长江中游非均匀沙冲淤对来水来沙响应初步分析

Preliminary study on responses of non-uniform sediment scouring and silting in the middle Yangtze to its inflows

为分析长江中游河段不同粒径组泥沙冲淤对来水来沙的响应,本文依据年统计资料,建立了非均匀沙冲淤量与来水来沙量的相关关系。分析结果表明,长江中游非均匀沙年冲淤量与年输入沙量的关系比较密切,泥沙粒径越大,其相关性越强,且单位来沙量改变引起的河道冲淤量越大、河道冲淤平衡时对应的临界输入沙量越小。

Correlation relationships between the non-uniform sediment scouring and silting in the middle Yangtze and its water and sediment inflows were established by using statistics of annual average data to analyze the river＇s responses.These correlations show that the annual scouring/silting volumes depend much on the sediment inflow,that the correlation tends better for greater particle sizes of incoming sediment,and that a higher sensitivity in the scouring/silting responses corresponds to smaller critical sediment inflows of the river reach equilibrium.