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Geophysical Research Letters

Statistical mechanics of wind wave-induced erosion in shallow tidal basins: Inferences from the Venice Lagoon

Authors

  • Andrea D'Alpaos,

    Corresponding author
    1. Department of Geosciences, University of Padova, Padua, Italy
    • Corresponding author: A. D'Alpaos, Department of Geosciences, University of Padua, Padua, Italy. (andrea.dalpaos@unipd.it)

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  • Luca Carniello,

    1. Department of Civil, Environmental and Architectural Engineering (ICEA), University of Padova, Padua, Italy
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  • Andrea Rinaldo

    1. Department of Civil, Environmental and Architectural Engineering (ICEA), University of Padova, Padua, Italy
    2. Laboratory of Ecohydrology (ECHO), IEE, ENAC, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
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Abstract

[1] Wind wave-induced erosional effects are among the chief landscape-forming processes in tidal biomorphodynamics. Wave-driven bottom erosion, in fact, controls the equilibrium elevation and dynamics of subtidal and tidal flat surfaces, and the impact of waves against salt marsh margins influences their stability. The relevance of predictive studies projecting wind wave patterns in space and time is thus notable especially in view of the limited insight gained so far. Here we have employed a complete, coupled finite element model accounting for the role of wind waves and tidal currents on the hydrodynamic circulation in shallow basins to analyze the characteristics of combined current- and wave-induced exceedances in bottom shear stress over a given threshold for erosion. The results of our analyses from the Venice Lagoon suggest that wind wave-induced resuspension events can be modeled as a marked Poisson process, thus allowing one to set up a theoretical framework which can be used to model wind wave effects through the use of Monte Carlo realizations. This bears important consequences for quantitative analyses of the long-term biomorphodynamic evolution of tidal landscapes.

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