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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Modelling vadose zone processes for assessing groundwater recharge in semi-arid region
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Modelling vadose zone processes for assessing groundwater recharge in semi-arid region

机译：半干旱区地下水补给的模型型助产区工艺

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摘要

Normally groundwater recharge is estimated using methods based on water balance, water table fluctuations, fixed factor of annual rainfall and tracer movement. In many of these methods water stored in the vadose zone and evapotranspiration are not accounted properly. These factors control groundwater recharge to a large extent, particularly in arid and semi-arid regions which are normally characterized by a deep water table, thick vadose zone and high evapotranspiration. In this study, HYDRUS-1D and MODFLOW models were used to assess the recharge flux and groundwater recharge in an area under a semi-arid region giving due consideration to important vadose zone processes. Cumulative recharge flux at water table in various sub-areas varied from 20.01 cm to 23.43 cm (29.26% to 34.26% of the monsoon rainfall). The average groundwater recharge was 22.2%. Total surface runoff in various sub-areas varied from 3.39 cm to 14.36 cm (5% to 21% of the monsoon rainfall). Evapotranspiration was found to be a major recharge controlling factor. Reference evapotranspiration varied from 37.19 cm to 45 cm (54% to 66% of the monsoon rainfall). Natural recharge under the prevailing pumping rate and pumping schedule was 23.3% of the monsoon rainfall. Simulation results revealed that if all the surface runoff is retained in the area, water table will rise by 1.46 m.
机译：通常使用基于水平衡，水表波动，年降雨量和示踪运动的方法的方法估算地下水补给。在许多这些方法中，储存在散囊区和蒸散物中的水不会妥善核对。这些因素在很大程度上控制地下水充电，特别是在干旱和半干旱区域中，该区域通常以深水位，厚的散囊区和高蒸散蒸腾为特征。在本研究中，使用Hydrus-1d和Modflow模型来评估在半干旱区域下的区域中的充电助焊剂和地下水补给，其适当考虑重要的Vadose区过程。各个子区域的水桌子上的累积补给助焊剂从20.01厘米到23.43厘米（29.26％至34.26％的季风降雨）不同。平均地下水补给量为22.2％。各个子区域的总表面径流从3.39厘米到14.36厘米（5％至21％的季风降雨）不同。发现蒸散是一个主要的充电控制因子。参考蒸散蒸腾从37.19厘米到45厘米（季风降雨量的54％至66％）。在普遍的泵浦速率和泵送时间表下的自然充电是23.3％的季风降雨。仿真结果表明，如果所有表面径流保留在该区域中，水表将增加1.46米。

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