1. NIOZ Royal Netherlands Institute for Sea Research; Department of Estuarine and Delta Systems; Utrecht University; P.O. Box 140 Yerseke 4400 AC The Netherlands
2. Groningen Institute for Evolutionary Life Sciences; University of Groningen; PO Box 11103 Groningen 9700 CC The Netherlands
3. Faculty of Geo-Information Science and Earth Observation (ITC); University of Twente; P.O. Box 217 Enschede 7500 AE The Netherlands
4. School of Geography; Queen Mary University of London; London UK
5. UMR 5023 LEHNA; CNRS; Université Lyon 1; ENTPE; Villeurbanne France