Effects of small-scale turbulence at the air-water interface on microcystis surface scum formation.

摘要: Abstract Cyanobacterial surface scum (here defined as visible Cyanobacteria colonies accumulating at the lake surface) is a harmful phenomenon that negatively affects water quality, human and animal health. Colony-forming Microcystis one of most important ubiquitous genera can suddenly accumulate surfaces. Turbulent motion, e.g., generated by wind, vertically disperse this layer, which later re-establish upward migration colonies. However, role wind-generated turbulence in formation development still poorly understood. Here we present results from laboratory mesocosm study where analysed processes its response to low wind speed (≤3.6 m s−1). colony size flow velocity bulk were measured using microscope camera particle tracking velocimetry. The formed aggregation surface, they loose clusters increasing size. presence large aggregations or film determined stability layer. For largest applied speed, broken down sizes