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本研究では，福岡県朝倉市秋月地区に残る空石積み護岸で整備された河川水路網に着目し，数値シミュレーションと現地踏査によってその治水機能の評価を試みた．治水機能は最大時間雨量約100mm/hに達した2017年7月豪雨を再現した洪水氾濫シミュレーションとその1.4倍降雨量のシナリオの2つで評価した．その結果，空石積みで整備された河川・水路網は，コンクリート等の近代技術による整備と比べて流域下流端のピーク...流量を減少させる効果があることが明らかとなった．河川や水路内の最大流速についても，空石積み護岸の設計流速5m/s以下に抑え，河道内構造物の安全性を高めていることが示された．さらに，秋月の水路網は河川と並行することで雨水流出の河道への集中を抑え，町内から下流に至るまで河川のピーク流量を低減させる機能があることが明らかとなった．
The purpose of this study is to evaluate the function of the historical channels and rivers flood control system in Akizuki, which has been maintained by dry masonry technique and is based on Nature-based Solutions and Natural Flood Management. The flood control function will be evaluated in two scenarios: a simulation of the July 2017 heavy rainfall that reached a maximum hourly rainfall of approximately 100 mm/h, and a scenario with 1.4 times that amount of rainfall. As a result, it was found that the historical flood control system was effective in reducing the peak flow discharge at the downstream end of the basin. Furthermore, it was shown that the high roughness of rock-made rivers and channels ensured the safety of the in-channel structures by keeping the flow velocity below 5 m/s, which is the design flow of dry masonry revetment, even under the 1.4 times rainfall scenario. This study clarified not only the historical flood control characteristics of dry masonry but also the flood control function of the channel network. It was found that the channel network in Akizuki has the function of reducing the peak flow rate of the river from the town to downstream by detouring the rainwater by running parallel to the river.続きを見る
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