A model of fluff layer erosion and subsequent bed erosion in the presence of the bioturbator, <I>Hydrobia ulvae</I>
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ID: 297619
2003
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Abstract
Previous studies have shown that the gastropod Hydrobia ulvae destabilizes the top layers of ne-grained sediments.This process is mediated by the formation of a "biogenic" uff layer that includes tracks, faecal pellets and mucus.This uff layer has been shown to be easily resuspended before general bed erosion.In order to examine how uff layer and bed erosion interact, ume experiments were performed with uid sediments of varying water contents.Ten thousand snails were placed and allowed to crawl for 5 h on the sediment surface, and then the resuspended sediment mass was measured in response to step-wise shear stress increases.Two distinct erosion phases were observed: (1) initial resuspension of the uff layer and (2) the subsequent bed erosion.Both the bioturbation by snails and sediment water content interacted positively to increase erosion rates during the phase of uff layer erosion.The presence of a uff layer due to the snail's activities did not affect rates of subsequent bed erosion.A vertical model (1DV) was developed to simulate the succession in time of the two distinct erosion phases.Within this deterministic model, erosion rates of the uff layer depend on the quantity of sediment that is present in the uff layer.Previous behavioral observations of track formation mechanisms were integrated into model equations to account for the snail density and the water content dependence.The observed bed erosion was fairly well reproduced by considering the variation with depth of the sediment density as measured in the experiments.This model suggests a new approach for assessing the erosion of natural sediments under the in uence of H. ulvae population density, water content and tidal currents.
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openalex_W2157160813
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| Authors | Francis Orvain, Pierre Le Hir, Pierre‐Guy Sauriau |
| Journal | journal of marine research |
| Year | 2003 |
| DOI |
10.1357/002224003322981165
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| URL | |
| Keywords | Keywords not found |
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