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INCIDENT SIMULATION

Dalam dokumen Oil Spill Trajectory & Impact Analysis (Halaman 30-37)

CHAPTER 4 CHAPTER 4

4.4 INCIDENT SIMULATION

Using the data obtained the software ADIOS2 is used to model the spill scenario. The fate of oil can be predicted therefore the necessary efficient response action can be taken.

a) Open the application.

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i) Oil type - Specify the type of oil that has spilled. The standard oil in the library already has the Fuel Oil No 2 (High Aromatic Content Heating Oil). This is the diesel fuel oil and also known as Furnace Oil or Heating Oil.

The pictures shown are the basic information and properties of this oil.

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Refer- Jake, P., NAYk3. S.. Wan1 Z., Figas, M., FlNquse. 8., leabat. P., Mlm, J. 1999. Prapertlas d Cnde Oh ad Cd Pruduts. Masmipt Rot EE-165, Fm+onaartd Rotedlui 5m1ie, EnNeraesr[ Canada. Ott-, O'tb.

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Figure 7a: Oil properties; the general info

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ii) Wind and wave conditions for the northern region of Malacca Straits were obtain from Malaysia Meteorological Department. The typical pattern on October days, shows the wind speed ranging from 10 - 20 km/h in East direction and the wave height can be up to 0.5 to 1.0 meters.

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iii) Water properties in this region is average on 29.60°C with the salinity of 3l . 22ppt.

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Figure 9: Water and current properties

iv) Release information - the only information available was the amount of release. Thus, an assumption is made that is the duration is 3 hours. This is because the fuel tanker system is multiple tank thus the it will not be flowing out for too long before it dries up.

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c) the overall data input - the picture shows the overall data input just before the simulation is run.

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Figure 11: The ADIOS2 when all the data has been keyed-in

d) Run the simulation by click on solve button. It will take some times to calculate the output and generate the graph.

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Figure 12: The output (multiple graph mode)

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Figure 12a: Oil Budget Figure 12b: Oil evaporated

Figure 12c: Oil dispersed Figure 12d: Oil remaining

The Figure 12a shows the oil budget information. The evaporation, as further detailed in Figure 12b occur on the first day as much as 45%. The dispersion also rapidly occur up until the second day of the incident

Thus, the remaining oil is theoretically not significance because of those two physical reactions.

Figure 13: Oil density

Oil density information is important with respect to the comparison with ocean water density. Generally the lower density oil floats on water, however, the emulsification may occur and increase the density.

The figure shows the rapid increment at the early period. This is because a large percentage of the oil has already evaporated and dispersed.

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The viscosity also shows the same pattern as the density. This follows the general rule; the lower the density the more viscous a fluid is. The process that takes place and affect this property is also the evaporation and dispersion.

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Figure 15: Airborne Benzene

The airborne benzene is significant due to the toxic property that normally released by hydrocarbon, either crude oil or fuel oil. Excessive exposure to benzene can affect the health. As evaporation is rapidly takes place, the presence of benzene also not significance thus the area is not harmful.

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