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標題: 簡易一維土石流型堰塞湖潰決演算及運動波洪水傳遞模型:以荖濃溪為例
Simple One-Dimensional Dam Breach and Flood Route Models for Tributary-Dammed Lake: A Case Study of the Laonong River in Southern Taiwan
作者: 陳慈愔
Tzu-Yin Chen
Chi-Yao Hung
關鍵字: 堰塞湖;蒙地卡羅法;潰壩模式;運動波輸送理論;tributary-dammed lake;breaching model;kinematic wave model
Project: 中華水土保持學報, Volume 50, Issue 4, Page(s) 131-142

Due to numerous landslides caused by Typhoon Morakot in 2009, much loose sediment was deposited in the upper reach of the tributary of Laonong River. Loose material was transported into the main stream during the heavy rainfall of the typhoon and formed a tributary-dammed lake. If the dam were to fail, this would pose a significant threat to downstream villages. In this research, we present a diffusion equation-based one-dimensional semianalytical model of a tributary-dammed lake breach. To estimate the most dangerous scenario, the model incorporates the intense discharge caused by torrential precipitation during typhoons. To assess the security of downstream villages, the floods are routed by a one-dimensional kinematic wave solution for a nonuniform valley. The solution can simulate areas impacted by flooding with much reduced computational cost and topographical data requirements. Finally, the research applies combined methods to the tributary-dammed lake at the confluence of the Putunpunas tributary river with the Laonong River. The maximum flood elevation of the dam was estimated for breach floods under different scenarios.
Appears in Collections:第50卷 第04期

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