REINFORCEMENT OF RIVER LEVEE IN STEEP RIVER ─ EFFECT OF FRONT LEVEE WIDENING

Abstract

Front levees widening are useful measures to strengthen river levee in a steep river. Two river model experiments of the Jouganji and Tedori Rivers in Hokuriku region are carried out and effect of a front levee widening was investigated. In the experiment,a two-dimensional, straight channel with a movable bed was used and the scale of the model is 1/100. Erosion width of a levee widening was investigated using the same hydrograph as the design discharge. As a result of experiment, we understood a region with a limit in the additional front levees widening. The experimental result is useful for the river channel design.