Satellite Data Enhances Sea Rescue Operations

An innovative initiative aims to assist lifeboat crews in saving lives within the dynamic waters of the Solway Firth by utilizing information transmitted from space. This region, situated off the south of Scotland coast, is deemed hazardous because it experiences some of Europe’s most rapid tidal movements. Extensive mudflats encircle the estuaries of the River Nith and River Annan, where numerous locations are susceptible to quicksand. A pilot program is exploring whether satellite imagery can enable rescuers to traverse these waters more rapidly to reach individuals in distress. Even advanced marine navigation charts currently available may contain unmapped or blank sections. This limitation hinders rescue services from ensuring safe access without the danger of their own personnel becoming casualties. Nith Inshore Rescue approached the University of Strathclyde with a proposal to employ satellite imagery for pinpointing navigable channels in unmapped waters. This independent volunteer lifeboat service operates in the Upper Solway and Dumfries area, with its base located at Glencaple in Dumfries and Galloway. The Safe Passage project, which receives funding from the European Space Agency (ESA), involves a university research team utilizing the estuary as a test location. They are examining the application of synthetic aperture radar (SAR) data from satellites to offer consistent, precise mapping of shifting channels within the coastal zone. This technology can distinguish between sand and water and functions effectively even at night or in overcast weather, enabling the lifeboat to maintain a reliable minimum depth along its path. Previously, crew members were required to perform manual depth soundings; however, during adverse weather and periods of strong tides, these routes change quickly, rendering a previously charted path potentially unviable. Incorrect data can necessitate the lifeboat altering its course during a rescue operation, thereby delaying the response and potentially leading to the vessel running aground. Prof Malcolm Macdonald, chairman of applied space technology at the University of Strathclyde, stated: “The work investigates the alternatives to provide regular mapping of the intertidal zone, enabling these teams to reach casualties without becoming casualties themselves.” He added, “They need to get to the scene as safely and quickly as possible.” He noted, “The crews were manually depth-gauging the flats every fortnight but they can change on an almost daily basis.” He indicated that the new system offers several benefits for the region. He clarified, “Optical satellite data – similar to how your phone works – works well in other parts of the world, but on the west coast of Scotland, you get predominantly pictures of clouds.” He continued, “Radar data penetrates the cloud but can be difficult to interpret, and so we started looking at how we could use that data.” The volunteers now obtain updated charts featuring waypoints generated from satellite imagery. These routes have already been employed in actual rescue operations, including a successful response on the Cumbrian coast for two individuals stranded in a car due to coastal flooding. While the route charts are supplemented by the crew’s expertise and local understanding, climate change is progressively complicating this. The team is currently collaborating with ESA to enhance the charting and anticipates that this system could improve accessibility for the 13 million hectares of tidal flats globally. Gwilym Gibbons, a crew member with Nith Inshore Rescue, stated: “To see and test the results of the work in a real environment as an additional aid has already proved the huge potential this could have across the world.“ He added, “Our ambition is for Safe Passage to become a commercial navigation data feed service for a range of marine navigation uses, with a proportion of revenues generated going to support the vital work of our wholly volunteer lifeboat services.” He concluded, “It’s literally saving lives at sea from space.” Copyright 2024 BBC. All rights reserved. The BBC bears no responsibility for the content of external websites. Information regarding our approach to external linking is available.