Bed-Load Sediment Transport in Woody Vegetated Channels

DOI Web Site 6 Citations 13 References
  • ISHIKAWA Yoshiharu
    Department of Forest Science, Faculty of Agriculture, Kyoto Prefectural University
  • FUIITA Hidenobu
    Department of Forest Science, Faculty of Agriculture, Kyoto Prefectural University
  • MIZUHARA Kunio
    Department of Forest Science, Faculty of Agriculture, Kyoto Prefectural University
  • NARUTOMI Yasushi
    Department of Forest Science, Faculty of Agriculture, Kyoto Prefectural University

Bibliographic Information

Other Title
  • 渓畔林をもつ河道における掃流砂量に関する研究
  • ケイハンリン オ モツ カドウ ニ オケル ソウリュウサリョウ ニカンスルケン

Search this article

Abstract

Recently, streamside forests have been preserved or restored in case of sediment and erosion control works for preserving the natural environment and for preventing sediment-related disasters. Many studies on streamside forests for function of sediment control have been done. However, further detailed study is required.<br>The purpose of this study is to improve the understanding of bed-load sediment transport rate in woody vegetated channels. Experiments were conducted about the bed-load transport rate in experimental flume in which cylinders, models of trees, with equi-spacing were settled in high density. Then, we have investigated the relation between the bed-load transport rate and the roughness concentration of models of trees. The results are summarized as follows;<br>(1)The dimensionless bed-load transport rate ΦB in woody vegetated channels is calculated using by dimensionless effective tractive force τ*e, dimensionless critical tractive force τ*c, and tractive force τ* using by the following equation, which is applicable in the experimental regions.<br>ΦB=5⋅τ*e3/2(1-τ*c/τ*)3/2<br>(2)As the roughness concentration of trees in channels increases, the dimensionless effective tractive force decreases.<br>(3)The dimensionless effective tractive force is estimated taking account of roughness concentration of trees by the following equations, <br>τ*e=βU2*/(σ/ρ-1)g⋅d=β×τ*<br>β=(2g)3/4n9/10/CD3/4×I3/10S3/2/q3/5D3/4<br>where, U*=friction velocity, σ=density of sediment, ρ=density of water, g=acceleration of gravity, d=meangrain size, β=coefficient of diminution, n=Manning's coefficient of roughness, CD=drag coefficient, I=gradient of riverbed (energy gradient), S=space of trees, D=diameter of trees, q=discharge of water per unit width.<br>These empirical equations are helpful to examine sediment transport in woody vegetated channels and design of adequate arrangement of streamside forests.

Journal

  • Sabo Gakkaishi

    Sabo Gakkaishi 51 (3), 35-43, 1998

    Japan Society of Erosion Control Engineering

Citations (6)*help

See more

References(13)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top