Numerical Modeling of Seawater Intrusion Management Measures
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概要
- 論文の詳細を見る
Overexploitation of coastal aquifers has become a common issue with many coastal regions experiencing extensive seawater intrusion, resulting in severe deterioration of groundwater quality. When analyzing the freshwater quality extracted from the pumping wells in coastal aquifers, the movement of very low concentrations of the solute is critical in analyzing the level of contamination in pumping wells. This research analyzes the effectiveness of four seawater control measures using a hypothetical steady-state salt distribution model in a representative cross-section perpendicular to the coastline using a two-dimensional density-dependent solute transport model through homogeneous media. It is established that the shallow pumping wells are more preferable than the deep pumping wells as they have relatively lower concentration value in the pumping well. Low permeable aquifers give high concentration values in the pumping well and the extent of seawater intrusion is large than the high permeable ones. The level of contamination in the pumping well is proportional to the extent of seawater intrusion wedge. Pumping wells located further away from the seashore are not affected by the presence of the seawater intrusion wedge; however, this may not be an effective method of controlling seawater intrusion. Deep recharge wells closer to the pumping well seem to be the most effective method of controlling the extent of seawater intrusion and the concentration value in the pumping well. Deep seawater pumping wells located relatively away from the pumping well could be used to control seawater intrusion if proper disposal methods for the extracted saltwater are implemented. Low permeable barrier walls located closer to the pumping well could be used, although the initial cost of construction may be high.
- 日本雨水資源化システム学会の論文
著者
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Makokha Mary
Graduate School Of Agriculture Kyoto University
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Aoyama Shigeyasu
Environmental Science Division Ishikawa Prefectural University
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Kobayashi Akira
Graduate School Of Agricultural Science Kyoto University
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