THE HIDING EFFECT OF LARGER GRAVELS AMONG BOULDERS ON SMALLER SAND

• SEKINE Masato

  早稲田大学理工学術院

• NAKAMA Ryota

  早稲田大学大学院 創造理工学研究科 建設工学専攻

Bibliographic Information

Other Title

• 大礫の間隙に存在する大粒径砂礫が小さな砂に及ぼす遮蔽効果

Abstract

 In this study, we investigated the hiding effect of larger gravels on smaller sand which occurs on the riverbed containing boulders. Riverbed materials can be classified into three grain-sizes groups of sediment: boulders which cannot move at all, gravels which move on riverbed as bedload, and fine sand which move as suspended load. These sediment groups are called L-, M- and S-particle. L-particles exert hiding effect on M- and S- particles. As well, larger M-particles exert hiding effect on smaller particles. We conducted the experiments under the condition that sediment which transport on riverbed is composed of two grain sizes particles. From the results of the experiments, a formula expressing the hiding effect of larger gravels was derived. The other experiments were conducted under the condition that movable sediment is composed of three grain sizes particles. Then we investigated the applicability of the hiding effect formula of larger gravels.

Journal

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

  Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 76 (2), I_1141-I_1146, 2020

  Japan Society of Civil Engineers

Keywords

• hiding effect
• bed load
• suspended load
• vertical sorting
• grain size distribution

Details

• CRID: 1390571704643134208
• NII Article ID: 130008122536
• DOI: 10.2208/jscejhe.76.2_i_1141
• ISSN: 2185467X
• Web Site: https://www.jstage.jst.go.jp/article/jscejhe/76/2/76_I_1141/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed