Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Jonni Lehtiranta"'
Publikováno v:
Journal of Marine Science and Engineering, Vol 8, Iss 10, p 759 (2020)
Maneuvers in level ice are common operations for icebreakers and polar supply vessels. Maneuvering exposes the midship and stern area to ice interaction, influencing the magnitude and frequency of ice-induced loading in these areas. However, full-sca
Externí odkaz:
https://doaj.org/article/a6da2415fac446e5aa85967fca270ab9
Autor:
Jonni Lehtiranta, Tuomas Kärnä
The fate of plastic litter in seasonally ice-covered waters is an area of active research. The ice will transport any litter affixed to it, and the drift of sea ice differs substantially from the flow of surface currents, especially in marginal seas.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b27690a80e92ac6fb85cb64a46857c48
https://doi.org/10.5194/egusphere-egu22-11852
https://doi.org/10.5194/egusphere-egu22-11852
Autor:
Jonni Lehtiranta
Current operational sea ice models solve primitive equations on a grid and treat sea ice as a continuum with smoothly varying properties. This is the same method that is used in ocean models. The continuum assumption is unrealistic for sea ice which
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::87e30d24e8b20256db70d4986474eaa7
https://doi.org/10.5194/egusphere-egu2020-18117
https://doi.org/10.5194/egusphere-egu2020-18117
We are developing a new operational circulation model for the Baltic Sea using NEMO v4.0. The model configuration is derived from the NEMO v3.6 1 nmi NemoNordic setup (Hordoir et al., Geoscientific Model Development, 2019). A pre-operational version
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::da9d733d9be38462c5f24c125aabc384
https://doi.org/10.5194/egusphere-egu2020-16587
https://doi.org/10.5194/egusphere-egu2020-16587
Publikováno v:
The Cryosphere, Vol 12, Pp 3459-3476 (2018)
EPIC3The Cryosphere, 12, pp. 3459-3476
EPIC3The Cryosphere, 12, pp. 3459-3476
While variations of Baltic Sea ice extent and thickness have been extensively studied, there is little information about drift ice thickness, distribution, and its variability. In our study, we quantify the interannual variability of sea ice thicknes
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::07a5b16cd2cba762c74977c60cd4e076
https://www.the-cryosphere.net/12/3459/2018/tc-12-3459-2018.pdf
https://www.the-cryosphere.net/12/3459/2018/tc-12-3459-2018.pdf
Publikováno v:
COLD REGIONS SCIENCE AND TECHNOLOGY. 151:94-108
For the design and transit simulation of ice-going ships, a number of methods have been proposed for the prediction of ship resistance and transit speed in various ice conditions. In this paper, selected methods for ship performance in level ice, rid
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a29203e606c31855ef5ecba0ec6d91e6
https://doi.org/10.1016/j.coldregions.2018.03.008
https://doi.org/10.1016/j.coldregions.2018.03.008
Publikováno v:
Cold Regions Science and Technology. 168:102871
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5f6ca49c450e4c6d76527413a4fa52d6
https://doi.org/10.1016/j.coldregions.2019.102871
https://doi.org/10.1016/j.coldregions.2019.102871
Publikováno v:
All Days.
Compressive ice is considered to be amongst the worst operating conditions when navigating in ice and demanding for icebreaker assistance. Compression is a manifestation of ice cover stresses and a phenomenon physically different from convergence. In
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fa1dd00fd531ed795593a061db4666a1
https://doi.org/10.4043/25595-ms
https://doi.org/10.4043/25595-ms
Publikováno v:
The Cryosphere, Vol 9, Iss 1, Pp 357-366 (2015)
Pairs of consecutive C-band synthetic-aperture radar (SAR) images are routinely used for sea ice motion estimation. The L-band radar has a fundamentally different character, as its longer wavelength penetrates deeper into sea ice. L-band SAR provides
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e35333da27fc9bf58e40de9b1fc884b3
https://doi.org/10.5194/tcd-8-2721-2014
https://doi.org/10.5194/tcd-8-2721-2014
Autor:
Hanna Leisti, Kristjan Kaups, Jonni Lehtiranta, Mikael Lindfors, Mikko Suominen, Mikko Lensu, Jari Haapala, Kaj Riska, Tarmo Kouts
Publikováno v:
Scopus-Elsevier
Aalto University
Aalto University
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::2ffe2c8bbc5a982cc194e6046c5ca09e
http://www.scopus.com/inward/record.url?eid=2-s2.0-84903178703&partnerID=MN8TOARS
http://www.scopus.com/inward/record.url?eid=2-s2.0-84903178703&partnerID=MN8TOARS