The use of Benthic Terrain Modeler (BTM) in the characterization of continental shelf habitats

Oliveira, Natacha de; Bastos, Alex Cardoso; Quaresma, Valéria da Silva; Vieira, Fernanda V.

doi:10.1007/s00367-020-00642-y

Cited by 22 publications

(22 citation statements)

References 39 publications

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“…However, the training of a model to recognize trawl marks would be difficult because of the different shapes and scales involved (from holes with few decimeters in diameter to several-kilometer-long lines) [27]. In recent years, new methods based on morphological parameters to classify seafloor features on larger spatial scales were developed [28,29]. Since trawl marks are significant local depressions compared to the surrounding seafloor, parameters such as slope and bathymetric positioning index can be used for their visualization.…”

Section: Discussionmentioning

confidence: 99%

“…However, the morphological appearances of trawl marks comprise both linear depressions and isolated holes. Therefore, it is difficult to automatically derive a local trawling intensity from several interacting parameters, as has been suggested for ridges and valley bottoms [28][29][30]. A manual interpretation, on the other hand, is infeasible, especially when considering regular monitoring approaches to map the physical integrity of the seafloor over time.…”

Section: Discussionmentioning

confidence: 99%

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Quantifying the Physical Impact of Bottom Trawling Based on High-Resolution Bathymetric Data

2022

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Bottom trawling is one of the most significant anthropogenic pressures on physical seafloor integrity. The objective classification of physical impact is important to monitor ongoing fishing activities and to assess the regeneration of seafloor integrity in Marine Protected Areas. We use high-resolution bathymetric data recorded by multibeam echo sounders to parameterize the morphology of trawl mark incisions and associated mounds in the Fehmarn Belt, SW Baltic Sea. Trawl marks are recognized by continuous incisions or isolated depressions with depths up to about 25 cm. Elevated mounds fringe a subset of the trawl marks incisions. A net resuspension of sediment takes place based on the volumetric difference between trawl mark incisions and mounds. While not universally applicable, the volume of the trawl mark incisions is suggested as an indicator for the future monitoring of the physical impact of bottom trawling in the Baltic Sea basins.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Quantifying the Physical Impact of Bottom Trawling Based on High-Resolution Bathymetric Data

2022

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“…The Benthic Terrain Modeler (BTM) is a GIS classification approach that divides the seabed into geomorphic classes using derived terrain attributes (de Oliveira et al 2020;Lavagnino et al 2020;Menandro et al 2020). It was created by Oregon State University's Department of Geosciences in collaboration with the National Oceanic and Atmospheric Administration's (NOAA) GIS Integration and Development Program (Lundblad et al 2006;Wright et al 2007).…”

Section: Benthic Tranin Modelermentioning

confidence: 99%

Geomorphological classification of benthic structures of Kaledupa Atoll Wakatobi National Park, Indonesia

Setiawan¹,

Siregar²,

Susilo³

et al. 2022

Biodiversitas

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Abstract. Setiawan A, Siregar VP, Susilo SB, Mardiastuti A, Agus SB. 2022. Geomorphological classification of benthic structures of Kaledupa Atoll Wakatobi National Park, Indonesia. Biodiversitas 23: 3784-3792. Geomorphological mapping is one solution to understanding the complexity of the seabed pattern. This research aims to map the benthic structure of Kaledupa Atoll using the Remote Sensing and Geographic Information System with the Benthic Terrain Modeler (BTM) extension. The data used is in situ bathymetry data using Mapsounder 585 and Sentinel 2A satellite image data downloaded for free. BTM is a technique for examining benthic habitat and shallow water geomorphology. BTM was used to analyze integrated depth data to determine the bathymetric position index (BPI), slope, and classification of reef geomorphological structures. Thirteen structural classes of habitat geomorphology resulting from this research are Flat plain with the largest area of ??17142.35 ha, and the class with the smallest area is Crevices class, with narrow gullies rock outcrops 1.64 ha. While the other classes in a row are Broad slope 9104.53 ha; Flat ridge tops, upper slopes 4262.67 ha; Current scoured depressions on a slope 3420.98 ha; Narrow depressions at the base of rock outcrops 2348.20 ha; Rock outcrop highs, narrow ridges 1792.45 ha; Local ridges, boulders, pinnacles on slopes 879.29 ha; Scarp, cliff or small local depressions on a slope 703.02 ha; Local ridges, boulders, pinnacles on broad flat 490.17 ha; Local depressions, current scoured on flat 416.39 ha; Local ridges, boulders, pinnacles on broad depressions 16.63 ha; and Steep slopes 2.88 ha.

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“…The Abrolhos shelf presents a major width enlargement with mixed sediments along the coast, submerged reefs, rhodolith beds, and carbonate sediments along the inner and outer shelf. The Doce river Shelf receives a major riverine sediment input, associated with a regular and lobate seabed morphology, while the Paleovalley Shelf is characterized by a very irregular morphology and dominated by carbonate sedimentation, including extensive rhodolith beds and submerged reefs along the margin and flank of the paleovalleys (Vieira et al, 2019, Holz et al, 2020Oliveira et al, 2020).…”

Section: Site Selection Based On Regional Habitat Mappingmentioning

confidence: 99%

The role of benthic habitat mapping for science and managers: A multi-design approach in the Southeast Brazilian Shelf after a major man-induced disaster

Menandro

Lavagnino²,

Vieira³

et al. 2022

Front. Mar. Sci.

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Seabed mapping is currently the baseline information for ocean management and conservation, and is an indispensable item within research and Marine Spatial Planning. Here, we use a case study and published data along the southeast Brazilian continental shelf to illustrate the concepts and ideas of potential benthic habitat mapping and the importance of having maps on different scales and the potential for using a multi-design approach. The case analysis presented here uses a regional map and distinct criteria (seabed geodiversity and biodiversity, and potential influence of a tailings plume) to define three areas along the continental shelf to be mapped in a high-resolution, as part of a marine monitoring program. The background of the case study is a tailing dam failure disaster that led to the input of iron ore tailings in the ocean, leading to a major environmental disaster. Three areas were chosen, including: a Marine Protected Area (MPA Costa das Algas), a major fishing ground (the Doce River prodelta/depocenter), and an understudied reef area (Forgotten Reefs). Potential benthic habitat mapping was carried out using acoustic surveys (multibeam echosounder acquiring bathymetry and backscatter) and ground-truthing (sediment samples and seafloor image). Results detailed the potential habitats throughout the three areas, providing primary information for the study of benthic habitats and their distribution. The multi-design approach indicated that although a regional analysis can indicate potential vulnerability as a first assessment approach, high-resolution potential habitat mapping (herein, 20 m or finer) is beneficial to evaluate and produce a higher-confidence level for decision-makers. Having an overall view of what and where to collect new and finer data would be best to identify vulnerable areas that, in this case study, could be threatened by plume dispersion and tailings accumulation. Our results support the delineation of priority areas aiming for monitoring, protection and guiding for other studies, besides the consolidation of habitat importance and the integration of various datasets through a hierarchical classification scheme. Although Brazil has never produced a regional or national habitat map for the entire continental margin, there are already conditions to plan, execute and maintain a habitat mapping program, partnering with Universities, Government Institutions (e.g., the Brazilian Navy), and the private sector. In the context of the UN Decade of Ocean Science targets, it is urgent to plan and implement a national database capable of supporting a habitat classification effort on a broader national scale, with the flexibility to support a multi-design or a multi-scale approach.

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The use of Benthic Terrain Modeler (BTM) in the characterization of continental shelf habitats

Cited by 22 publications

References 39 publications

Quantifying the Physical Impact of Bottom Trawling Based on High-Resolution Bathymetric Data

Quantifying the Physical Impact of Bottom Trawling Based on High-Resolution Bathymetric Data

Geomorphological classification of benthic structures of Kaledupa Atoll Wakatobi National Park, Indonesia

The role of benthic habitat mapping for science and managers: A multi-design approach in the Southeast Brazilian Shelf after a major man-induced disaster

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