黄河谷地大会坪水源地地下水资源开发模式研究

发布时间：2018-03-11 07:32

本文选题：大会坪水源地　切入点：渗流井　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：佳县位于榆林市东南部，黄河中游陕晋峡谷右岸。近年来，县域经济大力发展，佳县确立了以红枣和岩盐“一红一白”为主的经济发展战略，但是水资源不足的状况严重制约了当地经济的发展，榆佳工业园区的规划与建设更凸显了水资源短缺的问题。建设大会坪水源地解决当地难题已经迫在眉睫。大会坪水源地位于佳县黄河右岸，含水层以第四系松散砂卵石层和下伏第三系基岩风化裂隙层为主，透水性强，地下水补给条件较好，具备水资源开发条件。实践证明，不同的水资源开发模式将产生不同的取水效益。本文旨在运用数值模拟计算，优选一种适合大会坪水源地的开采模式。大会坪水源地为一典型的傍河水源地，国内外对于傍河地下水开采主要采取四种常见模式，包括管井开采，廊道开采，辐射井开采以及渗流井开采。以上开发模式各有利弊，本文在充分了解研究区自然地理、工程地质和水文地质概况的基础上，建立了管井取水工程的二维有限差分数值模型，同时以“渗流—管流耦合模型”理论为基础，建立廊道、辐射井和渗流井取水工程的三维有限差分数值模型，通过对各取水建筑物不同方案下出水量计算结果的对比分析，确定各个开采方式的最佳开采方案。然后在各方案中，综合考虑取水量、水质、取水保证度等因素，选取渗流井作为大会坪水源地地下水资源开采模式。优选方案为布设5眼五硐室渗流井，井间距500米，允许开采量为27800.00m3/d，并在此方案基础上，，利用数值模型分别计算流域水库调度及河床淤积对水源地取水量的影响；综合考虑取水工程建成后，相关因素对水质、水量的影响，对水源地建成后的科学开采提出可行的建议，以保证水源地取水工程长期平稳运行。
[Abstract]:Jiaxian is located in the southeast of Yulin City, on the right bank of Shan-Jin Canyon in the middle reaches of Yellow River. In recent years, the county economy has developed vigorously, and Jiaxian has established an economic development strategy based on red jujube and rock salt "one red and one white". However, the shortage of water resources seriously restricts the development of local economy, and the planning and construction of Yujia Industrial Park highlight the problem of water shortage. The Yiping water source is located on the right bank of the Yellow River in Jiaxian County. The aquifer is mainly composed of the Quaternary loose sandy cobblestone layer and the underlying Tertiary bedrock weathering fissure layer, with strong permeability and good groundwater recharge conditions. Different water resources development models will produce different water intake benefits. The purpose of this paper is to use numerical simulation to select a suitable mining model for the Yiping water source area. The Huiping water source area is a typical riverside water source. Four common models are adopted for groundwater exploitation along the river at home and abroad, including pipe well mining, corridor mining, radiation well mining and seepage well mining. The above development models have their own advantages and disadvantages. On the basis of fully understanding the natural geography, engineering geology and hydrogeology of the study area, a two-dimensional finite difference numerical model of water intake engineering for pipe wells is established in this paper. At the same time, the corridor is established on the basis of the theory of "seepage and pipe flow coupling model". Three-dimensional finite difference numerical model of water intake engineering of radiation well and percolation well, through comparing and analyzing the calculation results of water output under different schemes of each water intake building, the optimum exploitation scheme of each mining method is determined. Considering the factors such as water intake, water quality and water intake assurance, the seepage well is selected as the groundwater resource exploitation model in Yeping water source area. The optimal selection scheme is to set up 5 five chamber seepage wells with a spacing of 500 meters. The allowable extraction capacity is 27800.00m3 / d, and on the basis of this scheme, the effects of reservoir operation and siltation of river bed on the water intake from the water source are calculated by using the numerical model, and the influence of relevant factors on water quality and quantity is considered synthetically after the completion of the water intake project. Some feasible suggestions on scientific exploitation of water source are put forward to ensure the steady operation of water intake project for a long time.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P641.8

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