An oil slick will not usually stay in the same position but will drift under the influence of external factor. (winds, waves, tides and currents).
The slick will rapidly become elongated and will form windrows.
Typically it will move at between 2% and 5% of the speed of the wind measured 10 m above the water surface.In open water, 3% of the wind speed is normally used to estimate drift rate.
Current regime may be constant but more commonly vary in strength and direction over time.
The strength and direction of tidal streams will influence the movement of the slick in the short term ,But As a rule, oil will move on water with 3% of the wind’s energy
and 100% of the current. A resultant trajectory can therefore be calculated for the expected impact of the oil spill.
بقعة الزيت لا تمكث فى الغالب فى نفس موقعها وانما تتحرك ويتحم فى ذلك كل من(الرياح والتيار والامواج) وتتحرك تقريبا مابين 2%الى5% من اتجاه سرعة الرياح ويتحكم بها اتجاه التيار كليا
ولكن المتعارف علية بقعة الزيت تتحرك اتجاه 3% من سرعة الرياح
و100%من اتجاه التيار
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The influence 0f 3% of the wind speed with 100% of the current result in the movement of oil from A to B
نتيجة محصلة اتجاه 3%من الرياح واتجاه 100%من التيار
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