Strategies for Measuring Fluid Mud Layers and Their Rheological Properties in Ports
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 143, Issue 4
Abstract
This study addresses the dynamics and navigability of fluid mud by considering the implementation of a nautical-bottom approach using a combination of several measurement techniques. The Port of Santos (Brazil) was used as the study area. In situ measurements were obtained using acoustic equipment, and direct observations were made through density profiles. Sediment sampling was also performed for grain size and rheological testing. The acoustic data indicated the presence of fluid mud in the inner portion of the canal. In this region, high spatial variability was found, where the fluid mud layer thickness ranged from a few centimeters to nearly 1 m, depending on the sand content. In addition, differences of up to 1 m were observed during the tidal cycle. The rheological tests revealed an increase in the yield stress toward the inner portions of the port. Coupling the density profiles with the rheological data allowed the estimation of a potential draft increase of up to nearly 1.5 m, depending on the location, nautical depth criterion, and tide condition.
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Acknowledgments
The authors thank CAPES—Ciências do Mar (09/2009) for financial support for field work; FAPERJ doctorate note 10 for the fellowship for the first author; LDSC/UFRJ (Project POLI 18254) for financial support; the SALT company and IPT for acoustic equipment; CNPq support granted to the third author; the PORTS 2016 Conference Organization and COPRI/ASCE for motivation and support; and Anna Dix for advisory help.
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Information & Authors
Information
Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 143 • Issue 4 • July 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Oct 27, 2016
Accepted: Dec 29, 2016
Published online: Mar 10, 2017
Published in print: Jul 1, 2017
Discussion open until: Aug 10, 2017
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