Abstract

The need to assess the probability of accidental oil spills, and their fate, in the Spencer Gulf, was one of the major problems addressed by the draft environmental impact statement for the proposed Cooper Basin liquids project facility at Stony Point, South Australia. As a first stage in the assessment of this risk, an oil spill trajectory model was constructed in order to determine the likely fate of spilled oil over all seasonal conditions. The choice of appropriate counter-measures were guided by the results of this model. Features of the model included: 1. (i) a concentration upon environmental impact assessment. To achieve this the model was biased so as to overestimate environmental damage in sensitive areas; 2. (ii) the use of a matrix wind factor to describe wind effects on the oil; 3. (iii) model verification through the use of model output statistics linking model results with field trials; 4. (iv) validation of the model with a series of experiments six months after the original field trials.

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