乐昌峡水利枢纽对武江径流的影响初探

Analysis of Wujiang River Runoff under Impact of Lechangxia Water Control Project

乐昌峡水利枢纽为不完全年调节水电站,采取兴利库容与防洪库容相结合的方式运行,汛期防洪限制水位144.5m,10月初回蓄至正常蓄水位154.5m,至翌年汛期前水库回落至死水位141.5m。工程运行后对武江的水文情势产生一定影响,水库形成使库区流速较建库前变缓;坝址下泄流量丰水期减少,枯水期增多,对减少武江汛期洪水灾害和提高枯水期的水量保证程度有积极作用。

Lechangxia Water Control Project,as a seasonal regulating hydropower station,was designed to be operated under the rules of the beneficial reservoir capacity and flood control capacity.Its designed flood control level is 144.5m in flood seasons while the water level will rise to 154.5m in early October each year and drop to the dead water level before the flood season next year.After the operation of Lechangxia project,the water regime of Wujiang River will be diverted from the natural way.The water will flow more slowly in the reservoir area while the water discharge at the dam site will decrease in flood seasons and increase in dry seasons.Generally,Lechangxia project will benefit Wujiang River on the flood prevention capacity and the assurance for water quantity in dry seasons.