相关系数极值法在地下水溶质运移模拟中的应用研究
发布时间：2019-02-08 16:39
【摘要】：近些年来,在社会快速发展的同时,污水的过度排放对环境造成了极其严重的破坏,同时也致使地下水受到了污染,这对大空间尺度和长时间跨度的地下水溶质运移的分析预测提出了需求。本文以某工业园区氨水泄漏污染地下水为例,建立水文地质概念模型和数学模型,然后利用相关系数极值法对该区地下水弥散试验数据进行分析,并将所得弥散参数用于地下水模拟软件GMS中,对氨的扩散做出预测。本文主要成果如下：1、在分析水文地质条件、地下水的赋存条件等的基础上,确定了项目区地下水类型,按含水介质及埋藏条件划分为第四系松散堆积砂砾卵石层孔隙潜水和白垩系基岩裂隙水两种类型,其中以松散堆积砂砾卵石层孔隙潜水为主。并将含水层自上而下分为透水层、弱透水层和相对隔水层。2、通过对项目区水文地质条件的分析,对模拟区域进行概化。通过野外抽水试验和注水试验资料,给出了水文地质参数初值,然后将参数带入到模型中,通过调参,最终确定了比较符合实际的水文地质参数。3、利用查阅文献所得计算弥散系数的相关系数极值法,将通过野外弥散试验获得的示踪剂浓度-时间数据进行分析计算,算得四个相关弥散参数,分别为地下水流速,有效孔隙率,纵向和横向弥散度。4、将所得弥散参数代入模拟软件进行溶质运移模拟。根据模拟结果可知,渗入地下水中的氨主要向东南方向迁移；并随着时间推移,扩散范围逐渐扩大,在地下水径流作用下,纵向上的迁移范围明显大于横向,在地下水流下游污染物范围明显大于上游,并在氨水泄漏14年后,污染范围将进入附近水系。
[Abstract]:In recent years, with the rapid development of society, the excessive discharge of sewage has caused extremely serious damage to the environment and caused the pollution of groundwater. It is necessary for the analysis and prediction of groundwater solute transport on large spatial scale and long time span. Taking the groundwater polluted by ammonia leakage in an industrial park as an example, a hydrogeological conceptual model and a mathematical model are established, and then the dispersion test data of groundwater in this area are analyzed by using the correlation coefficient extreme value method. The dispersion parameters are used in the groundwater simulation software GMS to predict the diffusion of ammonia. The main achievements of this paper are as follows: 1. Based on the analysis of hydrogeological conditions and groundwater occurrence conditions, the types of groundwater in the project area are determined. According to the water bearing medium and burial conditions, there are two types of pore phreatic water in the Quaternary loosely deposited gravel layer and the Cretaceous bedrock fissure water, among which the pore phreatic water of loose accumulated sand gravel layer is the main one. The aquifer is divided from top to bottom into permeable layer, weak permeable layer and relative waterproof layer. 2. Through the analysis of hydrogeological conditions in the project area, the simulated area is generalized. Based on the data of field pumping test and water injection test, the initial values of hydrogeological parameters are given, and then the parameters are brought into the model. By adjusting the parameters, the hydrogeological parameters, which are in accordance with the actual conditions, are finally determined. By using the correlation coefficient extreme value method of calculating dispersion coefficient obtained from literature, the tracer concentration and time data obtained from field dispersion test were analyzed and calculated, and four related dispersion parameters were calculated, respectively, as groundwater velocity. Effective porosity, longitudinal and transverse dispersion. 4. The obtained dispersion parameters are substituted into the simulation software for solute migration simulation. According to the simulation results, the ammonia infiltrated into the groundwater mainly migrated to the southeast. With the passage of time, the diffusion range gradually expanded. Under the action of groundwater runoff, the longitudinal migration range was obviously larger than that of transverse, and the range of pollutants in the downstream of groundwater flow was obviously larger than that of upstream, and after 14 years of ammonia leakage, the range of pollutants in the lower reaches of groundwater was obviously larger than that in upstream. The contaminated area will enter the nearby water system.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X523
本文编号：2418558
[Abstract]:In recent years, with the rapid development of society, the excessive discharge of sewage has caused extremely serious damage to the environment and caused the pollution of groundwater. It is necessary for the analysis and prediction of groundwater solute transport on large spatial scale and long time span. Taking the groundwater polluted by ammonia leakage in an industrial park as an example, a hydrogeological conceptual model and a mathematical model are established, and then the dispersion test data of groundwater in this area are analyzed by using the correlation coefficient extreme value method. The dispersion parameters are used in the groundwater simulation software GMS to predict the diffusion of ammonia. The main achievements of this paper are as follows: 1. Based on the analysis of hydrogeological conditions and groundwater occurrence conditions, the types of groundwater in the project area are determined. According to the water bearing medium and burial conditions, there are two types of pore phreatic water in the Quaternary loosely deposited gravel layer and the Cretaceous bedrock fissure water, among which the pore phreatic water of loose accumulated sand gravel layer is the main one. The aquifer is divided from top to bottom into permeable layer, weak permeable layer and relative waterproof layer. 2. Through the analysis of hydrogeological conditions in the project area, the simulated area is generalized. Based on the data of field pumping test and water injection test, the initial values of hydrogeological parameters are given, and then the parameters are brought into the model. By adjusting the parameters, the hydrogeological parameters, which are in accordance with the actual conditions, are finally determined. By using the correlation coefficient extreme value method of calculating dispersion coefficient obtained from literature, the tracer concentration and time data obtained from field dispersion test were analyzed and calculated, and four related dispersion parameters were calculated, respectively, as groundwater velocity. Effective porosity, longitudinal and transverse dispersion. 4. The obtained dispersion parameters are substituted into the simulation software for solute migration simulation. According to the simulation results, the ammonia infiltrated into the groundwater mainly migrated to the southeast. With the passage of time, the diffusion range gradually expanded. Under the action of groundwater runoff, the longitudinal migration range was obviously larger than that of transverse, and the range of pollutants in the downstream of groundwater flow was obviously larger than that of upstream, and after 14 years of ammonia leakage, the range of pollutants in the lower reaches of groundwater was obviously larger than that in upstream. The contaminated area will enter the nearby water system.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X523
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