本文選題：鄱陽(yáng)湖 + EFDC模型��； 參考：《南昌大學(xué)》2017年碩士論文

【摘要】：作為江西省最重要的湖泊、同時(shí)也是長(zhǎng)江中下游的第一大湖,鄱陽(yáng)湖優(yōu)良的水環(huán)境對(duì)維護(hù)鄱陽(yáng)湖湖域乃至整個(gè)長(zhǎng)江流域的生態(tài)安全方面極為重要。近些年,隨著流域社會(huì)經(jīng)濟(jì)的快速發(fā)展,人類對(duì)水資源的需求量日益增大,使得鄱陽(yáng)湖水域面積逐年縮小,枯水期加重且持久,為了改變這一現(xiàn)狀解決湖域安全用水問題,江西省再次將建設(shè)鄱陽(yáng)湖水利樞紐工程提上議程。因此,鄱陽(yáng)湖水環(huán)境的深入研究以及新增水利樞紐工程對(duì)水環(huán)境、特別是對(duì)鄱陽(yáng)湖與長(zhǎng)江的江湖連續(xù)性的影響評(píng)估,具有重要的理論和現(xiàn)實(shí)意義,其中水溫分布和水齡變化是重要的兩個(gè)方面。本文運(yùn)用EFDC建立鄱陽(yáng)湖模型模擬了鄱陽(yáng)湖湖區(qū)的水體溫度分布及水利樞紐工程對(duì)湖泊水齡的影響。主要研究結(jié)論為:(1)鄱陽(yáng)湖水溫在平面上春冬季東高西低,夏季西高東低;水溫在垂向上存在分層現(xiàn)象,沿著由北向南、自西向東方向增強(qiáng),且主要存在于夏秋高溫、高水位期的中央湖區(qū)、東北湖灣。由于鄱陽(yáng)湖水溫分層現(xiàn)象的時(shí)間短、范圍有限,整體屬于混合型分布,其分層現(xiàn)象與水位、湖流、地形、江湖作用和太陽(yáng)輻射等因素相關(guān)。(2)鄱陽(yáng)湖東北湖灣、南部湖灘缺乏水動(dòng)力驅(qū)動(dòng),較全湖水體交換性差,水齡大,但在長(zhǎng)江頂托倒灌作用下,該區(qū)域水體能在短期內(nèi)得到較好的交換,水齡減小。鄱陽(yáng)湖水利樞紐工程基本不改變鄱陽(yáng)湖的水動(dòng)力變化過程和水力特征,但會(huì)使其壩址以上的通江河道區(qū)域和中心湖區(qū)的水齡增大。以上明確具體的結(jié)果,可為鄱陽(yáng)湖水環(huán)境的治理改造提供一定的理論參考。
[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.
【學(xué)位授予單位】：南昌大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P341;TV61

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本文編號(hào)：1847532