某河流改线工程引起地下水流场变化的数值模拟研究

发布时间：2018-05-15 10:27

本文选题：河流改线 + 地下水　；参考：《河北工程大学》2015年硕士论文

【摘要】：河流在城市发展中发挥重要作用。随着城市化的进程,政府基于景观、生态、环境、经济等因素的考量,对不少河流进行改线。改线工程会给当地带来不少生态、经济利益;同时,改线工程破坏了原始的地层结构,毫无疑问会引起其周围地下水流场的变化,在一定程度上改变水文地质条件。本文基于某一河流改线工程实例,分析了不同改线方案对地下水流场的影响,探讨了对地下水流场影响最小的河流改线方案确定方法。以改线工程对周边地下水流场的影响为着眼点,首先调查分析了研究区域的地质、水文地质条件,将研究区域潜水层概化成非均质、各向同性介质、非稳定的二维水流,构建了水文地质概念模型。在概念模型的基础上,建立了数学模型,借助Visual MODFLOW软件求解了该研究区域的地下水流数值模型。并对数学模型进行了识别和验证。其次,分析探讨了改线工程长度、是否建设护岸护底工程对地下水流场的影响问题。研究结果表明:当改线工程采取护岸护底且改线工程长度越大,对地下水流场的影响越大,改线工程运营时间越长,对地下水流场的影响越小,当改线工程运营5年后,改线工程对地下水流场的影响可以忽略。最后,分析了改线工程施工引起地下水流场的变化,研究了对地下水流场影响较小的基坑降水方案的确定方法。本研究成果对流域的生态环境保护、旅游资源开发具有积极的指导意义。
[Abstract]:Rivers play an important role in urban development. With the process of urbanization, the government reroutes many rivers based on landscape, ecology, environment, economy and other factors. It will bring a lot of ecological and economic benefits to the local area, and at the same time, it will destroy the original formation structure, which will undoubtedly cause the change of the groundwater flow field around it, and change the hydrogeological conditions to a certain extent. Based on an example of a river rerouting project, this paper analyzes the influence of different alignment schemes on the groundwater flow field, and discusses the determination method of the river alignment scheme, which has the least influence on the groundwater flow field. Focusing on the influence of the realignment project on the surrounding groundwater flow field, the geological and hydrogeological conditions of the study area are investigated and analyzed, and the submersible beds in the studied area are converted into heterogeneous, isotropic and unstable two-dimensional flows. The concept model of hydrogeology is constructed. Based on the conceptual model, the mathematical model is established, and the numerical model of groundwater flow in the studied area is solved by Visual MODFLOW software. The mathematical model is identified and verified. Secondly, the influence of the length of the realignment project and the construction of the revetment base on the groundwater flow field is analyzed. The results show that the longer the length of the realignment project, the greater the influence on the groundwater flow field, and the longer the operation time, the less the influence on the groundwater flow field. The influence of the realignment project on the groundwater flow field can be neglected. Finally, the variation of groundwater flow field caused by the construction of the modified line engineering is analyzed, and the method of determining the dewatering scheme of foundation pit with less influence on the groundwater flow field is studied. The results of this study have positive guiding significance for the ecological environment protection and tourism resources development of the river basin.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P641.2

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