Long-term morphological modeling for Feiyun estuary with ESTMORF

Long-term morphological modeling for Feiyun estuary with ESTMORF

Shi, Y.B.

Civil Engineering and Geosciences

Hydraulic Engineering

2003-01-01

The Feiyun River, with a length of 203 km and a catchment area of 3252 km2, is one of eight rivers in Zheijiang Province (see fig.1-1), China. It flows into the East China Sea in Shangwang of Ruian City. The source of Feiyun River is at Xialing located in the border between Zheijiang and Fujian Province. The tidal influence can reach up the river as far as Tanjiao located 59 km from the river mouth in the dry season during spring tide. The downstream river reach of Tanjiao is called the estuary reach mainly controlled by tidal flow, and its upstream is called river reach controlled by the basin runoff. The Feiyun Estuary connects the sea to Ruian harbour. There is an old and a new harbour zone near the Feiyun first bridge in Ruian City. The old harbour is only suitable for 300T to 500T ships. A quay berth for 1000T ship is in the new part. With the development of the economics and foreign trade of Ruian City, the harbour is developing rapidly. Therefore, it is necessary for local government to carry out the channel improvement of the Feiyun estuary. A lot of human interference's are going on / planned in the Feiyun estuary. In the upstream reach of the Feiyun River, the large scale Sanxi reservoir has been constructed and began to store water. Further the diversion from the Zhaoshadu reservoir will also be carried out. A bend cut-off project is also in schedule in order to improve the flood defence and create land for Ruian City. It is no doubt that all these human activities will have important effect on the long-term morphological development of the Feiyun estuary, especially for the navigation channel of the downstream section of the Feiyun estuary. Within the framework of Delft Cluster project Ecomorphology of Estuaries and Coasts, the longterm morphological development of the Feiyun estuary has been carried out with the ESTMORF model, which belongs to the hybrid class of the models. The impact of the bend cut-off in the Feiyun estuary, the construction of the Sanxi reservoir and the diversion project, to the long-term morphological development is studied.

estuary
morphology

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© 2003 Shi, Y.