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Attributing mean circulation patterns to physical phenomena in the Gulf of Finland

100%

Westerlund A., Tuomi L., Alenius P., Miettunen E., Vankevich R. E.

Oceanologia

2018

tom 60

nr 1

We studied circulation patterns in the Gulf of Finland, an estuary-like sub-basin of the Baltic Sea. According to previous observations and model results, the long-term mean circulation in the gulf is cyclonic and mainly density driven, whereas short-term circulation patterns are wind driven. We used the high-resolution 3D hydrodynamic model NEMO to simulate the years 2012–2014. Our aim was to investigate the role of some key features, like river runoff and occasional events, in the formation of the circulation patterns. Our results show that many of the differences visible in the annual mean circulation patterns from one year to another are caused by a relatively small number of high current speed events. These events seem to be upwelling-related coastal jets. Although the Gulf of Finland receives large amounts of fresh water in river runoffs, the inter-annual variations in runoff did not explain the variations in the mean circulation patterns.

Lead in game bird meat as a risk to public health: new aspects in the light of physical phenomena generated by a projectile

84%

Felsmann M. Z., Szarek J., Felsmann M., Gulda D.

Journal of Elementology

2016

tom 21

nr 2

Annually, hunters shoot millions of birds with lead ammunition. Many studies indicate diverse and often very high lead levels in the edible parts of game. Considering the number of hunters, the determined levels may pose a public health risk. Shotgun pellets are the main source of lead contamination of game animal tissues. Despite numerous studies indicating lead contamination in game birds, no significant reasons for diverse contamination of tissues with this toxic metal have been reported. The personal analysis presented in this paper suggests that the explanation for diverse levels of contamination of game animal tissues should be sought in physical phenomena generated by a projectile in damaged animal tissues. The projectile penetrating a target generates a multi-phase medium from destroyed tissues and simultaneously changes the shape of its front part. This movement of projectile is an example of a turbulent flow. The interpretation of the interaction between a projectile and damaged tissues indicate that the variable and unpredictable parameters of a projectile for each shot and the medium created by a projectile make it, impossible to determine, the degree of this interaction. The phenomenon of a temporary cavity created by a shot seems to determine the magnitude of lead transfer into tissues surrounding the path of a wound. Fluid mechanics also explains the relatively high lead levels in game birds in comparison with the levels determined in big game animals. In view of the unpredictability of projectile-animal body interactions, it should be assumed that game bird shot with lead pellets contains the lead levels dangerous to human health. Therefore, the use of lead pellets for bird shooting should be banned.

Modelowanie zjawisk fizycznych w osrodkach trojfazowych metodami deterministycznymi, statystycznymi i probabilistycznymi

67%

Pukos A.

Acta Agrophysica

1999

tom 22

157-162

W pracy przedstawiono trzy sposoby formułowania modeli fizycznych: deterministyczny, statystyczny i probabilistyczny. Pokazano na przykładzie modeli odkształceń gleb, że już w momencie formułowania definicji naprężenia i odkształcenia podejmuje się decyzję wyboru aparatu matematycznego.

Ograniczanie wyników

1 Acta Agrophysica

1 Journal of Elementology

1 Oceanologia

1 Alenius P.

1 Felsmann M.

1 Felsmann M. Z.

1 Gulda D.

1 Miettunen E.

1 Pukos A.

1 Szarek J.

1 Tuomi L.

1 Vankevich R. E.

1 Westerlund A.

1 2018

1 2016

1 1999

Wyniki wyszukiwania

Attributing mean circulation patterns to physical phenomena in the Gulf of Finland

Lead in game bird meat as a risk to public health: new aspects in the light of physical phenomena generated by a projectile

Modelowanie zjawisk fizycznych w osrodkach trojfazowych metodami deterministycznymi, statystycznymi i probabilistycznymi