Mixing zone analysis of surface brine discharges in coastal waters

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The potential impacts of surface discharges of heated brine from a co-location power generation and seawater desalination plant in the coastal marine environment are investigated using CORMIX mixing zone model. Simulations are carried out for two scenarios: Scenario I is used to represent the positively buoyant heated brine discharge from a thermal desalination plant, and Scenario II represents the negatively buoyant heated brine discharge from a membrane desalination plant. In contrast to Scenario I, where discharge plume rises towards the surface, discharge plume for Scenario II would tend to sink and spread at the seabed. Due to inherent uncertainty in the input data, sensitivity analysis was conducted using iterative CORMIX simulations by varying the ambient velocity (to evaluate the effect of uncertainty in sea conditions), the discharge flow rate (to evaluate the effect of uncertainty on the desalination plant’s operation), the discharge density (to evaluate the effect of uncertainty on the brine characteristic) and the water depth at the open discharge channel (to evaluate the effect of uncertainty in coastal hydrographic features). Scenario I results show that the overall temperature rise is between 1.0 to 2.1oC (above ambient) at the end of the specified regulatory mixing zone of 300 m radius; and Scenario II results are in the range of 4.2 to 6.4oC (above ambient).

Original languageEnglish
Title of host publicationAquatic Ecosystems
Subtitle of host publicationInfluences, Interactions and Impact on the Environment
PublisherNova Science Publishers, Inc.
Pages67-86
Number of pages20
ISBN (Electronic)9781634846875
ISBN (Print)9781634846868
Publication statusPublished - Jan 1 2016

Keywords

  • Buoyant heated discharge
  • CORMIX
  • Environmental impacts
  • Heated dense discharge
  • Open channel
  • Regulatory mixing zone
  • Sensitivity analysis

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Environmental Science(all)

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  • Cite this

    Purnama, A., Baawain, M. S., & Shao, D. (2016). Mixing zone analysis of surface brine discharges in coastal waters. In Aquatic Ecosystems: Influences, Interactions and Impact on the Environment (pp. 67-86). Nova Science Publishers, Inc..