杭州湾南、北两岸潮滩变迁遥感动态调查

杭州湾是钱塘江河口区外海滨部分,其水动力条件、泥沙运移、沉积过程和地貌演变复杂。根据杭州湾区域遥感影像和地理地形等资料,通过综合分析研究,探讨了杭州湾南、北两岸潮滩的变迁过程。研究表明:杭州湾南、北两岸潮滩的发展程度不同,总体呈现南淤北侵的趋势。 43年来,北岸滩界变动范围基本限制在 1955年潮滩界线之内,潮滩面积呈负增长;南岸扇顶滩界外移 12550m,外移速率达 + 292m/a。潮滩的发展具有空间、时间上的差异性,南岸潮滩淤涨集中在 1955～1963年和 1977～1987年;北岸负增长则集中在 1955～1963年及 1987～1998年。进一步研究还发现:潮滩发育的差异性主要受岸线的空间地貌位置的影响。

REMOTE SENSING DYNAMIC MONITORING OF TIDAL BANKS IN THE HANGZHOU BAY

The Hangzhou Bay is an outside strand of the Qiantang River with complicated dynamic conditions, sediment transport, sedimentological processes and morphological evolution. Based on a great amount of remote sensing data and topographic data, this paper discussed evolution of the tidal banks in the Hangzhou Bay since 1955. The results suggested that the evolutionary processes of the tidal banks in the Hangzhou Bay might be varied. The north beach line changed within the line in 1955, and the tidal bank area increased negatively, while the south beach line moved outside for 12 550 m, with a velocity being 292 m/a. The negative growth of north bank was mainly occurred from 1955 to 1963, and from 1987 to 1998, while the silting of south bank was mainly occurred from 1955 to 1963, and from 1977 to 1987. The difference of the evolutionary processes in the Hangzhou Bay was influenced by the spatial and morphological location.