Numerical Modeling of Recovery of Moisture from the Unsaturated Zone: A Feasibility Study

IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Groundwater Pub Date : 2024-08-05 DOI:10.1111/gwat.13436
Amitabha Mukhopadhyay, Adnan Akber, Harish Bhandary
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Abstract

Numerical modeling of the recovery of moisture by injecting warm air in the unsaturated zone in a 100 m × 100 m plot of agricultural land in Kuwait, a country located in an arid environment, was conducted to provide “proof of concept” of the technique. If technically and economically feasible, it will be a potential additional source of water that could be exploited for farming activities and other uses. The COMSOL software was used to develop the model and, based on the results of the scenario runs, the effects of different hydraulic and operational parameters, including that of well spacing, on moisture recovery were assessed. In general, the results suggested that the recovery should increase with the increase in the hydraulic conductivity of the unsaturated zone, the amount of heat input, and the pressure differential between the unsaturated zone and the well head. Within the period examined (0 to 11 days), the recovery decreases with the increase in the soil moisture content, possibly due to the fall in relative permeability to moisture-rich air with the increased water contents in the pore spaces, although the effects may change over a longer period as water contents decrease with moisture recovery. The moisture recovery from the unsaturated zone through the injection of warm air appears to be a feasible proposition from this study that should be demonstrated through a pilot scale experiment in the field.

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从非饱和带回收水分的数值建模:可行性研究。
在科威特(一个位于干旱环境中的国家)的一块 100 米×100 米的农田中,通过在非饱和区注入暖空气进行水分回收的数值建模,为该技术提供了 "概念验证"。如果在技术和经济上可行,这将是一个潜在的额外水源,可用于农业活动和其他用途。利用 COMSOL 软件开发了模型,并根据情景运行的结果,评估了不同水力和操作参数(包括水井间距)对水分回收的影响。一般来说,结果表明,随着非饱和区水力传导性、输入热量以及非饱和区与井口之间压力差的增加,回采率也会增加。在研究期间(0 到 11 天),土壤水分含量增加,回采率下降,这可能是由于孔隙中含水量增加,富含水分的空气的相对渗透率下降,尽管随着水分回采,含水量下降,这种影响可能会在更长的时间内发生变化。从这项研究来看,通过注入暖空气从非饱和带回收水分似乎是一个可行的提议,应通过在实地进行小规模试验来加以证明。
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来源期刊
Groundwater
Groundwater 环境科学-地球科学综合
CiteScore
4.80
自引率
3.80%
发文量
0
审稿时长
12-24 weeks
期刊介绍: Ground Water is the leading international journal focused exclusively on ground water. Since 1963, Ground Water has published a dynamic mix of papers on topics related to ground water including ground water flow and well hydraulics, hydrogeochemistry and contaminant hydrogeology, application of geophysics, groundwater management and policy, and history of ground water hydrology. This is the journal you can count on to bring you the practical applications in ground water hydrology.
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