Downstream Hydraulic Geometry For
Incised Channels
Author(s)
N. A. Hadadin
Abstract
The DEC Project data was used to develop several regression relationships for
incised channels (CEM Type IV or V). The shape factor that was developed for
downstream hydraulic geometry regression analysis of CEM Types IV and V
incised channel data is ψ= 0.206 0.114 29.39 s S d − . The shape factor (W/d) is directly
proportional to the bed material size and inversely proportional to the slope. The
effect of discharge on the shape factor is negligible. The physical meaning of
this equation is that small slopes and coarse grain sizes produce large
width/depth ratios, and steep slopes and fine grain sizes produce small
width/depth ratios. Two regression equations were developed for the hydraulic
geometry for top width and mean depth with 95% upper and lower confidence
interval for incised channels (CEM Types IV and V) in the DEC Project. There
were minor differences between the exponents of flow discharge and channel
slope between this study and the study of other investigators.
Keywords: shape factor, incised channel, hydraulic geometry, flow discharge,
width depth ratio.
1 Introduction
Downstream hydraulic geometry deals with variation in a cross section along a
stream, where cross-section form adjusts to accommodate the discharge and
sediment load supplied from the drainage basin, within the additional constraints
imposed by boundary composition, bank vegetation, and valley slope. A single
channel-forming discharge is assumed to represent the channel morphology at a
location, for various sites along the channel. Channel dimensions are not
arbitrary but are adjusted, through the processes of erosion and deposition, to the
quantity of water moving through the cross section so that the channel contains
Keywords
shape factor, incised channel, hydraulic geometry, flow discharge,
width depth ratio.
Related Book
Other papers in this volume
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