小凌河降雨径流变化特征分析

Analysis of Variation Characteristics of Rainfall and Runoff in Xiaolinghe River

以辽宁省西部地区小凌河流域为研究对象,选取缸窑口水文站1963—2011年的降雨径流资料,应用变差系数、极值比、距平百分率、累计滤波器、秩次相关检验、等多种统计方法,分析出了降水系列、径流系列的年际变化特征,其降水量年际变化比较激烈,丰水期历史短,而枯水期历时长;径流量亦是年际变化激烈,丰水期历时段,而枯水期历时长,总体呈现降水、径流均为减少趋势。

Taking Xiaolinghe River Basin,located in the western part of Liaoning Province,as an example,selecting the rainfall and runoff data of Gangwakou Hydrological Station from 1963 to 2011, applying variation coefficient,extreme ratio,anomaly percentage,the cumulative filter,rank correlation test etc,.Various statistic methods,yearly variation characteristics for rainfall and runoff are analyzed,in which annual precipitation change is more intense,the abundant water period is short;runoff also has intense interannual variability,high water period is short and low water period lasts long,and rainfall and runoff indicate a reducing trend on the whole.