一、统计相关法求算大中河流设计流量的依据 根据径流成因,影响洪峰流量的主要因素是:流域的水文气象特征、流域几何特征和自然地理特征。对大中河流来说,对洪峰流量起控制作用的是量大和历时长的暴雨;流域形状和流域主河槽坡度则影响汇流。因此,结合流域的自然地理特征,通过统计分析,可以建立洪峰流量与气象、流域特征间的相关关系,即: I. Statistical Correlation Method Basis for Calculating Design Flow of Large and Medium Rivers According to the causes of runoff, the main factors that affect the flood peak flow are: Hydrological and meteorological characteristics, basin geometry and natural geography. For large and medium-sized rivers, the control of peak flow is heavy and prolonged rainstorm; catchment shape and river basin slope affect convergence. Therefore, in combination with the natural geographical features of the river basin, through statistical analysis, the correlation between peak flow and meteorological and river basin characteristics can be established: