丰、枯水期珠江河口水体交换的数值模拟  

Simulation of the water exchange in the Pearl River Estuary during wet and dry seasons

作　　者：裴木凤 李适宇[1,2] 胡嘉镗[1,2] 胡希声[4] 

机构地区：[1]中山大学环境科学与工程学院,广东广州510275 [2]广东省环境污染控制与修复技术重点实验室,广东广州510275 [3]国家海洋局北海海洋环境监测中心站,广西北海536000 [4]国家海洋局南海环境监测中心,广东广州510300

出　　处：《热带海洋学报》2013年第6期28-35,共8页Journal of Tropical Oceanography

基　　金：广东省近岸海洋综合调查与评价("908"专项)子课题(GD908-02-03);海洋公益性行业科研专项经费项目(200805015)

摘　　要：基于一、三维耦合的溶解态保守性物质对流扩散模型,计算了丰水期(1999年7月)和枯水期(2006年2月)珠江河口水体的平均停留时间。计算结果表明,珠江河口的水体交换有明显的季节特征,丰、枯水期珠江口的水体平均停留时间分别为8.9d和27.3d,内伶仃洋和外伶仃洋分别为丰水期与枯水期水体交换最强与最弱的子区域。仅考虑潮汐时,小潮时期珠江河口水体的平均停留时间小于大潮时期,而综合径流、季风等影响因素后则与之相反。空间上丰、枯水期均表现为口门附近水体停留时间较短,远离口门的水体停留时间较长。丰、枯水期珠江河口水体的平均停留时间均表现出从表层向底层递增的趋势,丰水期的垂向差异大于枯水期。Coupled one- and three-dimensional advection-diffusion models of dissolved conservative tracer were used to simulate the average residence time of the Pearl River Estuary in July 1999 （wet season） and February 2006 （dry season）. Results indicate that the average residence time shows significant variation between wet and dry seasons. The average residence time of the estuary is 8.9 days in wet season and 27.3 days in dry season. In both seasons, the water exchange is the strongest in inner Lindingyang and the weakest in outer Lindingyang. The residence time of the estuary is longer at the spring tide than at the neap tide; however, it generally acts reversely with river runoff and monsoon. Actually, the residence time is relatively shorter in the regions adjacent to the river outlets and relatively longer in the outer regions, and it increases with depth, with more evident difference in the vertical in wet season than in dry season.

关 键 词：珠江河口 水体交换 停留时间 耦合计算 

分 类 号：P731.26[天文地球—海洋科学]