前言青野川是位于伊豆半岛端部占南伊豆町大部分流域的二级河道。该地区经常遭到台风和集中暴雨的袭击,山岳地区又近临海洋,与流域面积相比河流断面小且水势湍急,过去经常发生水灾。特别是1976年7月由于暴雨集中产生了特大灾害,所以必须迅速采取根本性的河道整治措施。青野川河道整治工程由1977年开始到1982年竣工,几乎在全 INTRODUCTION Aoyo River is a second-class river located at the tip of the Izu peninsula in most watersheds of Minamiizu-cho. The area is often hit by typhoons and heavy rainstorms. The mountainous area is near the ocean. Compared with the drainage area, the river section is small and the water is very fast and flooding has been frequent in the past. In particular, in July 1976, due to the catastrophic concentration of heavy rainfalls, it was necessary to take radical river improvement measures swiftly. Qing Ye Chuan River Regulation Project from 1977 to 1982 completed, almost in the whole