2021 Volume 26 Issue 2 Pages 13-23
This study aiming to perform a discussion about the transformation a secular variations, and the shore erosion before and after the typhoon passage at the Shimizu Coastal Area by using UAV (drone) photographs acquired the period from 2017 through 2019. We performed the interpretation using orthogonal images during the distance of 1,015 m between the reference points of No. 43 through No. 52 determined by Shizuoka Prefecture Civil Engineering Office. As the results, as for the state of the shore erosion, it was revealed that any secular variation of beach line was not found. It is thought that this status are given by the effects of every year maintain to put the sand bypass and set the headlands by the government of Shizuoka. As for the shore erosion was found before and after the passage of the typhoon. However, there were cases where coastal erosion was not occurred depending on the typhoon.
We intend to continue this investigation to the future to estimate the sediment and erosion sand capacities to evaluate and consider the current artificial measure.
