STUDIES ON RIVER EFFECTIVE MANAGEMENT IN THE MIDDLE AND SMALL RIVER-ANALYSIS OF RELATIONSHIP BETWEEN RIVER CHANNEL TYPE AND PROGRESS FACTOR-

Abstract

The purpose of this paper is to suggest progress of the middle and small river channels and how river types can conduct maintenance easily. Firstly, we conducted questionnaire survey about maintenance to river managers, surveyed 31 rivers and calculated the some parameters related to river channel morphology, basin area, friction velocity and so on, with GIS data and survey data.

As a result, there were highly correlations among mowing, inhabitant utilization and ease of maintenance. The types of those rivers were grouped at 6. High risk rivers, have high friction velocity, were the bar channel and the flat-floored bedrock channel constrained by revetment. Furthermore, ease of maintenance was different by the types of river channel. These results suggest that not only estimating from fluvial hydraulics but increasing use of inhabitant utilize can conduct the river maintenance effectively