[1] Cranfield Univ, Cranfield Water Sci Inst, Cranfield MK43 OAL, Beds, England
[2] Simon Fraser Univ, Dept Earth Sci, Burnaby, BC V5A 1S6, Canada
[3] Univ Birmingham, Sch Geog Earth & Environm Sci, Birmingham B15 2TT, W Midlands, England
[4] Univ Rennes 1, CNRS, UMR 6118, F-35042 Rennes, France
[5] Univ Liege, B-4000 Liege 1, Belgium