2023 Volume 79 Issue 18 Article ID: 23-18134
Data on sediment grain size and foreshore slope were obtained from 297 sandy beaches in Japan. The former was calculated from images, the latter was measured from the shoreline to the runup point using an inclinometer. The beaches could be classified into four area: Pacific Ocean side, Japan Sea side, inner bay and Okinawa. The frequency of grain size had two peaks at 0.3mm and 1.5mm, and the foreshore slope between 0.08 and 0.16. The dynamic relationships between sediment grain size and foreshore slope was calculated based on the constructal law with the modified coefficient from laboratory experiments. The amount of shoreline retreat in each area was estimated based on Bruun law and the obtained results were comparable to previously reported values.
