Browse > Article
http://dx.doi.org/10.3741/JKWRA.2016.49.6.529

Estimation methods of maximum scour depth in steep gravel-bed bend channel  

Cho, Jaewoong (Dept. of Civil Eng., Gangneung Wonju National University)
Nam, A-Reum (River&Tech Co.)
Woo, Tae Young (Dept. of Institute of Technology, BAU Consultant Co., LTD.)
Park, Sang Deog (Dept. of Civil Eng., Gangneung Wonju National University)
Publication Information
Journal of Korea Water Resources Association / v.49, no.6, 2016 , pp. 529-536 More about this Journal
Abstract
The existing methods to estimate the maximum scour depth in the bend of steep gravel bed channel have been evaluated by the hydraulic movable-bed experiments. In the $90^{\circ}$ bend steep-slope channel paved with the fluvial gravels which are uniform in size and have a mean diameter of 43mm, the maximum scour depths due to the flow discharge and the gradient of bed slope have been investigated and compared with the scour depth computed from the equations. The local scour has occurred in conditions that the bed slope is steeper than 0.02 and the $F_r$ is greater than 0.95. Except Lacey's equation and Zeller's equation, the existing methods computing the maximum scour depth overestimate the maximum scour depth in the steep channel with the very coarse gravel bed. However, Lacey's equation with the bed material size and Zeller's equation considering the approach channel gradient and the bend angle may be relatively used to estimate the scour depth in bend of the steep gravel-bed river.
Keywords
Channel bend; Scour depth; Steep channel; Gravel riverbed; Hydraulic experiment;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Blench, T. (1969), Mobile-Bed Fluviology, University of Alberta Press, Edmonton.
2 Brown, S.A., and E.S. Clyde (1989), Design of Riprap Revetment, Hydraulic Engineering Circular No. 11, FHWA-IP-89-016, Prepared for the Federal Highway Administration, Washington, D.C..
3 Ko, J.U. (1975), "A Study on fluvial phenomena in the Bended Alluvial Rivers", Journal of Korea Water Resources Association, Vol. 8, No. 2, pp.75-80.
4 Lacey, G., Stable Channels in Alluvium, Proceedings of the Institute of Civil Engineers, v. 229., 1930.
5 Lane, E. W. (1957), A Study of the Shape of Channels Formed by Natural Streams Flowing in Erodible Material, Missouri River Division Sediments Series No. 9, U.S. Army Engineer Division, Missouri River, Corps of Engineers, Omaha, Nebraska.
6 Langbein, W.B. and L.B. Leopold (1996), River Meanders - Theory of Minimum Variance, USGS Professional Paper 422-H.
7 Laursen, E.M. (1960), Scour at Bridge Crossings, May, Journal Hydraulic Division, ASCE, v. 92, No. HY3.
8 Leopold, L.B., and M.G. Wolman (1960), River Meanders, Geologic Society of America Bulletin, v. 32, pp. 769-794.
9 Liu, H.K., F.M. Chang, and M.M. Skinner (1961), Effect of Bridge Construction on Scour and Backwater, Department of Civil Engineering, Colorado State University, Report Number CER60HKL22.
10 Mussetter, R. A., Lagasse, P.F., Harvey, M.D., and Anderson, C.E. (1994), Sediment and Erosion Design Guide, November, prepared for the Albuquerque Metropolitan Arroyo Flood Control Authority, RCE Reference Number 90-560.
11 Pemberton, E.L. and Lara, J.M. (1984). Computing Degradation and Local Scour, Technical Guideline for Bureau of Reclamation, Engineering and Research Centre, Bureau of Reclamation, Denver, Colorado, USA.
12 Richardson, E.V., L.J. Harrison, and S.R. Davis (1991), Evaluating Scour at Bridges, FHWA-IP-90-017, Hydraulic Engineering Circular No. 18, U. S. Department of Transportation, FHWA, Turner Fairbanks Highway Research Center, McLean, Virginia.
13 Simons, Li & Associates, Inc. (1989a), Design Guidelines & Criteria, Channels & Hydraulic Structures on Sandy Soil, June, prepared for Urban Drainage and Flood Control District, Denver, Colorado and The City of Aurora, Colorado.
14 Simons, Li & Associates, Inc. (1989b), Standards Manual for Drainage Design and Floodplain Management in Tucson, Arizona, December, prepared for the City of Tucson Department of Transportation, Engineering Division.
15 Song, J.W. Choi, I.H., and Kim, J.H (1994)., "A Study on Selected Transverse Bed Slope Models in Channel Bend", Journal of The Korea Society of Civil Engineers, Vol. 14, No. 6, pp.1395-1404.
16 U.S. Army Corps of Engineers (1993), Velocity and Scour Prediction in River Bends, Waterways Experiment Station.
17 Zeller, M.E. (1981), Scour Depth Formula for Estimation of Toe Protection Against General Scour, Pima County Department of Transportation and Flood Control District, Tucson, Arizona.
18 Yoon, S.E., Lee, J.T. (1990), "Flow Characteristics for the Variation of Radius of Curvature in Open Channel Bends", Journal of Korean Association of Hydrological Sciences, Vol. 23, No. 3, pp.435-444.