Flow Field and Morphology Mapping Using ADCP and Multibeam Techniques: Survey in the Po River
Publication: Journal of Hydraulic Engineering
Volume 137, Issue 12
Abstract
An 8-km-long and 250-m-wide reach of the Po River (Italy) was surveyed with two vessels, aiming to investigate the channel morphology and flow field characterizing this major Italian river and to provide data for the calibration of a numerical model. The first vessel was equipped with a multibeam ecosounder (MBES), whereas an acoustic doppler current profiler (ADCP) was located on the second one. Fixed-vessel ADCP measurements were used to preliminarily investigate the turbulence variability affecting the reliability of moving-vessel measurements. To evaluate the friction velocity by using moving-vessel measurements, the vertical variance of velocity profiles as an alternative to logarithmic fitting of ADCP profiles was estimated. An average of 30-m cells of depth-averaged velocity, friction velocity, and surface-bottom velocity angle are presented in maps as the most relevant flow field features. The flow field and channel morphology at bed-form or channel scales showed noticeable correlations (0.9). In particular, a correlation between the friction velocity and small-scale bed forms (4–5 m mean wavelength) was observed.
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Acknowledgments
The writers are grateful for the field and survey support of Interregional Agency for Inner Navigation (ARNI), in particular for the expertise of Luca Crose, who was responsible for the multibeam measurements at ARNI.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 137 • Issue 12 • December 2011
Pages: 1576 - 1587
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Nov 12, 2009
Accepted: May 20, 2011
Published online: Jul 29, 2011
Published in print: Dec 1, 2011
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