2020 Volume 26 Pages 271-276
Although a model for estimating exposure height of river-bed stones can reduce costs for evaluating riverbed environment in comprehensive sediment management, the accuracy of the estimation model should be verified. This study quantitatively examined the accuracy of the model by comparing between distribution shapes of measured and estimated exposure height using a statistical analysis method (Kolmogorov-Smirnov test). Significant difference was not detected in many cases (13 of 15 cases) where riverbed conditions were diverse, suggesting that the estimated model should have a certain accuracy. The accuracy was negatively correlated with ratio of coarser materials such as cobbles, indicating that the accuracy tends to be decreased when the model is applied to riverbed with high ratio of the coarser materials. In conclusion, the estimation model can be applicable to many locations in rivers although the accuracy of the model should be verified when applied to riverbed with much coarser materials.
