Estimate the Sediment Load Entering the Left Side of Mosul Dam Lake Using Four Methods

Abstract

Mosul Dam is one of the important dams in Iraq, it suffers like other dams from the problem of sediment accumulation in the lake. The daily surface runoff was estimated from seven main valleys in the left bank of the lake during the period (1/1/1988-31/8/2016) by applying SWAT model. The model performance was assessed using the statistical criteria R², IOA, NSE and T-Test, the results were good. The averages annual surface runoff from the main valleys to the lake ranged between 3.3*10⁶ m³ to 42.1*10⁶ m³. The daily sediment load was estimated by four methods, Bagnold method was used in SWAT sediments transport simulation, while Yang, Toffaletti methods and Excess Shear Theory were programed by MATLAB, The performance of sediments transport simulation using Bagnlod, Yang and  Excess Shear Theory methods was assessed using the same four statistical criteria and  the results were good,  The averages annual sediment load from the main valleys to the lake were (5.78*10³ - 68.62*10³), (1.49*10⁴ - 42.13*10⁴), (8.46*10³ - 160.77*10³) and (4.26*10⁴ - 78.6*10⁴) tons for Bagnold, Yang, Excess Shear Theory and Toffaletti methods, respectively. The valley Jardiam is the main supplier of sediments to the left side of the dam lake with 56%.

Keywords

• Mosul Dam Lake,SWAT Model,Sediment Load,Left Side Valleys

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