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A numerical study of pumping effects on flow velocity distributions in Mosul Dam reservoir using the HEC‐RAS model
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-6790-2653
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-1365-8552
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0003-1935-1743
2020 (English)In: Lakes & Reservoirs: Research and Management, ISSN 1320-5331, E-ISSN 1440-1770Article in journal (Refereed) Epub ahead of print
Abstract [en]

Water flow direction and velocity affect and controls erosion, transport and deposi- tion of sediment in rivers, reservoirs and different hydraulic structures. One of the main structures affected is pumping stations within the dams wherein the velocity distribution near the station intake is disturbed. The two-dimensional (2-D) HEC-RAS 5.01 model was utilized to study, analyse and evaluate the effects of pumping rates and flow depth on the flow velocity distribution, flow stream power and their effects in the Mosul Dam reservoir. The pumping station was considered as a case study. The station is suffering from sediment accumulation around, and in, its intake and suction pipes. The main inflow sources to the reservoir are the Tigris River and run-off from the valleys within its basin. The reservoir was divided into two parts for the present study, including the upper part near the pumping station (analysed as a two-dimen- sional zone), while the lower part was analysed as a one-dimensional flow to reduce the simulation period computation time (1986–2011). Different operation plans (i.e. pumping rate and water depth) were considered. The results of the depth-averaged velocity model indicated that when the pumping station was working at a range from the designed full capacity (100% to 25% of its full capacity), the maximum flow ve- locity increased from 75 to 4 times the normal velocity when there is no pumping dependent on pumping rate and flow depth. For the same operation plans, the flow stream power varied from around zero values to 400 times at full pumping capacity and low flow depth. For sediment routing along the reservoir, the considered statisti- cal criteria indicated the model performance in estimating the total sediment load deposition and invert bed level is much better than in the case of erosion and deposition areas for different considered bed sections of the reservoir.

Place, publisher, year, edition, pages
USA: John Wiley & Sons, 2020.
Keywords [en]
pumping station, sediment concentration, stream power, velocity distribution
National Category
Geotechnical Engineering
Research subject
Soil Mechanics; Soil Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-77542DOI: 10.1111/lre.12306OAI: oai:DiVA.org:ltu-77542DiVA, id: diva2:1389138
Available from: 2020-01-29 Created: 2020-01-29 Last updated: 2020-02-04

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Al-Ansari, NadhirKnutsson, SvenLaue, Jan

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