Clarification of sediment dynamics during flooding and its application to the river engineering

2014 Fiscal Year Final Research Report

• Project/Area Number: 24760402
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Hydraulic engineering
• Research Institution: Public Works Research Institute
• Principal Investigator: YOROZUYA Atsuhiro 独立行政法人土木研究所, その他部局等, 研究員 (00314740)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 土砂動態 / 河川水流量観測 / 河床変動 / 河床高自動計測 / aDcpの活用

Outline of Final Research Achievements

This study aimed to understand sediment dynamics during flooding in rivers, as well as application to the river engineering. This study developed the discussion based on observational results as well as the classic sediment hydraulics. The observation was conducted at one of the steepest river using the non-contact current meter for velocity, multiple water gauges for water surface slope, and echo sounder for river bed elevation change. Based on those observed results, types of micro-scale bed form were analyzed depending on the flow stages applying the knowledge of hydraulic resistance of alluvial streams. In addition, estimation of river bed evolution was carried out with the hydraulic resistance, whose results were fairly reasonable compared with the observed results. Finally, this study developed the methodology to estimate the flow discharge considering the river bed elevation change based on the water surface information, such as water surface velocity/slope.

Free Research Field

河川工学