Hainan Mannings Riyuewan Island Sediment Characteristics Research

Hainan riyuewan bay for a typical segmentation, from northeast to southwest can be subdivided into bedrock coast, sandy coast arc, coral reefs (rock) coast, sandy coast, coastal erosion residue type, the surf zone in its northeast geomorphic unit is relatively independent of sandy coast, hainan mannings riyuewan integrated resort island area for the erosion of sand quality, and the coast. Artificial island offshore artificial island reclamation type form, it is proposed to create a new type ", "artificial island, connected to land by sea-crossing bridge. Future ", "island and even runs out sea bay island bridge, will change the point position of the bay, moon bay arc sediment movement characteristics affect bay, bay caused by sediment according to the new wave dynamic field distribution; For reaching a new equilibrium, the coast along must be out of shape, and is likely to form the island bar, may also affect the whole riyuewan wave field, and may have a negative impact on riyuewan surfing conditions. And artificial islands north of about 1.8 km, there is a surf club, Asia’s largest artificial island construction may also cause the negative impact of surf conditions.Riyuewan roughly along toward NE-SW to sandy coast, has the basic characteristics of the development of south China coast also has its uniqueness. "Day" model of the artificial island beach evolution and its coastline trends in grasping the development general situation of the south China coast, according to the above research contents, integrated application of coastal dynamics, sediment movement mechanics and the knowledge of coastal dynamic geomorphology, the field investigation and remote sensing image analysis and numerical simulation methods, such as the artificial island engineering before and after the change of hydrodynamic, sediment, evolution trend analysis of seabed sediment, provide a reference basis for the construction of the new island riyuewan.After the completion of the "day" in this paper, through the quantitative analysis of the island riyuewan along the change of sediment discharge and the change of the coastline, caused by a lack of sea to sand, generally in a state of erosion, but different, coastal sediment characteristics is different. Overall not incident wave and the surf conditions. Island after construction, riyuewan beach about 5.5 years after the free time reaching a new equilibrium, the wave shadow even partial north island bridge will form the spit bulge on the coast, but do not form even island bar, erosion occurs mainly in the west coast of the island.In order to reduce the vertical breakwater wave reflection effect, reduce wave characteristics to its northeast surf zone project, the influence of optimizing its northeast dike structural, by raising the east coast seawall twist of king block king crest elevation and twist words block slope engineering measures, reduce the wave reflection intensity and environmental impact, to surf the waves and reduce engineering after day island off the coast side scour erosion intensity, protect underwater reef platform.