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首页> 外文期刊>Environmental Monitoring and Assessment >Modeling interactions between saturated and un-saturated zones by Hydrus-1D in semi-arid regions (plain of Kairouan, Central Tunisia)
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Modeling interactions between saturated and un-saturated zones by Hydrus-1D in semi-arid regions (plain of Kairouan, Central Tunisia)

机译：通过Hydrus-1D在半干旱地区（突尼斯中部凯鲁万平原）模拟饱和区和非饱和区之间的相互作用

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摘要

In semi-arid areas like the Kairouan region, salinization has become an increasing concern because of the constant irrigation with saline water and over use of groundwater resources, soils, and aquifers. In this study, a methodology has been developed to evaluate groundwater contamination risk based on the unsaturated zone hydraulic properties. Two soil profiles with different ranges of salinity, one located in the north of the plain and another one in the south of plain (each 30 m deep) and both characterized by direct recharge of the aquifer, were chosen. Simulations were conducted with Hydrus-1D code using measured precipitation data for the period 1998-2003 and calculated evapotranspiration for both chosen profiles. Four combinations of initial conditions of water content and salt concentration were used for the simulation process in order to find the best match between simulated and measured values. The success of the calibration of Hydrus-1D allowed the investigation of some scenarios in order to assess the contamination risk under different natural conditions. The aquifer risk contamination is related to the natural conditions where it increased while facing climate change and temperature increase and decreased in the presence of a clay layer. Hydrus-1D was a useful tool to predict the groundwater level and quality in the case of a direct recharge and in the absence of any information related to the soil layers except for the texture.
机译：在半干旱地区，例如凯鲁万地区，由于持续不断地用盐水灌溉以及过度使用地下水资源，土壤和含水层，盐碱化问题日益引起人们的关注。在这项研究中，已经开发了一种基于非饱和带水力特性来评估地下水污染风险的方法。选择了两种具有不同盐度范围的土壤剖面，一个剖面位于平原的北部，另一个剖面位于平原的南部（每个深度30 m），并且都具有直接补给含水层的特征。使用Hydrus-1D代码使用1998-2003年期间测得的降水数据进行了模拟，并计算了两个选定剖面的蒸散量。为了在模拟值和测量值之间找到最佳匹配，在模拟过程中使用了水含量和盐浓度的初始条件的四种组合。 Hydrus-1D的校准成功完成，可以对某些情况进行调查，以评估不同自然条件下的污染风险。含水层风险污染与自然条件有关，在自然条件下，它面临气候变化而增加，而在粘土层存在下温度升高和降低。 Hydrus-1D是一种有用的工具，可以在直接补给的情况下并且在没有任何与土壤层有关的信息（纹理除外）的情况下，预测地下水位和水质。

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