2015 Volume 71 Issue 2 Pages I_455-I_460
Coral cays formation mechanism has various reports and research, but observation data is almost less. So, coral cays formation field of wave field and flow field is still unknown. In this study, we discuss about external force of coral cays formation. In field survey we focused the ballast island on northern reef of Iriomote Island which is formed by only coral gravels. And, we performed numerical calculation to complement the external force field to coral cays formation. As a result, we understand that external force of coral gravel transport is caused by the waves than the flow on the reef. And, there has high potential of coral gravel transport, from bi-directional (NE and NW) waves on the reef center caused by interaction of the refractive wave of behind Hatoma shielding and two depressions near north ballast island.
