RESISTANCE TO FLOW IN ALLUVIAL CHANNELS

A direct method of predicting flow resistance and uniform velocity in alluvial channels is developed. The method covers all known bed-form regimes and not only eliminates trial-and-error computations and use of rigid-boundary channel flow formulas but also avoids the difficulties associated with the use of the various existing alluvial channel flow computation techniques. The study shows that the Darcy-Weisbach friction factor can be expressed as a unique function of the ratio of the bed form and grain shear stress components for any anticipated discharge and flow geometry, the bed-form shear component being uniquely determinable from the flow and channel material characteristics. The results confirm that the friction factor is nonconstant but varies with the bed-form regime. The applicability of the method to laboratory flumes, field canals, and natural rivers is illustrated.

• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Ilo, C G
• Publication Date: 1975-6

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 665-679
• Serial:
  • Journal of the Hydraulics Division
  • Volume: 101
  • Issue Number: HY6
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Alluvium; Flow resistance; Friction factor; Shear strength
• Old TRIS Terms: Bed formation; Channels; Discharge measurement
• Subject Areas: Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00097216
• Record Type: Publication
• Report/Paper Numbers: ASCE #11352 Proceeding
• Files: TRIS
• Created Date: Oct 18 1975 12:00AM