Subdivision Froude number
Abstract
A Froude number that is applicable to subdivisions of a cross section is developed assuming onedimensional flow. The subdivision Froude number is shown to be an accurate index of the flow regime in subdivisions of a cross section. An imaginary Froude number in a flood plain indicates that the velocity is increasing with depth and that a onedimensional flow assumption may be invalid. Mixed flow regimes at a cross section which invalidate assumptions associated with the standard step method can be recognized with the subdivision Froude number. A total of 193 cross sectiondischarge combinations were tested with a modified version of HEC2; 11 had a mixed flow regime and 36 had at least 1 imaginary Froude number.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 October 1985
 Bibcode:
 1985STIN...8618674S
 Keywords:

 Channel Flow;
 Flood Plains;
 Froude Number;
 One Dimensional Flow;
 Subdivisions;
 Depth;
 Flow Velocity;
 Standardization;
 Fluid Mechanics and Heat Transfer