Research Article
Sep 1973
Subcritical Kinematic Flow in a Stable Stream
Publication: Journal of the Hydraulics Division
Volume 99, Issue 9
Abstract
An evaluation of the shallow water equations in the lower 6.9 miles (11.1 km) of a stable, gently sloped tributary to the Susquehanna River showed that subcritical kinematic flow exists. Although loops were suspected, single-value rating functions within small statistical error were established at four points along the stream. Also, single Manning n-values within very small statistical error were established at each point. It was shown explicitly, however, that use of a single-valued rating function does not permit simultaneous use of a single resistance coefficient or vice versa. Use of a single resistance coefficient independent of stage will induce a loop rating function. This apparent inconsistency was resolved by reformulating the characteristic equations in terms of the exponent of the single-valued rating function used. Therefore, for the special case of subcritical kinematic flows, streamflow synthesis may be accomplished without resort to extrapolation of uniform flow formulas to unsteady nonuniform flow.
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Published In
Journal of the Hydraulics Division
Volume 99 • Issue 9 • September 1973
Pages: 1433 - 1447
Copyright
© 1973 American Society of Civil Engineers.
History
Published in print: Sep 1973
Published online: Feb 3, 2021
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William J. Gburek, AM.ASCE
Res. Hydr. Engr., Northeast Watershed Res. Ctr., USDA-ARS, University Park, Pa
Donald E. Overton, AM.ASCE
Asst. Prof. of Civ. Engrg., Univ. of Tennessee, Knoxville, Tenn.; formerly Research Hydr. Engr., Hydrograph Lab., USDA-ARS, Beltsville, Md
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
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