Journal
ESTUARINE COASTAL AND SHELF SCIENCE
Volume 96, Issue -, Pages 151-158Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ecss.2011.10.028
Keywords
aggregation dynamics; Bach Dang estuary; transparent exopolymer particles; salinity; vertical export; Vietnam
Categories
Funding
- French program EC2CO
- French Research Institute for Development (IRD), CNRS [GDR 2476]
- Vietnam Academy of Sciences and Technology (VAST)
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Variations of the sticking properties of transparent exopolymeric particles (TEP) were investigated by studying the interactions between latex beads and TEP precursors collected along a salinity gradient in the Bach Dang estuary, North Vietnam. For each sampling station, a suspension of TEP and beads was prepared and the formation of mixed aggregates was monitored in the laboratory under controlled turbulence intensity. The number of beads attached to TEP per volume of TEP increased from 0.22 x 10(-3) +/- 0.15 x 10(-3) mu m(-3) to 5.33 x 10(-3) +/- 1.61 x 10(-3) mu m(-3), from low (<1) to high (>28) salinities, respectively. The sudden increase in TEP sticking properties from salinity 10 to 15 suggests the occurrence of an aggregation web resulting from the stimulation of aggregation processes. For a given turbulence level, the formation of large aggregates should be enhanced seaward. The presence of a higher fraction of large aggregates seaward is supported by the increase of the slope of the particle size spectra measured in situ. The observed increase in TEP sticking properties toward high salinities may affect the vertical export pump in estuaries. This study suggests that the transition from a low to a high physico-chemical reactivity of TEP along estuaries may result in a succession from recycling for salinity <10 to enhanced aggregation/sedimentation processes and export dominated systems for salinity >10. (C) 2011 Elsevier Ltd. All rights reserved.
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