日本地下水学会会誌
Online ISSN : 2186-5515
Print ISSN : 0029-0602
ISSN-L : 0029-0602
海岸地下水中への揚水による塩水侵入に関する模型実験(続)
川端 博
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ジャーナル フリー

1974 年 16 巻 1 号 p. 19-25

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Substantial quantities of ground water have been and are being withdrawn from the ground-water reservoir of the areas at near the sea in Japan. The total amount of water withdrawn from wells is termed the gross pumpage. Before the gross pumpage begins, the chloride content of the water is normally about 10-20 ppm. As the pumping up of large quantities of ground water progresses, the interface between fresh and salt water and the zone of diffusion move father and father inland in response to the withdrawal of fresh ground water.
Effects of pumping ground water caused considerable concen locally: (1) Declining ground water levels in the vicinity of pumping wells, and (2) increasing chiorid content of the water pumped from some well near the sea.
Model experiments can play an important role in the forecast of the consequences and the recognition of the states of salt water intrusion of developing agifers having complicate stracture.
Photographs 1-16 show the states of coning up and down of the interface between fresh and salt water according to the positions of point sink (strainer), the quantities of pumpage and the flowing volumes of ground water through the media.
(1) When the point sink is situated in the salt water before pomping up, the edge of salt water retreats to the sea.
(2) In the case of poor supply of frerh water, a pumpage on the interface introduces the salt water intrusion to inland, but good supply of fresh water, same pumping up makes the edge retreat to the sea.
(3) By pumping up of large quantities of the ground water the edge goes to inland or back to the sea in accordance with the position of point sink, and the interface reaches to the point sink. And the curve of interface under the point sink is convex toward the sea.

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