丘陵地区水库坝址方案选择对地下水环境影响研究

发布时间：2018-05-26 19:39

本文选题：水库坝区 + 概化模型　；参考：《西南交通大学》2014年硕士论文

【摘要】：水库坝区渗漏不但可能导致危害性渗透破坏而影响大坝的安全稳定性,还会改变河流的基本特征和下游河道的水文情势,并且会对周边地下水环境产生影响。因此,需要提前预测并考虑地下水渗流所产生的影响,对所选坝址方案进行验证,使坝址方案更加合理、有效。油房沟水库为一综合用水的水利工程,工程地点位于仪陇县北部毗邻巴中地区的日兴镇附近,坝址位于油房沟上游河源地带三叉河汇口下游的友谊桥,正常蓄水位406.00m,设计洪水位406.09m,校核洪水位407.64m,死水位395.00m,其开发任务是农田灌溉、乡镇生产生活用水和农村人畜饮水。本论文以丘陵地区油坊沟水库坝址区选择作为研究对象,首先对其进行地质环境调查,包括地形地貌、地层岩性及地质构造等；其次研究坝区地下水类型、含水层富水性、地下水补给排泄条件及化学特征等水文地质条件。在此基础上,建立地下水系统概念模型,并概化模型边界,同时建立地下水系统数值模型并验证。在建立数值模型的基础上利用Visual MODFLOW软件对水库蓄水后坝址区地下水流场进行预测计算,分析地下水渗流场的变化以及对周边地下水环境的影响。之后,对模拟计算出的地下水渗流对坝址周边地下水环境影响进行对比分析,得出不同坝址选择的环境影响。最后通过对比分析结果,从地下水环境影响的角度验证坝址选择的合理性。
[Abstract]:The leakage of reservoir dam area can not only cause harmful seepage damage and affect the safety and stability of dam, but also change the basic characteristics of the river and the hydrological situation of the downstream river channel, and will also have an impact on the surrounding groundwater environment. Therefore, it is necessary to predict and consider the influence of groundwater seepage in advance and verify the selected dam site scheme to make the dam site scheme more reasonable and effective. Yefanggou Reservoir is a comprehensive water conservancy project, located near Rixing Town in the northern part of Yilong County adjacent to the Bazhong area. The dam site is located at the Friendship Bridge in the lower reaches of the Sancha River Huikou in the headwaters of the upstream Yilianggou River. The normal storage water level is 406.00 m, the design flood water level is 406.09 m, the check flood water level is 407.64 m, the dead water level is 395.00 m.The development task is farmland irrigation, township production and living water and rural people and livestock drinking water. In this paper, the selection of dam site of Youfanggou reservoir in hilly area is taken as the research object. Firstly, geological environment investigation is carried out, including topography, geomorphology, stratigraphic lithology and geological structure, and then the type of groundwater in the dam area is studied, and the aquifer is rich in water. Hydrogeological conditions such as recharge and discharge of groundwater and chemical characteristics. On this basis, the conceptual model of groundwater system is established, and the boundary of the model is generalized. At the same time, the numerical model of groundwater system is established and verified. Based on the numerical model, Visual MODFLOW software is used to predict and calculate the groundwater flow field in the dam area after reservoir impoundment, and the variation of groundwater seepage field and its influence on the surrounding groundwater environment are analyzed. After that, the effects of groundwater seepage on the groundwater environment around the dam site are compared and analyzed, and the environmental effects of different dam site selection are obtained. Finally, the rationality of dam site selection is verified from the point of view of groundwater environmental impact.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV221.2;P641

【参考文献】