Site Selection Suitability Analysis Of Artificial Reefs Based On GIS And MCDM Models

Due to the rapid development of society and the increase of human needs,the intensity of human exploitation and utilization of the ocean continues to increase,which makes the ecological environment of the ocean continue to deteriorate,and the density of fishery resources decreases,which affects the sustainable development of marine resources.As an important sustainable development model in marine production,marine ranching plays an important role in restoring the marine ecological environment,protecting fishery resources,and promoting tourism development.An important part of the marine ranching is the construction of artificial reefs.Through different design structures,materials and stacking methods,the artificial reefs can improve or optimize the ecological environment of the sea areas where marine ranching are built,increase and maintain fishery resources,and enable the construction of marine ranching.The sea was restored.As a kind of offshore construction project,the material,design structure,stacking method,site selection,maintenance and management of artificial reefs affect whether the functions of artificial reefs can be efficiently realized.Among them,the site selection of artificial reefs It is the key factor for the success or failure of artificial reef construction.Scientific and reasonable sea areas can make artificial reefs exert their maximum ecological,economic and social benefits.Therefore,reasonable and scientific artificial reef site selection is carried out to avoid artificial reefs due to the phenomenon of environmental damage caused by mistakes is an important part of the scientific construction of artificial reefs.In this study,the site selection suitability of artificial reefs in the proliferation-type marine ranching,the recreational marine ranching and the conservation-type marine ranching was analyzed.Based on MCDM(multicriteria decision-making),the spatial analysis of geographic information system has carried out the site selection of artificial reefs of different types of marine ranching in Dalian Dachangshan Islands,Xiaoyao Bay and Jinshitan,and Xingshutun.sex research.Based on the literature and domestic and foreign artificial reef construction experience,41 site selection indicators were selected,and yaahp software was used to prioritize the selected 41 site selection indicators for different marine ranching.Finally,the evaluation indicators were selected for different types of marine ranching,and the weight of the indicators is calculated by MCDM,and the suitability analysis map is formed by calculating and superimposing the function of GIS,and the construction suitability is analyzed and evaluated.The results show that:(1)A total of 14 indicators were selected for the proliferation-type marine ranching: water depth,slope,dissolved oxygen,pH,phytoplankton biomass,zooplankton biomass,benthic biomass,inorganic nitrogen,active phosphate,chemical oxygen demand,Chlorophyll a,fishery resources in the sea area,ease of fishing,based on the suitability evaluation map of 14 indicators and the weights of each index,establish a preliminary suitability evaluation model through weighted calculation,and use Arc GIS raster calculator tool to calculate artificial labor in the research sea area.The weighted formula for the suitability value of fish reef site selection is as follows:SD = 0.2415C1 + 0.0209C2 + 0.2498C3 + 0.0571C4 + 0.0542C5 + 0.0418C6 + 0.0180C7 + 0.1564C8+ 0.0333C9 + 0.0111C10 + 0.0054C11 + 0.0560C12 + 0.0456C13 + 0.0091C14(2)A total of 12 indicators were selected for recreational marine ranching: water depth,transparency,pH,phytoplankton biomass,zooplankton biomass,benthic biomass,sulfide content,petroleum content,chlorophyll a,and marine fishery resources,tourism value,distance from fishing port or port based on the suitability evaluation map of 12 indicators and the weight of each indicator,establish a preliminary suitability evaluation model through weighted calculation,and use Arc GIS raster calculator tool to calculate the selection of artificial reefs in the research area.The site suitability value,the weighted calculation formula is as follows:SD = 0.1900C1 + 0.0782C2 + 0.0318C3 + 0.0182C4 + 0.0078C5 + 0.0680C6 + 0.0054C7 + 0.0319C8+ 0.0131C9 + 0.1073C10 + 0.4020C11 + 0.0403C12(3)A total of 13 indicators were selected for conservation-type marine ranching: water depth,sediment particle size,dissolved oxygen,phytoplankton biomass,zooplankton biomass,benthic biomass,inorganic nitrogen,sulfide content,petroleum content,Chlorophyll a,distance from power generation facilities and submarine cables,distance from pollution sources,and distance from submarine pipelines are based on the suitability evaluation map of 13 indicators and the weights of each index.The grid calculator tool calculates the site selection suitability value of artificial reefs in the study area,and the weighted calculation formula is as follows:SD = 0.2277C1 + 0.1045C2 + 0.0354C3 + 0.0312C4 + 0.0137C5 + 0.0696C6 + 0.0475C7 + 0.0211C8+ 0.0180C9 + 0.0914C10 + 0.0526C11 + 0.2639C12 + 0.02331C13(4)For the site selection of artificial reefs in proliferative,leisure and conservation marine ranching,the site selection suitability values of 2,2 and 3 areas in each corresponding research sea area are higher than 0.8,which is the most suitable area for the construction of artificial reefs in corresponding marine ranching.