钱塘江河口南岸西三潮沟形成演变及其治理

西三潮沟位于钱塘江河口南岸余姚与慈溪的交接地带,潮沟紧贴海塘,且处于动态变化之中,使得该段海塘一直处于被动抢险的局面。分析西三潮沟的成因及变化特征,科学治理西三潮沟显得十分迫切。通过对钱塘江河口江道变迁的分析,得到钱塘江河口治江围涂以及慈溪庵东滩面的淤高扩大是西三潮沟形成的原因。西三潮沟反向涨落潮流、进口位置的上下游摆动以及潮沟的冲淤变化是西三潮沟的演变特征。根据西三潮沟水流泥沙特点,在潮沟进口实施截堵潮流沟取得了成功。

Evolvement and regulation of Xisan furrow in south bank of Qiantangjiang Estuary

Xisan furrow is a transitional zone between Yuyao and Cixi city in the south bank of Qiantangjiang Estuary.The dynamic change furrow is closely adjacent to the seawall,people rushed to deal with the emergency even and again for the seawall safety.It is necessary for regulating the furrow which analyzing the forming cause and the process characteristics.According to the analysis of river bed variation in the Qiantangjiang Estuary,there are two reasons which the Xisan furrow are formed,one is the extensive reclamation in the Qiantangjiang Estuary,the other is the sedimentation and enlargement of Andong tidal flats.The flow in the Xisan furrow is antithetic with the normal current.The main characteristics of deformation are the change of furrow inlet and the erosion and deposition in the furrow.The inlet closure of furrow is successive by the significant hydraulic and sediment situation.