2004年10月出石川破堤氾濫における洪水の被害調査と氾濫流解析に基づく検討
キーワード:
dyke break,
sediment transport,
CIP-CSL2 scheme,
boundary condition,
shallow-water flow,
numerical analysis
2007 年 13 巻 p. 303-308
詳細
2007 年 13 巻 p. 303-308
Recently, we have been severely damaged by dyke breaks of rivers due to typhoons or local heavy rains. In order to evaluate the flood damage by dyke breaks, it is important to consider flood flow and sediment transport at the same time especially for steep rivers that carry much suspended sediment. We develop a numerical method for flow and sediment transport on flood plains, which employs an explicit and conservative CIP scheme based on the control volume approach to directly capture the various conditions on the flood plains. The numerical method is applied to the actual dyke break occurred in October 2004 in Izushigawa River. The method is validated through the comparison between the numerical results and questionnaire results for house damages.
