Study On The Structure Of New Floating Breakwater Based On Sand Bank Erosion

Coastal zone is the land and ocean interactional zone,is the social and economic areas of the "golden zone",is also an important base for the development of marine development.However,the ecological environment is more vulnerable to storm surge,sea level rise and human activities,affecting the coastal people's production and life seriously,resulting in coastal factories collapsed,road interruption,coastal shelter forest damage,beach environment deterioration and salt fields,farmland submerged and so on.Therefore,the study of coastal protection measures for sandy coasts is of great practical significance in protecting coastal areas from damage.In this paper,the typical eroded area of Shihuzui in Laizhou Bay is selected as the research object.Through Investigated the field,the new type of floating breakwater— "?" type floating breakwater,is selected for coastal erosion protection.Compared to the traditional gravity breakwater has the advantages of light weight,low requirement of the foundation,simple installation,low structure cost,strong seawater exchange capacity and little impact on the ecological environment.It is friendly environment and low cost with the development potential of the breakwater structure type.By studying the literature and searching the data,the ocean hydrodynamic conditions of the study area were studied,and the ocean dynamic characteristics of the study area were mastered.The wave propagation performance of the reflection-type floating breakwater and the friction-type floating breakwater is analyzed respectively.The motion theory,the three-dimensional potential flow theory and the hydrodynamic performance of the floating breakwater are discussed.Based on the local environmental characteristics and the theory of floating breakwater,the floating breakwater is designed from the aspects of length,width,draft depth,mooring system and materials.The new floating breakwater is made of reinforced concrete material,and the length of each structure is 80 m,width is 8m and draft is 2.06 m.Internal hollow,the thickNess of 0.2m,along the length of every 4m plus 0.1m thick partition.In order to enhance the structure of the wave area,the extension of the two additional baffle,which eventually designed the structure of "?" type floating breakwater.The mooring cable adopts the synthetic fiber rope,which can withstand the large breaking load,set up a mooring cable every 24 m along the length direction,and there are 8 single,4 pairs of symmetry distributions on each side.The buoyancy,buoyancy and mooring force of the breakwater are calculated and analyzed.The buoyancy of the structure can be obtained under the action of the crest and the trough.The gravity and mooring force are obtained by the force analysis,and the feasibility of the floating breakwater is further studied.The numerical simulation is carried out by ANSYS software.The Hydrodynamic Diffraction and Hydrodynamic Response module in WORKBENCH are used to analyze the "?" type floating breakwater.The motion response and the transmission coefficient of the "?" type floating breakwater are studied,and compared with the traditional box type floating breakwater,the new type of floating breakwater has better wave elimination performance.The motion response and force of the structure under wave and wind are further analyzed.The calculated results show that the design structure has good wave-canceling performance and is feasible for local coastal protection.