The Application of Two Dimensional Hydraulic and Sediment Transport Modelling in Dam Removal Simulations
Date Issued
2012
Date
2012
Author(s)
Lee, Wen-Shien
Abstract
The decision of dam removal need to carefully evaluate of the response of river from many perspectives.Among different issues of dam removal,one of the most challenging and critical concern is how to accommodate or offset the potential short-term impacts associated with the release of stored sediment.Utilizing one-dimensional hydraulic and sediment transport model to simulate the response after dam removal is common and widely accepted .However,it is highly limited in the model assumption and capacity and not able to provide a comprehensive analysis of channel evolution.For this concern,this study makes effort to evaluate to possibility of application of two-dimensional hydraulic and sediment model in dam removal simulations.This study applies a two dimensional model,CCHE2D,and take Barlin Dam Break and the removal of Qijiawan River Dam as case study.By comparing the simulation result from CCHE2D and NETSTARS,another one-dimensional model,this study pays attention to investigate the model capacity to describe two-dimensional hydraulic and sediment transport characteristics such as head cutting and knickpoint mitigration,secondary current flow,and channelization in different in different river section.In addition,two-dimensional Habitat Suitability Index(HSI) map is construced according to the model result and used to discuss the change of habitats under different discharge.
Subjects
Dam break
Dam removal
Two-dimensional hydraulic and sediment transport simulation
secondary flow
knickpoint mitigation
habitat fitness
Type
thesis
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