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于2008年在宜昌至徐六径之间的1600km干流河道进行30个横断面取样和分析,与前人于三峡水库蓄水前的取样分析资料进行对比。结果表明:①三峡水库蓄水以来坝下游约400km的干流河床(宜昌至城陵矶)沉积物出现全程粗化,越近大坝粗化越明显,这种沉积物粗化与水库蓄水后坝下游河床出现的强烈侵蚀密切相关;②蓄水前后城陵矶以下的1200km干流河床沉积物粒度的沿程趋势基本一致;③蓄水后河床沉积物仍保持沿程向下游变细且越近河口变化越缓慢的格局。
In 2008, 30 cross-sectional sampling and analysis of 1600km main stream between Yichang and Xujiujing were carried out, which were compared with those of the predecessor before the Three Gorges Reservoir was impounded. The results show that: (1) sediments in the main stream (Yichang to Chenglingji) of about 400 km downstream of the Three Gorges Reservoir have been roughed up, and the closer the dam is roughed, the more obvious this coarsening of sediments and the impoundment of reservoirs The strong erosion in the downstream of the dam is closely related; ②The sediment grain size along the 1200km main channel below Chenglingji is basically consistent with the trend along the river; ③the sediments in the river bed remain thinner and closer to downstream Estuary changes more slowly pattern.