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

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  • セットバック型に改良された沼川第二放水路の現地放水実験

Abstract

<p> Field experiment of flooding through an opening of No. 1 floodway that filled with sand was carried out at Numakawa-daini Floodway, while maintaining the highest water level of the tank to be +4.6 m above MSL. Beach topography was measured using a GPS-RTK and UAV before and after the flushing. The change in water level inside the water tank and at the opening of the floodway was also measured. As a result, the water discharge from the opening of approximately 1 m height was capable, when the water level of the water tank is set to be +4.6 m above MSL and 21 m3 of sand was discharged from inside the conduit by the current through the floodway. Furthermore, a v-shape channel excavated next to the floodway was effective in forming discharge channel.</p>

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