The choice of droplet size probability distribution function for oil spill modeling is not trivial

Type Article
Date 2021-02
Language English
Author(s) Faillettaz Robin1, 2, Paris Claire B.1, Vaz Ana C.1, Perlin Natalie1, Aman Zachary M.3, Schlüter Michael4, Murawski Steven A.5
Affiliation(s) 1 : University of Miami, Rosenstiel School of Marine and Atmospheric Science, FL 33149, Miami, USA
2 : Ifremer, STH, F-56100 Lorient, France
3 : Centre for Energy, School of Mechanical and Chemical Engineering, The University of Western Australia, Crawley 6009, WA, Australia
4 : Institute of Multiphase Flows, Hamburg University of Technology, Eißendorfer Straße 38, 21073 Hamburg, Germany
5 : University of South Florida, College of Marine Science, 140 7th Ave. S., St. Petersburg, FL 33701, USA
Source Marine Pollution Bulletin (0025326X) (Elsevier BV), 2021-02 , Vol. 163 , P. 111920 (6p.)
DOI 10.1016/j.marpolbul.2020.111920
Keyword(s) Droplet size distribution, DSD, Oil spill, Oil spill model, Oil model, Deepwater Horizon, Blowout, d50, Probability distribution function

The droplet size distribution (DSD) formed by gas-saturated oil jets is one of the most important characteristics of the flow to understand and model the fate of uncontrolled deep-sea oil spills. The shape of the DSD, generally modeled as a theoretical lognormal, Rosin-Rammler or non-fundamental distribution function, defines the size and the mass volume range of the droplets. Yet, the fundamental DSD shape has received much less attention than the volume median size (d50) and range of the DSD during ten years of research following the Deepwater Horizon (DWH) blowout. To better understand the importance of the distribution function of the droplet size we compare the oil rising time, surface oil mass, and sedimented and beached masses for different DSDs derived from the DWH literature in idealized and applied conditions, while keeping d50 constant. We highlight substantial differences, showing that the probability distribution function of the DSD for far-field modeling is, regardless of the d50, consequential for oil spill response.

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