洮河水电梯级开发对径流的影响分析

Analysis on Influence of Multi-Stage Water Power Development to the Runoff of Taohe River

以洮河干流站流量资料为依据,研究了水电站建设前上、下游站年径流量序列关系和年内变化的对应规律,进而对水电站建设后径流的变化情况进行了分析。结果表明:洮河水电梯级开发使得进入下游河道的水量不断减小,上、下游站的年径流关系发生了较大变化;汛期径流量所占比重相对减小,非汛期径流量所占比重相对增加,年内变化趋向均一;九甸峡水利枢纽的兴建极大地改变了下游河道的流量过程,对径流的影响较大。

The paper studies the serial relations of annual runoff and laws of correspondence of variations within a year of stations on the upper stream and downstream before building a hydroelectric power plant according to the discharge data of stations located on the main Taohe River and analyzes the variations of runoff after building the hydroelectric power plant.The outcomes show that a) the cascade development of the river has made the flow into the lower channel smaller continuously and the annual runoff relations of upper stream and downstream stations changed greatly;b) the proportion of runoff in flood season is relatively smaller and relatively greater in non-flood season and the variation within a year tends to uniform;c) the building of Jiudianxia key water control project has greatly changed the discharge of downstream channel and the influence to the runoff is greater.