手把岩水库暴雨洪水特性及设计洪水计算分析

Rainstorm and Flood Characteristics Analysis and Design Flood Calculation of Shoubayan Reservoir

针对孙家沟山区雨源型小流域的水文特性,在充分考虑手把岩水库坝址以上集水区间对设计洪水影响的基础上,以邻近黔西气象站62年实测降水资料为基准,结合周边沙厂雨量站等降水参证站,采用雨洪法及闭流区计算方法,对流域暴雨洪水特性进行研究。结果表明,水库坝址处设计洪水研究成果与历史调查洪水相差不大,与流域暴雨洪水特性匹配性高,合理可靠。雨洪法及闭流区计算方法推求的洪水成果,既能为本工程设计方案优化提供数据支撑,也可为其他无实测资料山区小流域合理开发利用提供参考。

According to the hydrological characteristics with mountain rain source small watershed basin of Sunjiagou river,and fully considering the design flood impact of catchment area above dam site of Shoubayan reservoir,the rain flood method and closed flow area calculation method have been adopted to analyze the rainstorm flood characteristics based on the 62 years precipitation data of adjacent Qianxi meteorological station and the precipitation reference station such as Shachang rainfall station.The demonstration results show that the design flood analysis results at the reservoir dam site have little difference with the historical survey flood and have highly matched with the rainstorm flood characteristics of the basin,which is reasonable and reliable.The flood results calculated by rain flood method can not only provide data supports for engineering design scheme optimization,but also provide reference for small watershed reasonable development planning in mountainous areas without actual measured data.