Field Measurements of Velocity and Physical Parameters of Seawater and Numerical Modeling of Brine Discharge from the Desalination Plant in the Southeastern Coast of Kish Island-Iran

Abstract Temperature, salinity, water-level and current speed around brine outflow of desalination site in the Southeastern Coast of Kish Island is investigated. The dominant current is east-west tidal current with a weak residual current which affects current field partially southward. The brine discharge driven hypersaline pollution dispersion is simulated applying MIKE 21, considering three outflow locations at depths of 1, 3 and 6 meters. The seawater salinity affected by brine discharge oscillates similar to tidal fluctuation, but with a phase difference ~180 degrees. The maximum influence from the outflow on adjacent seawater is occurred during neap tide. The outflow mainly moves along the coastline due to the tidal current. The discharge in depth of 3 m, is the optimal location. Finally, the best discharging method is calculated by Jirka (2008)‘s code which determines the 45° angle between wastewater pipeline-seabed and the creation of 5 diffusers at the discharge position.