Numerical Analysis of River Bed Change Due to Reservoir Failure Using CCHE1D Model

Title & Authors
Numerical Analysis of River Bed Change Due to Reservoir Failure Using CCHE1D Model
Son, In Ho; Kim, Byunghyun; Son, Ah Long; Han, Kun Yeun;

Abstract
This study presents the analysis of flood and bed deformation caused by reservoir failure. The CCHE1D is used to simulate 1D non-uniform, non-equilibrium sediment transport and bed deformation. The CCHE1D deals with the adaptation length for non-equilibrium sediment, classified sediment particle for non-uniform sediment and mixing layer for the exchange with the sediment moving with the flow. The model is applied to Ha!Ha! river basin where was experienced reservoir failure in 1996 to analyze non-uniform and non-equilibrium sediment transport. The calculations are compared with morphological bed changes of pre- and post-flood. In addition, model sensitivity to main parameters involving adaptation length ($\small{L_{s,b}}$), non-equilibrium coefficient ($\small{{\alpha}_s}$), mixing layer thickness ($\small{{\delta}_m}$) and porosity (p`) is analyzed. The results indicates that thalweg change is the most sensitive to non-equilibrium coefficient ($\small{{\alpha}_s}$) among those parameters in the study area.
Keywords
CCHE1D;Reservoir failure;Bed change;Non-uniform sediment;Non-equilibrium sediment transport;
Language
Korean
Cited by
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