| Marine resources are rich and varied,but due to various reasons the marine ecological environment has changed.Marine ecological environment protection and ecosystem balance have become hot topics for scholars from all walks of life.At the same time,they are also the focus of close attention of the country in recent years.Ocean ranching can effectively promote the recovery of damaged habitats and biomes,while also bringing about certain economic benefits.In order to give full play to the ecological effects and economic benefits of marine ranching,it is very important to choose suitable sea areas for the construction of marine ranching.Therefore,the appraisal of the suitability of marine ranching is the first important link that needs to be considered in the construction of marine ranching.This paper studies the spatial analysis model of sea suitability evaluation for marine ranching.The specific research work is as follows:(1)The principle of marine ranching construction norms is used as an indicator to determine the principles,and based on system theory,sustainable use theory,and ecological cybernetics as the theoretical basis,an evaluation index system for marine ranching land suitability is constructed.And AHP-Delphi comprehensive evaluation method is used to determine the weight of suitability evaluation index.(2)The water depth index and chlorophyll A index model are deeply studied by taking full advantage of the advantages of remote sensing imagery in quickly and widely extracting information.Calculate the comprehensive score of suitability,and combine with the two factors which are inferior water quality area and coastal port in the study area for elimination analysis.Study how to extract other indicators based on the basic information.(3)Make full use of the advantages of GIS and RS and combine with Web GIS related technologies to design a spatial analysis system prototype for marine ranching land suitability evaluation based on Arc GIS Engine and Arc GIS Server.It includes basic function modules and suitability spatial analysis modules.The basic function module realizes the service release of the management and suitability result data of ocean data.The suitability spatial analysis function module is comprehensively analyzed from four aspects: marine hydrological environment,marine water quality environment,marine biological environment,and spatial constraints.It achieves the grading of sea suitability for marine ranching and provides scientific and reasonable solutions for sea ranching.(4)According to the evaluation criteria of eco-environment,the suitability of the comprehensive scores of suitability was graded to obtain the spatial distribution map of sea suitable for sea ranching.The suitability results are classified into five categories: very suitable,more appropriate,suitable,inappropriate and very inappropriate.The results of the indicator model extraction are compared with the distribution status of the constructed marine ranching land in the study area and the actual environment of the sea area.The index model extraction results are basically consistent with the actual situation in the sea area of the study area.Finally,the causes of each suitability level result are analyzed in depth. |
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