Rolf E Aalto, University of Exeter, Geography, Exeter, EX4, United Kingdom, Daniel R Parsons, University of Hull, Energy and Environment Institute, Hull, United Kingdom, Christopher R Hackney, University of Hull, Energy and Environment Institute, Hull, HU6, United Kingdom, Jim Best, Univ. Illinois at Urbana Champaign, Geology, Geography & GIS, Mechanical Science and Engineering and Ven Te Chow Hydrosystems Laboratory, Champaign, IL, United States and Stephen E Darby, University of Southampton, Geography and Environmental Science, Southampton, SO14, United Kingdom