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Although the natural permeability of rocks in the Asturian Central Coal Basin (NW Spain) is generally low, intensive mining activities over many decades has given rise to fracture flow paths that are far more permeable than those associated with the natural lithology. Abandoned and flooded mining works set up artificial ‘pseudo‐karst’ aquifers, which can act as underground reservoirs, with many potential applications. In particular, a mining reservoir shaped by two connected mining shafts within the River Turón basin has been studied. A runoff model was used to produce accurate simulations of streamflow in three different gauging stations during a monitored period of 2 years. The purpose was to use this model in the forecast situation, in order to predict long‐term situations in a hydrogeological FEFLOW model. It was necessary to develop depletion curves for each gauging station based on the available daily effective rainfall and measured flow data, as well as the knowledge of the basin characteristics. The resulting simulated hydrographs were very similar to the measured hydrographs during the monitored period, so the adequate adjusting allows input of the flow for forecast purposes. The model produced forecast hydrographs that had a r = 0.8 and difference in annual volume ranging from 1.6% to 5%. The defined model was applied to a rainfall data set of 30 years, and the average recharge from the river to the mining reservoir could be adequately estimated. The method developed needs to be refined and tested on additional years, but the approach appears to be applicable to operational runoff forecasting for numerical models input data. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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运用FEFLOW有限元地下水模拟软件,对某条件下地下水环境进行了评价研究。根据水文地质条件、地质条件,建立了数学模型以及水文地质概念模型,利用FEFLOW数值模拟软件研究了地下水流场、分层的均衡性、潜水埋深、潜水水位,研究得出:在矿井开采与某水源开采的条件下,形成了以某水源地为中心的大范围降落漏斗,从而造成潜水位下降程度相近;矿井抽水造成的潜水位下降和水源地抽水影响相比并不明显;2种方式的开采造成潜水埋深大幅度增加,导致了评价区域内潜水获得的蒸发量和大气降水入渗补给量明显降低,研究为类似工程条件下地下水环境影响评价提供一定的借鉴意义。 相似文献
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为了提高复杂断层矿区地下水数值模拟结果的准确度,以内蒙古某矿区错综分布的10条倾斜断层为研究对象,采用FEFLOW软件将倾斜断层简化处理为垂直透水断层,建立复杂断层矿区地下水三维数值模型,并预测了矿区开采30年后对上覆各含水层的破坏程度。结果表明:二叠系山西组砂岩裂隙含水层受开采直接影响,最大降深约150.23 m;上覆二叠系石盒子组砂岩裂隙含水层和新近系砂砾石含水层无稳定隔水层,水位差的加剧导致越流量增加,最大降深约23 m;第四系松散孔隙含水层由于下部完整且较厚的黏土层,基本上不受影响。对断层的有效概化有助于提高数值模型的仿真性和结果的精准度。 相似文献
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Single borehole heat exchanger (BHE) and arrays of BHE are modeled by using the finite element method. Applying BHE in regional discretizations optimal conditions of mesh spacing around singular BHE nodes are derived. Optimal meshes have shown superior to such discretizations which are either too fine or too coarse. The numerical methods are benchmarked against analytical and numerical reference solutions. Practical application to a borehole thermal energy store (BTES) consisting of 80 BHE is given for the real-site BTES Crailsheim, Germany. The simulations are controlled by the specifically developed FEFLOW-TRNSYS coupling module. Scenarios indicate the effect of the groundwater flow regime on efficiency and reliability of the subsurface heat storage system. 相似文献
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封闭式路堑U型槽结构作为纯地下建筑,抗浮问题非常突出。本文以北京某封闭式路堑U型槽结构工程为例,在对场区进行水文地质条件分析及远期最高水位预测的基础上,建立适用的水文地质概念模型及地下水流定解数学模型,使用FEFLOW软件建立了场区三维数值模拟模型,利用该模型进行抗浮设计水位预测。模型建立过程中考虑了场区各含水层的非均质性及场区潜水最高水位接近自然地面的工程特点。 相似文献
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A study of the feasibility of providing the heating and cooling needs of the new, large commercial building near Turin, Italy, by means of an open-loop indirect groundwater heat pump (GWHP) system is described. A finite element subsurface flow and transport simulator (FEFLOW) was used to investigate possible configurations of extraction and injection wells for five different scenarios. Modelling results confirmed the hydrogeological capacity of the site to provide the necessary amount of groundwater and associated energy with limited environmental impact. Injection of warmer (or cooler) water in the aquifer creates a thermal plume whose dimensions and geometry depend on the properties of the subsurface formations, particularly their thermal dispersivity values. The study suggests that there are several possible well configurations that could support the GWHP system without adversely affecting the aquifer. 相似文献
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将GIS与专业计算地下水运动的FEFLOW模型结合,建立地下水模型预测不同土地利用模式对干旱区绿洲地下水资源的时空分布产生的影响。研究区域选取三工河流域绿洲区,模型模拟显示绿洲上部主要城镇聚居区地下水位逐渐下降,下部地下水位呈现缓慢上升趋势。耕地作为显著变化的土地利用类型,成为影响区域地下水资源的决定性因素。 相似文献
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地下水环境影响评价中数值模拟的关键问题讨论 总被引:2,自引:0,他引:2
针对《环境影响评价技术导则地下水环境》(简称《导则》)中利用数值模拟技术进行地下水量和水质的影响预测评价工作在技术应用方法上存在的诸多问题,根据《导则》的具体要求,结合地下水环评项目的特点,提出了水文地质模型的概化、初始模型的建立和工况情景的设计与实现等三方面的关键问题,以多个项目实践经验为基础,基于FEFLOW平台,讨论了水文地质概念模型概化中的边界条件问题;对初始模型建立中的地表高程模型的生成、含水层结构的刻画、空间离散等三维地质建模问题给出了技术方案;并论述了边界条件及参数的输入、模型的校准和验证等初始流场建立工作中的基本工作方法和原则;同时探讨了弥散参数的确定、污染物总量的控制、连续源强和间断源强的设计实现、抽排水等工况设置方面的问题,以期为地下水环境影响评价中数值模拟工作的开展提供技术思路,同时为《导则》内容的实施提供一定的参考。 相似文献