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引用本文:赖锡军,姜加虎,黄群,徐力刚.鄱阳湖二维水动力和水质耦合数值模拟.湖泊科学,2011,23(6):893-902. DOI:10.18307/2011.0611
LAI Xijun,JIANG Jiahu,HUANG Qun,XU Ligang.Two-dimensional numerical simulation of hydrodynamic and pollutant transport for Lake Poyang. J. Lake Sci.2011,23(6):893-902. DOI:10.18307/2011.0611
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鄱阳湖二维水动力和水质耦合数值模拟
赖锡军, 姜加虎, 黄群, 徐力刚
中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008
摘要:
针对大型通江湖泊水位变化剧烈, 地形起伏多变, 岸线复杂, 湖泊内部窄小洪道与大面洲滩和洼地连接复杂, 湖泊洲滩出露、淹没频繁交替等湖泊水情和地貌特征, 基于二维浅水方程和对流扩散方程组构建了鄱阳湖二维水动力和水质耦合模拟模型.模型采用非结构网格有限体积法进行离散, 以HLLC算法计算单元界面的水量、动量和物质输运通量.水陆边界通过水深自动判别, 为湖泊洲滩出露、淹没过程的模拟提供了合理有效的途径.该模型适合于模拟鄱阳湖这类水陆界面动态变化极为显著的湖泊中的水流运动及其物质输运过程.在1998年全年水情率定的基础上, 计算了2008年1-10月的水动力和水质(高锰酸盐指数和氨氮两个指标)时空分布.并用实测水位、高锰酸盐指数和氨氮浓度过程数据以及遥测水域范围等, 从时间过程和空间分布上检验了鄱阳湖模型的可靠性.鄱阳湖耦合模型克服了这类复杂水域水动力及其物质输运过程模拟的困难, 为相关应用提供了参考。
关键词:  水动力  水质  数学模型  非结构网格  鄱阳湖
DOI:10.18307/2011.0611
分类号:
基金项目:中国科学院知识创新工程重大项目(KZCX1-YW-08-01);国家自然科学基金项目(50709034)联合资助
Two-dimensional numerical simulation of hydrodynamic and pollutant transport for Lake Poyang
LAI Xijun, JIANG Jiahu, HUANG Qun, XU Ligang
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P.R.China
Abstract:
The present study aims to develop a mathematical model for analyzing and predicting the hydrodynamic and water quality in one large lake (Lake Poyang) with great and rapid stage fluctuation, the complex topography and geometry, the complicated connectivity of narrow channels and depressions inside the lake, the frequently switch between exposed grass beach and water.Based on the two-dimensional shallow water equations and pollutant transport equations, the coupled two-dimensional hydrodynamic and pollutant transport model is developed.The unstructured finite volume method is applied to discretize the equations.The nor-mal water mass, momentum and pollutant fluxes are computed by the HLLC solver.The water front moving boundary is identified automatically by the judgment of the latest water stage.It makes the model be capable of simulating the complex flow regime and the dynamic of pollutant transport in the lake with drying and wetting processes.The hydrodynamic model is calibrated by the water regime of the year 1998.Based on the calibrated hydraulic parameters, the hydrodynamic and water quality (CODMn and ammo-nia) from January to October in 2008 are simulated by the proposed model.The time series data of measured water stage, CODMn and ammonia, and remotely water extent of CBERS data are both used to validate the results of computation in time and space.The results indicate that the model has the capability to model the flows dynamic and the pollutant transport in this kind of lake.
Key words:  Hydrodynamics  water quality  mathematical model  unstructured grids  Lake Poyang
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