【作者】 杨阳； 李锐祥； 朱鹏利；

【Author】 YANG Yang Li Ruixiang Zhu Pengli South China Sea Engineering Surveying Center,State Ocean Administration,Guangzhou 510300,China

【机构】 国家海洋局南海工程勘察中心；

【摘要】 依据珠江口及其附近海域2006年～2007年四个航次的CTD资料,并结合同期风、海流、潮汐资料,分析珠江冲淡水扩展路径和范围,及讨论影响珠江冲淡水扩散的主要因子,结果表明,冲淡水存在明显的季节变化,夏季同时向粤西和粤东扩展,其余季节以西向扩展为主;风是珠江冲淡水在陆架区扩散的主要控制因子,风向控制珠江口冲淡水的扩展方向,风力大小控制其垂向厚度,西南季风有利于其向东及向外海扩展,但垂向厚度最薄,仅局限于上10m,东北季风驱使珠江冲淡水向西扩展并制约冲淡水向外海扩散;粤西沿岸余流全年以西向流为主,表明冲淡水全年向西扩散,粤东沿岸余流仅在夏季诱导冲淡水东扩;粤东海域与珠江口海域的水位差有利于夏季冲淡水东向扩散。更多还原

【Abstract】 Conductivity,Temperature and Depth(CTD),wind,current and tide data collected in the Pearl River estuary and surrounding sea areas during 2006 to 2007 was used for analyzing the expansion route and range of Pearl River diluted water(PRDW),and discussing the main factor which affecting the expansion of PRDW.It was shown that PRDW has significant seasonal variation.It expanded both westward and eastward in summer,while expanded mainly westward in other seasons.In the shelf region,wind was the key factor which affecting the expansion of PRDW,its direction was controlled by the wind direction and the thickness was controlled by the wind speed.The southwest monsoon was conducive to the eastward and offshore expansion of PRDW,however the thickness was very thin which was about 10m in the upper layer.The northeast monsoon drove PRDW to expand westward and constrained the offshore expansion.The residual current along the west coast of Guangdong province mainly flowed westward in the whole year,which was shown that the PRDW should expand westward,and the residual current along the east coast of Guangdong province only affected PRDW in summer and resulted in eastward expansion.The difference of sea level between east Guangdong and Pearl River estuary was conducive to eastward expansion of PRDW.更多还原