Prediction Of Bed Form Height In Straight
And Meandering Compound Channels
Author(s)
R. D. Karamisheva, J. F. Lyness, W. R. C. Myers, J. O’Sullivan
& J. B. C. Cassells
Abstract
A comparative analysis was made of several prediction methods for bed form
dimensions. The prediction methods were applied to experimental data obtained
from the large-scale UK Flood Channel Facility. Inbank and overbank flows in
straight and meandering channels were studied. Comparisons between computed
and measured average bed form heights indicated that most formulae predict the
bed form height in straight channels better than in meandering channels. The
Karim [6] and the Van Rijn [10] methods gave the best predictions of the bed
form height for straight channels. For meandering channels, the Julien and
Klaassen formula [4] gave the smallest average discrepancy between the
predicted and the experimental bed form heights. Overall results indicated that
the Karim method [6] gives the best prediction of bed form height with an
average discrepancy ratio of 1.23 and 95% of the values within the range of 0.5–
2.0. For the studied data, the multiple regression analysis showed that the ratio of
bed form height and mean particle diameter, h/D, correlate best to the ratio of
dimensionless shear stress and Froude number.
Keywords: bed form dimensions, alluvial compound channels, bed form
prediction formulae.
1 Introduction
The accurate prediction of flow resistance in alluvial channels is very important
in hydraulic engineering practice. Flow resistance is difficult to quantify because
of the mutual interaction between the flow and the movable bed. The complexity
of hydraulic factors influencing the energy loss increases for overbank flows and
the meandering planforms of compound channels. The total resistance to flow is
Keywords
bed form dimensions, alluvial compound channels, bed form
prediction formulae.
Related Book
Other papers in this volume
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