通榆县开通镇拟建水源地地下水数值模拟及预测

发布时间：2018-04-20 00:16

本文选题：通榆县 + 地下水资源评价　；参考：《吉林大学》2017年硕士论文

【摘要】：近年来,水资源紧缺造成地下水开发利用程度不断提高,尤其是在地下水集中开采区,出现了地下水降落漏斗、地下水环境污染等一系列由于地下水不合理开发利用而引起的环境地质问题。随着社会经济发展进程的加快,地下水资源开发利用的规模也随之越来越大,为了科学管理和合理利用地下水资源,减少因开发地下水而造成的环境地质问题,需加强对地下水资源的评价。通榆县水源地位于开通镇北部,现有水源开采井8眼,主要开采新近系泰康组和大安组承压水。研究区主要有两个含水岩组,即第四系松散岩类孔隙含水岩组,新近系碎屑岩类裂隙孔隙含水岩组。第四系松散岩类孔隙含水岩组又分为孔隙潜水含水岩组和孔隙承压水含水岩组。新近系裂隙孔隙含水岩组分为泰康组和大安组裂隙孔隙承压水含水岩组。本文综合分析开通镇水源地的地质和水文地质条件,确定评价供水目的含水层为新近系承压水,并对新近系承压水的水资源量进行计算和评价,评价结果表明供水目的含水层允许开采量为1.396×104m3/d。在分析研究区地质、水文地质条件的基础之上,建立模拟区水文地质概念模型和相应的数学模型,运用GMS软件对模拟区进行空间离散、源汇项处理及参数分区,以计算地下水水位和观测水位拟合程度为标准,对模型进行识别和验证,反演了研究区水文地质参数。最后,利用验证后的模型对不同开发利用方案的地下水水位变化趋势进行模拟预报,结果表明:本水源地建成运行后,每年按照12000m3/d的开采量开采,供水量满足规划发展需求,同时开采未超过允许开采量范围,方案可行。20年后目标含水层承压水水位下降15m,会对水源地周边生活用水井和灌溉用水井产生影响。本文所建立通榆县开通水源地的地下水数值模拟模型,可为研究区的地下水位动态管理、地下水资源合理开发利用、水源地动态评价提供科学依据。
[Abstract]:In recent years, the degree of groundwater exploitation and utilization has been continuously improved due to the shortage of water resources, especially in the underground water concentrated mining areas, where there has been a groundwater drop funnel. Environmental pollution of groundwater is a series of environmental geological problems caused by unreasonable exploitation and utilization of groundwater. With the acceleration of social and economic development, the scale of groundwater resources development and utilization has become larger and larger. In order to scientifically manage and rationally utilize groundwater resources and reduce the environmental geological problems caused by groundwater exploitation, The evaluation of groundwater resources should be strengthened. The water source of Tongyu County is located in the north of Kaitong Town. There are 8 wells for water source exploitation, which mainly mine confined water of Taikang formation and Da'an formation of Neogene. There are mainly two water-bearing rock groups in the study area, namely, the Quaternary loose rock pore water-bearing rock formation, the Neogene clastic rock fissure pore water-bearing rock formation. The Quaternary loose rock group is divided into pore phreatic water bearing rock group and pore confined water bearing rock group. The pore water bearing rocks of the Neogene fissure are divided into Taikang formation and Da'an formation. In this paper, the geological and hydrogeological conditions of the Ketong water source are analyzed synthetically, and the water resources quantity of the newly confined water is calculated and evaluated by determining the water supply purpose aquifer as Neogene confined water. The results show that the allowable exploitation of the aquifer for water supply purposes is 1.396 脳 10 ~ 4 m ~ (3 / d) 路d. Based on the analysis of the geological and hydrogeological conditions of the study area, the conceptual model of hydrogeology and the corresponding mathematical model of the simulated area are established, and the spatial discretization, source and sink items processing and parameter partition of the simulated area are carried out by using GMS software. Based on the standard of calculating the fitting degree of groundwater level and observed water level, the model is identified and verified, and the hydrogeological parameters of the study area are inversed. Finally, the model is used to simulate and forecast the trend of groundwater level change in different development and utilization schemes. The results show that after the water source is completed and operated, the water supply can meet the planning and development needs every year according to the exploitation rate of 12000m3/d. At the same time, it is feasible to exploit within the allowable exploitation range. After 20 years, the confined water level of the target aquifer will be reduced by 15m, which will have an impact on the domestic water wells and irrigation water wells around the water sources. The numerical simulation model of groundwater in Tongyu county can provide scientific basis for the dynamic management of groundwater level, the rational development and utilization of groundwater resources and the dynamic evaluation of water source.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P641.6

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