Effective Roughness Of Bedforms
Author(s)
M. Li and B.A. O'Connor
Abstract
A CFD model, FLUENT, has been used to study steady turbulent flow over a
range of bed forms covering both ripples and dunes. The CFD model with
Reynolds stress closure (RSM) is shown to represent the main features of the
flow quite well with the error of effective roughness height (&,) within 10% of
measured values. The RSM approach was also found to be better than a k-e
closure. Use of the CFD model for a series of bedform shapes shows that the
prediction of form drag is better represented by methods based on addition of
Darcy friction factors (/',/" and/) than by roughness height subdivision
(&/, kg and &, ) as suggested by Van Rijn [17]. Engelund's [4] empirical
formula for/" was found to be a reasonable fit to the computer data but farther
testing is needed, particularly at field scale to confirm these results.
1 Introduction
Large-scale bedform
Keywords
Related Book
Other papers in this volume
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