闽江口水下三角洲的形成与演变Ⅲ.三角洲前缘与前三角洲

Formation and evolution of underwater delta in Minjiang Estuary Ⅲ. Underwater delta front and fore-delta

闽江口水下三角洲的形成与演变全文从分析控制或影响闽江口水下三角洲发育的环境因素入手，探讨了闽江口水下三角洲的地貌特征、成因及演变。研究结果表明，闽江口水下三角洲属于构造—潮控型三角洲，其地貌特征和成因与典型的潮成三角洲既有共同点，也存在着较大的差异。此外，其近期地貌的发育和演变亦受到人类工程活动的重大影响。这些结论可为闽江口航道综合整治工程提供科学理论依据。本文为其第三部分，主要探讨闽江口水下三角洲前缘和前三角洲的地貌特征及演变。

This paper discusses the geomorphological characteristics,origin and evolution of the underwater delta of Minjiang Estuary, based on the analysis of environment factors that con trol or affect its formation. The studied results indicated that the underwater delta of Min jiang Estuary can be classificated as a tectonic-tidal delta. Its geomorphological characteristics and origin are samed with those of typical tidal delta in a sense, but with larger differ ences. In addition, its recent geomorphological formation and evolution are significantly af fected by human engineering actions. These conclusions can provide scientific basis for the synthetical harnessing.project of shipping channel in the Minjiang Estuary. This paper is the third part of the series, which mainly discusses the geomorphological characteristics and evolution of the underwater delta front and fore-delta in the Minjiang Estuary.