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本文简要地阐述了三门峡水库修建前后,泾、渭河水沙基本特性、渭河下游河道特征、冲淤变化,以及潼关局部侵蚀基准面的升降、渭河口拦门沙消长对渭河河道演变的影响,着重分析了建库后渭河下游河道比降、河床形态、河床物质组成诸因素的调整过程,以及渭河下游滩、槽淤积末端延伸的基本物理图形和延伸规律。指出河床调整及淤积末端发展的趋势。对影响淤积延伸的因素进行了初步的探讨。
This paper briefly expounds the basic characteristics of water and sediment before and after the Sanmenxia reservoir construction, the characteristics of the water and sediment in the Jinghe and Weihe River, the features of the Weihe River, the erosion and deposition, the elevation of the erosion level in the Tongguan section, the influence of sand extinction in the Weihe Estuary on the evolution of the Weihe River. The adjustment process of the riverway drop, riverbed shape and river bed material composition in the lower reaches of the Weihe River after reservoir construction was analyzed, and the basic physical pattern and extension law of silt end extension in the lower reaches of Weihe River were analyzed. Point out the trend of river bed adjustment and sedimentation end development. The factors that affect the extension of siltation are discussed preliminarily.