Returning from our first dive off our new ancillary diving support boat, Glaucus. This new boat increases the capacity and flexibility of our diving work. With two coded vessels we can now operate separate diving operations simultaneously, while the fact that Glaucus can be moved by road allows us to work in locations outside of the coded range of Tritonia, our principal dive boat. ... See MoreSee Less
Underwater | Pontoon seabed
Dive technician at the NERC: Natural Environment Research Council UK NERC National Facility for Scientific Diving - NFSD here at SAMS, Andrew Mogg, shows us what lies beneath the pontoon based here at SAMS.
Structure from motion (SfM) photogrammetric survey of the SAMS Ocean Observatory. Ca. 100m2,, 6m depth, temperate winter conditions.
Stereophotogrammetry generates detailed, measurable 3D models from collections of 2D images. It is most widely used in aerial survey for cartographic purposes. Stereophotogrammetry can be used underwater to ‘capture’ objects and specimens for later digital analyses, conduct holistic surveys under challenging visibility and perform long-term rugosity and volumetric measurements.
There has been a pontoon situated here since WWII, with tyres used as fenders on boats and pontoons, it could be that many of the tyres have came from those sources.
A new paper has just been published which relied on NFSD support for much of the data collecting. The paper examines variability in kelp forest structure along a latitudinal gradient in ocean temperature; NFSD divers suported the work around Oban and in Orkney. dx.doi.org/10.1016/j.jembe.2016.10.023... See MoreSee Less
Subtidal forests comprised of kelps and other canopy-forming macroalgae represent critically important marine habitats. Kelp forests exhibit high rates of primary productivity, magnified secondary productivity, support high levels of biodiversity and provide various ecosystem services. Compared with...