黄茅海河口小尺度动力结构及其沉积作用

Dynamic Structures and Their Sedimentation Effects in Huangmaohai Estuary

基于１９８１～１９９１年多次水文泥沙测验及数学模型计算，分析了珠江黄茅海河口水动力特性。著重分析了河口低频水流与环流。观测和计算表明河口中部存在一低流速区，河口区拉格郎日流迹计算揭示了拦门沙形成的重要机制；黄茅海河口自北而南存在４个主要小尺度动力结构：巨大的崖门双向射流系统，垂直密度环流，三角山狭口射流和凯尔文水平环流。本文简要讨论了以上动力结构对河口沉积及地貌的重要作用。

Based on hydrographical surveys carried out during the period of 1985～1991,theoretical consideration and numerical models,the present paper provides a brief analysis on thedynamics of huangmaohai estuary,emphasizing on the low frequency flow patterns andcirculation. Labeled water parcel trajectories reveals the important formation mechanism of themid-estuary bar. Four small scale dynamic structures are found in the estuary along the Northand East Channel which have profound effects on the sedimentation,They are from north to south(1)the vasf Yamen bi-direction jet systam,(2)vertical density driven circulation,(3)gorge jet current and(4)horizontal circulation. The effects of estuarine dynamics on the sedimentation processes,especially those concerning the river mouth bar are discussed.