The settling/rising velocity is of key importance in the vertical distribution of microplastics in marine environment. It is generally parameterized with semi-empirical laws dependent on the density difference between particles and fluid, size and shape of the particle. However, these physicochemical properties are extremely variable, given the complex multitude of microplastics in the sea. Therefore, it is difficult to know the settling/rising velocity for all the particles in the sea. A multivariate probability distribution for the vertical settling/rising velocity of marine microplastics was thus derived. A discrete probability distribution and a discrete mass-weighted probability distribution of the settling/rising velocity was obtained. The results suggest that most microplastics, given the predominant contribution of sedimentation, may accumulate on the seabed or reside for long periods in the water column, confirming the hypotheses reported in literature. The velocity probability distribution is of essential use as an input in stochastic dispersion models to properly simulate the phenomenon and understand its influence and effects.

Discrete multivariate probability distributions of microplastic settling/rising velocity in the marine environment / Bello, P.; Pini, A.; Zazzini, S.; Monti, P.; Leuzzi, G.. - (2022), pp. 358-362. (Intervento presentato al convegno 2022 IEEE International Workshop on Metrology for the Sea; Learning to Measure Sea Health Parameters, MetroSea 2022 tenutosi a Milazzo Castle, Italia) [10.1109/MetroSea55331.2022.9950981].

Discrete multivariate probability distributions of microplastic settling/rising velocity in the marine environment

Bello P.;Pini A.;Zazzini S.;Monti P.;Leuzzi G.
2022

Abstract

The settling/rising velocity is of key importance in the vertical distribution of microplastics in marine environment. It is generally parameterized with semi-empirical laws dependent on the density difference between particles and fluid, size and shape of the particle. However, these physicochemical properties are extremely variable, given the complex multitude of microplastics in the sea. Therefore, it is difficult to know the settling/rising velocity for all the particles in the sea. A multivariate probability distribution for the vertical settling/rising velocity of marine microplastics was thus derived. A discrete probability distribution and a discrete mass-weighted probability distribution of the settling/rising velocity was obtained. The results suggest that most microplastics, given the predominant contribution of sedimentation, may accumulate on the seabed or reside for long periods in the water column, confirming the hypotheses reported in literature. The velocity probability distribution is of essential use as an input in stochastic dispersion models to properly simulate the phenomenon and understand its influence and effects.
2022
2022 IEEE International Workshop on Metrology for the Sea; Learning to Measure Sea Health Parameters, MetroSea 2022
marine environment; microplastic; rising; settling; velocity probability distribution
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
Discrete multivariate probability distributions of microplastic settling/rising velocity in the marine environment / Bello, P.; Pini, A.; Zazzini, S.; Monti, P.; Leuzzi, G.. - (2022), pp. 358-362. (Intervento presentato al convegno 2022 IEEE International Workshop on Metrology for the Sea; Learning to Measure Sea Health Parameters, MetroSea 2022 tenutosi a Milazzo Castle, Italia) [10.1109/MetroSea55331.2022.9950981].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1664381
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