VELOCITY DISTRIBUTION IN A STREET OR SIMILAR CHANNEL

MANNING'S FORMULA ALREADY HAS BEEN APPLIED TO THE DETERMINATION OF VELOCITY DISTRIBUTION IN THE FORM V = GY2/3, WHERE V IS THE VELOCITY IN A VERTICAL ELEMENT OF WATER CROSS SECTION, Y IS THE DEPTH OF THE ELEMENT, AND G IS A CONSTANT DEPENDING ON THE ROUGHNESS OF CHANNEL SURFACE AND THE CHANNEL SLOPE. IN THE REGION AFFECTED BY A CURB OR VERTICAL SIDE WALL, HOWEVER, THIS RELATIONSHIP GIVES IRRATIONAL RESULTS, SINCE THE MAGNITUDE OF VELOCITY AT THE WALL ACTUALLY MUST BE ZERO, WHEREAS THE EQUATION ABOVE YIELDS A FINITE VALUE. DIFFERENTIATION OF MANNING'S FORMULA, ON THE OTHER HAND, GIVES AN EQUATION REPRESENTING A LOCUS OF RATIONAL FORM FOR THE REGION NEARER THE SIDE WALL. THIS LOCUS AND THAT OF THE EQUATION GIVEN ABOVE, APPLIED TO THE PORTION OF THE CHANNEL MORE REMOTE FROM THE SIDE WALL, FORMS A COMBINED LOCUS WHICH AGREES APPROXIMATELY WITH EXPERIMENTAL RESULTS. THE DISCREPANCY IS SYSTEMATIC, HOWEVER, AND IS ATTRIBUTED TO THE NEGLECTED SHEAR BETWEEN WATER ELEMENTS. /AUTHOR/

  • Supplemental Notes:
    • Vol 34, pp 84-90, 6 FIG, 1 TAB
  • Authors:
    • Tapley, G S
    • Larson, C L
  • Publication Date: 1955

Media Info

  • Monograph Title: Proceedings of the Thirty-Fourth Annual Meeting of the Highway Research Board, Washington, D.C., January 11-14, 1955
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00228100
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jun 5 1972 12:00AM