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According to the pieces of literature, types of coastal erosion can be classified into two groups. One is deforestations of mangrove forests. Although many coasts in Thailand had been covered by mangroves, a number of mangroves have been rapidly deforested for dozens of years. Consequently, several coasts have been not able to trap sediment supplies resulted in heavy erosion. The other is stoppages of sediment supplies due to huge facilities—such as dams, breakwaters, groins, and jetties—and sand dredges, such as aggregate extractions, and channel maintenance dredges.