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Quantifying biologically and physically induced flow and tracer dynamics in permeable sediments

Meysman, F.J.R. and Galaktionov, O. and Cook, P. and Janssen, F. and Huettel, M. and Middelburg, J.J. (2007) Quantifying biologically and physically induced flow and tracer dynamics in permeable sediments. Biogeosciences, 4, 627-646. ISSN 1726-4170.

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Official URL: http://dx.doi.org/10.5194/bg-4-627-2007

Abstract

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.

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:4510
Deposited On:15 Sep 2009 02:00
Last Modified:15 Jan 2014 09:20

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