Thesis /

ROMDOC-THESIS-2016-375

Studiul evoluţiei interfeţei a două fluide imiscibile vâscoase cu aplicaţie la poluarea cu petrol produsă pe curgerile cu suprafaţă liberă

Popescu, Delia-Mihaela
2008-09-24

Abstract: EVOLUTION OF THE INTERFACE BETWEEN TWO VISCOUS IMISCIBLE FLUIDS WITH APPLICATION TO OIL POLLUTION ON OPEN CHANNEL FLOWS Abstract Water quality has become an increasingly serious problem, for which more and more solutions are requested. Starting from a case study, present thesis tries to answer some of these problems by proposing a numerical model capable of simulating the space-time evolution of an oil pollutant slick and plume on a river. This model is useful for decision factors to plan control and removal measures at the right time and place. Laboratory experimental research has been carried out under static and dynamic conditions to study some of the physico-chemical processes that appear during the transport and fate of an oil slick. These researches have shown that small scale phenomena are somehow different than real scale ones. This is why the numerical models that simulate oil slick and dispersed particles transport and fate should be calibrated on data acquired from real accidents. Based on simplifying assumptions adapted to a real case of accidental pollution happened on Prahova and IalomiŃa rivers, two such simulation models were developed. In order to calculate the travel time of the slick leading edge, HEC-RAS software was used to develop a 1D hydraulic model, which was calibrated on real case data. Starting from this hydraulic model, a relationship to estimate the slick travel time was derived for the Brătăsanca-łăndărei reach. This relationship may be used under similar discharge conditions for this reach as a prognosis tool to estimate the moment when the slick leading edge arrives in a certain cross-section. To simulate the transport of dispersed fractions a software (POLUARE) was developed under Pascal programming language. With the help of this software a 1D water quality module model was obtained for the studied reach. This mathematical model, which computes the evolution of pollutant concentration in time and space, was calibrated on in-situ measured data from a field tracer (rodamina) campaign that took place on the Cosereni – Manasiadownstream reach of Ialomita river. Concentration variation with time was measured in three cross-section profiles located at 4, 6 and 8 m downstream of tracer injection point. The obtained results from the numerical simulations show a good correlation with physico-chemical processes that appear on natural river channels. To validate the model POLUARE the water quality module of HEC-RAS software was used. The numerical simulations were performed under the same boundary conditions and with the same geometry and time step. Correlation coefficient values above 95% between the two models (POLUARE and HEC-RAS) indicate a good fit.

Keyword(s): Poluare industrială -- Poluarea apei de suprafaţă -- Petrol -- Teză de doctorat ; Cinetica fluidelor -- Mecanica fluidelor -- Teză de doctorat ; Tratarea apei -- Teză de doctorat
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