BED-LOAD SEDIMENT TRANSPORT ON STEEP LONGITUDINAL SLOPES

The results of new experiments on bed load transport on steep longitudinal slopes are presented. The experiments were carried out in a large tilting duct with a fine sand (median grain diameter of 208 micro m) covering the range of slope angles (beta) of +/- angle of repose for the sand (phi sub s) of 32 deg (0.56 rad). Measurements included bed shear-stress, flow discharge, and the sediment pickup rate on slopes. The results suggest that existing theories for bed load transport on slopes are not adequate for all bed slopes, and the new data are used to formulate a semiempirical relation that satisfactorily predicts the transport rate on horizontal as well as mild and steep slopes. The following are two important findings: correcting the threshold term (for slope) in the Meyer-Peter and Muller formula adequately describes the transport rate on positive slopes (elevation increasing in direction of flow) and on small negative slopes, while on steeper negative slopes an extra correction term is required, although the value of beta/phi sub s at which this term becomes necessary is a function of shear stress; and the influence of slope vanishes at high shear stresses.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/8672558
• Supplemental Notes:
  • The funding for parts of this work was provided by the Commission of the European Communities Directorate General for Science, Research, and Development as part of the MAST2 G8M Coastal Morphodynamics collaborative research program, under Contract Number MAS2-CT92-0027, and for other parts by the U.K. Ministry of Agriculture, Fisheries, and Food (Flood and Coastal Defence Division).
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Damgaard, J S
  • Whitehouse, RJS
  • Soulsby, R L
• Publication Date: 1997-12

Language

• English

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 1130-38
• Serial:
  • Journal of Hydraulic Engineering
  • Volume: 123
  • Issue Number: 12
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9429
  • Serial URL: https://ascelibrary.org/journal/jhend8

Subject/Index Terms

• TRT Terms: Fineness; Loads; Sand; Sedimentation; Shear stress; Slopes
• Uncontrolled Terms: Sediment transport
• Old TRIS Terms: Bed load
• Subject Areas: Highways; Hydraulics and Hydrology; I26: Water Run-off - Freeze-thaw;

Filing Info

• Accession Number: 00744160
• Record Type: Publication
• Contract Numbers: FBE 91-8, GR3/8235, MAS2-CT92-0027
• Files: TRIS
• Created Date: Dec 28 1997 12:00AM