淤泥质海岸形态的演变及形成机制

Development and mechanism of transitional coast

在淤长型和侵蚀型岸段之间,存在着一种由淤积到侵蚀的过渡型岸段。通过剖面测量、粒度分析和地质调查,认为过渡型岸段具有上部淤积下部冲刷、冲刷逐渐向上部扩展、潮滩表层沉积物不断粗化、淤积带逐渐变窄最后过渡到全剖面侵蚀的基本特征和发展趋势。

In the muddy coast that makes up 92% of Jiangsu coastline, there are not only seriously eroding segments such as the Abandoned Huanghe River Mouth but also quickly prograding ones. Between the two kinds of coasts, there is a transitional coast from prograding to eroding. Measurements of coastal profiles, particle size analyses and geological investigations, indicate that the transitional coasts has some essential characteristics and developing tendencies as follows: prograding is found on the upper parts and eroding on the lower parts; erosion expands landward and the prograding area becomes narrower and narrower; and the whole profile will be eroded at last.