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Publications (10 of 292) Show all publications
Abdullah, T., Ali, S., Al-Ansari, N. & Knutsson, S. (2020). Assessment of groundwater vulnerability to pollution using two different vulnerability models in Halabja-Saidsadiq Basin, Iraq. Groundwater for Sustainable Development, 10, Article ID 100276.
Open this publication in new window or tab >>Assessment of groundwater vulnerability to pollution using two different vulnerability models in Halabja-Saidsadiq Basin, Iraq
2020 (English)In: Groundwater for Sustainable Development, ISSN 2352-801X, Vol. 10, article id 100276Article in journal (Refereed) Published
Abstract [en]

Groundwater aquifer in Halabja-Saidsadiq Basin considered as 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 to evaluate 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: low, moderate, high and very high with coverage area of (2%,44%,53% and 1%), respectively. 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.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Vulnerability, VLDA, COP, Halabja-Saidsadiq basin (HSB), Iraq
National Category
Engineering and Technology Geotechnical Engineering
Research subject
Soil Mechanics; Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-76166 (URN)10.1016/j.gsd.2019.100276 (DOI)2-s2.0-85072644933 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-10-01 (johcin)

Available from: 2019-09-30 Created: 2019-09-30 Last updated: 2019-10-02Bibliographically approved
Bokde, N. D., Feijóo, A., Al-Ansari, N. & Yaseen, Z. M. (2019). A comparison between reconstruction methods for generation of synthetic time series applied to wind speed simulation. IEEE Access
Open this publication in new window or tab >>A comparison between reconstruction methods for generation of synthetic time series applied to wind speed simulation
2019 (English)In: IEEE Access, E-ISSN 2169-3536Article in journal (Refereed) Epub ahead of print
Abstract [en]

Wind energy is an attractive renewable sources and its prediction is highly essential for multiple applications. Over the literature, there are several studies have been focused on the related researches of synthetic wind speed data generation. In this research, two reconstruction methods are developed for synthetic wind speed time series generation. The modeling is constructed based on different processes including independent values generation from the known probability distribution function, rearrangement of random values and segmentation. They have been named as Rank-wise and Step-wise reconstruction methods. The proposed methods are explained with the help of a standard time series and the examination on wind speed time series collected from Galicia, the autonomous region in the northwest of Spain. Results evidenced the potential of the developed models over the state-of-the-art synthetic time series generation methods and demonstrated a successful validation using the means of mean and median wind speed values, autocorrelations, probability distribution parameters with their corresponding histograms and confusion matrix. Pros and cons of both methods are discussed comprehensively.

Place, publisher, year, edition, pages
UK: IEEE, 2019
Keywords
energy sustainability, synthetic data, time series, wind speed, wind energy.
National Category
Engineering and Technology Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-76072 (URN)10.1109/ACCESS.2019.2941826 (DOI)
Available from: 2019-09-20 Created: 2019-09-20 Last updated: 2019-09-23Bibliographically approved
Alzeyadi, A., Al-Ansari, N., Al-Rawabdeh, A. M. & Laue, J. (2019). A Novel Coating Method for Create Filter Media Capable to Remove Phosphate from Wastewater Effectively. Engineering, 11(8), 443-463
Open this publication in new window or tab >>A Novel Coating Method for Create Filter Media Capable to Remove Phosphate from Wastewater Effectively
2019 (English)In: Engineering, ISSN 1947-3931, E-ISSN 1947-394X, Vol. 11, no 8, p. 443-463Article in journal (Refereed) Published
Abstract [en]

Filtration materials coating with metallic oxides represented a good method for phosphate sorption. However, most of the researchers utilize chemicals as a source of metallic oxides and heating process to set the chemicals over the filtration materials. This study is aimed to introduce the furnace bottom ash FBA as a source of metallic oxides; it is available free because it is dumped as a waste material from power generation plants. The method of creating new filter media involves coating the limestone and sand by FBA, and the ordinary Portland cement OPC utilized as binder to binding the mixture materials. The water is the factor which is responsible for activating the OPC. All factors such as mixed materials ratio, water content and age of reaction have subjected to optimization process. The results revealed that the optimal mixture for phosphate removal consists of 40% FBA, 5% OPC from dry weight of supporting material, 35% water ratio from the total weight of FBA and OPC, and 14 days are enough to complete the materials reaction. Limestone-furnace bottom ash LFBA indicated high capacity for phosphate sorption and possibility  of  efficiency  regenerate.  This  study  demonstrates  a  new  method  for coating the filtration materials more convenient with sustainability approach.

Place, publisher, year, edition, pages
Scientific Research Publishing, 2019
Keywords
Calcium-Silicate Hydrates, FBA, Metal Oxides, Sorption, Upflow Filter, Wastewater Treatment
National Category
Engineering and Technology Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-75647 (URN)10.4236/eng.2019.118032 (DOI)
Available from: 2019-08-21 Created: 2019-08-21 Last updated: 2019-08-27Bibliographically approved
Baby, S. N., Arrowsmith, C. & Al-Ansari, N. (2019). Application of GIS for Mapping Rainwater-Harvesting Potential: Case Study Wollert, Victoria: Application of GIS for Mapping Rainwater-Harvesting Potential: Case Study Wollert, Victoria. Engineering, 11(1), 14-21
Open this publication in new window or tab >>Application of GIS for Mapping Rainwater-Harvesting Potential: Case Study Wollert, Victoria: Application of GIS for Mapping Rainwater-Harvesting Potential: Case Study Wollert, Victoria
2019 (English)In: Engineering, ISSN 1947-3931, E-ISSN 1947-394X, Vol. 11, no 1, p. 14-21Article in journal (Refereed) Published
Abstract [en]

Water is a basic normal asset for supporting the condition of life. Accessible water assets are feeling the squeeze because of expanding demand. Soon wa- ter,  which  we  have  epended  upon  to  be  accessible  and  an  unconditional present of nature will turn into a rare roduct. Protection and conservation of water assets are desperately required. In many parts of Victoria, water supply to communities is limited. Rainwater harvesting systems can provide water ator near the point of demand. The systems can be owner and utility operated and  managed.  Rainwater  collected  using  existing  structures,  i.e.  rooftops, parking lots, playgrounds, parks, ponds, floodplains etc., has few negative en- vironmental impacts compared to other technologies for water resources de- velopment. Rainwater is relatively clean and the quality is usually acceptablefor many purposes with little or even no treatment. The physical and chemi- cal properties of rainwater are usually superior to sources of groundwater that may have been subjected to contamination. The present study was intended to measure the rooftop rainwater harvesting potential using GIS techniques. The GIS examination utilized in this investigation was basically an efficient assess- ment  of  rooftop  water  collecting  in  the  chose  Wollert  which  is  a  suburb  in Melbourne, Victoria. With the use of GIS it was conceivable to appraise the ag- gregate sum of water harvestable at the household level. It is very tedious work to assess the catchments available for rooftop rainwater harvesting. Here the roof surfaces are the catchments and GIS is employed to calculate the area of various  types  of  roofs  and  their  potential  for  planning  for  the  area  under study.  As  a  result  Eucalypt  Estate  Wollert  has  huge  potential  and  can  makeabove 179.11 litres water available per person per day throughout the year.

Place, publisher, year, edition, pages
Scientific Research Publishing, 2019
Keywords
Rainwater Harvesting, Potential, Measurement, Rooftop, GIS
National Category
Engineering and Technology Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-72612 (URN)10.4236/eng.2019.111002 (DOI)
Available from: 2019-01-18 Created: 2019-01-18 Last updated: 2019-02-01Bibliographically approved
Elias, Z., Sissakian, V. K. & Al-Ansari, N. (2019). Assessment of the Tectonic Activity in Northwestern Part of the Zagros Mountains, Northeastern Iraq by Using Geomorphic Indices. Geotechnical and Geological Engineering, 37(5), 3995-4007
Open this publication in new window or tab >>Assessment of the Tectonic Activity in Northwestern Part of the Zagros Mountains, Northeastern Iraq by Using Geomorphic Indices
2019 (English)In: Geotechnical and Geological Engineering, ISSN 0960-3182, E-ISSN 1573-1529, Vol. 37, no 5, p. 3995-4007Article in journal (Refereed) Published
Abstract [en]

The Tectonic Activity of regions with active tectonics can be assessed by using of the geomorphic indices. Six Geomorphic indices including stream-gradient index (SL), drainage basin asymmetry (Af), drainage basin shape (Bs), hypsometric integral (Hi), valley floor width-valley height ratio (Vf), and mountain-front sinuosity (Smf) were calculated using GIS technique in Kifri Chai Basin; northeast Iraq, which belongs to the Western Zagros Mountain. The basin was divided into eighteen sub-basins depending on the 4th, 5th and 6th stream orders of the drainage within Kirfi Basin. It was found that the SL, Af, Bs, Hi, Vf, and Smf (J) values are uniform and exhibit almost the same classes. However, few exceptions occur, especially in Bs values, but the exceptional values do not influence significantly on the acquired results, in each of the eighteen sub-basin. From these indices the relative active tectonics index value (Iat) was determined. The results of average Iat values (2.35) showed that the tectonic activity in the whole basin is Moderate. Moreover, an attempt was carried out to compare the regional Neotectonic activity with the relative tectonic activity in the basin. The results showed that there is a positive relation between the two comparatives; especially the subsidence amount and scored relative tectonic activity.

Place, publisher, year, edition, pages
Springer, 2019
Keywords
Geomorphic indices, Tectonic activity, Neotectonic, Western Zagros, Iraq
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-73401 (URN)10.1007/s10706-019-00888-z (DOI)
Note

Validerad;2019;Nivå 2;2019-10-08 (johcin)

Available from: 2019-04-03 Created: 2019-04-03 Last updated: 2019-10-08Bibliographically approved
Adamo, N., Al-Ansari, N., Sissakian, V., Laue, J. & Knutsson, S. (2019). Badush Dam: A Unique Case of Flood WaveRetention Dams Uncertain Future and Problematic Geology. Engineering, 11(4), 189-205
Open this publication in new window or tab >>Badush Dam: A Unique Case of Flood WaveRetention Dams Uncertain Future and Problematic Geology
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2019 (English)In: Engineering, ISSN 1947-3931, E-ISSN 1947-394X, Vol. 11, no 4, p. 189-205Article in journal (Refereed) Published
Abstract [en]

Badush Dam is a partially completed dam and a unique case of flood reten- tion dams. Its intended main function is to perform flood protection once in its lifetime; that is if Mosul Dam would collapse. In such a case, the Badush dam would temporarily store the whole flood wave and route it safely to the downstream. For this end, the bulk of the reservoir is left dry, while the re- maining  volume  at  the  lower  part  which  is  intended  for  power  eneration does  not  give  an  economic  justification  for  building  the  full  height  of  the dam. The short duration of the intended use as a protection dam has led to relaxing many design assumptions which have raised concerns over the dam integrity.  The  current  controversy  rages  now  over  whether  to  continue  the construction of the dam as it was first designed or to change all that in view of the similar site geology of Mosul Dam. Mosul dam foundations suffer at the moment from the severe continuous dissolution of the soluble materials in its foundation  leading  to  continued  maintenance  grouting  of  that  foundation. This paper gives an overview of the history of Badush dam, its current design and what new equirements which are needed if it is to replace Mosul Damitself.

Place, publisher, year, edition, pages
USA: Scientific Research Publishing, 2019
Keywords
Badush Dam, Mosul Dam, Flood Retention Dam Dry Dam, Foundation
National Category
Engineering and Technology Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-73608 (URN)10.4236/eng.2019.114014 (DOI)
Available from: 2019-04-12 Created: 2019-04-12 Last updated: 2019-04-15Bibliographically approved
Hashim, B. M., Sultan, M. A., Attyia, M. N., Al Maliki, A. A. & Al-Ansari, N. (2019). Change Detection and Impact of Climate Changes to Iraqi Southern Marshes Using Landsat 2 MSS, Landsat 8 OLI and Sentinel 2 MSI Data and GIS Applications. Applied Sciences, 9(10), Article ID 2016.
Open this publication in new window or tab >>Change Detection and Impact of Climate Changes to Iraqi Southern Marshes Using Landsat 2 MSS, Landsat 8 OLI and Sentinel 2 MSI Data and GIS Applications
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2019 (English)In: Applied Sciences, E-ISSN 2076-3417, Vol. 9, no 10, article id 2016Article in journal (Refereed) Published
Abstract [en]

Marshes represent a unique ecosystem covering a large area of southern Iraq. In a major environmental disaster, the marshes of Iraq were drained, especially during the 1990s. Since then, droughts and the decrease in water imports from the Tigris and Euphrates rivers from Turkey and Iran have prevented them from regaining their former extent. The aim of this research is to extract the values of the normalized dierence vegetation index (NDVI) for the period 1977–2017 from Landsat 2 MSS (multispectral scanner), Landsat 8 OLI (operational land imager) and Sentinel 2 MSI (multi-spectral imaging mission) satellite images and use supervised classification to quantify land and water cover change. The results from the two satellites (Landsat 2 and Landsat 8) are compared with Sentinel 2 to determine the best tool for detecting changes in land and water cover. We also assess the potential impacts of climate change through the study of the annual average maximum temperature and recipitation in dierent areas in the marshes for the period 1981–2016. The NDVI analysis and image classification showed the degradation of vegetation and water bodies in the marshes, as vast areas of natural vegetation and agricultural lands disappeared and were replaced with barren areas. The marshes were influenced by climatic change, including rising emperature and the diminishing amount of precipitation during 1981–2016.

Place, publisher, year, edition, pages
Switzerland: MDPI, 2019
Keywords
Iraqi marshes, climate change, satellites data
National Category
Engineering and Technology Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-73970 (URN)10.3390/app9102016 (DOI)000473748100051 ()2-s2.0-85066468463 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-05-29 (oliekm)

Available from: 2019-05-16 Created: 2019-05-16 Last updated: 2019-08-19Bibliographically approved
Al-Mamoori, S. K., Al-Maliki, L. A. J., El-Tawel, K., Hussain, H. M., Al-Ansari, N. & Al Ali, M. J. (2019). Chloride, Calcium Carbonate and Total Soluble Salts Contents Distribution for An-Najaf and Al-Kufa Cities’ Soil by Using GIS. Geotechnical and Geological Engineering, 37(3), 2207-2225
Open this publication in new window or tab >>Chloride, Calcium Carbonate and Total Soluble Salts Contents Distribution for An-Najaf and Al-Kufa Cities’ Soil by Using GIS
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2019 (English)In: Geotechnical and Geological Engineering, ISSN 0960-3182, E-ISSN 1573-1529, Vol. 37, no 3, p. 2207-2225Article in journal (Refereed) Published
Abstract [en]

The main objective of the paper is to create geotechnical maps for three soil chemical properties in An-Najaf and Kufa cities’ soil by utilizing of GIS tools. This properties are the chloride concentration, calcium carbonate (CaCO 3) and total soluble salts where they affect the durability of reinforced structural elements. This paper provides an easy accurate way to represent soil properties levels for different depths of soil and create reliable database that will help engineers and decision makers. The data included in this paper were collected for (464) boreholes with depths up to 35 m distributed on residential areas in all of An-Najaf and Kufa cities. Arc-Map of GIS 10.2.1 was used to produce the maps. It has been concluded that chloride content in the soil of the study area range from - 0.01 to 0.99% and with an average of 0.5. The maximum value found in at depth 4–6 m while the minimum value found in location at depth 4–6, 8–10 and 14–16 m. The chloride content in most of An-Najaf province has exceeded the permissible limit and for all, this required taking percussions to protect foundations. While calcium carbonate content in the soil of the study area range from 53 to 0.18 and with an average of 26.6. The maximum and the minimum values found at depth 4–6 m. Calcium carbonate content is within the permissible limits in most locations except in some locations.

Place, publisher, year, edition, pages
Springer, 2019
Keywords
Chloride content, GIS, Calcium carbonate (CaCO3), Total soluble salts (TSS), An-Najaf and Kufa cities, Geotechnical maps, Reinforced concrete
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-71827 (URN)10.1007/s10706-018-0754-x (DOI)000465591800076 ()2-s2.0-85057590413 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-06-10 (oliekm)

Available from: 2018-11-30 Created: 2018-11-30 Last updated: 2019-06-10Bibliographically approved
Tajbakhsh, M. & Al-Ansari, N. (2019). Comparative study of multi-station method and Hershfield’s approaches for PMP determination (case study: Northeast of Iran). Sustainable Water Resources Management, 5(3), 1133-1141
Open this publication in new window or tab >>Comparative study of multi-station method and Hershfield’s approaches for PMP determination (case study: Northeast of Iran)
2019 (English)In: Sustainable Water Resources Management, ISSN 2363-5037, Vol. 5, no 3, p. 1133-1141Article in journal (Refereed) Published
Abstract [en]

The maximum daily rainfall values for 36 homogeneous stations in the northeast of Iran were adopted to estimate the appropriate Probable annual Maximum Precipitation 1-day precipitation (PMP24) values. PMP24 was found as 128.2–284.2, 62.7–160.2 and 124 mm for Hershfield 1, Hershfield 2 and multi-station approach, respectively. The ratio of PMP24 to the highest observed 1-day rainfall was consistent for the second approach of Hershfield. It was in harmony with the multi-station method, but varied widely for Hershfield 1. This may be the result of different record length effect on Hershfield 1 approach. Finally, the map of PMP24 isochrones was prepared for the second approach of Hershfield for over northeast of Iran.

Place, publisher, year, edition, pages
Springer, 2019
Keywords
Probable maximum precipitation Hershfield Multi-station Northeast of Iran
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-71153 (URN)10.1007/s40899-018-0291-z (DOI)000483828800012 ()
Note

Validerad;2019;Nivå 2;2019-09-24 (johcin)

Available from: 2018-10-09 Created: 2018-10-09 Last updated: 2019-09-24Bibliographically approved
Tayebiyan, A., Mohammad, T. A., Al-Ansari, N. & Malakootian, M. (2019). Comparison of Optimal Hedging Policies forHydropower Reservoir System Operation. Water, 11(1), Article ID 121.
Open this publication in new window or tab >>Comparison of Optimal Hedging Policies forHydropower Reservoir System Operation
2019 (English)In: Water, ISSN 2073-4441, E-ISSN 2073-4441, Vol. 11, no 1, article id 121Article in journal (Refereed) Published
Abstract [en]

Reservoiroperation rules play an important role in regions economic development. Meanwhile, hedging policies are mostly applied for municipal, industrial, and irrigation water supplies from reservoirs and it is less used for reservoir operation for hydropower generation. The concept of hedging and rationing factors can be used to maintain the water in a reservoir for the sake of increasing water storage and water head for future use. However, water storage and head are the key factors in operation of reservoir systems for hydropower generation. This study investigates the applicability of seven competing hedging policies including four customary forms of hedging (1PHP, 2PHP, 3PHP, DHP) and three new forms of hedging rules (SOPHP, BSOPHP, SHPHP) for reservoir operation for hydropower generation. The models were constructed in MATLABR2011b based on the characteristics of the Batang Padang hydropower reservoir system, Malaysia. In order to maximize the output of power generation in operational periods (2003–2009), three optimization algorithms namely particle swarm optimization (PSO), genetic algorithm (GA), and hybrid PSO-GA were linked to one of the constructed model (1PHP as a test) to find the most effective algorithm. Since the results demonstrated the superiority of the hybrid PSO-GA algorithm compared to either PSO or GA, the hybrid PSO-GA were linked to each constructed model in order to find the optimal decision variables of each model. The proposed methodology was validated using monthly data from 2010–2012. The results showed that there are no significant difference between the output of monthly mean power generation during 2003–2009 and 2010–2012. The results declared that by applying the proposed policies, the output of power generation could increase by 13% with respect to the historical management. Moreover, the discrepancies between mean power generations from highest to lowest months were reduced from 49 MW to 26 MW, which is almost half. This means that hedging policies could efficiently distribute the water-supply and power-supply in the operational period and increase the stability of the system. Among the studied hedging policies, SHPHP is the most convenient policy for hydropower reservoir operation and gave the best result.

Place, publisher, year, edition, pages
Switzerland: MDPI, 2019
Keywords
hedging policies, hydropower, reservoir system, operation, optimization, hybrid PSO-GA
National Category
Engineering and Technology Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-72515 (URN)10.3390/w11010121 (DOI)000459735100119 ()2-s2.0-85059860442 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-01-25 (svasva)

Available from: 2019-01-10 Created: 2019-01-10 Last updated: 2019-09-13Bibliographically approved
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