海南岛南渡江三角洲北部沿岸的泥沙转运和岸滩运动

SEDIMENT TRANSPORTATION AND BEACH MOVEMENT ALONG NORTHERN COAST OF NANDU RIVER DELTA,HAINAN ISLAND

南渡江三角洲海岸可分为东部废弃侵蚀岸、北部泥沙转运岸和西部淤涨堆积岸等三个岸段。北部岸段为了连接东、西部岸段，存在大规模的、有节奏的沿岸泥沙向西和向岸转运及其相应的岸滩运动现象，泥沙主要来自南渡江干流河口及其以东的废弃侵蚀岸。文中还结合对北部岸段河口和沿岸泥沙转运现律的分析，讨论了波浪优势型河口三角洲特征及其堡岛海岸的形态、动态和泥沙来源以及人类活动对该岸段的影响等问题。

The coast of the Nandu River delta may be classified into 3 segments, i.e. the abandoned erosion segment in the east the sedimenttranspoftation segment inthe north, and the flood-silhng deposihon segment in the west. To connect theeastern and western segments, there exist largexscale rhythmical westward andlandward transportation of littoral sediments in the northem segment and correspondingbeach movement. Sediments principally come from the truck stream mouth of theNandu fover and the abandoned erosion segment to the east of it. Based on theanalysis of the longshore transportation law of sediments in the northern segment thefeatures of wave-dominated estuary and delta, the shape and development of baniercoast, the source of sediments, and the influence of human activihes on the coast aredi scus sed.