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Aerial photography from Bluesky is being used to identify changes in sediment movement in upland river courses, to help assess the risk of flash flooding. In research centred on the English Lake District National Park, the imagery is helping map region-wide river erosion and sedimentation patterns. Using a Geographical Information System (GIS), Bluesky’s aerial maps, dating from 2003 and 2009, alongside older aerial photographs and historic Ordnance Survey maps, are being used to understand river channel change from 1850 to the present day. Rivers in upland regions are associated with greater rates of erosion and sediment transfer due to steep channel gradients, concentrated or ‘flashy’ storm discharges, and an active supply of material from surrounding hillsides. This can lead to changes in channel patterns and morphology, affect flood risk and impact on the surrounding landscape and environment. www.bluesky-world.com
