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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Three-dimensional numerical modeling of sediment flushing: case study of
Three-dimensional numerical modeling of sediment flushing: case study of
Author : TAYMAZ ESMAEILI(1), TETSUYA SUMI(2), SAMEH AHMAD KANTOUSH(3), YOJI KUBOTA(4) & STEFAN HAUN(5)
ABSTRACT
Because of the high sedimentation rate in reservoirs located across the Kurobe River in Japan (e.g. Dashidaira reservoir),
sediment flushing with full water level drawdown is used to preserve the effective storage capacity. During a flushing
operation with full drawdown, the incoming flood erodes a flushing channel into the deposited sediment. The sediment
transportation process during the flushing operation is a complex phenomenon especially in steep reservoirs due to the
dynamic interaction between the unsteady flow field and varying bed levels. In this study, the sediment flushing processes
was investigated in the steep and meandering channel of Dashidaira reservoir using a 3D numerical model. Measured
bed levels before and after the flushing operation were used for model verification purpose. A sensitivity analysis was
carried out by employing different bed load transport formulas. Outcomes showed that both Meyer-Peter-Müller and Van
Rijn’s formula have a reasonable performance to predict the bed variations in specific zones of the reservoir. It was also
found that introducing an additional inflow discharge during the free-flow condition of the flushing operation enhances the
total volume of flushed out sediment by increasing the sediment erosion mainly in the lower half of the reservoir.
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 17/08/2015
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