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| Wind impact on pollutant transport in a shallow estuary | |
| 作者姓名： | XU Hongzhou LIN Jing SHEN Jian WANG Dongxiao |
| 作者单位： | Key Laboratories of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695, USA;State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695, USA;State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;Virginia Institute of Marine Science, The College of William and Mary, Gloucester Point, VA 23062, USA;Key Laboratories of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China |
| 基金项目： | 广东省科技攻关计划，Coupling Watershed/Estuarine Water Quality Model |
| 摘 要： | A three-dimensional numerical model, EFDC （ environmental fluid dynamics code） is applied to the Pamlico River Estuary （PRE） in eastern North Carolina of the United States to examine the wind impact on pollutant age distributions and residence time. A series of model experiments representing base case, remote-wind-induced water level set-up and local winds cases are conducted. Model results indicate that the pollutant mean age and the system residence time are functions of gravitational circulation in the PRE. The system responses to remote-wind-induced water level set-up are different in different portions of the PRE. Under such condition, dissolved substances in the upstream portion of the PRE have a younger age and shorter residence time （compared with the base case） , by contrast, they have a older age and longer residence time in the downstream portion of the PRE. Upriver and downriver local winds appear to have opposite impacts on pollutant age distributions. The substances are retained much longer within the PRE under upriver wind than those under downriver wind. The model results also suggest that across - river winds may lead to longer residence time through enhanced turbulence mixing, which slows down the gravitational circulation in the PRE. |
| 关 键 词： | 帕姆利科湾 浅湾 重力循环 盐量 |
| 收稿时间： | 2007/9/15 0:00:00 |
| 修稿时间： | 2008/2/28 0:00:00 |
Wind impact on pollutant transport in a shallow estuary |
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| XU Hongzhou,LIN Jing,SHEN Jian,WANG Dongxiao.Wind impact on pollutant transport in a shallow estuary[J].Acta Oceanologica Sinica,2008,27(3):147-160. | |
| Authors: | XU Hongzhou LIN Jing SHEN Jian and WANG Dongxiao |
| Institution: | 1. Key Laboratories of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695, USA;State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062 2. Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695, USA;State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China 3. Virginia Institute of Marine Science, The College of William and Mary, Gloucester Point, VA 23062, USA 4. Key Laboratories of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China |
| Abstract: | A three-dimensional numerical model, EFDC (environmental fluid dynamics code) is applied to the Pamlico River Estuary (PRE) in eastern North Carolina of the United States to examine the wind impact on pollutant age distributions and residence time. A series of model experiments representing base case, remote-wind-induced water level set-up and local winds cases are conducted. Model results indicate that the pollutant mean age and the system residence time are functions of gravitational circula-tion in the PRE. The system responses to remote-wind-induced water level set-up are different in different portions of the PRE. Under such condition, dissolved substances in the upstream portion of the PRE have a younger age and shorter residence time (compared with the base case), by contrast, they have a older age and longer residence time in the downstream portion of the PRE. Upriver and downriver local winds appear to have opposite impacts on pollutant age distributions. The substances are re-tained much longer within the PRE under upriver wind than those under downriver wind. The model results also suggest that across -river winds may lead to longer residence time through enhanced turbulence mixing, which slows down the gravitational circulation in the PRE. |
| Keywords: | Pamlico River Estuary (PRE) mean age residence time gravitational circulation salt intrusion |
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