NUMERICAL STUDY ON DESIGNING RETENTION FACILITIES OF WOODY DEBRIS IN RIVER BENDS

Abstract

 Woody debris increases the destructive force during flood events, especially their accumulations at river bridges lead to the increase of flooding areas. Furthermore, recent serious flood events have highlighted the need to retain woody debris directly in larger rivers, and to construct the effective retention facilities which have enough capacity for accumulated woody debris. This study aims to evaluate the effect of retention facility of woody debris in river bends by using the simulation model composed of depthaveraged flow analysis and extended distinct element method for woody debris behavior. Results of calculations show the good performance of the retention facilities around river bends in the Seki River and we can recognize the proposed model is useful for the design of the retention facilities.