CHANNEL VEGETATION MANAGEMENT METHOD IN KAKO RIVER CONSIDERING OF VEGETATION GROWTH CHARACTERISTICS

Abstract

In late years, There are many rivers facing flood-control problem and environmental problem caused by luxuriance of trees in the river channels. In the surrounding area of the sandbank where willows luxurianted in Kako river, flood damage was happen in typhoon 23rd in 2004.

Therefore, cutting all the trees is inappropriate in both aspects of environmental reservation and maintenance costs. In this study, growth characteristics of the willow in Kako river was analyzed, and the appropriate and effective management method of trees in a river channel, considering the influence of trees in a river channel to a water level rise, were proposed. It is also claimed the thinning intervals between trees in a river channel in this report.