Estimation of Erosion Resistance of the Levee Slopes Covered by Vegetation Which is Managed by Two Cuttings per Year.

Abstract

Levee slope protection by use of vegetation is more economical and suitable for river enviroment than ordinary protection constructed by concrete blocks. It is important for practical use of protection by use of vegetation to clarify the relation between erosion resistance and vegetation management. In this study, erosion resistance of the levee slopes covered by vegetation which is carried out most popular vegetation management, two cuttings per year, was estimated on the basis of results of levee survey which was conducted at six different rivers. Futhermore estimation method of frequency of cuttings per year was proposed to maintain higher resistance to erosion.