中文摘要：

瓯江口为典型强潮河口,其河口泥沙淤积体系却有其特殊性。为研究其规律,本文统计分析了该海区动力条件、地貌布局及其历史与现代演变过程,并进行了定量计算。结果表明,平行于海岸线的丘陵带对其河口泥沙沉积起地形遮蔽作用,从而形成了相对特殊的地貌特征。近几十年其地貌的自然发育主要表现为以拦门沙淤积为主导的连锁变化。人类活动对周边冲淤环境的影响已有数百年历史,且随着人口与技术水平的提升逐渐增大,在局部海区演化中已成为关键或主导因素。因此在掌握相应自然规律的前提下可以用工程措施对河口地貌演变进行部分甚至全面引导。

英文摘要：

As a typical strong tidal estuary, the Oujiang river estuary shows some special sedimentary features. This paper studied its dynamics, geomorphology and evolution. The results indicate that the enclosure of offshore islands that cover sediment deposition play an important role in the formation of special geomorphology. The natural evolution in recent decades was a set of mouth bar-controlled chain reactions. Human activities have affected the nearby siltation environments for hundreds of years, but along with population growth and implemented engineering, the effects have recently grown into a key factor in the variation of local geomorphology. Therefore, the evolution could be partly or even totally determined by engineering approach with an understanding of the estuary nature.