海南岛西部岸外沙波的高分辨率形态特征  

HIGH-RESOLUTION MORPHOLOGICAL CHARACTERISTICS OF SAND WAVES OFF THE WEST HAINAN ISLAND

作　　者：曹立华[1] 徐继尚[1] 李广雪[1] 史经昊[1] 

机构地区：[1]中国海洋大学海洋地球科学学院

出　　处：《海洋地质与第四纪地质》2006年第4期15-22,共8页Marine Geology & Quaternary Geology

基　　金：国家重点基础研究发展规划项目(2005CB422304)

摘　　要：利用SIMRAD—EM3000多波束探测系统和DGPS定位系统，对海南岛东方岸外的沙波沙脊区进行了高精度探测，分析结果表明：从海岸到陆架底形具有明显的分带性，依次出现弱侵蚀底形段、沙波沙脊底形段和平坦底形段。沙波仅发育于沙波沙脊段，介于水深20～50m之间，沙波形态有二维与三维两种，沙波波高多为0．7～2．5m，波长20～70m，沙波指数（L／H）为20～60，对称指数为1～3；沙波沙脊区沉积物的搬运方向有明显的规律性，在沙脊的西侧，沉积物主要向北搬运；在沙脊的东侧，沉积物主要向南搬运；沙波的形成和发育主要受潮流场控制，热带风暴对其有改造作用。The sand waves in the eastern Beibu Gulf off Dongfang coast were high-accurately investigated by using SIMRAD-EM3000 multibeam sounding system and DGPS position system. The investigated results indicate that. （1） the bedform from coast to continental shelf obviously has the character of zonation, that is poor-erosion zone, the sand wave and ridge zone and the flat zone. Sand waves only exist in the sand wave and ridge zone, which is in the depth of 20-50 m. The sand waves have many shapes, including two and three dimensional sand waves. The wave height is 0. 7-2.5 m and length is 20-70 cm, and the ratio of L/H is 20-60 and the symmetry index （the ratio of gentle slope to steep slope） is 1-3. （2） The transportation direction of the sediment in sand wave and ridge zone presents an apparent regularity. On the west edges of the ridges, sediment transport is mainly towards north; while on the east edges of the ridges, sediment transport is mainly towards south. （3） The formation and development of these sand waves are mainly controlled by tidal current and also influenced by tropical storm.

关 键 词：沙波 沙脊 底形 高分辨率 多波束探测 海南岛西部岸外 

分 类 号：P736.4[天文地球—海洋地质]