Study on the erosion mechanism of the soft rock by the flow of water and its application to the actual river

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560629
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Hydraulic engineering
• Research Institution: Waseda University
• Principal Investigator: SEKINE Masato 早稲田大学, 理工学術院, 教授 (60187854)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 粘着性土 / 軟岩 / 浸食 / 地形変動 / 移動床水理学 / 河川工学

Outline of Final Research Achievements

The cohesive materials which contained clay and had full compaction came to be exposed on actual riverbed, e.g., the Kinugawa River.　Due to this, it was reported that the erosion of an unprecedented scale occurred. In this study, a series of fundamental movable bed experiments were conducted to elucidate the mechanism of such cohesive sediment erosion. As a result, it was made clear what kind of change appeared for the erosion of the clay riverbed by sand and gravel which had been transported as bed load from upstream reach of river. In addition, the numerical prediction technique was newly developed. It enables us to predict a deformation of the bed or slope which contained clay. It was applied to a surface erosion phenomenon of the bare slope. And another flume experiments were conducted in order to verify validity of this technique. As a result, it was verified that the formation process of channel network on a slope can be predicted precisely by this technique.

Free Research Field

土木工学・水工学