In situ characterization and dynamics of Suspended Particulate Matter (SPM) in the Rhine river front during neap tide

A 13 hour field campaign was carried out off the Dutch coast near the Sand Engine on September 17, 2014, on a neap tide, 10 km north of the river mouth [1, 2]. Samples were taken with a van Dorn water sampler every half hour at 0.6 m above bed (mab). These samples were analysed with a LabsFLOC-2 camera [3]. In addition an underwater camera took videos of flocs. LISST, OBS and water velocity data were also obtained. The flocs size and shape found from the two cameras is compared.