Discharge Ratios in Smooth and Rough Compound Channels
Publication: Journal of Hydraulic Engineering
Volume 123, Issue 3
Abstract
No entirely satisfactory method of estimating discharge capacity in compound channels and rivers has been developed. However, a large body of experimental data has now been acquired covering small-scale and large-scale laboratory compound channels as well as full-sized rivers. Two key ratios, namely total to bank-full discharge and main channel to floodplain discharge, have been shown by theoretical analysis to be significant and the available data have been analyzed to illustrate their behavior for smooth and homogeneously roughened compound shapes at various scales. The ratio of total compound section to bank-full discharge has been shown to be independent of bed slope and scale and to be a function of cross-sectional geometry only. The ratio of main channel to floodplain discharge is independent of bed slope and scale, but is influenced by lateral floodplain bed slope. The coefficients and exponents in equations relating the ratios to depth have been evaluated. It has been suggested that the use of these ratios may provide a comparatively simple method of discharge estimation in compact homogeneously roughened compound channels, and may be extended to other cases when more data are available.
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Information & Authors
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Published In
Journal of Hydraulic Engineering
Volume 123 • Issue 3 • March 1997
Pages: 182 - 188
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: Mar 1, 1997
Published in print: Mar 1997
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