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。
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 flowdue 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.
出处
《水科学进展》
EI
CAS
CSCD
1996年第2期144-150,共7页
Advances in Water Science
关键词
河口泥沙
形成
推移质
输移
水流扩散
anabranched estuary
mechanism of formation
bed load transport
flow diffusion
estuarine bar.
