摘要
针对内蒙古乌梁素海面临的污染现状,基于三维环境流体动力学模型(EFDC)的计算模式,将其与CE-QUAL-ICM模型耦合,模拟了不同情景下的乌梁素海藻类、总氮、总磷、化学需氧量年际和季节变化规律,模型中不仅考虑了风速和蒸发对模型的影响,也加入了挺水植物密度、高度、直径等形态指标,以此反映水生植物存在的区域中植物吸收降解污染物质、风速对底部应力、流场变化等因素对模型模拟结果的影响。研究结果表明:考虑挺水植物分布的耦合模型能够很好的模拟藻类和污染物质在乌梁素海内的年际、季节变化过程,模拟结果更接近于实际,模拟值与实测值间的相对误差基本控制在30%以内,大部分相对误差已控制在20%以内;降低入湖污染物质负荷直接影响着湖区内水质浓度的变化。另外,对于浅水或挺水植物密集而无法进入取得信息的区域,利用所建耦合模型能够为这些区域湖泊规划、管理、修复提供依据。
The problems of salinization,organic pollution and eutrophication are very severe in the Wuliangsuhai Lake.In this paper,a coupled model was built based on Environmental Fluid Dynamics Code（EFDC） model and three-dimensional eutrophication（CE-QUAL-ICM） model,with considering the various meteorological factors and the form indicators of emergent plants（e.g.density,height,diameter etc）,.This model can reasonably reflect the effects of absorption and degradation of polluting substances by aquatic plants,the bottom stress change and the flow field change.Then the coupled model was applied to predict the inter-annual and seasonal changes of algae,total nitrogen,total phosphorus and chemical oxygen demand with different scenarios in the Wuliangsuhai Lake.Results indicated that the model can well describe the inter-annual and seasonal changes of water quality model when considering the effects of emergent plants.Simulation results were close to the measured ones,with relative error less than 30% and most of absolute error less than 20%.Reducing the pollutant load into the lake directly affected the changes of water quality in the lake.In addition,it is difficult to obtain the information of water quality in water area with shallow and dense emergent plants.However,the use of the coupled model can solve this problem and provide the basis for reasonable planning and management in these areas.
出处
《生态学报》
CAS
CSCD
北大核心
2013年第13期3987-3994,共8页
Acta Ecologica Sinica
基金
国家自然科学基金项目(51069009)
内蒙古自治区科技创新引导奖励资金项目
内蒙古自然科学基金面上项目(2012MS0621)
乌梁素海湿地生态系统恢复与重建关键技术研究与示范(2011BAC02B03)
内蒙古师范大学科研基金项目(KYZR1117)
关键词
乌梁素海
环境流体动力学模型
水质变化
数值模拟
Wuliangsuhai Lake
environmental fluids dynamics model
Change of water quality
numerical simulation
