Laguna : 汽水域研究

Research Center for Coastal Lagoon Environments, Shimane University

ISSN:2185-2995(online)
ISSN:1340-3834(in print)

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Use this link to cite this item : https://ir.lib.shimane-u.ac.jp/3061

Laguna : 汽水域研究 6

1999-03 発行

本庄工区の干拓と淡水化について

The Land Reclamation of Honjo Area in Lake Nakanoumi and Freshening Project of the Remaining Water Basin

Date, Yoshio

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d0070006l022.pdf 11.9 MB

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中海干拓淡水化事業は干拓と淡水化がセットになって始められたものであり，その片方だけで事業の完成はありえない。その理由の一つは，干拓によって水面から5メートルも低い土地が現れると，大根島の地下水（淡水）は干拓地側へ流出してしまい，そのあとに中海の塩水が入り込んで大根島の農業が成り立たなくなることである。理由の二は，揖屋干拓地の農業用水は，広大な流域を擁する意宇川水系に頼っているが，揖屋地区の7倍の面積を持つ本庄工区で期待される島根半島側の小4河川の流域は意宇川の1／5にも達せず，淡水化を考えない限り，採算のとれる農業の展望はない。その「淡水化」については，大幅に水質がよくなると予測されていた1998年（平成10年）度になって，依然として，淡水化再開の条件である両湖の水質改善の見通しは立っていない。これらの問題を科学的なデータに基づいて論じてみたい。

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d0070006l022.pdf 11.9 MB

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