ORCID Profile
0000-0002-4030-4864
Current Organisations
The Geological Survey of Norway (NGU)
,
NIWA - The National Institute of Water and Atmospheric Research Ltd.
,
Singapore Institute of Manufacturing Technology
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Publisher: Springer Nature Switzerland
Date: 2023
Publisher: Springer Science and Business Media LLC
Date: 28-05-2016
Publisher: Schweizerbart
Date: 08-2016
Publisher: Wiley
Date: 09-07-2014
DOI: 10.1002/ESP.3615
Publisher: MDPI AG
Date: 26-04-2020
DOI: 10.3390/RS12091371
Abstract: Modern multibeam echosounders can record backscatter data returned from the water above the seafloor. These water-column data can potentially be used to detect and map aquatic vegetation such as kelp, and thus contribute to improving marine habitat mapping. However, the strong sidelobe interference noise that typically contaminates water-column data is a major obstacle to the detection of targets lying close to the seabed, such as aquatic vegetation. This article presents an algorithm to filter the noise and artefacts due to interference from the sidelobes of the receive array by normalizing the slant-range signal in each ping. To evaluate the potential of the filtered data for the detection of aquatic vegetation, we acquired a comprehensive water-column dataset over a controlled experimental site. The experimental site was a transplanted patch of giant kelp (Macrocystis pyrifera) forest of known biomass and spatial configuration, obtained by harvesting several in iduals from a nearby forest, measuring and weighing them, and arranging them manually on an area of seafloor previously bare. The water-column dataset was acquired with a Kongsberg EM 2040 C multibeam echosounder at several frequencies (200, 300, and 400 kHz) and pulse lengths (25, 50, and 100 μs). The data acquisition process was repeated after removing half of the plants, to simulate a thinner forest. The giant kelp plants produced evident echoes in the water-column data at all settings. The slant-range signal normalization filter greatly improved the visual quality of the data, but the filtered data may under-represent the true amount of acoustic energy in the water column. Nonetheless, the overall acoustic backscatter measured after filtering was significantly lower, by 2 to 4 dB on average, for data acquired over the thinned forest compared to the original experiment. We discuss the implications of these results for the potential use of multibeam echosounder water-column data in marine habitat mapping.
Publisher: Public Library of Science (PLoS)
Date: 13-05-2014
Publisher: Springer Science and Business Media LLC
Date: 03-01-2018
Publisher: Elsevier BV
Date: 12-2015
Publisher: Springer Science and Business Media LLC
Date: 31-01-2018
Location: New Zealand
Location: No location found
No related grants have been discovered for YAJUAN SUN.