| 分汊河口的形成机理 |
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| 引用本文： | 孙志林,金元欢.分汊河口的形成机理[J].水科学进展,1996,7(2):144-150. |
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| 作者姓名： | 孙志林 金元欢 |
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| 作者单位： | 杭州大学地理系 杭州 310028 |
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| 摘 要： | 从输沙的力学角度探讨分汊河口的形成机理.认为分汊河口系许多因子共同作用所造成,而推移质的造床作用是在河口特定的边界、水流及泥沙输移恰当配合下形成河口沙洲,从而导致河口分汊的主导因子;河流注入海洋时边界突变引起的水流扩散减速则是推移质集中堆积而塑造河口沙洲的外部必要条件;河口悬移质中粘细物质含量丰富并在盐淡水混合环境中絮凝沉降为沙洲堆积增高和稳定提供了可靠保证,故也是分汊河口形成的重要原因.
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| 关 键 词： | 分汊河口 形成机理 推移质输移 水流扩散 河口沙洲 |
| 收稿时间： | 1994-10-19 |
Mechanism of Formation of an Anabranched Estuary |
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| Sun Zhilin,Jin Yuanhuan.Mechanism of Formation of an Anabranched Estuary[J].Advances in Water Science,1996,7(2):144-150. |
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| Authors: | Sun Zhilin Jin Yuanhuan |
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| Institution: | Hangzhou University, Hangzhou 310028 |
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| Abstract: | Mechanism of formation of an anabranched estuary is discussed from the viewpoint of mechanics of sediment transport.It is suggested that the formation of the anabranched estuary is attributed to many factors,among which the bed-forming role of bedload is the most dominant one under suitable combination of boundary condition,flow and sediment transport.The diffusion and deceleration of flow due to abrupt change of estuarine boundary is necessry condition for the accumlation of bedloas and the development of estuarine bars.Morever,a very high clay content in suspended sediments which can ensure silting up and stability of estuarine bars also plays important role in the formation of anabranched estuaries. |
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| Keywords: | anabranched estuary mechanism of formation bed load transport flow diffusion estuarine bar |
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