摘要
根据海岸带和海岛两次调查的实测资料和水下地形图，用动力地貌学方法对长江口三岛岸滩剖面的形态和冲淤变化进行研究。结果表明，分汊河口冲积岛岸滩有“江岸型”、“洲头型”和“潮滩（tidalbeach）型”三种基本类型；河槽变迁导致“江岸型”岸滩发生数年周期的变化，岸滩的季节性变化受风、海面、潮差和含沙量等多种因子影响，台风和寒潮则引起周期更短的“风暴旋回”，受植被保护的沼泽滩面的冲淤过程与光滩截然不同。
Based on observed and collected data of morphology, sediment hydrodyntrics, and wind, thes paper mainly deals with the shape, classification and erosionaccrehon cycles of coastal Profiles of the sediment islands in the Chaniang River esmp. Undr siledomnated and currentdominated condihons, the coastal morphology and morphodynamics in thes area are different from those on sandy beaches. Coastal profiles of the island are classified as three types: 'channl bank', 'hdal beach' and 'shoal head'. bee basic erosionaccrehon cycles are proposed and discussed: (a) 'interannual cycle', controlled by changes in river chann1; (b) 'seasonal cycle',influenced by seasonal variations in wind, sealevel and hdal range; and (c) 'storm cycle' caused by typhoons or cold waves. Because of the Protechon of vegetation, morphodndcs in marshes is apparenily dishnct compared with that on bare flats.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1999年第6期764-769,共6页
Oceanologia Et Limnologia Sinica
基金
教育部重点科学技术基金!98041
国家杰出青年科学基金!49825161
关键词
冲积岛
岸滩冲面
冲淤变化
长江口
冲淤规律
Sediment island Coastal profile Erosion-accretion cycle Changjiang River estuary
