FLOOD CONTROL FUNCTIONS OF THE HISTORICAL RIVER AND CHANNEL NETWORK IN THE CASTLE TOWN AKIZUKI

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  • 城下町秋月に残る歴史的河川・水路網の治水機能の評価

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<p> 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.</p>

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