防城港湾以西海域水体输运及其机制研究

Study on Water Transport and Mechanism in the West Waters of Fangchenggang Bay

关键词:  防城港湾  余流特征  水体输运  机制  环流

Key words:  Fangchenggang Bay  residual current characteristics  water transport  mechanism  circulation

摘要:

为了探究防城港湾外海域的水体输运方式及机制，本文对历史调查数据及最新的海流调查资料的海流玫瑰图进行分析，结果发现：防城港湾以西海域的水体输运，冬季为反气旋式环流控制，水体输运主要为NE向；夏季为沿岸入海径流、气旋涡控制，水体输运主要为WSW向。春季和秋季，表层水体输运主要为WSW向，中层以下水体输运为NE向。风对表层流的影响较明显，夏季西南季风造成沿岸水的堆积产生正压梯度力使表层水体往西南向输运，但不起主导作用。中层以下主要受北部湾北部气旋式、反气旋式两种不同形式的环流控制。除此之外，琼州海峡西向流、入海径流、地形等对水体输运也产生重要的作用。

Abstract:

In order to explore the water transport mode and mechanism in the waters outside Fangchenggang Bay,the current rose diagram of historical survey data and the latest current survey data are analyzed in this article.The results showed that the water transport in the west waters of Fangchenggang Bay was controlled by anti-cyclonic circulation in winter,and the water transport was mainly in NE direction.In summer,it was controlled by coastal runoff and cyclonic eddy,and the water transport was mainly WSW.In spring and autumn,the transport of surface water was mainly WSW,and the transport of water below the middle layer was NE.The influence of wind on the surface flow was obvious.In summer,the southwest monsoon caused the accumulation of coastal water to generate a barotropic gradient force to transport the surface water to the southwest,but it did not play a leading role.Below the middle layer,it was mainly controlled by two different circulation forms of cyclone and anticyclone in the northern Beibu Gulf.In addition,the westward flow from Qiongzhou Strait,runoff into the sea and topography also play an important role in water transport.