论文部分内容阅读
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。
This article focuses on the analysis of the changes of water and sediment in the lower Weihe River in recent ten years. It is pointed out that the decrease of water and sediment volume in the lower reaches of the Weihe River in recent ten years is mainly caused by the decrease of large-flow-rate water volume and sediment volume of main streams above Xianyang in the Weihe River. The decrease of water volume is much larger than the decrease of sediment volume. The analysis shows that the decrease of the low flow and the increase of the corresponding sand make the chance of high sediment and small flood increase. Adverse water and sediment conditions are the main reason for the serious decline of the main channel in the lower reaches of the Weihe River, the drastic decline of the flat beach and the steep rise of the flood level.