PREDICTING CHANGE IN SAND MOVEMENT ON CORAL REEF DUE TO SEA LEVEL RISE ASSOCIATED GREENHOUSE EFFECT

Abstract

 The movement of sand supplied from the vicinity of the reef edge was predicted using the BG model considering the change in grain size, taking Point Zampa located on the west coast of Okinawa as an example. Given sand with different single grain size and composed of mixed grain sizes, sand movement was predicted. Regarding the effect of the sea level rise associated with the greenhouse effect, the scenario RCP8.5 in the Fifth Evaluation Report of IPCC was referred. Assuming that the wave condition and sand supply from the reef edge were constant, the calculation of sand movement was carried out when the sea level increases by 0.5 and 1.0 m relative to the present level. It was found that the sea level rise causes the decrease in sand supply from the reef edge.