MODELING OF BEDROCK EROSION CONSIDERING WET-DRY WEATHERING

• SUMNER Tamaki

  株式会社水工リサーチ

• INOUE Takuya

  寒地土木研究所 寒地河川チーム

• HITOMI Yoshiya

  株式会社ドーコン 地質部

• SHIMIZU Yasuyuki

  北海道大学工学研究院

Bibliographic Information

Other Title

• 乾湿風化を考慮した岩盤侵食モデルの構築

Abstract

 Bedrock exposure and erosion have caused the deterioration of the river structure's stability in many rivers. Previous studies reported that the collision of bedload is one of major factor controlling bedrock erosion. Furthermore, bedrock erosion has been concerned with wet-dry weathering and freeze-thaw. The bedrock erosional morphology can be classified into valley type, single water route type and multiple longitudinal groove type from the relationship between alluvial cover rate and bedrock strength. We conducted the needle penetration tests at the upstream of Oiranbuchi in Toyohira River where bedrock widely exposed. It is confirmed that the influence of weathering by wet-dry cycles due to tendency of low bedrock strength at the water's edge. In this study, we constructed the bedrock erosion model considering of wet-dry weathering and carried out the numerical simulations to evaluate the erosion morphology by weathering. The results suggest that bedrock is smoothed when erosion by weathering is dominant and bedrock incision progresses when abrasion by bedload is dominant.

Journal

• Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)

  Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74 (4), I_1045-I_1050, 2018

  Japan Society of Civil Engineers

Keywords

• bedrock
• erosional morphology
• numerical simulation
• wet-dry weathering

Details

• CRID: 1390564238095865600
• NII Article ID: 130007628156
• DOI: 10.2208/jscejhe.74.i_1045
• ISSN: 2185467X
• Web Site: https://www.jstage.jst.go.jp/article/jscejhe/74/4/74_I_1045/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed