纵向岭谷区小流域设计洪水计算中变雨强汇流参数探讨

Probe into Change Rainstorm Conflux Coefficient of Small Valley Design Flood Computation in LRGR

基于洪水汇流参数随主净雨强度呈一定变化规律的特点,从流域汇流系统理论方法入手,推导汇流参数与主净雨强度的关系,以此作为外延设计条件下洪水汇流参数的依据。根据实际暴雨、洪水资料分析其定量关系,并用实际洪水样本进行检验,结果表明,用此法推求的设计洪水具有一定精度,由暴雨推求设计洪水时考虑变雨强汇流参数符合实际。

Based on the change rule between flood conflux coefficient and main rainstorm intensity,according to watershed conflux system theory,the author reasons out and analyzes the relationship between flood conflux coefficient and main rainstorm intensity through the observed rainstorm and flood data in LRGR.The flood sample series test indicates that the method in the paper is highly precise,and shows that computation design flood procedure through the way that thinking about vary rainstorm conflux intensity is correct.Thus,the new method can be used for reference in small valley design flood computation in which the hydrological observed data is short.