鄱阳湖的水温分层现象与水利枢纽工程影响下水龄的研究

发布时间：2018-05-05 11:34

本文选题：鄱阳湖 + EFDC模型　；参考：《南昌大学》2017年硕士论文

【摘要】：作为江西省最重要的湖泊、同时也是长江中下游的第一大湖,鄱阳湖优良的水环境对维护鄱阳湖湖域乃至整个长江流域的生态安全方面极为重要。近些年,随着流域社会经济的快速发展,人类对水资源的需求量日益增大,使得鄱阳湖水域面积逐年缩小,枯水期加重且持久,为了改变这一现状解决湖域安全用水问题,江西省再次将建设鄱阳湖水利枢纽工程提上议程。因此,鄱阳湖水环境的深入研究以及新增水利枢纽工程对水环境、特别是对鄱阳湖与长江的江湖连续性的影响评估,具有重要的理论和现实意义,其中水温分布和水龄变化是重要的两个方面。本文运用EFDC建立鄱阳湖模型模拟了鄱阳湖湖区的水体温度分布及水利枢纽工程对湖泊水龄的影响。主要研究结论为:(1)鄱阳湖水温在平面上春冬季东高西低,夏季西高东低;水温在垂向上存在分层现象,沿着由北向南、自西向东方向增强,且主要存在于夏秋高温、高水位期的中央湖区、东北湖湾。由于鄱阳湖水温分层现象的时间短、范围有限,整体属于混合型分布,其分层现象与水位、湖流、地形、江湖作用和太阳辐射等因素相关。(2)鄱阳湖东北湖湾、南部湖滩缺乏水动力驱动,较全湖水体交换性差,水龄大,但在长江顶托倒灌作用下,该区域水体能在短期内得到较好的交换,水龄减小。鄱阳湖水利枢纽工程基本不改变鄱阳湖的水动力变化过程和水力特征,但会使其坝址以上的通江河道区域和中心湖区的水龄增大。以上明确具体的结果,可为鄱阳湖水环境的治理改造提供一定的理论参考。
[Abstract]:As the most important lake in Jiangxi Province and the largest lake in the middle and lower reaches of the Yangtze River, the excellent water environment of Poyang Lake is very important to maintain the ecological security of Poyang Lake region and the whole Yangtze River Basin. In recent years, with the rapid development of the basin economy, the human demand for water resources is increasing day by day, which makes the area of Poyang Lake water area shrink year by year, and the dry season is aggravated and lasting. In order to change this situation, the problem of safe water use in the lake region is solved. Jiangxi Province will once again build Poyang Lake water conservancy project on the agenda. Therefore, it is of great theoretical and practical significance to study the water environment of Poyang Lake and to evaluate the impact of the new water conservancy project on the water environment, especially on the continuity of Poyang Lake and Yangtze River. The distribution of water temperature and the variation of water age are two important aspects. In this paper, EFDC is used to establish Poyang Lake model to simulate the distribution of water temperature in Poyang Lake region and the influence of water conservancy project on water age of the lake. The main conclusions are as follows: (1) the water temperature of Poyang Lake is high and low in spring and winter and low in summer and summer, and the water temperature is stratified vertically, increasing from north to south, from west to east, and mainly in summer and autumn. High-level central lake area, northeast lake bay. Because of the short time and limited range of water temperature stratification in Poyang Lake, the whole is a mixed distribution. The stratification phenomenon is related to water level, lake flow, topography, river and lake action and solar radiation. The southern lake beach is lack of hydrodynamic drive, which is less exchangeable than the whole lake water body, and the water age is longer. However, under the action of upside-down irrigation on the top of the Yangtze River, the water body in this area can be exchanged well in a short period of time, and the water age decreases. The hydrodynamic variation process and hydraulic characteristics of Poyang Lake are basically not changed in Poyang Lake Water Control Project, but the water ages of the Tongjiang River region and the central lake area above the dam site will be increased. The above specific results can provide a theoretical reference for the improvement of water environment in Poyang Lake.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P341;TV61

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