中文摘要：

在大量实测资料的基础上,对瓯江口外海区水沙运动特征、动力形成机制、滩槽演变规律及其主要原因进行了深入研究,以期为瓯江口海区的规划与建设提供科学依据。研究结果表明,瓯江口外海区发育有典型的瓯江口拦门沙滩槽体系和乐清湾潮流通道体系,潮流是塑造海区地貌的主要动力,地形是影响海域演变的主要因素。在1964-2005年40余年间,口外海区滩槽体系的演变既遵循自然演变的趋势又受到人类活动的影响,各动力地貌单元的演变相互促进或限制,人类活动的干预虽然在短期内使得海区滩槽体系的演变方向受到影响,但就目前而言这种影响并未改变滩槽的整体稳定态势。

英文摘要：

Based on a large number of measured data,we discuss the characteristics of flow and sediment movement,dynamic mechanism,evolution of shoals and channels and together with its main causes in the offshore area of Oujiang Estuary area.The results show that in the offshore area,there are two typical systems developed： Oujiang Estuary shoal-channel system and Yueqing bay tidal inlet system.Tidal currents are the main dynamic forces to shape the geomorphology.From 1964 to 2005,with the interaction of evolution of geomorphic units,evolution occurs on the two systems,influenced by both natural tendency and human activities.Although the geomorphic evolution in the offshore area has been changed to a certain extent by the constructed projects,so far it remains stable as a whole.