日照市傅疃河下游地区地下水资源评价与研究

发布时间：2018-01-26 13:09

本文关键词： 地下水数值模拟地下水资源评价海水入侵　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：傅疃河是日照市海岸带最大的入海河流,其中下游段目前分布有四个地下水水源地,分别为鹅庄水源地、曲河口水源地、丁家楼水源地以及河套水源地,为日照市主要城市饮用水水源地。傅疃河水源地作为日照市海岸带主要饮用水供水水源,虽于80年代初做过地下水资源初步勘查,但随着自然条件的变化、人类活动的加剧,造成地下水资源的减少及地下水环境的恶化,使区域水文地质条件已发生了较大变化。对研究区地下水的不合理开采,研究区出现了局部地下水位降落漏斗、东南沿海海水入侵潜水含水层等地质问题。因此,为了保障傅疃河下游城市的供水安全,同时为保障水资源可持续利用提供科学依据,对日照市傅疃河下游地区地下水资源进行评价和预测有实际意义。本文对日照市傅疃河下游地区进行了地下水资源评价,采用数值法计算补给资源量,同时进行了水质评价。在评价过程中建立了研究区地层三维模型,再结合研究区水文地质条件资料,建立了水文地质概念模型,构建数学模型,而后借助Visual Modflow软件建立区域尺度地下水数值模拟模型,以地下水位观测值和计算值的拟合程度为指标,通过识别验证模型来反演各分区水文地质参数。在上述工作基础上,建立海水入侵过程模型,进行模型正演预报,并提出防治措施,预报评价各情况下海水入侵发展趋势。通过对研究区地下水资源评价和研究得到如下成果:研究区地下水化学特征从补给区到排泄区呈现明显分带性,水质类型为HCO3-Ca型、HCO3-Ca·Na型、HCO3·Cl—Ca·Na型、HCO3·Cl—Na型、Cl—Na型。地下水流模型计算得到的现状年地下水补给资源量为1.601?105 m3/d,其中大气降水补给为8.057?104m3/d,地下水排泄量为1.491?105 m3/d,其中人工开采量为5.30?104m3/d,研究区地下水系统处于正均衡。利用地下水模型预测三个方案得到相应地下水流场动态变化和海水入侵发展趋势,其中方案三预测在崮河汇入傅疃河处设置拦河坝方案,通过增加地表水位,间接提高地下水位以减缓研究区东南沿海水产养殖区海水入侵速度。预报结果显示,设置拦河坝只能减缓海水入侵问题但不能根本解决问题,解决办法是控制沿海地区地下水的开采,合理利用地下水资源。
[Abstract]:Futuan River is the largest river in the coastal zone of Rizhao City. There are four groundwater sources in the lower reaches, namely, Gezhuang water source, Quhekou water source, Dingjialou water source and Hetao water source. As the main drinking water source in the coastal zone of Rizhao City, the Futuan River water source is the primary source of drinking water in Rizhao City. Although the groundwater resources were preliminarily surveyed in 80s, they change with the change of natural conditions. With the aggravation of human activities, the reduction of groundwater resources and the deterioration of groundwater environment have resulted in great changes in regional hydrogeological conditions and unreasonable exploitation of groundwater in the study area. In the study area, there are some geological problems, such as local groundwater level falling funnel, sea water intrusion into diving aquifer and other geological problems. Therefore, in order to ensure the safety of water supply in the lower reaches of Futuan River. At the same time, it provides the scientific basis for ensuring the sustainable utilization of water resources. It is of practical significance to evaluate and predict the groundwater resources in the lower reaches of Futuan River in Rizhao City. In this paper, the groundwater resources in the lower reaches of Futuan River in Rizhao City are evaluated, and the amount of recharge resources is calculated by numerical method. At the same time, the water quality was evaluated. In the process of evaluation, the stratigraphic 3D model of the study area was established, and then the hydrogeological concept model was established and the mathematical model was constructed by combining the hydrogeological condition data of the study area. Then the regional scale groundwater numerical simulation model is established with the help of Visual Modflow software, and the fitting degree between the observed and calculated groundwater level is taken as the index. Based on the above work, the seawater intrusion process model is established, the forward prediction of the model is carried out, and the prevention measures are put forward. Through the evaluation and study of groundwater resources in the study area, the following results are obtained: the chemical characteristics of groundwater in the study area are obviously zoned from recharge area to discharge area. The type of water quality is HCO3-Ca type, HCO3-Ca 路Na type, HCO3 路Cl-Ca 路Na type, HCO3 路Cl-Na type. Cl-Na model. Groundwater recharge resources calculated by groundwater model is 1. 601? 105 m3 / d, of which 8.057? 104m3 / d, groundwater discharge is 1.491? 105 m3 / d, of which 5.30? The groundwater system in the study area is in a positive equilibrium at 104 m3 / d. The groundwater model is used to predict the dynamic change of groundwater flow field and the trend of seawater intrusion. Among them, the third project predicts the establishment of the blocking dam scheme at the point where the Gushan River flows into the Futuan River. By increasing the surface water level, indirectly raising the groundwater level to slow down the sea water intrusion in the southeast coastal aquaculture area of the study area, the forecast results show that. The problem of sea water intrusion can only be alleviated but the problem can not be solved by setting blocking dam. The solution is to control the exploitation of groundwater in coastal areas and make rational use of groundwater resources.
【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】：P641.8

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