Phân tích diễn biến theo mùa của cửa sông Cửa Cạn, thành phố Phú Quốc, tỉnh Kiên Giang

Abstract

Sentinel-2 images with a resolution of 10 meters were used to survey the morphological changes of the sand-spits on both sides of the Cua Can River mouth in Phu Quoc City, Kien Giang Province, in combination with actual wave data from 2021 at the Phu Quoc hydro-meteorological station. The analysis results show that the sand-spits at the Cua Can River mouth change seasonally with alternating breaking and elongation. The breaking in the sand-spits are mainly due to the flow during the flood season from the Cua Can River from December to April, creating a sand barrier in the river mouth. During the Southwest monsoon season from May to November, southwest-directed waves generate littoral sediment transport, bringing sediment to the Cua Can River mouth and filling in the river mouth, connecting the sand barrier to the southern shore to form a new sand-spit. Based on the changes in the area of the sand-spit on the southern shore, the longshore sediment transport rate along the southern coast of Cua Can beach is estimated to be nearly 5,000 m³/year. This value is consistent with previous studies on sediment transport rates at Cua Can beach.