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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Experimental study flow characteristics in real-scale meandering river channel
Experimental study flow characteristics in real-scale meandering river channel
Author :
ABSTRACT
Flow characteristics in the meandering river channel have been well studied in terms of experimental and numerical
perspective. However, most of experimental studies to figure out flow and turbulent characteristics in meandering
channel have been conducted on the small-scale of laboratory experiment. Few field experiments have been conducted
because of the lack of proper in-situ instruments to capture three-dimensional flow and no flow controllable site. This
study applied the recent advancement of acoustic instruments as well as real-scale meandering river channel to find out
the mechanics of flow in various meandering conditions in bigger scale. ADCPs were applied to derive secondary flow in
the successive cross-sections and validated them in conjunction with field ADV measurements. In particular, the
longitudinal pattern of maximum velocity and depth along the bend were investigated to look inside the details of the flow
variation driven by meandering of channel. Structure of longitudinal velocity profiles revealed that the flow profiles alters
along the location in the bend and mostly did not follow conventional velocity law such as log-law. Turbulent flow and
bed shear stress distribution in conjunction with scouring process in the meandered channel were scrutinized in terms of
their interaction. The development of secondary current and its strength caused by meandering showed that they are
much more complicated than the results from laboratory experiments. Overall, the hydrodynamic and morphologic
process in the meandering channel in this study indicated that they are substantially different from those from the smallscale
laboratory experiments.
File Size : 644,323 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 18/08/2015
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