3 DIMENSIONAL FLOW ANALYSES AROUND RIVER STRUCTURES BASED ON FLOOD-FLOW MEASUREMENT BY MEANS OF ADCP

Abstract

In the present study, an ADCP flood measurement and 3D flow analyses were conducted around the Gudo point near the Shimanto-river bridge which is located at 9.5km upstream from the mouth of Shimanto River in Shikoku-island Japan, to reveal the details of flow structure around the bridge. There are some river structures such as bridge piers and bed protections around the bridge. There is also a large local scouring in the right bank side of the bridge. The scouring has progressed for a long period to 10m depth below water surface. In order to estimate the accurate discharge, detail flow structures considering with the complicated surroundings are needed for river management such as flood control. As a result, flood-flow velocity and bed profile were successfully measured by the ADCP and 3D flow was analyzed far downstream area from the bridge.