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• W2169014683 abstract "AB Aquatic Biology Contact the journal Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections AB 2:239-254 (2008) - DOI: https://doi.org/10.3354/ab00054 Theme Section: Bioturbation in aquatic environments: linking past and present Quantifying particle dispersal in aquatic sediments at short time scales: model selection Filip J. R. Meysman1,2,*, Volodymyr S. Malyuga1, Bernard P. Boudreau3, Jack J. Middelburg1 1The Netherlands Institute of Ecology (NIOO-KNAW), Centre for Estuarine and Marine Ecology, PO Box 140, 4400 AC Yerseke, The Netherlands 2Department of Analytical and Environmental Chemistry, Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050 Brussel, Belgium 3Department of Oceanography, Dalhousie University, Halifax, Nova Scotia B3H 4J1, Canada *Email: filip.meysman@vub.ac.be ABSTRACT: In a pulse-tracer experiment, a layer of tracer particles is added to the sediment–water interface, and the down-mixing of these particles is followed over a short time scale. Here, we compared different models (biodiffusion, telegraph, CTRW) to analyse the resulting tracer depth profiles. The biodiffusion model is widely applied, but entails 2 problems: (1) infinite propagation speed—the infinitely fast propagation of tracer to depth, and (2) infinitely short waiting times—mixing events follow each other infinitely fast. We show that the problem of waiting times is far more relevant to tracer studies than the problem of propagation speed. The key issue in pulse-tracer experiments is that models should explicitly account for a finite waiting time between mixing events. The telegraph equation has a finite propagation speed, but it still assumes infinitely short waiting times, and, hence, it does not form a suitable alternative to the biodiffusion model. Therefore, we advance the continuous-time random walk (CTRW), which explicitly accounts for finite waiting times between mixing events, as a suitable description of bioturbation. CTRW models are able to cope with lateral spatial heterogeneity in reworking, which is a crucial feature of bioturbation at short time scales. We show how existing bioturbation models (biodiffusion model, telegraph equation, non-local exchange model) can be considered as special cases of the CTRW model. Accordingly, the CTRW model is not a new bioturbation model, but a generalization of existing models. KEY WORDS: Bioturbation · Diffusion · Luminophores · Modelling · Continuous-time random walk Full text in pdf format PreviousNextCite this article as: Meysman FJR, Malyuga VS, Boudreau BP, Middelburg JJ (2008) Quantifying particle dispersal in aquatic sediments at short time scales: model selection. Aquat Biol 2:239-254. https://doi.org/10.3354/ab00054 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AB Vol. 2, No. 3. Online publication date: June 19, 2008 Print ISSN: 1864-7782; Online ISSN: 1864-7790 Copyright © 2008 Inter-Research." @default.
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• W2169014683 title "Quantifying particle dispersal in aquatic sediments at short time scales: model selection" @default.
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