Feldens, Peter, Schulze, Inken, Papenmeier, Svenja, Schönke, Mischa and Schneider von Deimling, Jens (2018) Improved Interpretation of Marine Sedimentary Environments Using Multi-Frequency Multibeam Backscatter Data. Geosciences, 8 (6). p. 214. DOI 10.3390/geosciences8060214.

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Abstract

Backscatter mosaics based on a multi-frequency multibeam echosounder survey in the continental shelf setting of the North Sea were compared. The uncalibrated backscatter data were recorded with frequencies of 200, 400 and 600 kHz. The results showed that the seafloor appears mostly featureless in acoustic backscatter mosaics derived from 600 kHz data. The same area surveyed with 200 kHz reveals numerous backscatter anomalies with diameters of 10–70 m deviating between −2 dB and +4 dB from the background sediment. Backscatter anomalies were further subdivided based on their frequency-specific texture and were attributed to bioturbation within the sediment and the presence of polychaetes on the seafloor. While low frequencies show the highest overall contrast between different seafloor types, a consideration of all frequencies permits an improved interpretation of subtle seafloor features.

Document Type:	Article
Research affiliation:	OceanRep > GEOMAR > Applied R&D > Energie und Rohstoffe Kiel University > Kiel Marine Science OceanRep > The Future Ocean - Cluster of Excellence Kiel University
Refereed:	Yes
Open Access Journal?:	Yes
Publisher:	MDPI
Projects:	Future Ocean
Date Deposited:	04 Feb 2019 12:17
Last Modified:	08 Feb 2021 07:30
URI:	https://oceanrep.geomar.de/id/eprint/45684

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