DISTRIBUTION OF TRACTIVE FORCE IN OPEN CHANNELS

THE DESIGN OF ALLUVIAL CHANNELS BY THE TRACTIVE FORCE METHOD REQUIRES INFORMATION ON THE DISTRIBUTION OF WALL SHEAR STRESS OVER THE WETTED PERIMETER OF THE CROSS SECTION. THE PRESENT STUDY WAS UNDERTAKEN IN ORDER TO PROVIDE SOME DETAILS ON ACTUALLY MEASURED SHEAR DISTRIBUTIONS AND, HENCE, TO CHECK THE VALIDITY OF CURRENTLY AVAILABLE DESIGN INFORMATION. THE LATTER IS ENTIRELY ANALYTICAL IN ORIGIN AND IS BASED EITHER ON THE ASSUMPTION OF LAMINAR FLOW OR ON OVERSIMPLIFIED MODELS OF TURBULENT CHANNEL FLOW. THE EXPERIMENTS WERE CARRIED OUT IN A SMOOTH-WALLED LABORATORY FLUME AT VARIOUS ASPECT RATIOS OF THE RECTANGULAR CROSS SECTION. WALL SHEAR STRESS WAS DETERMINED WITH PRESTON TUBES WHICH CALIBRATED BY A METHOD EXPLOITING THE LOGARITHMIC FORM OF THE INNER LAW OF VELOCITY DISTRIBUTION. RESULTS ARE PRESENTED WHICH CLEARLY SUGGEST THAT NONE OF THE PRESENT ANALYTICAL TECHNIQUES CAN BE COUNTED UPON TO PROVIDE ANY PRECISE DETAILS ON TRACTIVE FORCE DISTRIBUTIONS IN TURBULENT CHANNEL FLOW. /ASCE/

• Supplemental Notes:
  • Vol 96, No HY 7, PROC PAPER 7415, PP 1469-1483, 7 FIG,
• Authors:
  • Kartha, V C
  • Leutheusser, H J
• Publication Date: 1970-7

Media Info

• Serial:
  • Journal of the Hydraulics Division
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Channel flow; Flow; Hydraulics; Measuring instruments; Open channels; Shear stress; Tractive forces; Turbulence
• Candidate Terms: Turbulent flow
• Uncontrolled Terms: Open channel flow
• Subject Areas: Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00204299
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 26 1970 12:00AM