摘要：

Desalination of seawater produces brine, wastewater containing a high salt concentration to be disposed of into the environment. It is common practice for coastal seawater desalination plants to discharge the brine waste into the sea via an outfall at some distance from the beach. In Kish Island is the one of the most important seawater desalination plant which located in the Southern coast of Iran. It is important to understand how brine is dispersed into the sea so that we can minimize its potential environmental impact. One factor that affects the mixing of brine discharges is the tidal current. The tidal currents transports brine plumes back and forth before eventually dispersing it into the sea. As a seawater desalination plant is continuously disposing of brines at a constant rate, unacceptably high salinity in coastal water on both sides of the outfall are created due to the flow reversals. Therefore, it is important to optimize the intake location. In this study, the effect of a tidally oscillating flow in dispersing brine waste discharge into the sea has been studied using a two-dimensional model, MIKE21 and results are presented graphically by plotting contours of concentration. It is found that not only are the plumes spreading far downstream of the outfall along the beach, but due to the flow oscillation, the plumes are also spreading towards the upstream side of the outfall. With attentive to results we forecast two fine positions for intake layout.

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