Modeliranje izhlapevanja nafte po metodi Fingas

• Main Author: Šaponja, Maja
• Other Authors: Žagar, Dušan
• Format: Bachelor Thesis
• Language: Slovenian
• Published: M. Šaponja 2015
• Subjects: gradbeništvo; diplomska naloga; UNI; VKI; razlitje nafte; izhlapevanje; matematično modeliranje; metoda Mackay; metoda Fingas; graduation thesis; civil engineering; oil spill; evaporation; numerical modelling; Mackay's method; Fingas method; info:eu-repo/classification/udc/519.61/.64:551.461:665.61(043.2); Mackay; Prudhoe Bay
• Online Access: https://repozitorij.uni-lj.si/IzpisGradiva.php?id=32256; https://repozitorij.uni-lj.si/Dokument.php?id=32267&dn=; https://repozitorij.uni-lj.si/Dokument.php?id=85756&dn=; https://plus.si.cobiss.net/opac7/bib/6590817?lang=sl

Izhlapevanje je eden izmed najpomembnejših procesov, ki potekajo med in po razlitju nafte. Zato je ključnega pomena, da pri modeliranju razlitja nafte izhlapevanje upoštevamo. Za opis procesa izhlapevanja nafte se v modelih največkrat uporabljata Mackayeva in Fingasova metoda. Mackayeva metoda temelji na opazovanju izhlapevanja vode in pri tem upošteva mejno plast. Pri Fingasovi metodi izhlapevanje nafte ni regulirano z mejno plastjo. Na UL FGG je bil izdelan tridimenzionalni model NAFTA3d, ki temelji na Lagrangeovi metodi sledenja delcev. V okviru diplomske naloge smo model NAFTA3d nadgradili. Metodo Mackay smo v modelu NAFTA3d dopolnili tako, da za račun izhlapevanja namesto številnih vhodnih podatkov zadošča API-indeks.Model smo dopolnili z metodo Fingas, ki temelji na laboratorijskih poizkusih in empiričnih enačbah, ki so funkcija temperature in časa. Obe metodi smo med seboj primerjali na istih podatkih v simulacijah razlitja nafte v Tržaškem zalivu. Uporabili smo nafto vrste Brent Blend in nafto vrste Prudhoe Bay. Iz dobljenih rezultatov smo ugotovili, da metoda Mackay daje znatno višje vrednosti izhlapevanja, kar posledično vpliva tudi na ostale procese, ki se zgodijo ob razlitju. Evaporation is one of the most important processes during an oil spill and needs to be included into the oil spill models. The oil-spill models mostly employ either the Mackay or the Fingas method for description and simulations of evaporation. The Mackay method is a boundary-layer regulated method based on observations of water evaporation. The Fingas approach is not regulated with the boundary layer. NAFTA3d is a 3D Lagrangean numerical model for oil-spill simulations, developed at the UL FGG, The NAFTA3d model was upgraded by adjusting the Mackay method, which is now capable to calculate the evaporation solely from the API-index instead of using numerous input parameters. The model was upgraded by including the Fingas method, which is based on laboratory experiments. In this method the evaporation of oil is described by empirical equations, which are function of temperature and time. Both methods have been intercompared on the same set of input data. We simulated an oil spill in the Gulf of Trieste using two different types of oil: the Brent Blend crude and Prudhoe Bay crude. The simulation results showed significantly higher evaporation using the Mackay method, which affects the other process in the case of an oil spill.