<Research Notes>Characteristics and Formation Factors of Water Environment in Islands of Nagasaki Prefecture : Focusing on Tsushima Islands, Iki Islands, Hirado Islands

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  • <研究ノート>長崎県島嶼における水環境の特性と形成要因 : 対馬・壱岐・平戸を中心に
  • ナガサキケントウショ ニ オケル ミズ カンキョウ ノ トクセイ ト ケイセイ ヨウイン : ツシマ ・ イキ ・ ヒラト オ チュウシン ニ

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Abstract

Based on comparison and consideration of water environment such as river water quality and precipitation, mainly on Tsushima, Iki and Hirado islands in Nagasaki prefecture, we clarified the difference in characteristics and their forming factors. Tsushima island is influenced by wind salt transfer in Shimojima, island but Kamijima island is relatively influenced by geology etc, and rivers with electric conductivity more than three times more than others are also seen. In Iki islands, the influence of geology, land use, agricultural water using groundwater was strong, and there were some areas where the contribution of deep groundwater was strong. On Hirado Islands there were many rivers with strong influence of geology, and in the surrounding Ikitsuki island and Azuchi Oshima island is affected by wind blowing salt. In Nagasaki prefecture islands, factors such as topographical and geological factors, the influence of wind salt transfer, and the use of agricultural water are considered to have an influence on the water quality of rivers and groundwater.

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  • 法政地理

    法政地理 51 45-56, 2019-03-20

    法政大学地理学会

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