Premium
Sediment in Mosul Dam reservoir using the HEC ‐ RAS model
Author(s) -
Mohammad Mohammad E.,
AlAnsari Nadhir,
Issa Issa E.,
Knutsson Sven
Publication year - 2016
Publication title -
lakes and reservoirs: research and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.296
H-Index - 39
eISSN - 1440-1770
pISSN - 1320-5331
DOI - 10.1111/lre.12142
Subject(s) - sediment , sedimentation , hydrology (agriculture) , inflow , sedimentary budget , geology , bathymetry , routing (electronic design automation) , sediment transport , environmental science , geomorphology , geotechnical engineering , oceanography , computer network , computer science
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 r 2 = 0.87) and sediment routing based on bed level, (with resultant r 2 = 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 km 3 , a value that is very close to the measured values (1.143 km 3 ) 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.