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The stability of tidal flats in Venice Lagoon: the results of in situ measurements using two benthic flumes (in special issue on Lagoon of Venice. Circulation, water exchange and ecosystem functioning)

The stability of tidal flats in Venice Lagoon: the results of in situ measurements using two benthic flumes (in special issue on Lagoon of Venice. Circulation, water exchange and ecosystem functioning)
The stability of tidal flats in Venice Lagoon: the results of in situ measurements using two benthic flumes (in special issue on Lagoon of Venice. Circulation, water exchange and ecosystem functioning)
Seabed properties in Venice Lagoon were examined in situ in two multidisciplinary field campaigns. The purpose of this study was to understand the mechanisms controlling the stability of bed types. Two benthic annular flumes (Sea Carousel and Mini Flume) were deployed simultaneously from a floating pontoon at 24 sites during summer (1998), which were considered representative of the range in bed/habitat types. As well, bottom sampling and coring, water-column monitoring and benthic habitat analyses were carried out. All but three sites were on cohesive sediments. Bed types included bare shelly mudflats and regions colonised by the seagrasses Cymodocea nodosa and Zostera noltii, by filamentous cyanobacteria, and by patches of the macrophytes Ulva rigida and Chaetomorpha sp. A subset (13) of these sites was visited during the subsequent winter to evaluate seasonal changes. Six of the sites were intertidal, the remainder were in the sublittoral zone.
Water temperature varied between 5 and 30 °C, and salinity varied between 20 and 38 psu. In the absence of waves, turbidity was generally low (<10 mg/l) and was composed of high amounts of organic matter (25–50%). This indicates that the tidal flows were not competent to support estuarine sediment. Higher levels of turbidity were measured during wind events or boat passage as a result of resuspension from the bed. Bed (saturated) density was, on average, 1770 kg/m3, which was extremely high for estuarine sediments.
Sea Carousel and Mini Flume provided comparable results, despite large differences in instrument footprints. Trends from the two instruments were similar and showed that summertime bed strength exceeded the winter by up to five times. Mean summer erosion thresholds for Sea Carousel and Mini Flume were 1.10 and 0.82 Pa, respectively, whereas during winter, they were 0.69 and 0.74 Pa. The northern lagoon had the most resistant tidal flats due to the stabilizing effect of filamentous cyanobacteria (Biostabilization Index: BI=244%), microphytobenthos (BI=153%) and Z. noltii (BI=206%). The stabilizing effects of C. nodosa (BI=74%), U. rigida (BI=115%) and shell debris (BI=115%) were intermediate, while bare sublittoral mud beds were the least resistant (BI=58%). Summer erosion rates (as a function of applied stress) were lower than winter ones, probably due to water temperature changes. The algorithm E=s, yielded good results and indicated that erosion rates in Venice Lagoon were high, notwithstanding the high erosion thresholds. The mean summertime friction coefficient was =62° and was highest in the central lagoon. The wintertime =69° showed that there was no seasonal fluctuation in bed stability. Mass settling in Venice Lagoon was a strong function of suspended sediment concentration (S) and a decay constant (k) of the exponential function S(t)=Soe?kt; it was found to be in continuity with examples from other locations worldwide (and therefore normal).
benthic currents, benthic environment, measuring devices, sedimentation, intertidal flats, microtidal lagoons
0924-7963
211-242
Amos, C.L.
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Bergamasco, A.
6ebc0af6-b9fd-44cc-a2f7-d3700c9bb9cf
Umgiesser, G.
715016aa-c166-4598-89fc-cf2af5a85c78
Cappucci, S.
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Cloutier, D.
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Flindt, M.
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Denat, L.
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Cristante, S.
ef3d2c89-2a01-4a68-ace6-d935e753c198
Amos, C.L.
d0a18a13-bccd-4fdc-8901-aea595d4ed5c
Bergamasco, A.
6ebc0af6-b9fd-44cc-a2f7-d3700c9bb9cf
Umgiesser, G.
715016aa-c166-4598-89fc-cf2af5a85c78
Cappucci, S.
d017f8cd-f6c2-404e-a2e4-09cc75c38ea1
Cloutier, D.
3ccba0f5-e8ea-4764-9a66-43c121d50191
Flindt, M.
da133ad3-381a-427d-ab33-8abca702813d
Denat, L.
e1326453-9f50-4170-9921-9867d50b29c4
Cristante, S.
ef3d2c89-2a01-4a68-ace6-d935e753c198

Amos, C.L., Bergamasco, A., Umgiesser, G., Cappucci, S., Cloutier, D., Flindt, M., Denat, L. and Cristante, S. (2004) The stability of tidal flats in Venice Lagoon: the results of in situ measurements using two benthic flumes (in special issue on Lagoon of Venice. Circulation, water exchange and ecosystem functioning). Journal of Marine Systems, 51 (1-4), 211-242. (doi:10.1016/j.jmarsys.2004.05.013).

Record type: Article

Abstract

Seabed properties in Venice Lagoon were examined in situ in two multidisciplinary field campaigns. The purpose of this study was to understand the mechanisms controlling the stability of bed types. Two benthic annular flumes (Sea Carousel and Mini Flume) were deployed simultaneously from a floating pontoon at 24 sites during summer (1998), which were considered representative of the range in bed/habitat types. As well, bottom sampling and coring, water-column monitoring and benthic habitat analyses were carried out. All but three sites were on cohesive sediments. Bed types included bare shelly mudflats and regions colonised by the seagrasses Cymodocea nodosa and Zostera noltii, by filamentous cyanobacteria, and by patches of the macrophytes Ulva rigida and Chaetomorpha sp. A subset (13) of these sites was visited during the subsequent winter to evaluate seasonal changes. Six of the sites were intertidal, the remainder were in the sublittoral zone.
Water temperature varied between 5 and 30 °C, and salinity varied between 20 and 38 psu. In the absence of waves, turbidity was generally low (<10 mg/l) and was composed of high amounts of organic matter (25–50%). This indicates that the tidal flows were not competent to support estuarine sediment. Higher levels of turbidity were measured during wind events or boat passage as a result of resuspension from the bed. Bed (saturated) density was, on average, 1770 kg/m3, which was extremely high for estuarine sediments.
Sea Carousel and Mini Flume provided comparable results, despite large differences in instrument footprints. Trends from the two instruments were similar and showed that summertime bed strength exceeded the winter by up to five times. Mean summer erosion thresholds for Sea Carousel and Mini Flume were 1.10 and 0.82 Pa, respectively, whereas during winter, they were 0.69 and 0.74 Pa. The northern lagoon had the most resistant tidal flats due to the stabilizing effect of filamentous cyanobacteria (Biostabilization Index: BI=244%), microphytobenthos (BI=153%) and Z. noltii (BI=206%). The stabilizing effects of C. nodosa (BI=74%), U. rigida (BI=115%) and shell debris (BI=115%) were intermediate, while bare sublittoral mud beds were the least resistant (BI=58%). Summer erosion rates (as a function of applied stress) were lower than winter ones, probably due to water temperature changes. The algorithm E=s, yielded good results and indicated that erosion rates in Venice Lagoon were high, notwithstanding the high erosion thresholds. The mean summertime friction coefficient was =62° and was highest in the central lagoon. The wintertime =69° showed that there was no seasonal fluctuation in bed stability. Mass settling in Venice Lagoon was a strong function of suspended sediment concentration (S) and a decay constant (k) of the exponential function S(t)=Soe?kt; it was found to be in continuity with examples from other locations worldwide (and therefore normal).

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More information

Published date: November 2004
Keywords: benthic currents, benthic environment, measuring devices, sedimentation, intertidal flats, microtidal lagoons

Identifiers

Local EPrints ID: 12583
URI: http://eprints.soton.ac.uk/id/eprint/12583
ISSN: 0924-7963
PURE UUID: 3f093004-0329-4798-baf2-40a63df88ebe

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Date deposited: 30 Nov 2004
Last modified: 15 Mar 2024 05:06

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Contributors

Author: C.L. Amos
Author: A. Bergamasco
Author: G. Umgiesser
Author: S. Cappucci
Author: D. Cloutier
Author: M. Flindt
Author: L. Denat
Author: S. Cristante

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