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最上小国川 赤倉温泉のダムなし治水プラン
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Shinichi Kusajima
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山形県でダム問題に揺れている、最上小国川 赤倉温泉のダムなし治水プラン。昭和初期と現在の状態を比較し、歴史的な背景から治水プランを提示する。
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最上小国川 赤倉温泉のダムなし治水プラン
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昭和初期の赤倉温泉流域。 温泉確保のための堰あげ。 堰は木で住民の手作り
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近年の赤倉温泉 温泉確保のための堰あげ 県がつくった堰によって、河床全体が上昇 コンクリート 堰
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近年の赤倉温泉 温泉確保のための堰あげ 県がつくった堰によって、河床全体が上昇
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Notas del editor
これは、昭和8年の赤倉温泉流域です。正面右が三ノ条旅館、左側が阿部旅館です。右下の端のところにご注目ください。木製の堰が見られます。これは当時赤倉温泉の住民がみんなでつくったものと温泉街の方々から伺っています。この堰により水位をあげ、両旅館の温泉の風呂の水を安定させていました。 「堰あげ」というのは、川からの農業用水の取水などで河川をせき止め、水位を上昇させるやり方です。当時、この流域の数カ所でおこなわれていたと伺っています。 この「堰」は、木製で手作りなので、大水が発生した場合は壊れ、流されます。
現在の赤倉温泉の写真です。堰がコンクリートになっています。以前木製でつくっていた頃と機能は同様です。水位を上げ、温泉水位を保つためのものです。 コンクリートにしたため、破壊されることはなくなりましたが、大水時、この堰が水位の上昇の原因をつくることになっています。
堰を取り払い、温泉水位のために周辺部に水路をつくるなどしてケアをおこないます。橋の橋脚はいりません。これで水量を確保できます。水量が足りなければ 歴史的に川に迫り出してしまっている温泉旅館をある程度川から離してダウンサイジングして再生すればいいのです。これは老朽化して再生を願う温泉街にとってもメリットとなります。
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