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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >Dispersion of pollutants discharged into the ocean the interaction of small-and large-scale phenomena
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Dispersion of pollutants discharged into the ocean the interaction of small-and large-scale phenomena

机译：分散的污染物排入海洋小型和大型的互动现象

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摘要

In many coastal towns,sewage and industrial effluents are discharged via coastal outfalls into the sea.Here we study the discharge of an axisymmetric buoyant jet of less salty and colder wastewater into an unstratified stagnant sea to form a cloud of pollutant at the sea surface.We model the evolution of the temperature,salt and pollutant concentrations in the buoyant jet,polluted cloud and in the seawater surrounding the jet.The conservation equations are solved numerically.Our theoretical assumptions are supported by new experimental results.Two outfall scenarios corresponding to low and high stability of the interface between the seawater and the polluted stream are considered.We find that the interaction between double diffusion and turbulent entrainment into the buoyant jet results in a local accumulation of pollutant.When the interface stability is low,the pollutant concentration near the buoyant jet can increase by 100% compared with the magnitude expected in the absence of double-diffusion,in the timescale required for the polluted cloud to reach the coast.The effect of double diffusion on pollutant transport in the high-stability case is found to be small,as expected.
机译：在许多沿海城镇,污水和工业通过沿海排放口废水被排放进了大海。轴对称浮射流的咸和冷废水进入一个无层理的停滞的海形成一个云海洋表面的污染物。模型的演化温度、盐和在活跃的污染物浓度飞机,云在海水污染周围的飞机。数值求解。假设受到新的实验的支持结果。低和高的稳定性之间的接口海水和污流考虑。双扩散和湍流卷吸进入浮射流的结果在当地的积累的污染物。低,浮力附近的污染物浓度飞机可以增加100%级预计在缺乏双扩散,在所需的时间尺度污染云到达海岸。双重的污染物传输扩散高稳定性情况发现小预期。

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