基于溃坝时间估计的洪水路径模拟

S. Jang, Sun Jung
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引用次数: 0

摘要

延川大坝建于1985年5月的韩国汉滩江。它最初是为了用混凝土和部分泥土建造的小型水力发电而建造的。地处汉滩河中游,具有丘陵地形特征。因此,该水库具有截留时间短、库容小的顺流型水库。延川大坝于1999年8月1日因特大暴雨而被毁,溃坝导致下游地区形成坝址。但是由于发生在黎明,没有准确的故障时间和持续时间的信息和记录,所以公众的争论一直持续到现在。本研究为预测溃坝时间,建立了径流模型、决口模型和溃坝路径模型为非耦合型的仿真模型。预测溃坝时间的非耦合模型包括坝址径流量的HEC-HMS模型,溃坝部分流量的FLDWAV模型的DAMBRK模块,以及大坝下游河段洪水走向的HEC-RAS模型的非稳态模拟模型。模拟结果表明,坝段峰值径流量为10324 m3/s,总径流量为12.64亿m3,峰值时间为1999年8月1日5时00分。其中4天总降雨量861.9mm,峰值径流量10324 m3/秒超过了汉滩河200年设计回潮期。模拟的含闸门溢流的坝峰流量为12054.8 m3/s,溃坝时间为8月1日02:45 ~ 03:10,通过对观测水面阶段的模拟结果进行比较,确定溃坝时间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Flood routing simulation for dam failure time estimation
Yeon-Cheon dam was built in Han-Tan river in south Korea in May 1985. It was originally constructed for the purpose of small hydro power made by concrete and partly earth. And it was located cross the mid stream of Han-Tan river having hilly topographic characteristic. Therefore it has run-of-river type reservoir with very short detention time and small storage volume. Yeon-Cheon dam was destroyed in 1st Aug. 1999 due to extremely heavy rain, and the dam failure yielded the disaster downstream area form dam site. But there is no accurate information and records about failure time and duration because it happened in the early dawn, so the public arguments are growing up to now. This case study is to predict the dam failure time and simulation model is established as an un-coupled type which are runoff model, dam breach model and flood routing model. The uncoupled model for prediction dam failure time include HEC-HMS model for runoff rate at dam site, DAMBRK module of FLDWAV model for flow rate through dam failure part, and unsteady simulation model called of HEC-RAS model for flood routing in the downstream reach from dam. Simulation results show that peak runoff rate at dam is 10,324 m3/sec total runoff volume is 1,264million m3 and peak time is 05:00 1st Aug. 1999. Where total rainfall during 4 days is 861.9mm and peak runoff rate of 10,324 m3/sec is exceeding in the design return period of 200 years of Han-Tan river. Also the simulated peak discharge through dam including gate over flowed is 12,054.8 m3/sec and dam failure time is estimated at 02:45 until 03:10 1st Aug. Dam failure time can be determined by comparing the simulated results of observed water surface stage.
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