Multimodality of a particle size distribution of cohesive suspended particulate matters in a coastal zone
Lee, B.J.; Fettweis, M.; Toorman, E.; Molz, F.J. (2012). Multimodality of a particle size distribution of cohesive suspended particulate matters in a coastal zone. J. Geophys. Res. 117(C3): 17. http://dx.doi.org/10.1029/2011JC007552 In: Journal of Geophysical Research. American Geophysical Union: Richmond. ISSN 0148-0227; e-ISSN 2156-2202, more |  |
| Keyword | | | Author keywords | flocculus; macrofloc; microfloc; multimodality; particle size distribution; primary particle |
| Abstract | [1] Particle size distributions (PSDs) of suspended particulate matters in a coastal zone are lognormal and multimodal in general. The multimodal PSD, which is caused by the mixing of multiple particle and aggregate size groups under flocculation and erosion/resuspension, is a record of the particle and aggregate dynamics in a coastal zone. Curve-fitting software was used to decompose the multimodal PSD into subordinate lognormal PSDs of primary particles, flocculi, microflocs, and macroflocs. The curve-fitting analysis for a time series of multimodal PSDs in the Belgian coastal zone showed the dependency of the multimodality on (1) shear-dependent flocculation in a flood and ebb tide, (2) breakage-resistant flocculation in the spring season, and (3) silt-sized particle erosion and advection in a storm surge. Also, for modeling and simulation purposes, the curve-fitting analysis and the settling flux estimation for the multimodal PSDs showed the possibility of using discrete groups of primary particles, flocculi, microflocs, and macroflocs as an approximation of a continuous multimodal PSD. |
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