FACTORS DETERMINING BED FORMS OF ALLUVIAL STREAMS

BASED ON THE ANALYSIS OF LABORATORY AND FIELD DATA ACCORDING TO SIMILARITY METHODS, IT IS FOUND THAT THE FOLLOWING VARIABLES ARE IMPORTANT IN DETERMINING THE BED FORMS OF SAND BED STREAMS: FLOW DEPTH (D), MEAN VELOCITY, DENSITY, AND VISCOSITY OF THE WATER; MEDIAN SIZE OF SEDIMENT (D SUB 50); AND THE ACCELERATION OF GRAVITY (G). THE DATA THUS ANALYZED ARE PRESENTED IN SIX GRAPHS OF D/D SUB 50 AGAINST FROUDE NUMBER FOR EACH OF SIX RANGES OF R SUB G EQUALS D SUB 50 X THE SQ ROOT OF (G X D SUB 50)/VISCOSITY, WHICH ACCOUNTS FOR THE EFFECTS OF SEDIMENT SIZE AND WATER VISCOSITY OR TEMPERATURE. FLUME DATA INDICATE THAT THE SIZE DISTRIBUTION OF THE BED SEDIMENT ALSO AFFECTS BED FORM, BUT THE EXTENT OF THIS EFFECT COULD NOT BE DETERMINED. THE EFFECT OF GRAIN SHAPE AND CHANNEL WIDTH ALSO COULD NOT BE DETERMINED WITH THE AVAILABLE DATA. A RELATION IS DEVELOPED BETWEEN R SUB G AND SHEAR VELOCITY/THE SQ ROOT OF (G X D SUB 50), WHICH PREDICTS QUITE WELL THE OCCURRENCE OF RIPPLE AND DUNE BEDS. /ASCE/

• Supplemental Notes:
  • PROC PAPER 10396 2 APP
• Authors:
  • Vanoni, V A
• Publication Date: 1974-3

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 363-77
• Serial:
  • Journal of the Hydraulics Division
  • Volume: 100
  • Issue Number: hy3
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Alluvium; Dune sands; Hydraulics; Sedimentation; Strata; Streambeds; Streams
• Old TRIS Terms: Beds /geology/; River beds
• Subject Areas: Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00204554
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 16 1974 12:00AM