2023 Volume 79 Issue 17 Article ID: 23-17072
On Ajigaura Beach, sand back pass has been carried out to recover a sandy beach for bathing during summer season. The beach changes after the nourishment were monitored by the survey using an UAV. The beach topography was measured immediately after the beach nourishment as well as the measurements after 3 and 6 months from the beginning. Because these surveys were carried out at long intervals, it was difficult to analyze the temporal changes of the beach. In this study, the measurement using an UAV was recurrently carried out at short time intervals together with the photographing from a fixed point. It was found that sand was transported even under the normal wave condition, although nourishment sand was in active during storm wave condition. Thus, beach produced by beach nourishment quickly disappeared, implying the ineffectiveness of sand back pass at Ajigaura Beach.
