珠江伶仃洋余流垂向分布的季节变化及其与径流的关系研究  

Seasonal variation of vertical profiles of residual currents in the Lingdingyang Estuary and its correlation with runoff of the Pearl River

作　　者：陈相铨[1,2] 朱良生[3] 王青[1,2] 黎满球[1] 邱章[1] 

机构地区：[1]中国科学院南海海洋研究所热带海洋环境动力学重点实验室,广东广州510301 [2]中国科学院研究生院,北京100049 [3]华南理工大学土木与交通学院,广东广州510641

出　　处：《热带海洋学报》2010年第5期24-28,共5页Journal of Tropical Oceanography

摘　　要：对伶仃洋河口湾出口某观测点一整年海流观测数据进行了余流分析,探讨了珠江伶仃洋余流垂向分布的季节变化及其与径流的关系。珠江伶仃洋余流的垂向分布具有明显的上溯流和下泄流分层现象,上溯流和下泄流厚度全年呈周期性变化;实测径流量与上层下泄余流流速有很好的线性关系,底层的上溯流与径流量大小的线性相关性不明显,但实测径流量与底层的上溯流有良好的指数相关性;在洪、枯季转换季节上溯流较小,在洪季和枯季上溯流较大。各月余流的垂线平均纵向水量输送并不一致,在夏季是指向下游,而在其他季节则指向上游,变化与径流量大小有较大的关系。全年的欧拉余流是向上游输送水量的。Base on the annually observed current data at a representative point in the Lingdingyang Estuary,the authors discuss the vertical profiles’ variation of residual currents and its correlation with runoff volume.It is found that the residual currents had an obvious vertical stratification of upstream current and drainage and that the thickness of upstream current and drainage assumed a periodic variation during the year.The actual runoff volume had a good linear relationship with the flow rate of the local surface current.It,however,had no obvious linear correlation with the bottom upstream;instead,it had a good exponential correlation with the bottom upstream.The upstream was small during seasonal transition,while it was large in flood and dry seasons.The average vertical transport of residual currents was different in each month,pointing to downstream in summer but to upstream in other seasons,and had more relations with the runoff volume of the Pearl River.The transport of Euler Residual Current was pointing to upstream for the whole year.

关 键 词：珠江口 伶仃洋 余流 垂向分布 

分 类 号：P731[天文地球—海洋科学]