清流河流域场次暴雨洪水特征及其对降水的响应关系

暴雨洪水是主要的自然灾害,分析暴雨洪水特性及其与气候要素的响应关系对流域防洪减灾和水资源可持续利用等方面具有重要意义。根据清流河流域102场暴雨洪水资料,系统分析了场次暴雨洪水过程特征、径流组成以及洪水特征要素与降水指标之间的响应关系。结果表明:场次降雨特征在一定程度上决定了洪水过程变化,水利工程修建和下垫面变化等人类活动对暴雨洪水过程特征有一定影响;场次暴雨洪水的产流系数总体具有递减趋势,但地表径流占径流总量的比率有增大趋势;场次径流量及洪峰流量与场次降水量之间具有较好的相关性,雨强对清流河流域暴雨洪水特征影响相对较小,蓄满产流是清流河流域主要的产流机制。

Characteristics of storm floods and its responses to precipitation indices for the Qingliu River catchment

Storm flood is one of the natural disasters occurred frequently. It is of great significance to flood mitigation and sustainable utilization of water resources to investigate characteristics of storm flood at catchment scale and its responses to change in climatic factors. According to recorded data of 102 storm floods in Qingliu River catchment, it analyzed the characteristics of storm floods, runoff components, and the response relation between the precipitation feature and index. Results show that flood process are dominated by rainfall pattern. The human activities such as construction of engineering and land use change, etc have certain influence on process characteristics of storm floods.Runoff coefficients of storm flood tend to decrease in general,while the proportion of surface runoff to total storm runoff presents an increasing trend.Total runoff and peak discharges of storm floods highly correlated to storm rainfall,while the rainfall intensity has less impact on the characteristics of storm flood.The saturation runoff is the dominant mechanism of Qingliu River catchment.