@article{ref1,
title="Storm surge and seiche modelling in the Adriatic Sea and the impact of data assimilation",
journal="Quarterly journal of the Royal Meteorological Society",
year="2019",
author="Bajo, Marco and Međugorac, Iva and Umgiesser, Georg and Orlić, Mirko",
volume="145",
number="722",
pages="2070-2084",
abstract="In this research we present a modelling study of storm surges influenced by pre-existing seiches in the Adriatic Sea. The natural oscillation modes - seiches - of the Adriatic Sea can be easily excited by wind, due to the particular marine bathymetry and coastal orography. Moreover, such oscillations can interact with newer wind-induced storm surges or with other sea-level components. This paper first considers modelling issues in the seiche reproduction, using a simplified approach, and then analyses the reproduction with the model of two extreme storm surge events, influenced by pre-existing seiches. In order to investigate the impact of assimilating sea level data, these events are simulated without and with a data assimilation system, based on an Ensemble Kalman Filter. <br><br>RESULTS show that, while the formulation of the bottom shear stress does not influence the seiche period, the seiche decay time is correctly estimated with a hybrid linear-quadratic formulation. We found also that non-linear interactions of bottom currents, caused by different sea level components, can modify the decay time. However, the two events are poorly reproduced by the model, even with a correct modelling set-up, because of wind deficiencies. Therefore we considered the issue and found that the assimilation of tide-gauge residual sea level has a strong positive impact, lasting several days, despite the errors in the atmospheric forcing. This is mainly due to the persistence of the seiche oscillations in the Adriatic Sea.<p /> <p>Language: en</p>",
language="en",
issn="0035-9009",
doi="10.1002/qj.3544",
url="http://dx.doi.org/10.1002/qj.3544"
}