Flood Risk Analysis for the Landslide Lake of Hongshiyan
Abstract: When great landslide lake was formed at Hongshiyan in Niunan River, the hydrometeorological data and engineering design data of landslide lake area were collected rapidly. Through analysis to flood proba-bility, flood standard, design flood peak flow and the flood volume in designing period, the analysis and calculation results of the flood were provided timely to dispose the risk at Landslide Lake. The results indicated the probability of annual maximum flood in this landslide lake was larger in August and Sep-tember, which was about 35%. The flood routing on the flood of every 5 years and 20 years was carried out by the water balance equation to analyze the highest flood level and the largest capacity of the lake. The results showed that there were 6 design capacities in 1 day, 3 days, 5 days and 7 days were larger than the maximum capacity of the landslide lake, the frequency of overflowing weir was about 75%. The risk area is great through risk analysis to submergence and breach when flood overflows cofferdam, 4213 people and 6 hydropower stations alone the upstream and downstream of 83 km landslide river reach may be affected by submergence and weir break. Therefore, risk-elimination is urgent for the land- slide lake of Hongshiyan.
文章引用: 任继周 , 赵 伟 (2015) 红石岩堰塞湖洪水风险分析。 水资源研究， 4， 290-295. doi: 10.12677/JWRR.2015.43035
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