Hydrodynamics at a microtidal inlet: Analysis of propagation of the main wave components
| Autor: | Giovanna Darvini, Matteo Postacchini, Maurizio Brocchini, Joseph Calantoni, Gianluca Zitti, Alex Sheremet, Lorenzo Melito, Pierluigi Penna |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
010504 meteorology & atmospheric sciences Storms Infragravity wave Storm surge Aquatic Science Oceanography Atmospheric sciences Wave-current interaction 01 natural sciences Calm-storm transition 0105 earth and related environmental sciences geography geography.geographical_feature_category River mouth Infragravity waves 010604 marine biology & hydrobiology Estuary Breaking wave Storm Inlet Swell Wavelength Wave setup Geology Microtidal estuary |
| Zdroj: | Estuarine, coastal and shelf science 235 (2020). doi:10.1016/j.ecss.2020.106603 info:cnr-pdr/source/autori:Melito, Lorenzo; Postacchini, Matteo; Sheremet, Alex; Calantoni, Joseph; Zitti, Gianluca; Darvini, Giovanna; Penna, Pierluigi; Brocchini, Maurizio/titolo:Hydrodynamics at a microtidal inlet: Analysis of propagation of the main wave components/doi:10.1016%2Fj.ecss.2020.106603/rivista:Estuarine, coastal and shelf science (Print)/anno:2020/pagina_da:/pagina_a:/intervallo_pagine:/volume:235 |
| DOI: | 10.1016/j.ecss.2020.106603 |
| Popis: | The evolution of different wave components as they propagate within a microtidal inlet during a storm occurring from 24–26 January 2014 is analysed, in order to improve knowledge on how microtidal river mouths typical of the Adriatic Sea behave. For the first time, the “low-pass filter” mechanism previously ascertained at several macrotidal oceanic inlets around the world has been observed in the field with remarkably specific hydrodynamic conditions, i.e. low tide excursion, permanent connection with the sea and generally milder wave climate than in the ocean. Sea/swell (SS) waves were strongly dissipated before entering the river mouth, through the combined action of wave breaking due to reducing depths and opposing river currents enhanced by rainfall. Infragravity (IG) waves propagated upstream and significant IG wave heights of up to 0.4 m, about 13% of the local water depth, have been observed 400 m upriver (about 10 times the local SS peak wavelength) during storm climax. The IG wave energy here represented over 4% of the maximum offshore storm energy. IG wave components travelled upriver at estimated velocities between 3.6 m/s and 5.5 m/s (comparable with speeds of nonlinear long waves) during intense storm stages up to 600 m into the river channel (about 15 times the local SS peak wavelength), and are enhanced by tide-induced increase in water depths. It is estimated that tide-induced excursion accounted for about 80% of the total mean water elevation at storm peak at about 400 m into the river. Finally, tidal oscillations are detected up to 1.5 km upstream (about 40 times the local SS peak wavelength). This study highlights the dominance of astronomical tide over both wave setup and storm surge in controlling the upriver propagation of IG waves, even in a microtidal environment. |
| Databáze: | OpenAIRE |
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