Abstract
When waves are incident to a sandy beach from two opposite directions, a cuspate foreland or a land-tied island may develop. A typical land-tied island can be seen offshore of Shodoshima Island in the Seto Inland Sea. Another example is Chiringashima Island located in the south part of Satsuma Peninsula, Kyushu. In both cases, the island and land are connected by an extremely slender sand bar that has been stably maintained for a long time, suggesting that it is stable against wave action from both sides of the sand bar. We developed a numerical model for predicting the elongation of a sand bar of a land-tied island using the BG model (a three-dimensional model for predicting beach changes based on Bagnold’s concept).
Highlights
When waves are incident to a sandy beach from two opposite directions, a cuspate foreland or a land-tied island may develop
It was found that when the probability of occurrence of waves was different, the effect of the asymmetric wave incidence was left in the asymmetric form of a cuspate foreland and a land-tied island
These results are in good agreement with the measured results, as shown in Fig. 5, where the sand bar connecting Bentenjima and Oyoshima Islands had a concave shape on the east side, implying that the wave intensity from the east is greater than that from the west
Summary
When waves are incident to a sandy beach from two opposite directions, a cuspate foreland or a land-tied island may develop. A typical land-tied island can be seen offshore of Shodoshima Island in the Seto Inland Sea, Japan In both cases, the island and land are connected by an extremely slender sand bar that has been stably maintained for a long time, suggesting that it is stable against wave action from both sides of the sand bar. Field observations were carried out at the sand bars formed in the vicinity of Oyoshima and Chiringashima Islands, and we developed a numerical model for predicting the elongation of a sand bar of a land-tied island using the BG model, which was originally proposed by Serizawa et al (2006), and was applied to the prediction of the deformation of a coral cay when detached breakwaters were constructed around a circular island (Sannami et al, 2013)
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