Abstract
Natural riverbanks are now disappearing rapidly because of river improvement and urbanization. In this study, we invetigated the features of natural riverbanks through field surveys and examined a method to measure the strength, for conservation and restoration of natural riverbanks. As a result that we surveyed the distribution of natural riverbanks using aerial photos, natural riverbanks has decreased remarkably in Kanagawa prefecture. And through field surveys, we understood the features of natural riverbanks, such as shapes, materials, vegetations and so on. Furthermore we estimated the riverbank erosion rate in Sakaigawa river and found that the riverbank erosion rate is slow and the channel has almost not changed since the Meiji period.
