Study on the method of creating river flow diversity in small and medium-sized rivers by using large roughnesses

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560621
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Hydraulic engineering
• Research Institution: Nagoya Institute of Technology
• Principal Investigator: TOMINAGA Akihiro 名古屋工業大学, 工学(系)研究科(研究院), 教授 (60135530)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 河道多様性 / 流れ構造 / 河床変動 / 大粗度 / 巨石 / 水制 / 中小河川

Outline of Final Research Achievements

The methods of creating river flow diversity were investigated experimentally and numerically by using large roughnesses such as boulders and groins as an impact in straightened small and medium-sized rivers. Flow structures around the roughnesses were clarified when large roughness elements were placed in a straight open channel with various patterns. The river-bed configurations created by such large roughnesses were made clear and evaluated in the sense of river diversity and flood effect. Furthermore, focusing on spur dike as the large roughness, measures to reduce local scour and to control flow structure and sediment deposition in a riverside concavity were investigated. Then, the useful knowledge was obtained for creating diversified and ecologically rich river course.

Free Research Field

水工学