1. (IAHR Member), Research Associate, Department of Civil, Environmental and Geomatic Engineering, University College London, London, UK
2. (IAHR Member), Professor, Department of Civil, Environmental and Geomatic Engineering, University College London, London, UK(author for correspondence)
3. Research Associate, Department of Civil, Environmental and Geomatic Engineering, University College London, London, UK
4. (IAHR Member), Reader, School of Engineering, Cardiff University, The Parade, Cardiff CF24 3AA, UK