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首页> 外文期刊>Modeling Earth Systems and Environment >Groundwater recharge estimation and its spatial distribution in arid regions using GIS: a case study from Qatar karst aquifer
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Groundwater recharge estimation and its spatial distribution in arid regions using GIS: a case study from Qatar karst aquifer

机译:利用地下水地下水补给估计及其在干旱地区的空间分布 - 以卡塔尔喀斯特含水层为例

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Groundwater recharge from rainfall is a major input into aquifers, especially in arid and semi-arid areas, where little or no surface water exist. However, estimation of rainfall recharge is not an easy task as it is highly variable spatially and temporally. In arid areas, recharge occurs indirectly after rainfall-runoff accumulates in low lands such as Wadis and percolates the aquifer. The method proposed in this study to estimate rainfall recharge is based on soil–water budget model and utilizing geoprocessing tools in GIS. It uses digital elevation model (DEM), land-cover and rainfall distribution to estimate runoff accumulation in low lands. The soil–water budget model is then applied to estimate the groundwater recharge in areas of runoff accumulation. The proposed methodology was applied on Qatar karst aquifer as a case study. The spatial resolution of raster maps was 350 by 350?m and the temporal resolution is one day. Results obtained in this study for the hydrological year 2013/2014 show the total groundwater recharge is approximately 14?million m_(3), and concentrated more in the northern part of Qatar. The method can be applied on any arid region.
机译:地下水从降雨中充电是含水层的主要投入,特别是在干旱和半干旱地区,那里存在很少或没有地表水。然而,降雨充值的估计不是一件容易的任务,因为它在空间和时间上的变化很大。在干旱地区,在降雨 - 径流累积在低地面之后的降雨和含水层的含水层的降雨后,充电会发生充电。本研究提出的方法来估算降雨充值是基于土壤 - 水预算模型,利用GIS中的地理处理工具。它采用数字海拔模型(DEM),陆地覆盖和降雨分布,以估计低陆径流累积。然后应用土壤 - 水预算模型来估算径流累积区域的地下水补给。拟议的方法应用于卡塔尔喀斯特含水层作为案例研究。光栅地图的空间分辨率为350〜350?M,时间分辨率是一天。本研究在本研究中获得的水文2013/2014年的研究表明,地下水的全部充电总量约为14?百万M_(3),并在卡塔尔的北部集中。该方法可以应用于任何干旱区域。

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