Abstract
People's interest in rivers seems to concentrate on the close-to nature work. However, it has not yet attained the stage estimating the erosive resistance of grass-covered levee which is one of the most important close-to nature work of rivers. In order to estimate the erosion threshold of grass-covered levees and to use as basic reference data in levee design, we performed erosion experiments on the grass-covered flood channels under certain hydrauric conditions, grass and soil properties. Erosion resistance of grass-covered surface and erosion limit are shown to be expressed in terms of bed-shear stress, erosion time, soil and grass properties. The applicability of this predicting method is confirmed by flood data and levee overflow experiment in situ.
