Abstract
Oil spill accident may happen during oil loading/unloading or ship collision in the river. The prediction of oil spill spread is essential for environmental assessment and management. The study aimed to predict the spread distance of oil spilled in the river with tidal effect. The physical experiments with the scale of 1:700 were conducted to confirm the accuracy of empirical formula of oil spread in the calm sea suggested by Fay. The mathe matical model for oil spill prediction is developed where the river flow conditions are computed by finite element model based on the Saint-Venant equations and the oil spill movement is represented by one-dimensional Fay formula. The experimental results showed that Fay's empirical formula can adequately represent oil slick movement even in moving water. The oil spread lengths in Chao Phraya River were then simulated by the developed model with various conditions in the year. From the study, the affected lengths of oil spill is in the range of 6–11 km and the convection transport is the main force to spread the oil slick. The study also showed the application of Finite Element Model in river environmental problem and in the environmental management.
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