The Study On Movement Characteristics Of Coral Sand And The Protection Of The Loss Of Sediment On Coral Island

Coral island is a special kind of bio-geomorphologic patterns. Existing in the low-latitude tropical ocean, it's very important for the development and utilization of the fishery and mineral resources, even has the significance for the protection of the national territory. At present, as the rising sea-level and the increasing development, protections for coral island to against the destruction are needed immediately. The corrosion mainly manifests in the loss of coral sand, so according to the research of movement theory, to control the loss is aimed to protect island. However, a comprehensive discussion on movement characteristics of coral sand is almost absent previously. And little research had been taken on the effect of protection for coral island. The main works of this paper are as follows:(1) Analyzing the product process, the physical properties of coral sand were comprehended. Compared the results which were given by empirical formula and flume experiment, considered the influencing factors, movement characteristics and suitable empirical formula of coral sand were summarized.(2) Based on the growth conditions, the topographical features of coral island and the dynamic environment around island were studied. The movement forms of coral sand caused by hydrodynamic condition at different part of island were discussed. And the possible ways for the loss of sand was pointed out.(3) According to the summary about several types of protection which were widely used, the suitable protections for each shoreline types were expounded. Based on the study of the loss of coral sand, the probability ideas of protection for coral island were given. Through the physical model experiment, the effects of different protections confirmed the ideas. In order to achieve better effects, more optimizations should be taken in the program.