Abstract
Artificial gravel can be produced from the mixture of coal ash, a small amount of cement, and water. Shell debris produced by smashing of the shell could be used as the beach nourishment material, similarly to natural gravel. However, there is no study on the movement of shell debris under waves. In this study, the difference in movement under waves of natural gravel, artificial gravel produced from coal ash, and shell debris with the same grain size were studied using two-dimensional wave channel. As a result, the location of the berm shifted landward in response to the wave height in the cases of natural gravel and artificial gravel, whereas the location of the berm remained constant with increasing berm height in case of shell debris. Regarding the prediction of the change in longitudinal profile, the BG model was improved so as for the formation of the reversed slope behind the berm top to be possible.
