An overview of seabed-mapping technologies in the context of marine habitat classification☆

TLDR

Seabed‑mapping technologies are reviewed for their effectiveness in discriminating benthic habitats across spatial scales, noting that no single system captures all attributes but remote‑sensing interpretation can estimate many, and features such as bedform migration, scour, slope failure, and gas venting are readily detectable and aid habitat classification. The study tabulates the relationship between rapid continental shelf sedimentological processes, the seabed attributes that influence them, and the most suitable mapping system for detecting these processes at different spatial scales. Mapping systems detect seabed processes and features—including bedform migration, scour, slope failure, and gas venting—which are then used to assist habitat classification, and the authors present a framework linking these processes, attributes, and mapping systems across scales. Sediment grain size, porosity or shear strength, and sediment dynamics are identified as the most important seabed attributes controlling the benthic community of marine sands and gravel.

Abstract

Abstract A wide range of seabed-mapping technologies is reviewed in respect to their effectiveness in discriminating benthic habitats at different spatial scales. Of the seabed attributes considered important in controlling the benthic community of marine sands and gravel, sediment grain size, porosity or shear strength, and sediment dynamics were highlighted as the most important. Whilst no one mapping system can quantify all these attributes at the same time, some may be estimated by skilful interpretation of the remotely sensed data. For example, seabed processes or features, such as bedform migration, scour, slope failure, and gas venting are readily detectable by many of the mapping systems, and these characteristics in turn can be used to assist a habitat classification (and monitoring) of the seabed. We tabulate the relationship between “rapid” continental shelf sedimentological processes, the seabed attributes affecting these processes, and the most suitable mapping system to employ for their detection at different spatial scales.