2023 Volume 79 Issue 18 Article ID: 23-18020
The blockage of the movement of a sand body occurrs on the Shimizu coast located northeast of the Shizuoka coast. On the other hand, sand back pass, by which sand is excavated at the north end of the Shimizu coast and is transported upcoast for the beach nourisment, has been carried out the Shimizu coast and the sandy beach of the Shimizu coast has been barely maintained by this activity. It is required to recover the condition, in which sand supplied from the Abe River is naturally supplied to the coast, for the shore protection to be sustainable. Therefore, beach changes associated with the movement of a sand body were investigated using satellite images and an UAV, togeter with field observation. It was found that sand movement was blocked by the installation of detached breakwaters of short offshore distance.
