Preprints
https://doi.org/10.5194/nhess-2021-186
https://doi.org/10.5194/nhess-2021-186

  24 Jun 2021

24 Jun 2021

Review status: a revised version of this preprint was accepted for the journal NHESS.

Exploring the partial use of the Mo.S.E. system as effective adaptation to rising flood frequency of Venice

Riccardo Alvise Mel Riccardo Alvise Mel
  • Department of Environmental Engineering, University of Calabria, Rende (CS), 87036, Italy

Abstract. In times of climate change the impact of coastal hazards should be mitigated by identifying and implementing effective adaptation strategies, encompassing a balanced mix of structural and non-structural measures based on high level scientific knowledge. Due to its hydro-geological features, the Venice lagoon (Italy) is particularly vulnerable to climate change. Some structural measures have been adopted over time to protect Venice from flooding, among which a system of flap gates (Mo.S.E. system) has been operational under testing phase since October 2020. However, relative sea level rise and wind setup pose relevant management challenges, as a frequent closing of the lagoon would have negative impacts on flushing capacity, fishing industry and port activities. Hence, optimal operation rules for the existing control structure are searched to anticipate and to adapt to a possible acceleration of sea level rise induced by climate change. Here, the focus is on the hydrodynamic effects of a partial closure of the Mo.S.E. barriers that, with respect to closing all the three inlets of the Lagoon, could play a role in reducing the economic and environmental impacts of the Mo.S.E. system. The main goal is to identify the flooding events that can be counteracted by closing only the Lido inlet, which is the closest to the city of Venice. Based on the tidal and meteorological dataset collected in the period 2000–2019, a robust modelling exercise indicates that the closing of the Lido inlet only would protect the Venice lagoon from two third of the flooding events up to a relative sea level rise of +0.4 m.

Riccardo Alvise Mel

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on nhess-2021-186', Anonymous Referee #1, 16 Jul 2021
    • AC1: 'Reply on RC1', Riccardo Mel, 13 Aug 2021
  • RC2: 'Comment on nhess-2021-186', Anonymous Referee #2, 18 Jul 2021
    • AC2: 'Reply on RC2', Riccardo Mel, 13 Aug 2021

Riccardo Alvise Mel

Riccardo Alvise Mel

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Short summary
The present study investigates the hydrodynamics of the Venice lagoon if a partial use of the Mo.S.E. system (i.e., by closing the Lido inlet only) will be adopted. A linear relationship was obtained between the tidal range of the seaward tide signal and the reduction of the sea level peak at Venice, Burano and Chioggia. Tidal period and wind have been accounted for. Two third of the flood events can be effectively faced by such operation under relative sea level rise scenarios up to +0.4 m.
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