거제한산만의 굴 양식장에 대한 GIS 기반의 적지선정과 양식용량 산정

Abstract

GIS-based site selection and carrying capacity assessment for oyster culture can propose a solution for sustainability and systematic management. Site selection is a key factor in the aquaculture operation, affecting both success and sustainability and can solve conflicts between different activities, making a rational use of the coastal space. It could be obtained by GIS-based habitat suitability index, which was developed by USFWS. Estimating the carrying capacity of an area for oyster culture can be classified into four hierarchical categories, according to their level of complexity and scope, such as physical, production, ecological, and social carrying capacity. Most scientific effort to date has been directed towards modelling production carrying capacity and some of the resulting models have been used successfully. In case of ecological carrying capacity, the modelling of it is still in its infancy, because it has to consider all aspects of the interactions with other resources. As an alternative, there is a requirement for a set of ecological indicators for assessing the ecological performance of oyster cultures. After GIS-based site selection in GeojeHansan Bay, this study tried the estimating of ecological carrying capacity using ecological indicators. Clearance efficiency indicator showed the value of 0.331 which could represent the clearing ability by oyster cultures in GeojeHansan Bay. Filtration pressure indicator showed the value of 0.203 which could provide a guidance on the present level of culture development in regard to production and ecological carrying capacity in GeojeHansan Bay. According to the environmental characteristics and the present oyster cultures in GeojeHansan Bay, the newly assessed filtration pressure for the acceptable ecological carrying capacity was 0.102. Consequently, ecological carrying capacity in GeojeHansan Bay was 2,480 M/T, 25 ind./m3 and this represents the level of culture that can be introduced into GeojeHansan Bay without leading to significant changes to ecological process, species, populations or communities.