Generation of large pollution patches via collisions of sticky floating parcels driven by wind and surface currents.

Abstract:

:We study the evolution of large systems of sticky patches of pollution that float on the sea surface and are moved around by realistic wind and simulated surface currents. The study area is the Gulf of Finland in the eastern Baltic Sea that hosts extremely heavy cargo and tanker traffic. It is assumed that patches merge at collision. Collisions are enhanced by wind impact that depends on the patch size. We implement a space partitioning algorithm for fast simulations of large systems of >8000 patches and perform a series of simulations with different initial size and location of the patches. The resulting empirical distribution of the number of patches of different size is governed universally by a stretched-exponential power law f(x) = A exp (-xb). This indicates that the evolution of large systems of pollution patches on the sea surface exhibits classic self-organization and scale invariance properties. This may be the key effect explaining how the patchiness of waste in marine environment is formed under the impact of different drivers.

journal_name

Mar Pollut Bull

authors

Giudici A,Kalda J,Soomere T

doi

10.1016/j.marpolbul.2019.02.039

subject

Has Abstract

pub_date

2019-04-01 00:00:00

pages

573-585

eissn

0025-326X

issn

1879-3363

pii

S0025-326X(19)30138-9

journal_volume

141

pub_type

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