Short-term variability of the size spectra of suspended particles in a rapidly changing environment |
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| Authors: | J-P Chanut SA Poulet |
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| Institution: | 1. Department d''Océanographie, Université du Québec, Rimouski, Québec, G5L 3A1, Canada;2. Laboratoire d''Océanologie, Institut National de la Recherche Scientifique, Rimouski, Québec, G5L 3A1, Canada |
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| Abstract: | Analysis of suspended matter collected in the lower St. Lawrence estuary indicated short-term variabilities in both the structure and dynamics of the particles. Variations with time and depth were ascribed to fluctuation of particle concentrations within the size ranges of the major peaks of concentration. A deterministic pattern was found for the temporal succession of the spectra when total particle concentrations were high. This was due to combinations of three factors that act in one of two ways, either (i) high current velocity—spring tide—stratified waters, or (ii) lower current velocity—neap tide—mixed waters. In the first case, the current effect prevailed, while the tide effect was dominant in the second one. A random pattern occurred in the succession of the spectra when lower particle concentrations and patches of smaller dimensions were present in well mixed water bodies. Successions of spectra were not always in phase at different depths within the water column. |
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| Keywords: | variation particle size distribution suspended matter Saint Lawrence estuary |
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