| Title: | Lagrangian modelling of a person lost at sea during the Adriatic scirocco storm of 29 October 2018 |
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| Authors: | ID Ličer, Matjaž (Author)
ID Estival, Solène (Author)
ID Reyes-Suarez, Catalina (Author)
ID Deponte, Davide (Author)
ID Fettich, Anja (Author) |
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| Files: |  PDF - Presentation file, download (12,96 MB)
MD5: 0EA4CA8B303E94BF81303A1FE7799B72
 URL - Source URL, visit https://doi.org/10.5194/nhess-20-2335-2020
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  NIB - National Institute of Biology
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| Abstract: | 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. |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 26.08.2020 |
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| Year of publishing: | 2020 |
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| Number of pages: | str. 2335-2349 |
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| Numbering: | Vol. 20, iss. 8 |
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| PID: | 20.500.12556/DiRROS-19526  |
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| UDC: | 574 |
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| ISSN on article: | 1561-8633 |
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| DOI: | 10.5194/nhess-20-2335-2020 |
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| COBISS.SI-ID: | 27506435 |
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| Publication date in DiRROS: | 22.07.2024 |
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| Views: | 8 |
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| Downloads: | 4 |
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