下荆江系统裁弯对城陵矶至武汉河段的影响

The Effects of Systematic Cutoffs in the LowerReaches of Jingjiang on the Chenlinji-Wuhan Reachin the Middle Yangtze River

本文对下荆江系统裁弯后,长江中游城陵矶至武汉河段在不同水位(高水、平滩、中水、枯水)情况下的河床冲淤进行了计算,得出了本河段冲淤及汊道冲淤的变化规律。其次,着重分析了江湖关系调整所带来的各站水位的变化以及来水来沙的改变对本河段河道冲淤变化的影响:河床泥沙冲刷下移;落淤湖中泥沙骤减,单位水体挟沙剧增,悬沙粒径变粗。

In this paper, the scour and deposit of the riverbed of Chenlinji-Wuhan reach in the middle Yangtze River at different water levels (high,level beach,average,low)which occur after systematic cutoffs in the lower reaches of Jinjiang were calculated. The scour and deposit law of the river reach and the fork channel was obtained. Secondly,the water level variations of each station brought about by the adjustment of the relationship between river and lake and the effects of the changes of water-sediment on scour and deposit variation of the Chenlinji-Wuhan reach in the middle Yangtze River were analyzed emphatically.