关键词: 钱塘江河口, 河口治理, 海塘, 围垦

Abstract: This paper concludes the historical achievements in the regulation of the Qiantang estuary over the past 40 years. During this period about 64km unstable channels in the estuarine reach, were tidal-bore takes place, have been narrowed and regulated. At the same time about 600 sq.km of tidal-flats were reclaimed which has created a great wealth for the country. Nevertheless, the land reclamation along the south bank has pushed the tidal currents to the north bank which erode the sediments under the ancient stone dyke and loose the dyke structures. There is a urgent need to repair or reconstruct the coastal dyke. Considering the important role of seawall along the north bank of the Qiantang estuary in protecting the coastal society in the low-lying Taihu plain, it is imperative to make a comprehensive and integrated regulation on the seawall. After an evaluation of the engineering plan for constructing the standard dyke, this paper proposes that the scheme is feasible, with a strong basis, a clear aim, and an economic rationality. This paper also makes a discussion on the future estuarine regulation, especially on the problems concerned with the transition from the near-estuarine reach to the estuarine reach, and from estuarine reach to the Hangzhou Bay. It is also proposed that the sediment exchange between the outside and the inside of the estuary should be taken as a key issue to be studied.

Key words: Qiantang estuary, estuarine regulation, dyke, reclamation