干拓による地下水位低下について-2-

概要

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When an inland lake is reclaimed, the phreatic water table in the unconfined aquifer above the semi-pervious layer is lowered over the area of the newly formed polder. The lowering has a large influence on the artesian water level. This water table will drop, with the result that outside the polder water from the unconfined aquifer percolates downward through the semi-previous layer, while inside the polder artesian water percolates upwards through this layer, appreciably increasing the amount of drainage water to be pumped out. This results in lowering of the phreatic water table outside the polder. After due consideration of the groundwater flow, the authors devise the artificial means to prevent the lowering of the phreatic water table outside the polder with a two-layered leaky artesian aquifer.
長崎大学工学部,Faculty of Engineering, Nagasaki Universityの論文