三峡库区泥沙分布规律初探

Preliminary study on sediment concentration distribution in the Three Gorges reservoir

为了探究三峡库区泥沙运动及其分布规律,长江水利委员会水文局实地勘测收集了三峡库区代表站临底泥沙资料.采用该实测资料与常规泥沙观测资料,运用非线性回归技术,分析了不同水力条件和泥沙粒径组成等情况下三峡库区悬移质泥沙的横向、垂向分布情况,认为库区水体在大水深小含沙量情况下,泥沙横向分布趋于均匀;垂向底部区域泥沙输移占比较大,发现库区控制站I,II型两种泥沙垂线分布类型均普遍存在,垂线底部0.2h以下区域泥沙输移总量约占垂线输移总量的10%以上,并根据三峡库区泥沙特性对目前泥沙观测方式提出了建议.

To investigate the mechanism and distribution of sediment transport in the Three Gorges reservoir,the Bureau of Hydrology of the Changjiang Water Resources Commission has committed the survey and collected precious sediment data including those in the adjacent area of riverbed.Base on these measured data,the paper has explored the lateral and vertical distribution of sediment in the Three Gorges reservoir by using modern statistics,which classify observations into few groups according to hydraulic conditions and sediment transportation.It is seen that the lateral distribution of sediment is uniform in the reservoir and the adjacent area of riverbed has large weight in the sediment transportation.Two types of sediment vertical distribution are found.Since more than 10% sediment transportation is in the adjacent area of riverbed which is between 0.2 h（0.2 times water depth） under the water,some suggestions on the sediment observation scheme are proposed in the study.