鄱阳湖水流运动与污染物迁移路径的粒子示踪研究
发布时间：2018-12-17 14:29
【摘要】：湖泊水流运动和污染物的迁移路径对湖泊水质起着关键作用。采用水动力和粒子示踪耦合模型,并结合野外粒子示踪实验来调查鄱阳湖洪水季节空间水流运动和污染物迁移路径。模拟结果显示,流域五河点源入湖污染物和湖区空间面源分布污染物均会沿着不同方向迅速进入湖泊主河道,在快速水流推动下逐渐向北部湖区迁移,但部分污染物因东北部湖湾区存在顺时针方向环流而发生长时间滞留和富集。野外粒子示踪实验同样表明,东北部湖湾区污染物迁移路径随着该湖区水流运动表现得复杂多变,除了可以明显观察到顺时针方向的污染物运动,还可以发现污染物向湖岸边界和湖汊迁移,最终滞留在东北部湖湾区,而康山湖区污染物在快速水流推动下主要沿主河道向西北主湖区迁移,未发现污染物进入东北部湖湾区的迹象。鄱阳湖洪水季节水流运动和污染物迁移路径具有枯水期水流-污染物传输特性。模拟得出鄱阳湖洪水期的平均换水周期约89 d,表明其可能需要近3个月时间才能彻底完成一次换水。研究成果可为大型通江湖泊"江湖关系变化"研究提供参考,对保护"一湖清水"、保障长江中下游水环境安全具有重要现实意义。
[Abstract]:The lake water flow movement and pollutant transport path play a key role in lake water quality. The hydrodynamic and particle tracer coupling model and field particle tracing experiments were used to investigate the spatial water flow movement and pollutant transport path in the flood season of Poyang Lake. The simulation results show that the point source pollutants of the five rivers and the spatial non-point source pollutants in the lake region will rapidly enter the main lake channel along different directions, and gradually migrate to the northern lake area under the impetus of rapid water flow. However, some pollutants are trapped and enriched for a long time due to clockwise circulation in the northeastern Lake Bay. Field particle tracing experiments also show that the pollutant migration path in the northeastern Lake Bay is complex and changeable with the flow of water in the lake region, except that the clockwise movement of pollutants can be observed obviously. It can also be found that the pollutants migrate to the boundary of the lake bank and the branch of the lake, and eventually stay in the northeastern lake bay, while the pollutants in the Kangshan Lake region migrate mainly along the main channel to the northwest main lake area under the driving of rapid water flow. There were no signs of pollutants entering the northeastern lake bay. The water flow movement and pollutant transport path of Poyang Lake during flood season have the characteristics of fluid-pollutant transport in dry season. The simulation results show that the average water exchange period of Poyang Lake is about 89 days, which indicates that it may take nearly three months to complete a complete water exchange. The research results can provide a reference for the study of the change of the relationship between rivers and lakes, and have important practical significance for the protection of "one lake clear water" and the protection of the water environment safety in the middle and lower reaches of the Yangtze River.
【作者单位】： 中国科学院南京地理与湖泊研究所流域地理学重点实验室;中国科学院大学;江西师范大学鄱阳湖湿地与流域研究教育部重点实验室;
【基金】：江西省重大生态安全问题监控协同创新中心项目(JXS-EW-00) 国家自然科学基金项目(41401031,41371062,41301023)~~
【分类号】：X524
，
本文编号：2384323
[Abstract]:The lake water flow movement and pollutant transport path play a key role in lake water quality. The hydrodynamic and particle tracer coupling model and field particle tracing experiments were used to investigate the spatial water flow movement and pollutant transport path in the flood season of Poyang Lake. The simulation results show that the point source pollutants of the five rivers and the spatial non-point source pollutants in the lake region will rapidly enter the main lake channel along different directions, and gradually migrate to the northern lake area under the impetus of rapid water flow. However, some pollutants are trapped and enriched for a long time due to clockwise circulation in the northeastern Lake Bay. Field particle tracing experiments also show that the pollutant migration path in the northeastern Lake Bay is complex and changeable with the flow of water in the lake region, except that the clockwise movement of pollutants can be observed obviously. It can also be found that the pollutants migrate to the boundary of the lake bank and the branch of the lake, and eventually stay in the northeastern lake bay, while the pollutants in the Kangshan Lake region migrate mainly along the main channel to the northwest main lake area under the driving of rapid water flow. There were no signs of pollutants entering the northeastern lake bay. The water flow movement and pollutant transport path of Poyang Lake during flood season have the characteristics of fluid-pollutant transport in dry season. The simulation results show that the average water exchange period of Poyang Lake is about 89 days, which indicates that it may take nearly three months to complete a complete water exchange. The research results can provide a reference for the study of the change of the relationship between rivers and lakes, and have important practical significance for the protection of "one lake clear water" and the protection of the water environment safety in the middle and lower reaches of the Yangtze River.
【作者单位】： 中国科学院南京地理与湖泊研究所流域地理学重点实验室;中国科学院大学;江西师范大学鄱阳湖湿地与流域研究教育部重点实验室;
【基金】：江西省重大生态安全问题监控协同创新中心项目(JXS-EW-00) 国家自然科学基金项目(41401031,41371062,41301023)~~
【分类号】：X524
，
本文编号：2384323
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