多年调节水库对河口河床冲淤的影响——以新安江水库对钱塘江河口影响为例

Effect of Year-to-year Reservoir on Estuarine Fluvial Process——Regard the Effect of Xin'anjiang Reservoir on Qiantang Estuatry as Example

多年调节水库兴建后 ,如迳流旁引会导致河口段的淤积。以发电、防洪为主要目标仅进行洪、枯流量调节的水库同样会引起河口段河床冲淤幅度的减少。本文以新安江水库投入运行前、后二十余年钱塘江河口江道地形的变化为例 ,说明建库后冲淤幅度和总容积均减少。再用一维动床数学模型进行了验证和各种计算 ,说明建库对河口冲淤影响的定量程度。

The construction of reservoirs often results in an obvious effect on the deposition/erosion in estuarine reach.By taking Xin′an jiang reservoir as an example,the measured topographic data of Qiantang Estuary for more than twenty years before and after the operation of the reservoir are analyzed.In addition,a 1-D mathematical model for sediment transport is applied to simulate the change of bed form in the estuarine reach.