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| Titel |
Quantifying biologically and physically induced flow and tracer dynamics in permeable sediments |
| VerfasserIn |
F. J. R. Meysman, O. S. Galaktionov, P. L. M. Cook, F. Janssen, M. Huettel, J. J. Middelburg |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 4, no. 4 ; Nr. 4, no. 4 (2007-08-09), S.627-646 |
| Datensatznummer |
250001858
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| Publikation (Nr.) |
 copernicus.org/bg-4-627-2007.pdf |
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| Zusammenfassung |
| Insight in the biogeochemistry and ecology of sandy sediments
crucially depends on a quantitative description of pore water flow
and the associated transport of various solutes and particles. We
show that widely different problems can be modelled by the same flow
and tracer equations. The principal difference between model
applications concerns the geometry of the sediment-water interface
and the pressure conditions that are specified along this boundary.
We illustrate this commonality with four different case studies.
These include biologically and physically induced pore water flows,
as well as simplified laboratory set-ups versus more complex
field-like conditions: [1] lugworm bio-irrigation in laboratory
set-up, [2] interaction of bio-irrigation and groundwater seepage on
a tidal flat, [3] pore water flow induced by rotational stirring in
benthic chambers, and [4] pore water flow induced by unidirectional
flow over a ripple sequence. The same two example simulations are
performed in all four cases: (a) the time-dependent spreading of an
inert tracer in the pore water, and (b) the computation of the
steady-state distribution of oxygen in the sediment. Overall, our
model comparison indicates that model development for sandy
sediments is promising, but within an early stage. Clear challenges
remain in terms of model development, model validation, and model
implementation. |
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