2000年黄河下游河道冲淤及河床演变情况分析

根据1999年11月－2000年10月黄河下游的监测资料，分析了小浪底水库的出库水沙特点，全面研究了下游河道冲淤，床沙粗化，河道断面形态变化及河热变化，对小浪底水库调水调沙运用的减淤效果进行了分析计算。同时，就2000年10月－2001年2月向天津紧急供水对减淤的影响也作了分析研究。研究表明，尽管这一时期进入黄河下游的水量为历史最枯，但黄河下游仍减淤2．16亿t，而且未出现大的河势变化及工程险情。

Analysis on Erosion-deposition of Channel and Fluvial Process in the Lower Yellow River in 2000

According to monitoring data in the Lower Yellow River from Nov., 1999 to Oct., 2000, the characteristics of water and sediment out Xiaolangdi Reservoir have been analyzed, the erosion-deposition of channel in the lower reaches, bed sediment coarsening, sectional morphologic variation and river regime variation have been studied thoroughly, and the effect of deposition reduction on operation of regulating water and sediment in Xiaolangdi Reservoir has been analyzed and calculated. Simultaneously the effect of water supply to Tianjin urgently from Oct., 2000 to Feb., 2001 on deposition reduction has been also analyzed and studied. It is shown from the results that though water volume into the Lower Yellow River during this period is the lowest in history, the deposition reduction is still 0.216 billion t in the Lower Yellow River, therefore there are no great changes of river regime and dangerous situation of project occurred.