| 講演要旨(和文) | | 仙台平野南部の亘理町、山元町では浜堤部の浅層地下水を利用したイチゴのハウス栽培が盛んであった。この地域のハウス農業は、東北太平洋沖地震に伴う津波により壊滅状態となったが、一部の地域では農業が再開されはじめた。しかし、既設の浅井戸は塩水化が生じており、新規水源が必要となった。沿岸地域の堆積物中には塩水くさびや化石塩水が伏在するため、これらを避ける必要がある。このため、水源開発候補地において電気探査を実施し、地下の塩水の影響を評価した。その結果、浜堤部では浅層地下水利用が期待できることと、沖積層下部〜基盤中の帯水層には化石塩水が存在し、利用が困難であることが判明した。 |
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| | 講演要旨(英文) | | The greenhouse horticulture of strawberry using shallow ground water in the beach ridge part was active in Watari Town and Yamamoto Town in the southern part of Sendai Plain. Agriculture began to be restarted in a part of region though the greenhouses in this region received catastrophic damage by the tsunami due to the 2011 off the Pacific coast of Tohoku Earthquake . However, the salinization was caused in existing shallow wells, and new water resources were required. Because the salt water wedge and fossil water lie behind the deposit in the coast region, it is necessary to avoid these. Therefore, the electrical prospecting was executed in the water resource development candidate sites, and the influence of salt water in the subsurface was appreciable. As a result, it turned out to be able to expect the shallow ground water use in the beach ridge. On the other hand, because fossil water exists in the lower alluvium and basement rocks, it has been understood that the deep groundwater use is difficult at the target point of deep well. |
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