EFFECTS VERIFICATION AND ISSUESOF VANE WORKS 25YEARS AFTER INSTALLATION IN ONO RIVER

Abstract

Otsuru district of Ono River has meandering at right angle, and local scouring has occurred at the water colliding part. As a countermeasure, a vane works was installed in 1993 and 1994, and 25 years have passed since then. The effect of vane works construction due to changes in discharge scale and river channel conditions was analyzed using quasi-three-dimensional bed deformation numerical model. Scouring and erosion of the main channel reduced the effectiveness of the vane works and reduced the safety of the levee.