FRICTION FACTORS FOR FLOW IN SAND-BED CHANNELS

A NEW PREDICTOR IS DEVELOPED FOR FRICTION FACTORS OF FLOWS IN SAND-BED CHANNELS. A DIMENSIONAL ANALYSIS IS PURSUED TO OBTAIN THE FORM OF THE QUANTITIES ENTERING THE RELATION BETWEEN THE GEOMETRY OF THE BED FEATURES, THE FLOW PROPERTIES, AND THE EQUIVALENT SHEAR STRESS DUE TO THE FORM-DRAG OF THE RIPPLES, DUNES, ETC. THEORETICAL CONSIDERATIONS OF THE BED STABILITY LEAD TO EXPRESSIONS FOR THE LENGTH AND HEIGHT OF THE BED FEATURES IN TERMS OF THE PROPERTIES OF THE BED SEDIMENT AND FLOW. THESE ARE INTRODUCED INTO THE EXPRESSION YIELDED BY THE DIMENSIONAL ANALYSIS, AND THE RESULTING FRICTIONAL RELATION IS QUANTIFIED WITH FIELD AND LABORATORY DATA. THE GRAPHICAL RELATION OF LOVERA AND KENNEDY IS USED TO OBTAIN THE FLAT-BED FRICTION FACTOR. THE PREDICTOR IS EVALUATED USING FIELD DATA NOT INCLUDED IN PREPARATION OF THE GRAPHICAL RELATION BETWEEN THE BED-FORM FRICTION FACTOR, FROUDE NUMBER, AND RELATIVE ROUGHNESS. THE DEPTH-DISCHARGE RELATIONS PREDICTED ARE FOUND TO BE IN GOOD AGREEMENT WITH THE MEASURED DATA. /ASCE/

• Supplemental Notes:
  • Vol 95, No HY6, PROC PAPER 6900, PP 1973-1992, 9 FIG, 4 TAB,
• Authors:
  • Alam, A M
  • Kennedy, J F
• Publication Date: 1969-11

Media Info

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

Subject/Index Terms

• TRT Terms: Alluvium; Channel flow; Channels (Waterways); Dimensional analysis; Flow; Friction factor; Hydraulics; Roughness; Sand; Shear stress
• Uncontrolled Terms: Open channel flow
• Subject Areas: Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00204252
• Record Type: Publication
• Files: TRIS
• Created Date: Feb 9 1970 12:00AM