| 摘要: |
| 建立了太湖梅梁湾三维营养盐浓度扩散模型，研究了在三维湖流的作用下，营养盐随风场的扩散情况。结果表明：（1）当梁溪河和闽江口两个污染源同时存在时，西北风最有利于营养盐浓度的扩散，顺着风向形成了一条西北-东南走向的污染带；而东南风却最不利于营养盐浓度的扩散，使得污染范围仅局限于污染源附近。（2）太湖海梁湾冬季比夏季更利于污染源浓度的扩散。（3）当风向有利于污染源浓度扩散时，随着风场强度的加大，污染源的扩散范围逐渐增大；反之当风向不利于污染源浓度扩散时，随着风场强度的加大，污染源的扩散范围反而减小。（4）当风向有利于污染源浓度扩散时，营养盐浓度的分布是自上而下递减的；反之当风向不利于污染源浓度扩散时，营养盐浓度的分布是自上而下递增的。 |
| 关键词: 营养盐浓度扩散 风场作用 污染源 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目，39500027号;江苏省社会发展研究基金资助项目，BS95035号 |
附件 |
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| STUDIES ON THREE—DIMENSIONAL HYDRO—DYNAMIC MODEL IN MEILIANG BAY OF TAIHU LAKESTUDIES ON THREE—DIMENSIONAL HYDRO—DYNAMIC MODEL IN MEILIANG BAY OF TAIHU LAKEII. The Diffusion of Nutrient Salt Under the Action of Three-Dimensional Currents |
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ZHU Yong-chun,CAI Qi-ming
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Nanjing Institute of Geography and Limnology, the Chinese Academy of Sciences, Nanjing, 210008
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| Abstract: |
| This three-dimensional diffusion model was developed to mainly study the distribution of nutrient salts under the action of three-dimensional currents in Meiliang Bay of Taihu Lake. Regarding the pollution source in the Liangxi River, the northeast wind is the most (the southwest wind is the least) beneficial to the diffusion of pollutants. In general, two pollution sources exist in Meiliang Bay at the same time, in which case the northwest wind is the most (the southeast wind is the least) beneficial to the diffusion of pollutants, and forms a pollution zone along the direction of wind. As the northern wind prevails in winter and the southern wind in summer, winter is more advantageous to the diffusion of pollutant than summer.
The variation of wind speed also affects the diffusion of pollutant. The extent of pollution increases with the increase of wind speed when the direction of wind is favorable, but decreases with the increases of wind speed when the direction of wind is unfavorable. In addition, the concentration of pollution decreases from the surface to the bottom in the case of the direction of wind being favorable to the diffusion of pollutant, but increases from the surface to the bottom in the case of the direction of wind being unfavorable. |
| Key words: Lake current, Pollutant diffusion, Pollution source |
