2009 Volume 15 Pages 1-6
This paper described the result of synthesized understanding of river environment using Quantification theory Type III and Cluster analysis. The twenty one river environment factors consist of physical, chemical, biotic, and river aesthetic were collected from 49 investigation points situated in twenty rivers categorized as main rivers in Kyushu. The result of qantitative analysis showed the classifications based on three quantitative axes, namely: riparian longitudinal location-axis (first axis), migration-axis (second axis), and diversity-axis (third axis), while the result of cluster analysis showed that 49 investigation points were classified into six groups. This study clarified that the particle size of river bed, benthic organism, ASPT and transparency gave high contribution on the first axis; the migration of aquatic animal and existence of weir were on the second axis; while flow and habitat structure condition highly contributed on the third axis.
