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Bioirrigation in permeable sediments: Advective pore‐water transport induced by burrow ventilation
Author(s) -
Meysman Filip J. R.,
Galaktionov Oleksiy S.,
Gribsholt Britta,
Middelburg Jack J.
Publication year - 2006
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.2006.51.1.0142
Subject(s) - burrow , sediment , advection , arenicola , bioturbation , environmental science , soil science , geology , sediment–water interface , hydrology (agriculture) , chemistry , ecology , geomorphology , geotechnical engineering , physics , biology , paleontology , thermodynamics
The physical mechanism that drives bioirrigation is strongly dependent on the permeability of the sediment. We advance two mechanisms, each described by a corresponding microenvironment model. In muds, burrow water cannot penetrate the sediment, so bioirrigation is intrinsically driven by diffusional transfer across the burrow wall. This “diffusive” mode of bioirrigation is accurately described by the classical tube irrigation model. In sands, ventilation flows can penetrate the surrounding sediment via dead end burrows. To quantify this “advective” mode of bioirrigation, we propose a novel two‐dimensional pocket injection model. This model’ principal features are that (1) organisms indent the sediment‐water interface with burrow structures, (2) the specific structure of the burrow can be neglected except for the location of a feeding pocket, and (3) burrow water is injected from this feeding pocket into the surrounding sediment. We tested the adequacy of the pocket injection model in a detailed case study of the lugworm Arenicola marina , comparing model simulations and experimental data from core incubations. Simulation of two different sets of inert tracer experiments shows good agreement between model and data, indicating that our model captures the relevant aspects of lugworm bioirrigation in permeable sediments.