Oil spill surface fate model through random walk method with drifted particles in voronoi diagram

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2021-1-11

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Erdoğan, Metehan

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Oil spilling isahazardous case to the marine environment by increasingthe risk of the destruction continually by flowing on the sea, expanding into sea and mixing into the air. Its potential threats can be prevented after the determination of its pathway. So, knowing the extent of oil contaminated sea as accurately as possible helps to decide the clean-up techniques like using skimmer, boom or dispersants and efficiently perform one of them. A well-defined models with the true reflection of the mechanisms behind the oil fate and transport can supply the oil extentto a great degree. Our main motivation in the study is to approach the oil surface processes with care and to numerically obtain the result from their equations in a good precision for instantaneously and constinuously spilled oils. So, a numerical solutionfor oil spreadingis provided by an algorithm already written and updated in thisstudy. It is compared for many scenarios with an analytical solution, an experiment and another numerical solution applying finite element method. The numerical approach in the algorithm uses Nihoul's equation with the Gaussian random walk technique stepping the particles with a diffusive length for the spreading treated like diffusion. The oil surface contamination is demonstrated by Voronoi diagram. Also, the particles are drifted with a velocity of 3% wind speed for the advection in the algorithm. The flexibility of the algorithm are checked through the slick parameters in this study. Besides, detailed analyzes on the slick shape, oil distribution on the surface and the contribution of the spreading regimes are carried out through the algorithm tried onthe prescribed cases. Finally, the algorithm is evaluated with a software embodying the solution to the main oil spreading processes and proposing the clean-up techniques. This study will be evolved by the addition of dispersion, evaporation and other processes expanding the algorithm to three dimensional model in the future.

Subject Keywords

Oil Spreading, Advection, Numerical Modeling, Voronoi Diagram, Random Walk Method

URI

https://hdl.handle.net/11511/89767

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

M. Erdoğan, “Oil spill surface fate model through random walk method with drifted particles in voronoi diagram,” M.S. - Master of Science, Middle East Technical University, 2021.