FLOW STRUCTURE AROUND TWO ROWS OF CYLINDRICAL RODS IN VEGETATED FLOODPLAIN OF A COMPOUND CHANNEL
Authors:James Ball Organization:IAHR
In this paper,an experimental study is presented to understand the effect of trees on the structure of turbulent flow in a vegetated flood plain.To simulate trees in vegetated bank,two rows of vertical rods were attached on the floodplain.Two-dimensional velocity fluctuation around the rods was measured using PIV.The coherent turbulent flow structure or bursting events and associated shear stresses play an important role in sediment entrainment and bed instability in an open channel.The bursting analysis is used to find the turbulent flow structure at different cross section behind the rods.For the experimental test,the contribution probability of bursting events to the Reynolds shear stress was computed at different points of the flow depth.It was found that the probability of outward inteaction and sweep events is higher than ejection and inward interaction events at 60 mm depth level above the bed.Also,the distribution of ejection event was found uniform in flow field over the flood plain.The probability of outward interaction is high at area close to the edge of flood plain,however,the probability of sweep event is high at the middle of flood plain and behind the piles.The turbulent kinetic energy at different points was computed from velocity fluctuations and the average turbulent energy showed a significant variation from upstream to downstream of the piles.
Title: FLOW STRUCTURE AROUND TWO ROWS OF CYLINDRICAL RODS IN VEGETATED FLOODPLAIN OF A COMPOUND CHANNEL
Event: 3rd IAHR Europe Congress2014年10月01-01日
James Ball

School of Civil and Environmental Engineering, UTS

IAHR

James Ball is a member of the School of Civil and Environmental Engineering at UTS. His research interest include development and application of catchment models. He is currently a Vice-President of IAHR and participates in the IAHR Committees on Hydroinformatics and Urban Drainage (Joint Committee with IWA). He is also a Fellow of Engineers Australia and has been a co-opted member of their National Committee on Water Engineering for numerous years. Additionally, he was the Editor responsible for the current revision to the Australian Guidelines for flood estimation - Australian Rainfall and Runoff - that was published in 2016. Also, he is the Editor-in-Chief for the International Journal of River Basin Management, an Editor for Water Science and Technology, and a member of the editorial boards for the Urban Water Journal, the Journal of Hydroinformatics, and the Australian Journal of Water Resources. ... More
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