Mapping Benthic Habitats in Delaware Bay and the Coastal Atlantic: Acoustic Techniques Provide Greater Coverage and High Resolution in Complex, Shallow-Water Environments |
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Authors: | Nicole A Raineault Arthur C Trembanis and Douglas C Miller |
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Institution: | (1) Coastal Sediments, Hydrodynamics, and Engineering Lab, Department of Geological Sciences, College of Earth, Ocean, and Environment, University of Delaware, 255 Academy Street, Newark, DE 19716, USA;(2) 232 Cannon Marine Laboratory, School of Marine Science and Policy, University of Delaware, 700 Pilottown Road, Lewes, DE 19958, USA |
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Abstract: | Accurate benthic habitat maps are critical for resource management in coastal waters with competing uses. We used a 500 kHz
phase-measuring bathymetric sonar (PMBS) and 900 kHz side-scan sonar to acquire seafloor data in estuarine and shelf environments.
Grab samples and remotely operated vehicle video created geological and biological classifications for segmented maps produced
by a backscatter clustering program. PMBS improves regional map resolution (<1 m), reduces the need for direct sampling, extends
information on sediment–biological relationships to larger areas, and allows measurements of bedforms. Auto-segmentation was
successful in environments with highly contrasting acoustic signatures and meters-scale homogeneity. Patchier communities
are identifiable in PMBS data. Species preferences for sediment (i.e., tubeworm preference for sediment without shell hash)
allowed us to determine potential habitat without identifying individual organisms in acoustic data. PMBS with sufficient
ground-truthing offers an efficient way to map seafloor characteristics, which is critical in marine spatial planning efforts. |
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