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Effect of algae on flocculation of suspended bed sediments in a large shallow lake. Consequences for ecology and sediment transport processes

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Abstract

Lake Markermeer, a large shallow lake in The Netherlands, suffers from turbidity and ecology problems. As part of a study aiming to mitigate these problems, we study flocculation processes in the lake; in particular, the possible mutual flocculation between algae and re-suspended bed sediments. We show that sediment re-suspended from the bed of the lake can flocculate, forming flocs for which size is a function of the turbulence level in the water column. Moreover, we also demonstrate that algae and re-suspended bed sediments can mutually flocculate, yielding organic-inorganic aggregates. These aggregates have different features to those of their individual components, some of which have been measured and characterized in this paper. Furthermore, the characteristics of the resulting organic-inorganic flocs are strongly influenced by the type of algae in the aggregate. We found that, in the case of flocs consisting of bed sediments and filamentous algae, flocculation yields smaller flocs than for bed sediments only, resulting in an increased turbidity in the water column. In the case of flocs consisting of bed sediments and colonial algae, flocs grow faster and become larger than bed sediment flocs, which may result in the depletion of most colonies from the water column.

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Authors and Affiliations

  1. Environmental Fluid Mechanics, Delft University of Technology, 2628CN, Delft, The Netherlands

    Miguel Angel de Lucas Pardo & Johan Christian Winterwerp

  2. Marine and Coastal Management, Deltares, 2629HD, Delft, The Netherlands

    Miguel Angel de Lucas Pardo & Johan Christian Winterwerp

  3. Netherlands Institute of Ecology (NIOO), 3631 AC, Nieuwersluis, The Netherlands

    Dirk Sarpe

Authors
  1. Miguel Angel de Lucas Pardo
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  2. Dirk Sarpe
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  3. Johan Christian Winterwerp
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Correspondence to Miguel Angel de Lucas Pardo.

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Responsible Editor: Jeremy Spearman

This article is part of the Topical Collection on the 12th International Conference on Cohesive Sediment Transport in Gainesville, Florida, USA, 21-24 October 2013

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de Lucas Pardo, M.A., Sarpe, D. & Winterwerp, J.C. Effect of algae on flocculation of suspended bed sediments in a large shallow lake. Consequences for ecology and sediment transport processes. Ocean Dynamics 65, 889–903 (2015). https://doi.org/10.1007/s10236-015-0841-y

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  • DOI: https://doi.org/10.1007/s10236-015-0841-y

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