Elongation of Sand Spit and Profile Changes on Sloping Shallow Seabed

Topographic changes around the tip of the Mihono-matsubara sand spit with successive sand deposition into a deep sea were investigated using bathymetric survey data. Then, numerical simulation of the elongation of the sand spit on a sloping seabed with different water depths and slopes was carried out using the BG model (a three-dimensional model for predicting beach changes based on Bagnold's concept), and the relationships among the sand volume comprising the sand spit, the planar area of the sand spit, and the length were shown.