Journal
OCEAN DYNAMICS
Volume 61, Issue 10, Pages 1669-1680Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10236-011-0439-y
Keywords
Risk modelling; Lagrangian transport; Statistics of currents; Baltic Sea; Pollution transport; Ship routing
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Funding
- European Community [FP/2007-2013, 217246]
- Marie Curie Reintegration Grant ESTSpline [PERG02-GA-2007-224819]
- Estonian Ministry of Education and Science [SF0140077s08, F0140007s14]
- Estonian Science Foundation [7413]
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We address possibilities of minimising environmental risks using statistical features of current-driven propagation of adverse impacts to the coast. The recently introduced method for finding the optimum locations of potentially dangerous activities (Soomere et al. in Proc Estonian Acad Sci 59:156-165, 2010) is expanded towards accounting for the spatial distributions of probabilities and times for reaching the coast for passively advecting particles released in different sea areas. These distributions are calculated using large sets of Lagrangian trajectories found from Eulerian velocity fields provided by the Rossby Centre Ocean Model with a horizontal resolution of 2 nautical miles for 1987-1991. The test area is the Gulf of Finland in the northeastern Baltic Sea. The potential gain using the optimum fairways from the Baltic Proper to the eastern part of the gulf is an up to 44% decrease in the probability of coastal pollution and a similar increase in the average time for reaching the coast. The optimum fairways are mostly located to the north of the gulf axis (by 2-8 km on average) and meander substantially in some sections. The robustness of this approach is quantified as the typical root mean square deviation (6-16 km) between the optimum fairways specified from different criteria. Drastic variations in the width of the 'corridors' for almost optimal fairways (2-30 km for the average width of 15 km) signifies that the sensitivity of the results with respect to small changes in the environmental criteria largely varies in different parts of the gulf.
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