湫水河泥沙变化及其原因分析

Analysis of the recent variation of sediment and it's reasons in Qiushuihe River

通过对湫水河林家坪水文站20世纪50年代以来径流量和输沙量的变化分析,表明20世纪70年代中期以来,湫水河的水沙关系发生了较大变化,河流泥沙呈明显减少的趋势。人类活动的方式、程度,植被破坏与恢复,水土流失治理和水利工程拦沙等是湫水河水沙变化的主要原因。

Through the variation analysis of runoff and sediment transport capacity of Qiushuihe River from 1954 to 2000, the flow-sediment relationship of the river has shown a great change since 1978. The volume of transporting sediment has shown a clear decreasing tendency. The ways and level of human activities, vegetation＇s depredation and recover, the harnessing of soil and water evosion and the sediment retention by water conservancy engineerings were the main causes for the variation of water-sediment in Qiushuihe River.