2024 Volume 80 Issue 18 Article ID: 24-18003
Long-term shoreline changes of Banzu tidal flat in Tokyo Bay were investigated using aerial photographs and satellite images. Longitudinal profiles across the foreshore and tidal flat along several transects were measured together with the sampling of seabed materials. On the basis of these data, recent topographic changes of the Banzu tidal flat were investigated. Then, regarding the tidal motion as a type of waves, the equilibrium slope concept under waves was applied to the formation of the tidal flat with a gentle slope as well as the foreshore of the marginal coast of the tidal flat. Due to the field observation and previous studies, topographic changes of tidal flat are caused by the suspension of the bottom sediment under tide, whereas that of the foreshore is caused by waves.Amodel for predicting the topographic changes was developed, taking both effects into account. In this model, the exchange of bed material between the tidal flat and the foreshore can take place.
