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An Innovative Method to Estimate Groundwater Level |
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PP: 155-163 |
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doi:10.18576/amis/110118
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Author(s) |
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Wang Iau-Teh,
Chung Weihao,
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Abstract |
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| Soil properties and the position of illegal pumping wells can all be determined through the use of the groundwater level
which, however, cannot be measured without the excavation of observation wells or the purchase of ground penetration radar. The
former destroys terrain features, and the latter is expensive, aside from its limitations. This paper attempts to solve these problems
by estimating groundwater levels economically via atmospheric conditions, and by collecting soil parameters near to the land’s
surface. Firstly, the Penman-Monteith evaporation formula is explored to deduce the value of the embedded resistance ratio, which
governs the involved water content, evaporation speed and, eventually, the groundwater level. Secondly, two theoretical models based
on Darcy’s law are developed for predicting groundwater levels, one depending on a steady-state assumption and the other being
identified as an analytical solution. To justify the first model, the time lapse required before achieving the steady state is estimated by
solving numerically the air-liquid two-phase flow equations involving soil temperature variations. For efficiency, a special coordinate
transformation is adopted to fix the spatial domains of all related numerical models between 0 and 1. The so-obtained numerical
solutions not only testify to the accuracy of the newly developed theoretical models, but they also detect the interactions among air,
water, evaporation, and temperature. |
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