Special Issue (Coastal Engineering)Paper
OBSERVATION METHOD OF WAVE RUN-UP HEIGHT BY IMAGE ANALYSIS AND APPLICATION TO CHIGASAKI COAST
2023 Volume 79 Issue 17 Article ID: 23-17188
Details
2023 Volume 79 Issue 17 Article ID: 23-17188
The study of wave run-up on sandy beaches is important not only for beach preservation but also for the functional evaluation of coastal protection facilities such as seawalls and for disaster prevention in the backshore areas. The authors proposed a new method to quantify the temporal changes in wave run-up based on image data taken at the beach, but there are still issues to be resolved in long-term observations. In this study, wave runup height during the period from 2020 to 2022 was analyzed using image data taken at the Chigasaki Coast in Kanagawa Prefecture, and the relationship between wave runup height, waves, and tides at the target coast was investigated. The wave run-up height obtained by the image analysis and the existing wave runup formula have a correlation with a coefficient of determination of about 0.63, and the run-up height obtained by the image analysis was about 1.7 times larger. The higher the value of wave height, the higher the run-up tended to be, and this tendency was confirmed to be stronger when the tide level was higher than the average during the period.
