【作者】 安莉娜；

【导师】 汪德爟；

【作者基本信息】 河海大学 ， 环境工程， 2005， 硕士

【摘要】 城市浅水湖泊作为城市基础设施的组成部分，在城市生态环境中起着重要的作用。随着城市化进程的加快，城市浅水湖的水环境不断恶化，湖泊水环境治理刻不容缓。开展城市湖泊水环境整治规划是指导水环境治理的前提和关键，而湖泊水环境模拟研究是规划中的一个重要技术手段。 本文针对城市浅水湖泊富营养化加剧现状，结合WASP5模型中有关氮和磷的循环机理，并将该机理写入已有的二维浅水流体水量模型中加以耦合，应用在无结构网格下的有限体积法与黎曼近似解求解的方法，求解湖泊在外驱动作用下的湖泊水动力和水质因子氮和磷的变化。 本文以玄武湖为研究对象，模拟湖泊水动力变化特征以及富营养化因子的变化模拟。在对模型进行合理分析后，分别实施了三种引水方案，从各个方案的模拟结果可以看出，玄武湖富营养盐(总氮、总磷)的浓度在经过各种引水的条件下的浓度较引水前有所降低。 为了进一步研究，在确定一个最好的引调水方案后，将引水能力加大，以研究加大进水量条件下的玄武湖的总磷、总氮的浓度变化情况；另外，还研究了风场对玄武湖的总氮、总磷的浓度变化的影响。更多还原

【Abstract】 As one of the components of the basic establishments, shallow lake plays an important role in the construction of ecological environment in the cities. With the development of urbanization, the aquatic environment of shallow lake has become worse and worse. Therefore, it is high time to take some measures to amend the aquatic environment. There are many plans in improvement of the aquatic environment. Among of them, simulation of the aquatic environment is an important measure.In this paper, two dimensional shallow flow—pollutants coupled model, which applies uninstructed grid finite volume method and Riemann approximate solver, is used to gain the trend of hydrodynamics and water quality(TN and TP) change under the condition of driving force. Mechanism of nitrogen and phosphorous circle of WASP5 is considered in the water quality part of the model according to nutrition actuality of shallow lake in the cities.Xuanwu Lake is object of research in this paper. Moreover, the change characteristics of hydrodynamics and nutritional facts of Xuanwu Lake are simulated in terms of three transportation schemes. As can be Seen from the results , the relative fall of nitrous concentration and phosphoric concentration, are educed after that all simulate figures are analyzed rationally.The change trend of hydrodynamics and water quality(TN、 TP)is researched under the condition of driving force both increased transportation water and wind field considered in order to farther research.更多还原