巴达棱湾悬沙分布特征及动力机制  

Distribution and dynamic mechanism of suspended sediment in the Tuy Phong Bay

作　　者：杨阳[1] 李锐祥[1] 刘愉强[1] 朱鹏利[1] 陆茸[1] 

机构地区：[1]国家海洋局南海工程勘察中心,广东广州510300

出　　处：《热带海洋学报》2014年第6期24-30,共7页Journal of Tropical Oceanography

基　　金：国家海洋局青年基金项目(2012513)

摘　　要：利用2007 年4 月和7 月在巴达棱湾进行的旱季和雨季水位、流速、悬沙浓度的全潮观测资料, 结合2007 年5 月~2008 年4 月周年风、波浪资料, 分析该海域悬沙分布特征和运移趋势, 并利用机制分解法分析悬沙输运机制.结果表明, 研究海域的水体含沙量存在旱季低、雨季高的季节变化, 以及大潮高、小潮低的潮期变化; 在平面上表现出东西两侧大、中间小, 近岸高、远海低的分布特征.单宽输沙量方向与余流方向一致, 表现为旱季冲刷、雨季淤积, 即旱季指向外海, 雨季指向湾内.通量机制分析结果表明, 欧拉余流是悬沙输运的主要控制因素, 其方向和大小决定了泥沙输移方向和输移量, 在水深较深海域, 垂向重力环流是相对次要的, 而在水深较浅的海域相对次要的是悬沙潮泵输运项.Base on the sea level, current, suspended sediment concentration data observed during the dry season in April 2007and the rainy season in July 2007 in the Tuy Phong Bay, and combined with the annual data of wind and wave from May 2007to April 2008, the distribution and transport trend of suspended sediment in this area was analyzed. We also carried outdynamic mechanism analysis of suspended sediment transport using the mechanism decomposition method. We found that thesuspended sediment concentration had the seasonal property of being lower in dry season and higher in rainy season, the tidalproperty of being higher during spring tide and being lower during neap tide, and the spatial property of being higher at theeast and west sides and being lower in the middle of the bay and of being higher in the near coast region and being lower in theoffshore region. The direction of sediment transport per width was consistent with the residual current direction, which wasoffshore in dry season and onshore in rainy season. The result of transport dynamic analysis showed that the Eulerian residualcurrent was the main control factor for suspended sediment transport, and that the direction and mass of sedimenttransportation were determined by the residual current, with the secondary control factors being vertical movement in deeperregion and tidal pumping in shallow region.

关 键 词：巴达棱湾 悬沙 潮泵效应 通量分解 

分 类 号：P731.2[天文地球—海洋科学] P737.14