정량·정성적 분석을 통한 하천등급 결정기준

Abstract

This study aims to develop new river-grade Decision criterion in Korea. The criterion has not been changed since the river law established in 1961. In recent, river-grade management which includes 3,893 rivers divided into national river, the first local river and the second local river has not properly worked to control the whole river system. The conflict between local governments has often happened. And Flood in the joint line of national river and local river has been periodically occurred in summer because of the unbalance of river barrier's height. It is inevitably necessary to adjust river-grade reflecting the influences of social conditions and the river's physical appearance such as multi-dam construction, river barrier to preventing from overflow, basin facility and so on. Accordingly, this study analysed these factors influencing to river's functions, that is, water supply, flood control and environment by quantitative and qualitative analysis statistically. Based on the result of the analysis, 12 factors influencing river's function and management are consequently selected. The most important factor in the analysis is river's dimension which recorded the highest point resulted in Delphi survey. Finally, the new river-grade adjustment criterion is created by those complicate processes and formed by three grades divided into national river, the first local river and the second local river. However, the amendment of river law is strongly required to adopt the above outputs in the near future.