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首页> 外文期刊>Environmental Monitoring and Assessment >Mine water supply assessment and evaluation of the system response to the designed demand in a desert region, central Saudi Arabia
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Mine water supply assessment and evaluation of the system response to the designed demand in a desert region, central Saudi Arabia

机译：在沙特阿拉伯中部沙漠地区的矿山供水评估和系统响应设计需求的评估

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The efficient use of water resources in arid region has become highly relevant in the evaluation and mining planning, since the exploration phase to closure. The objective of the numerical groundwater model was to assess the potential for groundwater extraction to meet mine water demand from one of the driest area in the world. Numerical groundwater models were used to assess groundwater resource. Modelling was undertaken using MODFLOW-SURFACT code, an advanced MODFLOW based code, within the framework of Visual MODFLOW version 4.6. A steady state model was developed to assess the regional groundwater flow pattern and to calibrate the recharge and hydraulic conductivity parameters in the model. The model was calibrated with a correlation of coefficient of 0.997, and root-mean-squared error is 0.3 m. A transient simulation model was used to predict the impact of 1.5 million cubic metre/year extraction for 10 years on the main aquifer hydrogeological regime, including after cession of pumping. Modelling simulated four hydrogeological scenarios. Model results for the 'worst case' scenario suggested that the Saq Sandstone aquifer should be capable of supplying the mine water demand (1.5 million cubic metre (MCM)/year) for 10 years. However, the long-term water-level drawdown shows a continuous decrease without achieving steady state conditions; thus, the majority of water is being taken from aquifer storage, and in the long term, there will be a mutual interference from a borefield located to the north of the model area. In this area, the hydraulic gradient is relatively steep and over-pumped for more than 28 years. Other scenario shows that there will be a recovery of around 8 m out of the 11.6-m drawdown, after 18 years of cession of pumping, implying that the aquifer will be stressed and a large percentage of water taken from aquifer storage. To minimise hydrogeological impacts, it is recommended to laterally spread out production bores, bores should be located where the Saq Sandstone is deepest, and operate the bores at low extraction rates. Overall, this study presents a useful numerical model output for mine water supply assessment and will contribute towards improving water resources management under different conditions in one of the world driest area.
机译：从勘探阶段到结束阶段，干旱地区水资源的有效利用已在评估和采矿计划中变得越来越重要。地下水数值模型的目的是评估从世界上最干旱的地区之一开采地下水以满足矿井水需求的潜力。数值地下水模型用于评估地下水资源。在Visual MODFLOW 4.6版的框架内，使用MODFLOW-SURFACT代码（一种基于MODFLOW的高级代码）进行了建模。建立了稳态模型，以评估区域地下水流动模式并校准模型中的补给和水力传导率参数。用系数0.997的相关性对模型进行校准，并且均方根误差为0.3 m。使用瞬态模拟模型来预测10年内150万立方米/年的抽水对主要含水层水文地质状况（包括抽水后）的影响。建模模拟了四个水文地质场景。 “最坏情况”情景的模型结果表明，Saq砂岩含水层应能够满足10年的矿井需水量（150万立方米/年）。然而，长期的水位下降显示出持续下降而没有达到稳态条件。因此，大部分水是从蓄水层中取水的，从长远来看，位于模型区域北部的钻孔场将产生相互干扰。在该地区，水力梯度相对陡峭，超过28年被过度抽水。其他情况表明，在停止抽水18年后，从11.6 m的水位下降中将可恢复约8 m，这意味着含水层将承受压力，并且从含水层存储中取水的比例很大。为了最大程度地减少水文地质影响，建议将生产钻孔横向展开，钻孔应位于Saq砂岩最深的地方，并以低抽采率操作钻孔。总体而言，这项研究为矿山供水评估提供了有用的数值模型输出，并将有助于改善世界上最干旱地区之一在不同条件下的水资源管理。

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