摘要
本文着重分析了近十年渭河下游水沙变化的情况。指出近十年渭河下游水量、沙量的减少主要是渭河咸阳以上干流大流量级水量、沙量的减少造成的，水量减少的幅度远大于沙量的减少幅度。分析表明：小流量级水量的减少与对应沙量的增加，使得高含沙小洪水发生的机会增加。不利的水沙条件是渭河下游主槽严重萎缩、平滩流量急剧下降、洪水位陡涨的重要原因。
Based on the field data of runoff and sediment of the lower Weihe River in the period of 1950～1996,variations of runoff and sediment load are analyzed. It shows that in last ten years the decrease of runoff and sediment load in the lower Weihe River was due to the decrease of runoff and sediment load corresponding to the large discharge in the main stream above Xianyang,the amount of the decrease of runoff was larger than that of sediment, and the reduction of runoff and the increment of sediment correspoding to smaller discharge led to increase the occurrence of hyperconcentrated floods. The unfavorable conditions of water and sediment load are the important factors that cause seriously the withering of main channel,the rapid dropping down of formative discharge, and the sharp rising of flood stages in the lower Weihe River in recent years.
出处
《泥沙研究》
CSCD
北大核心
1999年第3期17-25,共9页
Journal of Sediment Research
关键词
水沙特性
高含沙洪水
冲淤规律
渭河下游
The Lower Weihe River, hyperconcentrated floods, characteristics of silt discharge
