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基于Delft3D模型的鄱阳湖水动力模拟研究
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摘要
对湖泊水环境质量进行科学的分析和评价是对其进行有效的规划、治理和管理的基础,对保证社会的可持续发展具有十分重要的意义。应用水动力学模拟模型,对水体的水动力学规律进行分析,是水环境分析的重要基础。本文通过建立湖泊水动力学模型,对湖泊水动力学规律进行模拟研究,从而为湖泊环境规划和管理服务。
     本文选择鄱阳湖作为研究对象,采用的是经典的有限差分法离散所建立的方程组,引入荷兰Delft3D计算软件对研究区域的水动力情况进行了数值计算个模拟。经过与实测资料的比较验证,计算结果符合实际情况,可达到精度要求。
     鄱阳湖是我国第一大淡水湖,也是我国目前比较干净的湖泊之一,但最近几年受人类活动的影响,以及对其资源的过度开发和利用,加上底泥中长期积累的氮、磷元素的释放,鄱阳湖富营养化程度日趋严重,严重影响了湖泊环境,并制约着当地及周边经济的可持续发展。该研究利用鄱阳湖1987年7月15日、1999年12月10日的遥感数据和水文实测数据对其在丰水期和枯水期的水动力特征及变化规律进行了分析。同时,基于国际知名的Delft3D软件平台构建了鄱阳湖水动力数学模型,对鄱阳湖的流场进行了二维数值模拟,着重分析了典型风向不同风速情况下鄱阳湖的水动力变化规律,计算结果与实测资料较为吻合,模型真实可靠。
     文章最后通过模拟和水文实测数据分析表明:鄱阳湖水动力情况具有明显的季节变化特征。在其它因素不变的情况下,典型风向、不同风速对鄱阳湖的流场结构产生了一定的影响。
In order to keep the social development of economy sustainable, it is very important that the water environment quality is analyzed and evaluated rationally, and it is therefore planned, harnessed and managed efficiently. To conduct the water environment analysis, an important basic work is to analyze the hydrodynamic behaviors. The objective of this work is to study the hydrodynamic behavior in lake using hydrodynamic models, and direct way to serve the planning and management for environmental department.
     This paper employs the Alternating Direction Implicit method to discrete the hydrodynamics governing equations for numerical simulation, and obtains the results of hydrodynamics and concentration fields in succession. The Delft3D is introduced in the pro and after process and numerical with measured data, the computed results accord with the reality approximately, the computing accuracy is good enough.
     Poyang Lake, the first Largest Lake in our country, is as well as one of the relatively clean lake. However, due to the influences of human activities, unreasonable exploitive and the release of nitrogen and phosphorus which have accumulated in the bottom mud for a long time, the problem of eutrophicate has increased severely in Poyang Lake, which affected its lake environment seriously and restricted the local social and economic development. The Poyang Lake’Hydrodynamic conditions and changes character have been analyzed by remote sensing and hydrological data from 7.15.1989 and 12.10.1999. Meanwhile, based on the international well-know software Delft3D, the Poyang Lake’Hydrodynamic mathematical model was constructed to simulate the flow field, which focused on analysis of a typical wind speed in different situations the hydrodynamic characteristics of the Poyang Lake’. The calculations were well talked with the measured data, which proved the model was true and credible.
     At last, the analysis of hydrological measured data reveals that the Poyang Lake presents obvious seasonal variety. The results of numerical simulation, in summer and winter, shows that other elements being equal, wind had a certain impact on the flow field structure of the Poyang Lake.
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