NDLI: Sediment classification based on repetitive multibeam bathymetry surveys of an offshore disposal site

Content Provider	IEEE Xplore Digital Library
Author	Preston, J.M. Parrott, D.R. Collins, W.T.
Copyright Year	2003
Description	Author affiliation: Quester Tangent Corp., Sidney, BC, Canada (Preston, J.M.)
Abstract	A disposal site near Saint John, New Brunswick, Canada, has been surveyed at six-month intervals for the past three years with Simrad EM3000 multibeam bathymetry systems. Analysis of the bathymetry data from surveys in the autumn show accumulation of sediments over the site due to disposal activities in the summer and autumn; surveys in the spring show that the sediment has undergone transport and redistribution due to the effects of currents and waves over the winter months. Quantitative measures of sediment accumulation and erosion have been made and show definite changes in the nature and distribution of the disposal pile. Acoustic backscatter data collected simultaneously with four of these surveys were analyzed with the QTC MULTIVIEW/spl trade/ software, which segmented the multibeam sonar images into six regions of homogeneous acoustic character. The Multiview process leading to the six classes is described. Seafloor grab samples and photographs were used to characterize these acoustic classes physically. The depths and the classes were interpolated onto the same grid to allow subtractions and comparisons. Interpolating classes was done with a categorical interpolation process. Comparisons among the sequence of maps of acoustic classes show the spreading of new spoils and consistent seasonal changes over large areas. Because high-frequency backscatter depends heavily on surface conditions, seasonal changes in the local hydrodynamic regime could be responsible for these changes in acoustic character.
Sponsorship	Dept. of the Navy Sci. and Technol. Coalition for Enhanced Marine Resources Orincon Ceros Harbour Offshore Inc
Starting Page	69
Ending Page	75
File Size	749075
Page Count	7
File Format	PDF
ISBN	0933957300
DOI	10.1109/OCEANS.2003.178523
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-09-22
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	MTS
Subject Keyword	Sediments Backscatter Springs Acoustic measurements Image analysis Image segmentation Sonar measurements Sea floor Interpolation Hydrodynamics
Content Type	Text
Resource Type	Article

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