基于高程修正的降雨量对径流系数成果影响分析——以大容山高垌水库为例

Analysis of the impact of rainfall on runoff coefficient results based on elevation correction

建设在小流域上的水库,由于其流域范围内通常缺乏足够的测站,在简化计算的情况下通常以水库站实测降雨作为流域面降雨或采用降雨等值线成果来进行计算。该方法对于水库站所在高程与流域平均高程相差不大的情况下,或不处于暴雨中心的情况下,通常是十分有效的;但对于山区水库,尤其是处于暴雨中心的水库,该方法往往会忽略高程、迎风坡的影响,或者读取的降雨值偏小,最终导致计算出来的径流成果偏离实际情况。因此本次分别采用泰森多边形法、建立高程与降雨量相关关系来分析高程变化对于山区水库径流系数分析成果的影响。从而为更科学的利用水资源提供依据。

For a reservoir constructed in a small watershed,due to lack of sufficient measurement station within the watershed range,simplified calculation was usually conducted with the rainfall measured at the reservoir station be⁃ing used as the watershed surface rainfall or by use of the rainfall contour results.This method is usually very effec⁃tive when the elevation of the reservoir station is not much different from the average elevation of the basin,or when it is not in the center of the rainstorm.However,for the reservoirs in mountainous areas,especially those in the cen⁃ter of rainstorm,the impact of elevation and windward slope is often ignored by this method,or the rainfall value read is too small,which ultimately leads to the deviation of the calculated runoff results from the actual situation.Therefore,Tyson polygon method was used to establish a correlation between elevation and rainfall to analyze the impact of elevation changes on the analysis results of runoff coefficient of mountain reservoirs,so as to provide basis for more scientific utilization of water resources.