明清渭河下游河道的变迁

The Course Changes in the Lower Reaches of River Wei in the Ming and Qing Dynasties

明清渭河下游泛滥决徙甚于前代。明代渭河“岁溢而善崩”，“率三二十年一徙”。清代更趋混乱，泛滥次数增多，规模增大，湾环不断。而南山支流入渭口泥沙堆积也在一定程度上改变了渭河河道。黄河的摆动和倒灌，使渭口伸缩，拦门沙增加，渭河变迁更趋复杂。1996年8月渭河下游出现罕见的大洪水，当是明清乃至近现代渭河变迁的结果。

There was considerable changes in the course of .the lowerreaches of River Wei in the Ming and Qing Dynasties. due to itsoverflows and bank burst, the accumulation of silt brought bytributaries in Nanshan at their flow into River Wei. and the reverse flow of the Yellow River.