EXPERIMENTAL STUDY ON UPGRADING WOOD RETENTION SYSTEM USING WAND CONNECTED TO MAIN CHANNEL AT TIME OF FLOOD

Abstract

 This paper proposed and tested a new large wood retention system in which embayment zone is connected to main channel and woody debris is removed when water level rises. The laboratory flume experiments were conducted by varying the elevation of the embayment zone, entrance shape of embayment zone, installation angle of groyne, groyne position, number of groynes and Froude number. The results showed that the trapping probability is highly influenced by the entrance shape of embayment zone. Then, we measured the flow velocity by PIV and examined the effect of the circulation flow. We also evaluated the followability of driftwood to the water flow varying the dowel model length.