UAV空中写真の河床材料調査への適用性に関する検討

抄録

Recently UAV has been expanding its application to river surveys. In this report, we examined the applicability of UAV to riverbed material survey, which is important as channel characteristics. As a result, with regard to riverbed materials with a particle size of 4 mm - 8 mm or more, it is possible to grasp the particle size distribution with the same degree of accuracy as the field survey by reading the gravel diameter using an aerial photograph taken from an altitude of about 5 m. For riverbed materials with particle sizes of 4 mm to 8 mm or less, we could predict the average particle diameter with double half precision by using the correlation formula between standard deviation of luminance of image and average particle size. By combining the two, it was possible to create a particle diameter curve with image accuracy equal to that of field survey from image analysis.