摘要:
一个河口发育模式的建立,在理论上和生产实践方面都具有重要的意义。它既阐明了这一河口发育的基本规律和为判定河口发育趋势提供理论根据,也为河口治理的方针和具体规划提供可靠的科学依据。作为我国第一大河长江的河口,其演变过程极为复杂,总结长江河口的演变规律,确定其发育模式,对于长江河口的治理将具有重要的现实意义。近年来笔者等从事长江河口的历史过程和现代演变规律的研究,认为长江河口近两千年来的发育模式可概括为如下几个方面:1.南岸边滩推展,2.北岸沙岛并岸,3.河口束狭,4.河道成形,5.河槽加深。
Abstract:
This paper,based upon field observations,hydrological surveys and historical literture,is intended to reveal the development of the Chang Jiang River Estuary during the last 2000 years.According to the authors,the sequence of events in its development may be epitomized as follows:(1)gradual growth of shoals near by the south bank,(2)attachment of shoals and isIand to the north bank;(3)narrowing of the estuarine reach,(4)formation of a normal channel,(5)deepening of the channel.Such a developmental model is of great significance in the theory as well as in practice.
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