利用地理信息系统MODFLOW-2005和FREEWAT建模工具对布特尔贾沿海含水层(阿尔及利亚东北部)地下水流量和预算进行初步评估

IF 0.8 Q4 WATER RESOURCES
Khaled Harizi, Mohamed Reda Menani, Nabil Chabour, Sofiane Labar
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引用次数: 1

摘要

布特尔贾沿海含水层是阿尔及利亚东北部最重要的地下水资源之一。该地区属于半湿润气候,年平均降雨量为600-880毫米。无承压含水层由第四纪砂层组成。水文地质特征是在前人报道的基础上确定的。一个非常重要的流入补给了东南边界的砂质含水层,这与连接含水层和Obeira湖区的断层网络系统有关。在南部边界与布特尔贾的冲积含水层交换处观察到另一个流入。本研究的目的是对该含水层的地下水流量和水收支提供初步评估。为了实现这一目标,利用MODFLOW-2005代码和FREEWAT软件,利用现有数据,建立了一个单层地下水流数值模型。该模型在稳态条件下运行。校准使用2018年5月的压力测量作为校准目标。经过多次人工标定试验,该模型成功地模拟了地下水的流向和水头。校准工作导致估算和计算的水力电导率与压力计水头之间的一致性可接受(为了本研究的目的),东部边界除外。模拟入流收支分析表明,除了降雨入渗外,与地表水体的交换、相邻的冲积含水层和断层系统提供了相应的水量。这种重要的补充需要进一步的调查。利用MODFLOW、FREEWAT软件和GIS进行的数值模拟工作达到了对地下水流动进行初步描述的目标,它代表了对boueldja沿海含水层进行更彻底的水动力表征的一个可接受的起点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Initial assessment of the groundwater flow and budget using Geographic Information System, MODFLOW-2005 and the FREEWAT modeling tool in Bouteldja coastal aquifer (Northern East of Algeria)
The Bouteldja coastal aquifer is one of the most important groundwater resources in North eastern of Algeria. The region is under a sub-humid climate with an average rainfall of 600-880 mm/y. The unconfined aquifer is constituted of Quaternary sands formations. The hydrogeological characteristics were determined based on previous reports. A very important inflow recharges the sandy aquifer in the Southeastern boundary, in relation to a fault network system linking the aquifer and the Obeira Lake area. Another inflow is observed at the Southern boundary in relation to the exchanges with the alluvial aquifer of Bouteldja. The purpose of the present study is to provide an initial assessment of the groundwater flow and water budget of this aquifer. To achieve this goal, a one-layer groundwater flow numerical model was developed using the MODFLOW-2005 code and the FREEWAT software, using the available data. The model was run in steady state conditions. Calibration was achieved using the piezometric measurements of May 2018 as calibration target. After several trials of manual calibrations, the model successfully simulated the groundwater flows directions and heads. Calibration efforts lead to an acceptable concordance (for the purpose of this study) between the estimated and calculated hydraulic conductivity and piezometric heads, except at the Eastern border. The analyses of the simulated inflow budget shows that aside the rainfall infiltration, exchanges with surface water bodies, the adjoining alluvial aquifer and the fault system provide a relevant amount of water. This significant recharge needs additional investigations. This numerical modeling exercise using MODFLOW, the FREEWAT software and GIS reached the objective of a preliminary description of the groundwater flow and it represents an acceptable starting point for more thorough hydrodynamic characterization of the Bouteldja coastal aquifer.
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来源期刊
CiteScore
1.80
自引率
50.00%
发文量
36
审稿时长
8 weeks
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