海南东方岸外海底沙波活动性研究

Research on the Activity of Submarine Sand Waves off Dongfang,Hainan Island

对海南东方岸外 2 0～ 50 m水深海底沙波形成的动力环境、形态特征、剖面结构及其分布特征进行了描述和分析。根据环境参数 ,对其活动性进行了计算 ,并将计算结果与发育环境相类似的 Surtainville沙波进行了类比。认为研究区沙波主要系在潮流作用下形成。研究区沙波迁移速率为每年数米。东区 (水深 2 0～ 40 m)是沙波发育的主体 ,受落潮流作用 ,沙波自北向南迁移 ;西区 (水深 36～ 52 m)沙波受涨潮流控制自南向北迁移 ;中区为过渡区 。

In this paper, various features of submarine sand waves off Dongfang, Hainan Island (20 to 50 m water depth) are described, and these features include the dynamic environments, sand wave shape, profile structure and distribution characteristics. The sand wave activities were calculated by using the environmental parameters, and the analogue between the sand wave activities off Dongfang and Surtainville, France with similar developmental environments was made. It is concluded that the sand waves are formed mainly by the actions of tidal current, and the migration rate of sand wave in the study area is several meters a year. The eastern area (20～40 m water depth) is the main sand wave area, and the sand waves migrate from north to south due to the actions of ebb current; the sand waves in the western area (36～52 m water depth) are controlled by the flood current and migrate from south to north; and the intermediate area is a trasitional area with relatively stable sand waves.