渭河下游淤积上延分析

从河道累积淤积量对洪水位的影响及河道断面间的冲淤变化情况两方面论证了渭河下游的淤积上延范围；并进一步根据溯源淤积和沿程淤积的淤积机理，通过对渭河下游淤积特性进行分析得出，在三门峡水库控制运用以前，渭河下游泥沙淤积上延乃是潼关高程抬升所致；在三门峡水库控制运用以后，渭河下游泥沙淤积上延乃是溯源淤积和沿程淤积所为。

Deposition extension headwater in lower Weihe River

The deposition extension headwater was analyzed from two aspects: the effect of accumulative deposition in the lower Weihe River on floodwater level and riverbed changes of erosion and deposit between cross_sections in the lower Weihe River in this paper. Based on the mechanism of retrogressive deposition and progressive deposition, the authors think that the rising of Tong Guan riverbed led to deposits extension headwater of the lower Weiher River before the Sanmenxia reservoir being in control operation and retrogressive deposition and progressive deposition in the lower Weihe River led to deposition extension headwater after the Sanmenxia reservoir being in control operation