荆江-洞庭湖水沙变化影响分析

Analysis on water-sediment transportation variation of Jingjiang River-Dongting Lake

摘要: 荆江—洞庭湖水沙输移变化直接影响整个长江中游的防洪形势.通过实测资料分析了江湖水沙输移变化对荆江和洞庭湖的影响,分析表明,江湖水沙输移的调整变化引起下荆江流量的增加及城螺河段的淤积,城陵矶水位逐渐抬升,对荆江及洞庭湖防洪形势构成巨大威胁.采用河网水沙数学模型对三峡水库蓄水初期下游河道水沙输移变化及其影响进行了初步预测.计算结果表明,长江干流河道的冲刷使得荆江及洞庭湖区最高洪水位降低,防洪形势进一步缓和.

Abstract: The change of water-sediment transportation affects the flood control situation of the middle reaches of the Yangtze River.Based on the field data,the water-sediment transportation laws and effects are studied in this paper.Analysis results show that the variation caused the discharge increase of the Jingjiang River and the siltation in the Chenglingji-Luoshan reach.The water level of Chenglingji rises gradually,and it seriously imperils the flood control situation of the Jingjiang River and Dongting Lake.U...