In this study, we classified in river basins of Chugoku District and created a stream classification map by using GIS analysis and model based clustering. They are classified into 8 types. Then, we clarified basin characteristics of class A river based on above noted classification method. The results of clarification of basin characteristics are effective to express the basin characteristics. Furthermore, we found that faunas of genuine freshwater fish can be potentially explained by basin characteristics. From these, stream classification map can be applied for not only elucidation of water quality but also distribution of freshwater species.
In recent years, the forestation in rivers is one of the biggest pr oblems for river administrator. In this study, th e f actor analysis o n t he forestation about t he w illow a nd ba mboo communities in r ivers is conducted f or t he l ong-term a nd appropriate ma nagement. The twelve f irst-class rivers i n Ch ugoku District are divided into small drainage basins, where a rate of trees and seven parameters: distance from a weir, to tal n itrogen, to tal phosphorus, ma ximum discharge d ivided by ordinary di scharge, d istance between levees divided by average water s urface width, slope of t he river bed and be d deformation are allocated. The correlation a nalysis and t he cluster a nalysis between t he rate o f t he t rees an d t hese parameters were performed to f ind the c ontributing f actor o f t he f orestation i n rivers. These factor analyses indicate that the deformation of riverbed is a main f actor for the river for estation about t he willow.
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