This study aims to evaluate the effects of different cover ratios of erosion control geosynthetic mesh on the erosion potential along hillslopes. Simulated erosion tests were carried out under three slope gradients (36°, 46°and 61°) and two rainfall intensities (100 mm hr-1 and 150 mm hr-1). The C factors were also estimated for each mesh after determination of actual soil losses. The results indicated that the mesh with 99% cover ratio had very low soil loss ratios (0.01-0.08%) and low C values (0.007±0.008). The meshes with cover ratios of 83% and 77% had higher soil loss ratios ranging from 0.04% to 100% than the one with higher cover, and the estimated C values for these two meshes were 0.219±0.381 and 0.288±0.177, respectively. A significantly negative linear relation (C value = -0.0098 Vegetation Cover (%) + 1.0084) was found between vegetation cover ratio and soil loss in this study, which further indicates that vegetation cover ratio is a critical factor determining
soil loss along hillslopes.
Key Words : Cover ratio, erosion control geosynthetic mesh, hillslope, soil erosion.