THE DISTRIBUTION CHARACTERISTICS OF AQUATIC ECOSYSTEM HEALTH IN NAKDONG RIVER BASINS BASED ON SPATIAL ANALYSIS

摘要

This study aims to analyze the trends and spatial distribution characteristics of aquatic ecosystem health in the nakdong river basin using the spatial autocorrelation. The distribution characteristics of the riparian habitat and physical-chemical factors that influence aquatic ecosystem are analyzed to provide information about the restoration through the ecological preservation. In situ data acquired between 2011 and 2013 are used to investigate and assess aquatic ecosystem health. In addition, in order to analyze the spatial distribution characteristics of the Nakdong River Basins health, Hotspot (Getis-Ord Gi,) and LISA (Local Indicator of Spatial Association) are utilized. According to the results of hotspot analysis for the aquatic ecosystem health of biological index, good health areas are indicated as the hotspot. These areas include the Andong dam, Wangpicheon, Imha dam. Coldspot areas include Nakdong Namhae, Nakdong downstream, Suyoung river basin. The results of LISA analysis are similar to the result of Hotspot analysis. But spatial outliers are shown in Gawha cheon, Hapcheon dam, upper Young river. These areas have a high biological health index, but the neighbor areas have a low biological health index. The spatial outliers areas need to be managed. The aquatic ecosystem health data can be used by analytical methods based on spatial information technology. The results of aquatic ecosystems based on the spatial analysis of the health data can be used to provide the information for river basin management.