FIELD EXPERIMENT ON FLOOD DISCHARGE THROUGH AN OPENING OF NUMAKAWA-DAINI FLOODWAY OF SET-BACK TYPE

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  • セットバック式に改良された沼川第二放水路1号水路での放水実験

Abstract

<p> An opening was built in channel No. 1 out of three channels of Numakawa-daini floodway to transform the shape of the channel into a set-back type and the capability of flood discharge through the opening was investigated by a field test. Field investigation was carried out on December 8, 2020 and imageries were taken using a UAV before and after the flooding. Three-dimensional topography was measured using the UAV imageries as well as the measurement of water levels in the water tank, from which flood water is discharged, and the opening using a pressure-type water level gages. A flood water with a maximum discharge of 5.5 m3 /s flowed down over the berm, when the water level inside the water tank was +2.74 m above MSL and the water head between the opening and surface of water tank was 2.1 m.</p>

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