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急流河川泉川の多自然川づくりの報告

机译:急流泉川的多自然河流开发报告

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摘要

泉川の多自然川づくりでは,先ずは,小さな落差が連続する河道の特性を捉え,そこに生息する生物や周辺の景観との関連性を把握するために基礎調査を実施し,関連性を特徴づけた. 次に改修の整備方針では,現存の物理的環境を極力保全し,また,復元することで生態系が回復していく手法を採用した.%The Izumi River is a rapid, narrow and meandering stream. It locates at the foot of the Yatsugatake Mountains at Hokuto City, in Yamanashi Prefecture. The river improvement is an urgent work to control the floods caused by the heavy rain. Considering of ecology and natural landscaping, introducing of nature friendly river works was also indispensable. The river improvement has to be maintained the existing alignment and slope to save vegetation, trees, benthos and fishes along the river. Installation of steps and pools along the river was one of key in the improvement work for the restoration of its own environmental properties. The location, size, interval and width of existing natural steps was surveyed and the data was utilized for the basic design, being focused on the restoration of existing drops. Conducting the additional fields survey after the completion of the improvement, we recognized that the new artificially installed drops created quite similar flow to the previous one. We also observed the restoration of vegetation, benthos.rnIt is expected that the restoration leads to prompt returning of original fishes lived there before the improvement.
机译:在Izumi River创建多自然河的过程中,首先进行了特征调查,以了解连续小头的河道的特征,并了解与生物和周围风景的关系。接下来,在恢复维护政策中,我们采用了一种方法,该方法尽可能保留现有的物理环境,并对其进行恢复以恢复生态系统。%泉河急速,狭窄而蜿蜒它位于山梨县北斗市八岳山脚下,河道整治是控制大雨造成的洪水的紧急工作。考虑到生态和自然美化,引入了自然友好的河道工程河流改良必须保持现有的路线和坡度,以保存沿河的植被,树木,底栖生物和鱼类。沿河安装台阶和水池是恢复其自身的改良工作的关键之一。对现有自然台阶的位置,大小,间隔和宽度进行了调查,并将数据用于基础设计,着重于对现有液滴的修复。改善工作完成后,我们认识到新的人工滴落产生的水流与上一滴非常相似,我们还观察到植被的恢复(底栖生物)。改善。

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