Change search
Link to record
Permanent link

Direct link
BETA
Publications (10 of 200) Show all publications
Pericault, Y., Risberg, M., Viklander, M. & Hedström, A. (2020). Temperature performance of a heat-traced utilidor for sewer and water pipes in seasonally frozen ground. Tunnelling and Underground Space Technology, 97, Article ID 103261.
Open this publication in new window or tab >>Temperature performance of a heat-traced utilidor for sewer and water pipes in seasonally frozen ground
2020 (English)In: Tunnelling and Underground Space Technology, ISSN 0886-7798, E-ISSN 1878-4364, Vol. 97, article id 103261Article in journal (Refereed) Published
Abstract [en]

Heat-traced utility corridors (utilidors) can be used in cold regions to install the drinking water and sewer pipes in a shallow trench above the frost depth, thereby limiting excavation needs and the associated economic, social, and environmental costs. Several of these infrastructures were built in the 60s and 70s in Canada, Alaska, Russia, and Norway. More recently, a new type of heat-traced utilidor was built as a pilot project in Kiruna, Sweden to increase the viability of district heating in the area by allowing co-location of all the utility pipes in a shallow trench. Despite several reported cases of undesirably warm drinking water from full-scale projects, previous research efforts on heat-traced utilidors have mainly focused on pipe freeze protection, not on the prevention of excessive temperatures of the drinking water. To ensure comfortable drinking water in terms of taste and smell, an upper temperature limit of 15 °C is usually recommended. The objective of this study was to evaluate the long-term ability of a heat-traced utilidor to maintain sewer temperatures above 0 °C and drinking water temperatures between 0 and 15 °C. Pipe temperatures were measured continuously at two cross sections of a heat-traced utilidor located in Northern Sweden over a period of 22 months. A thermal model, set up and calibrated on the measurements, was used to simulate the impact of extraordinary cold weather conditions on the pipes’ temperatures. The results showed that the utilidor could keep the pipe temperatures within the desired ranges in most cases but that special care should be taken during design to limit drinking water temperatures during the summer.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Drinking water distribution, Drinking water temperature, Sewage collection, Low temperature district heating, Pipe insulation, Freeze protection
National Category
Water Engineering Infrastructure Engineering Energy Engineering
Research subject
Urban Water Engineering; Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-73076 (URN)10.1016/j.tust.2019.103261 (DOI)
Funder
Vinnova, 2014-04287Swedish Research Council Formas, 2011-1710
Note

Validerad;2020;Nivå 2;2020-01-29 (johcin)

Available from: 2019-03-01 Created: 2019-03-01 Last updated: 2020-01-29Bibliographically approved
Müller, A., Österlund, H., Marsalek, J. & Viklander, M. (2020). The pollution conveyed by urban runoff: A review of sources. Science of the Total Environment, 709, Article ID 136125.
Open this publication in new window or tab >>The pollution conveyed by urban runoff: A review of sources
2020 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 709, article id 136125Article in journal (Refereed) Published
Abstract [en]

Urban stormwater and snowmelt pollution contributes significantly to the deterioration of surface waters quality in many locations. Consequently, the sources of such pollution have been studied for the past 50 years, with the vehicular transportation sector and the atmospheric deposition identified early as the major pollution sources. In search for mitigation of this pollution, source controls, besides other measures, were recognised as effective pollution mitigation tools, whose successful implementation requires a good knowledge of pollution sources. Even though great research efforts have been exerted to document specific sources of urban runoff pollution, or specific groups of pollutants present in urban runoff, a comprehensive overview of all known contributing sources is still missing. This review contributes to closing this gap by compiling findings of previous research and critically synthesizing the current knowledge of various stormwater pollution sources. As the emphasis is placed on the sources, the related issues of implications for urban surface water quality and possible source controls for individual sources are touched upon just briefly, where required. The review showed that the atmospheric deposition, vehicular transportation-related activities and metallic building envelopes continue to be among the major pollution sources, which have been studied in a far greater detail than other sources. Furthermore, it was noted that because of the rapid advances in clean manufacturing and pollution control technologies, a large part of the body of data on stormwater quality available in the literature should be considered as historical data, which may no longer describe well the current conditions. Progressing historical data obsolescence, combined with continuing releases of new materials and chemicals, and, in some cases of new substances of potential concern, into the environment, suggests that the identification of important stormwater runoff/snowmelt pollution sources, and the associated pollutants, has been and will remain to be a work in progress.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Urban diffuse pollution, Stormwater quality, Snowmelt quality, Emerging pollutants, Source controls
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-76044 (URN)10.1016/j.scitotenv.2019.136125 (DOI)2-s2.0-85077051390 (Scopus ID)
Funder
Swedish Research Council Formas, 942 – 2016-73Vinnova, 2016-05176
Note

Validerad;2020;Nivå 2;2020-01-07 (johcin)

Available from: 2019-09-18 Created: 2019-09-18 Last updated: 2020-01-07Bibliographically approved
Müller, A., Österlund, H., Nordqvist, K., Marsalek, J. & Viklander, M. (2019). Building surface materials as sources of micropollutants in building runoff: A pilot study. Science of the Total Environment, 680, 190-197
Open this publication in new window or tab >>Building surface materials as sources of micropollutants in building runoff: A pilot study
Show others...
2019 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 680, p. 190-197Article in journal (Refereed) Published
Abstract [en]

Control of diffuse pollution is critical for achieving good surface water quality status. In this context, pollutant contributions from building materials have received increased attention in recent decades. This study examined the releases of metals, nonylphenols and phthalates from ten common building surface materials (installed in triplicates) into rainwater runoff from six rain events. The highest releases of metals were from copper and zinc sheets (average concentrations of 3090 μg/L Cu and 7770 μg/L Zn respectively), while other metal materials, e.g., Corten weathering steel, exhibited lower releases. PVC roofing released high concentrations of nonylphenols and phthalates (average concentrations of up to 26 μg/L nonylphenols and 455 μg/L Diisononyl phthalate, DINP) which have not been investigated in the earlier studies. Pollutant releases varied between events, likely because of weather conditions and rainfall characteristics. Study findings should be valuable for environmentally responsible applications of the existing building materials and the development of new ones, as well as the investigations and risk assessment of specific pollutants in stormwater.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Building surface materials, Diffuse pollution sources, Metals, Nonylphenols, Phthalates, Stormwater quality
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-73883 (URN)10.1016/j.scitotenv.2019.05.088 (DOI)000468863400019 ()31108449 (PubMedID)2-s2.0-85065712456 (Scopus ID)
Funder
Swedish Research Council Formas, 942 – 2016-73Vinnova, 2016-05176
Note

Validerad;2019;Nivå 2;2019-06-05 (oliekm)

Available from: 2019-05-09 Created: 2019-05-09 Last updated: 2019-09-18Bibliographically approved
Broekhuizen, I., Leonhardt, G., Marsalek, J. & Viklander, M. (2019). Calibration event selection for green urban drainage modelling. Hydrology and Earth System Sciences Discussions
Open this publication in new window or tab >>Calibration event selection for green urban drainage modelling
2019 (English)In: Hydrology and Earth System Sciences Discussions, ISSN 1812-2108, E-ISSN 1812-2116Article in journal (Refereed) Submitted
Abstract [en]

Calibration of urban drainage models is typically performed based on a limited number of observed rainfall-runoff events, which may be selected from a longer time-series of measurements in different ways. In this study, 14 single- and two-stage strategies for selecting these events were tested for calibration of a SWMM model of a predominantly green urban area. The event selection was considered in relation to other sources of uncertainty such as measurement uncertainties, objective functions, and catchment discretization. Even though all 14 strategies resulted in successful model calibration, the difference between the best and worst strategies reached 0.2 in Nash–Sutcliffe Efficiency (NSE) and the calibrated parameter values notably varied. Most, but not all, calibration strategies were robust to changes in objective function, perturbations in calibration data and the use of a low spatial resolution model in the calibration phase. The various calibration strategies satisfactorily predicted 7 to 13 out of 19 validation events. The two-stage strategies performed better than the single-stage strategies when measuring performance using the Root Mean Square Error, flow volume error or peak flow error (but not using NSE); when flow data in the calibration period had been perturbed by ±40 %; and when using a lower model resolution. The two calibration strategies that performed best in the validation period were two-stage strategies. The findings in this paper show that different strategies for selecting calibration events may lead in some cases to different results for the validation period, and that calibrating impermeable and green area parameters in two separate steps may improve model performance in the validation period, while also reducing the computational demand in the calibration phase.

Place, publisher, year, edition, pages
Copernicus Publications, 2019
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-73294 (URN)10.5194/hess-2019-67 (DOI)
Projects
Reliable modeling of green infrastructure in green urban catchments
Funder
Swedish Research Council Formas, 2015-121
Available from: 2019-03-25 Created: 2019-03-25 Last updated: 2019-04-16
Lindfors, S., Österlund, H., Meyn, T., Muthanna, T. M., Lundy, L. & Viklander, M. (2019). Characterisation of Dissolved Metal Fractions in Urban Runoff. In: : . Paper presented at International conference: Cities, Rain & Risk.
Open this publication in new window or tab >>Characterisation of Dissolved Metal Fractions in Urban Runoff
Show others...
2019 (English)Conference paper, Oral presentation with published abstract (Other academic)
National Category
Engineering and Technology
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-75961 (URN)
Conference
International conference: Cities, Rain & Risk
Available from: 2019-09-11 Created: 2019-09-11 Last updated: 2019-10-22
Pericault, Y., Bruaset, S., Ugarelli, R., Viklander, M. & Hedström, A. (2019). Correcting for the impact of past coordination on the estimation of pipe cohorts survival functions. In: : . Paper presented at 9th International Conference on Sewer Processes & Networks, Aalborg Denmark, August 27-30 2019.
Open this publication in new window or tab >>Correcting for the impact of past coordination on the estimation of pipe cohorts survival functions
Show others...
2019 (English)Conference paper, Oral presentation with published abstract (Other academic)
Keywords
Asset management, coordinated replacement, cohort survival functions
National Category
Water Engineering Infrastructure Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-75082 (URN)
Conference
9th International Conference on Sewer Processes & Networks, Aalborg Denmark, August 27-30 2019
Funder
Swedish Research Council Formas
Available from: 2019-06-27 Created: 2019-06-27 Last updated: 2019-09-20
Søberg, L., Winston, R., Viklander, M. & Blecken, G.-T. (2019). Dissolved metal adsorption capacities and fractionation in filter materials for use in stormwater bioretention facilities. Water Research X, 4, Article ID 100032.
Open this publication in new window or tab >>Dissolved metal adsorption capacities and fractionation in filter materials for use in stormwater bioretention facilities
2019 (English)In: Water Research X, ISSN 2589-9147, Vol. 4, article id 100032Article in journal (Refereed) Published
Abstract [en]

The dissolved metal adsorption and association was determined for ten different filter materials recommended and/or implemented in bioretention facilities. Batch adsorption and batch kinetic experiments were performed at lab-scale using both single and multi-metal solutions. Metal strengths and association were determined by sequential extraction analysis. All materials adsorbed metals and 90% of adsorption occurred within 1 h. However, as metal solutions became more complex, adsorption behavior changed. Generally, filter materials classified as sand with a naturally high pH, relatively low organic matter (OM) content and large specific surface area seem to be good choices for removing dissolved metals. Additionally, a chalk additive might improve metal adsorption whereas biochar did not significantly improve metal retention and may be an unwanted (due to degradation over time) extra source of OM. Regardless of filter material, metals primarily adsorbed to the exchangeable form which indicates that metal adsorption might not be permanent, but rather substantially reversible in some cases. More research is needed to assess whether dissolved metals adsorbed in filter materials of bioretention systems pose a delayed threat instead of an immediate threat. Finally, the authors strongly recommend filter materials intended for stormwater bioretention facilities to be tested prior to implementation.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Filter material, Biofilter, Heavy metals, Metal fractionation, Filter media
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-73666 (URN)10.1016/j.wroa.2019.100032 (DOI)000485181300004 ()31334495 (PubMedID)2-s2.0-85065547443 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-06-25 (johcin)

Available from: 2019-04-15 Created: 2019-04-15 Last updated: 2019-10-01Bibliographically approved
Viklander, M., Österlund, H., Müller, A., Marsalek, J. & Borris, M. (2019). Kunskapssammanställning: Dagvattenkvalitet. Svensktvatten AB
Open this publication in new window or tab >>Kunskapssammanställning: Dagvattenkvalitet
Show others...
2019 (Swedish)Report (Other (popular science, discussion, etc.))
Alternative title[en]
State of knowledge : Stormwater quality
Abstract [sv]

Rapporten sammanställer internationella forskningsresultat om källor till dagvattenföroreningar samt föroreningarnas koncentration, mängd och variation mellan platser och årstider. Den beskriver vad man bör tänka på vid utformning av provtagningsprogram och vid val av modellverktyg, och den diskuterar effekter på hälsa, miljö och samhälle samt vilka regelverk och riktlinjer som finns.

Abstract [en]

This report summarizes stormwater pollutants, their sources, concentrations, and variations in concentrations. Practical guidance for field data collection, adoption of standard data from the literature and computer modelling are given. Furthermore, the effects on health, the environment and society, and associated regulations are discussed.

Place, publisher, year, edition, pages
Svensktvatten AB, 2019. p. 82
Keywords
Micropollutants, sampling, stormwater quality models, urban drainage, Dagvatten, dagvattenkvalitetsmodeller, föroreningar, provtagning
National Category
Other Civil Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-72952 (URN)
Projects
Kunskapssammanställning: från regn till recipient – dagvattnets innehåll och dess variationer
Available from: 2019-02-19 Created: 2019-02-19 Last updated: 2019-06-10Bibliographically approved
Vijayan, A., Österlund, H., Marsalek, J. & Viklander, M. (2019). Laboratory Melting of Late-Winter Urban Snow Samples: The Magnitude and Dynamics of Releases of Heavy Metals and PAHs. Water, Air and Soil Pollution, 230(8), Article ID 182.
Open this publication in new window or tab >>Laboratory Melting of Late-Winter Urban Snow Samples: The Magnitude and Dynamics of Releases of Heavy Metals and PAHs
2019 (English)In: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 230, no 8, article id 182Article in journal (Refereed) Published
Abstract [en]

Laboratory snow melting experiments were conducted with actual late-winter snow samples, collected just before the final snowmelt, in two similar northern Swedish cities, Luleå and Umeå, to investigate releases of the selected heavy metals (HM) (Cu, Pb, Zn, and Cd) and 16 USEPA PAHs from melting snow. Metal concentrations were determined in three fractions: total, dissolved, and truly dissolved (defined as the fraction passing through a 3-kMWCO ultrafilter). Total HM concentrations in snowmelt were rather high at both sites and reflected the accumulation of pollutants in the roadside snowbanks over a period of about 5 months: Cd = 0.43, Cu = 303, Pb = 41.9, Zn = 817 (μg/l), and TSS = 2000 (mg/l) in Luleå samples and Cd = 1.87, Cu = 905, Pb = 165, Zn = 3150 (μg/l), and TSS = 4800 (mg/l) in Umeå samples. The difference between metal and TSS concentrations at the two sites of similar characteristics was attributed to a smaller volume snowbank in Umeå. The dissolved HM concentrations represented relatively small fractions of the total concentrations (0.3–6.9% in Luleå and 0.01–3.1% in Umeå). The truly dissolved fraction represented 71–90% of the dissolved fraction in Luleå and 74–98% in Umeå. At both sites, the dissolved fractions exhibited preferential elution from the laboratory snow piles. The PAHs studied (16 US EPA PAHs) were mostly particulate bound, with only 5–12% of the total burden contributed by the meltwater, and most dissolved concentrations below the reporting limits. PAH concentrations in the Luleå samples were about one-third to one-fourth of those in Umeå. In general, the releases of PAHs from the snowbank were delayed, compared with releases of meltwater, and showed similar release patterns as TSS.

Place, publisher, year, edition, pages
Springer, 2019
Keywords
PAHs, Road salt, Sediment, Snowmelt, Truly dissolved metals, Urban late-winter snow
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-75595 (URN)10.1007/s11270-019-4201-2 (DOI)000477606600002 ()2-s2.0-85069681181 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-08-20 (johcin)

Available from: 2019-08-20 Created: 2019-08-20 Last updated: 2019-09-05Bibliographically approved
Gavric, S., Larm, T., Österlund, H., Marsalek, J., Wahlsten, A. & Viklander, M. (2019). Measurement and conceptual modelling of retention of metals (Cu, Pb, Zn) in soils of three grass swales. Journal of Hydrology, 574, 1053-1061
Open this publication in new window or tab >>Measurement and conceptual modelling of retention of metals (Cu, Pb, Zn) in soils of three grass swales
Show others...
2019 (English)In: Journal of Hydrology, ISSN 0022-1694, E-ISSN 1879-2707, Vol. 574, p. 1053-1061Article in journal (Refereed) Published
Abstract [en]

Grass swales are important elements of the urban green infrastructure that convey and attenuate urban runoff and improve its quality mostly through stormwater infiltration into, and retention of conveyed pollutants by, swale soils. The retention of metals by grass swales was addressed in this study investigating the enrichment of swale soils by three common traffic-related metals: Cu, Pb and Zn. Three swales of various characteristics (L1, L2, L3) were selected for study and their soils were sampled by coring the top 30 cm and dividing the cores into 5 cm thick layers. Cumulative metal burdens were compared to those modelled by the proprietary StormTac Web model, which estimates annual loads of specific constituents for the given land uses and stormwater treatment. The comparisons of measured (MBm) and simulated (MBs) metal burdens retained by swales showed that the measured values exceed the simulated ones, as described by average ratios MBs/MBm = 0.64, 0.50 and 0.59, for swales L1, L2 and L3, respectively. The measured burdens were calculated after subtracting the native soil metal concentrations, assumed equal to those found in the deepest sampled layer, 25–30 cm below the surface. The results suggest the feasibility of assessing performance of grass swales by modelling metal (Cu, Pb, Zn) retention by swales, however for older facilities considered for rehabilitation, the simulated results should be supplemented by soil chemistry sampling.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
grass swale, heavy metals, roadside soils, planning–level modelling, metal transport
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-73936 (URN)10.1016/j.jhydrol.2019.05.002 (DOI)000476962800083 ()2-s2.0-85066065396 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-06-11 (oliekm)

Available from: 2019-05-14 Created: 2019-05-14 Last updated: 2019-08-19Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-1725-6478

Search in DiVA

Show all publications