渭河下游水沙变化趋势分析

本文通过对近6年渭河下游水沙量数据的统计和分析得出,渭河下游河段年内多沙期较河流主汛期有所提前;年径流量和年输沙量的变化趋势基本一致,而且自60年代至2005年华县站的水沙量持续呈递减趋势;河流的冲淤情况与该河段的降雨量有着直接的关系,当年平均降雨量小的时候河流以淤积为主,当年平均降雨量大的时候河流以冲蚀为主。针对这些特征,分析了渭河下游目前存在的主要问题。

Analysis on the Runoff and Sand Folw in the Downstream of Weihe in Recent Years

Through the statistics and analysis of runoff and amount of sand lost in the downstream of Weihe in recent years,it is discovered that in the downstream of Weihe the magnitude sand season was ahead of the main flood season relatively within the year;Variation tendency of annual runoff and amount of sand lost was identical basically,and the quantity of water and sand at Huaxian gauging station was tailing-off continuously from the 1960's to 2005;There was direct relation between the situation of rushing or silting deposits and rainfall at this section of the river:The river depositing in the year which is rich rainfall,the eroding in the poor rainfall.According to these characteristics,the problems of Weihe were analyzed.