and Transmission Electron Microscopy2014Inngår i: Proceedings of 13th International Symposium on Mineral Exploration (ISME-XIII): Toward Sustainable Society with Natural Resources - Frontiers in Earth Resources Technologies and Environmental Conservation / [ed] Noriyoshi Tsuchiya; Mai Trong Nhuan; Thao Hoang-Minh; Tatsu Kuwatani, Hanoi: Vietnam National University Press, Hanoi , 2014, s. 143-148Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Vietnam has decided to establish nuclear power as further energy option. In order to develop a Vietnamese reference bentonite as potential barrier in a final repository for high radioactive waste, a detailed mineralogical investigation of Di Linh bentonite (Lam Dong province), lacustrine clay, was carried out by different methods especially transmission electron microscopy (TEM) linked with energy-dispersive X-ray (EDX). From a sample homogenized from 5 tones of the bentonite, mineral formulae of clay particles was calculated The calculation also focuses on randomly interstratifications of two and three members. The fraction <2 μm of Di Linh bentonite is composed mainly by montmorillonite (Ca0.06Mg0.03Na0.09K0.03Al1.39Fe0.25Mg0.26(OH)2 Si3.96Al0.04O10) and regular ordering (R1) illite-smectite interstratifications with K- and charge-deficiency (Ca0.04Mg0.07Na0.18K0.16Al1.76Fe0.08Mg0.16(OH)2Si3.62Al0.38O10). Additionally, Fe-poor kaolinite-smectite-vermiculite interstratifications and trace of Fe-rich chloritesmectite- vermiculite interstatifications were identified. TEM-investigations showed analytical proofs of the sedimentary character of smectite formation in the Di Linh deposit. Parent muscovite was weathered in several steps in two different environments: (i) K-leaching and layer-wise alteration into kaolinite; (ii) further edge- controlled alteration of mica into lathlike montmorillonite particles under dissolution of kaolinite layers from former kaolinite-mica intergrowths. Mineralogical composition of the Di Linh bentonite with mainly montmorillonite and illite-rich illite-smectite interstratifications shows that the Di Linh bentonite can be a suitable barrier candidate in final repositories.

  • 297.
    Mohammad, M. E.
    et al.
    Department of Dams and Water Resources Engineering, University of Mosul, Mosul, Iraq.
    Al-Ansari, Nadhir
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Application of SWAT model to estimate the annual runoff and sediment of Duhok reservoir watershed2016Inngår i: Icse 2016 Scour and Erosion Proceedings of the 8th International Conference on Scour and Erosion: Oxford, Uk< 12-15 September 2016 / [ed] Harris, John; Whitehouse, Richard; Moxon, Sarah, London: Taylor & Francis Group, 2016, s. 1129-1136Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Estimation of runoff volume and sediment load is a problem that directly affects the performance of dams due to the reduction in the storage capacity of their reservoirs and their effect on dam efficiency and operation schedule. The simulation models can be considered for evaluation of sediment potential if the continuous field measurements are not available. Soil and Water Assessment Tool (SWAT) was applied to estimate the annual runoff volume and sediment load for Duhok Dam Reservoir in north of Duhok/Iraq for the period 1988–2011. The estimated annual runoff volume varied from2.6 to 34.7 MCM. Those values are affected by rainfall depth, intensity and runoff coefficient, while the annual runoff coefficient for the studied area ranged from 0.06 to 0.33 (average is 0.19) causing an average runoff volume of 14.3 MCM. The sediment routing indicated that the values of sediment yields varied from 50 to 1400 t/km2/year depending on sub basin properties. The average annual sediment load from the whole watershed was 124.6 *103 ton. The estimated total sediment arrived to Duhok Reservoir for the considered period 1988–2011 was about 2.99*106 ton.

  • 298.
    Mohammad, Mohammad E.
    et al.
    Department Dams and Water Resources Engineering, University of Mosul.
    Al-Ansari, Nadhir
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mining and Geotechnical Engineering - Swedish Blasting Research Centre.
    Issa, Issa E.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Sediment in Mosul Dam reservoir using the HEC-RAS model: Sediment in Mosul Dam reservoir using the HEC-RAS model2016Inngår i: Lakes & Reservoirs: Research and Management, ISSN 1320-5331, E-ISSN 1440-1770, Vol. 21, nr 3, s. 235-244Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Mosul Dam, located on the Tigris River north of Iraq, is experiencing sedimentation problems, especially near the Al-Jazeera pumping station that supplies the irrigation water for the Al-Jazeera project. The sources of the sediment accumulated within the reservoir are from the Tigris River, as well as ten side valleys on both sides of the reservoir. The sediment inflow rate into the reservoir and the released values are considered on the basis of the operation schedule of the dam for the considered period from 1986 to 2011. The sediment loads were estimated on the basis of available measurements and estimated literature values. The HEC-RAS 4.1 model was used for flows and sediments in the main river and  reservoir. The model was calibrated for flow simulations (coefficient of determination r2 = 0.87) and sediment routing based on bed level, (with resultant r2 = 0.98 and Mean Absolute Deviation of 0.95). The Ackers–White equation was used in the HEC-RAS model for sediment routing because of the wide range of sediment sizes in the study case. The resultant total accumulated sediment load volume was 1.13 km3, a value that is very close to the measured values (1.143 km3) obtained from a previous bathymetric survey. Furthermore, the model indicated most of the sediment (80.7%) was deposited during the first five of the dam operation.

  • 299.
    Mohammad, Mohammad E.
    et al.
    Department of Dams and Water Resources Engineering, University of Mosul.
    Al-Ansari, Nadhir
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Annual Runoff and Sediment in Duhok Reservoir Watershed Using SWAT and WEPP Models2016Inngår i: Engineering, ISSN 1947-3931, E-ISSN 1947-394X, Vol. 8, nr 7, s. 410-422Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Estimation of runoff volume and sediment load is the main problem that affects the performance of dams due to the reduction in the storage capacity of their reservoirs and their effect on dam efficiency and operation schedule. The simulation models can be considered for this purpose if the continuous field measurements are not available. Soil and Water Assessment Tool (SWAT) andWater Erosion Prediction Project (WEPP) models were applied to estimate the annual runoff volume and sediment load for Duhok Dam Reservoir in north of Duhok/Iraq for the period 1988-2011. The estimated annual runoff volume varied from 2.3 to 34.7 MCM for considered period.Those values were affected by rainfall depth, intensity and runoff coefficient. The resultant annual runoff coefficient for the studied area ranged from 0.05 to 0.35 (average was 0.18) causing an average runoff volume of about 14 MCM. The results of sediment routing indicated that the values of sediment yields varied from 50 to 1400 t/km2/year depending on sub basin properties. The average annual sediment load from the whole watershed is about 120 × 103 ton. The estimated total sediment arrived to Duhok Reservoir for the considered period 1988-2011 was about 2.9 × 106 ton. The results indicate that both models gave reasonable results in comparison with measured values. Based on statistical criteria, the results of both models are close to gather.

  • 300.
    O. Abdullah, Twana
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi. Groundwater Directorate of Sulaimani, Kurdistan Region, Iraq.
    S. Ali, Salahalddin
    Department of Geology, University of Sulaimani, Kurdistan Region, Iraq;Komar University of Science and Technology, Sulaimani, Iraqi Kurdistan Region, Iraq.
    Al-Ansari, Nadhir
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Knutsson, Sven
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Assessment of Groundwater Vulnerability to Pollution Using VLDA and COP Models in Halabja Saidsadiq Basin, Iraq2018Inngår i: Journal of Civil Engineering and Architecture, ISSN 1934-7359, E-ISSN 1934-7367, Vol. 12, nr 11, s. 798-809, artikkel-id 003Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Groundwater aquifer in the Halabja and Saidsadiq Basin considered being one of the most important aquifers in terms of water supplying in Kurdistan Region, NE of Iraq. The growing of economics, irrigation and agricultural activities inside the basin makes it of the main essentials to the region. Therefore, pollution of groundwater is of specific worry as groundwater resources are the principal source of water for drinking, agriculture, irrigation and industrial activities. Thus, the best and practical arrangement is to keep the pollution of groundwater through. The current study aims the evaluation of the vulnerability of groundwater aquifers of the study area. Two models were applied, to be specific VLDA and COP to develop maps of groundwater vulnerability for contamination. The VLDA model classified the area into four classes of vulnerability with each covered area: low (2%), moderate (44%), high (53%) and very high (1%). While four vulnerability classes were accomplished dependent on COP model including very low, low, moderate and high vulnerability classes with coverage areas of (1%, 37%, 2% and 60%) respectively. To confirm the suitability of each map for assessment of groundwater vulnerability in the area, it required to be validated of the theoretical sympathetic of current hydrogeological conditions. In this study, groundwater age evaluated utilizing tritium isotopes investigation and applied it to validate the vulnerability results. Based on this validation, the outcome exhibits that the vulnerability classes acquired utilizing VLDA model are more predictable contrasted with the COP model.

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