IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 5: Environmental Hydraulics and Hydrology : Monitoring braided river morphodynamics with an acoustic doppler current profiler
Monitoring braided river morphodynamics with an acoustic doppler current profiler
Author : J. Brasington1, C.D. Rennie2, D. Vericat3, R. Williams1, B. Goodsell1, M. Hicks4, and R. Batalla5
Monitoring the spatial distribution of gravel bedload transport in complex braided morphologies is hampered by high spatial variability of sediment flux pathways, which respond to both local measures of flow competence and upstream sediment supply. Coupling observed morphodynamics with distributed measurements of sediment transport in braided rivers remains a key empirical research goal. For the ReesScan project on the Rees River, New Zealand, calibrated aDcp measurements of apparent bed velocity (va) will be used to: a) close a reach-scale morphological sediment budget, by monitoring bedload transport at a fixed cross-section; and b) study the coupled evolution of sediment transport pathways and short-term morphological evolution of distinct braidunits. The calibration of va has been based on concurrent va measurements and Helley-Smith bedload samples. In this paper we use calibrated va to map the spatial distribution of gravel-sand bedload transport through across a full channel section and along a braid-unit during the falling limb of a flood.
File Size : 1,471,130 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 5: Environmental Hydraulics and Hydrology
Date Published : 01/07/2011
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