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Three-Dimensional Morphodynamic Modelling of TigrisRiver in Baghdad
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering. College of Engineering, Unive rsity of Baghdad.ORCID iD: 0000-0002-5670-7254
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-6790-2653
College of Science, University of Baghdad.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-1365-8552
2017 (English)In: Journal of Civil Engineering and Architecture, ISSN 1934-7359, E-ISSN 1934-7367, Vol. 11, no 6, p. 571-594Article in journal (Refereed) Published
Abstract [en]

Bathymetric and land surveys were conducted for the northern Tigris River reach (18 km length) in Baghdad, producing 180cross sections. A river bed topography map was constructed from these cross sections. The velocity profiles and the water discharges were measured using ADCP (Acoustic Doppler Current Profiler) at 16 cross sections, where intensive number of sediment samples was collected to determine riverbed characteristics and sediment transport rate. The three-dimensional morphodynamic model (SSIIM (simulation of sediment movements in water intakes with multiblock option)) was used to simulate the velocity field and the water surface profile along the river reach. The model was calibrated for the water levels, the velocity profiles and the sediment concentration profiles using different combinations of parameters and algorithms. The calibration and the validation results showed good agreement with field measurements, and the model was used to predict the future changes in river hydro-morphology for a period of 14 months. The results of the future predictions showed the Tigris River which behaved like an under-fit river, increases in depositions on the shallow part of the cross section having lower velocity, and the river deepens the incised route to fit its current hydrologic condition leaving the former wide section as a floodplain for the newer river. The net deposition/erosion rate was 67.44 kg/s in average and the total deposition quantity was 2.12 million ton annually. An expansion in the size of current islands was predicted. An indication of thepotential threats of the river banks’ collapse and the bridge piers’ instability was given by high erosion along the thalweg line.

Place, publisher, year, edition, pages
David Publishing Company, 2017. Vol. 11, no 6, p. 571-594
National Category
Engineering and Technology Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-65660DOI: 10.17265/1934-7359/2017.06.005OAI: oai:DiVA.org:ltu-65660DiVA, id: diva2:1141599
Note

Validerad;2017;Nivå 1;2017-10-03 (andbra)

Available from: 2017-09-15 Created: 2017-09-15 Last updated: 2018-04-19Bibliographically approved

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Ali, AmmarAl-Ansari, NadhirKnutsson, Sven

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