20.500.12556/DiRROS-19526 Lagrangian modelling of a person lost at sea during the Adriatic scirocco storm of 29 October 2018 On 29 October 2018 a windsurfer's mast broke about 1 km offshore from Istria during a severe scirocco storm in the northern Adriatic Sea. He drifted in severe marine conditions until he eventually beached alive and well in Sistiana (Italy) 24 h later. We conducted an interview with the survivor to reconstruct his trajectory and to gain insight into his swimming and paddling strategy. Part of survivor's trajectory was verified using high-frequency radar surface current observations as inputs for Lagrangian temporal back-propagation from the beaching site. Back-propagation simulations were found to be largely consistent with the survivor's reconstruction. We then attempted a Lagrangian forward-propagation simulation of his trajectory by performing a leeway simulation using the OpenDrift tracking code using two object types: (i) person in water in unknown state and (ii) person with a surfboard. In both cases a high-resolution (1 km) setup of the NEMO v3.6 circulation model was employed for the surface current component, and a 4.4 km operational setup of the ALADIN atmospheric model was used for wind forcing. The best performance is obtained using the person-with-a-surfboard object type, giving the highest percentage of particles stranded within 5 km of the beaching site. Accumulation of particles stranded within 5 km of the beaching site saturates 6 h after the actual beaching time for all drifting-particle types. This time lag most likely occurs due to poor NEMO model representation of surface currents, especially in the final hours of the drift. A control run of wind-only forcing shows the poorest performance of all simulations. This indicates the importance of topographically constrained ocean currents in semi-enclosed basins even in seemingly wind-dominated situations for determining the trajectory of a person lost at sea. hidrobiologija morski tokovi naravne nesreče analize true false true Angleški jezik Slovenski jezik Neznano 2024-07-19 03:43:21 2024-07-22 11:08:11 2024-07-23 03:55:52 0000-00-00 00:00:00 2020 0 0 str. 2335-2349 iss. 8 Vol. 20 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2020-08-26 574 1561-8633 10.5194/nhess-20-2335-2020 27506435 RAZ_Licer_Matjaz_2020.pdf RAZ_Licer_Matjaz_2020.pdf 1 0EA4CA8B303E94BF81303A1FE7799B72 addb7b8da060108955578c0a4136b300a48149d33623b1628bca331c6971cd7b 5676b319-47f9-11ef-b487-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=27070 https://doi.org/10.5194/nhess-20-2335-2020 0 7868d044-47f9-11ef-b487-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=27071 Nacionalni inštitut za biologijo 0 0 0