Mathematical simulation on the oil slick spreading and dispersion in nonuniform flow fields

Abstract

ABSTRACT:The viscous fluid boundary layer equations were adopted to characterize the velocity distribution across the vertical section of the oil slick on moving water. The velocity profile was found to be the combination of linear and parabolic distribution. A numerical model including spreading and dispersion was developed to describe the oil slick's early movement in the open and ice-covered water. The flume test was conducted to determine the dispersion coefficients (K x ) and the effects of velocity and wave height on the slick's dispersion were also investigated. In the open water, K x increased from 4.34 cm 2 /s to 20.08 cm 2 /s as the velocity changed from 3 cm/s to 12 cm/s. A coefficient β that characterized K x fluctuated at 1.5 when wave heights were between 20 mm and 70 mm. Under ice, the slick didn't move until the velocity exceeded 6 cm/s and K x increased from 2.69 cm 2 /s to 5.64 cm 2 /s as the velocity changed from 6 cm/s to 12 cm/s. β remained 0.4 when wave heights were between 20 mm and 60 mm. The model performed very well in predicting the slick's position and length during the gravitation-inertia phase for the two situations when relevant dispersion coefficients were input.

The Influence of Meteorology-Oceanography Factors on Spatial Distribution of Oil and Grease Pollutant in Donan Estuary, Cilacap

“…The change in current velocity is inversely proportional to the oil and grease concentration value of each station. Generally, as the velocity increased, the oil and grease would drift faster and contaminate area would be larger (Peishi et al, 2011). In this research, the difference in proximity to the source is suspected to be the cause of this condition.…”

A Role for Newly Developed Sorbents in Remediating Large‐Scale Oil Spills: Reviewing Recent Advances and Beyond

“…[60][61][62][63] The oil weathering process involves spreading, evaporation, dispersion, emulsification, and oxidation (Figure 2). [64][65][66][67][68][69] Although spreading and horizontal dispersion both begin immediately once a spill occurs, [70][71][72] spreading stopped within a day, while dispersion continues for up a week. [73] For many oil spills, evaporation is the process that will affect the mass balance.…”

Numerical Simulation of Crude Oil Dispersion in Water

“…The results of work were presented in form of oil concentration profiles showing the variation of mass fraction of water absorbed by the dispersed oil with depth. Peishi et al [11] developed a numerical model describing spreading and dispersion for early movement of oil slick in open and ice-covered water. The dispersion coefficient was determined in the work using flume test and the effects of velocity and wave height on the dispersion of slick were investigated.…”