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The Impact of Extreme Low Flows on the Water Quality of the Lower Murray River and Lakes (South Australia)

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  • Luke Mosley
  • Benjamin Zammit
  • Emily Leyden
  • Theresa Heneker
  • Matthew Hipsey
  • Dominic Skinner
  • Kane Aldridge

Abstract

The impact of extreme low flows on the water quality of the Lower Murray River and Lower Lakes (Alexandrina and Albert) in South Australia was assessed by comparing water quality from five sites during an extreme low flow period (March 2007–November 2009) and a preceding reference period (March 2003–November 2005). Significant increases in salinity, total nitrogen, total phosphorus, chlorophyll a and turbidity were observed in the Lower Lakes during the low flow period. Consequently, water quality guidelines for the protection of aquatic ecosystems were greatly exceeded. Principal Component Analysis, empirical and mass balance model calculations suggested these changes could be attributed primarily to the lack of flushing resulting in concentration of dissolved and suspended material in the lakes, and increased sediment resuspension as the lakes became shallower. The river sites also showed significant but more minor salinity increases during the extreme low flow period, but nutrient and turbidity concentrations decreased. The most plausible reasons for these changes were decreased catchment inputs and increased influence of saline groundwater inputs. The results highlight the vulnerability of arid and semi-arid lake systems to reduced flow conditions as a result of climatic changes and/or water management decisions. Copyright Springer Science+Business Media B.V. 2012

Suggested Citation

  • Luke Mosley & Benjamin Zammit & Emily Leyden & Theresa Heneker & Matthew Hipsey & Dominic Skinner & Kane Aldridge, 2012. "The Impact of Extreme Low Flows on the Water Quality of the Lower Murray River and Lakes (South Australia)," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 26(13), pages 3923-3946, October.
    • Handle: RePEc:spr:waterr:v:26:y:2012:i:13:p:3923-3946
    DOI: 10.1007/s11269-012-0113-2
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    References listed on IDEAS

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    1. Rabia Koklu & Bulent Sengorur & Bayram Topal, 2010. "Water Quality Assessment Using Multivariate Statistical Methods—A Case Study: Melen River System (Turkey)," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 24(5), pages 959-978, March.
    2. Intergovernmental Panel on Climate Change IPCC, 2008. "Intergovernmental Panel on Climate Change: Fourth Assessment Report: Climate Change 2007: Synthesis Report," Working Papers id:1325, eSocialSciences.
    3. G. Tsakiris & D. Pangalou & H. Vangelis, 2007. "Regional Drought Assessment Based on the Reconnaissance Drought Index (RDI)," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 21(5), pages 821-833, May.
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    Cited by:

    1. Xiao Pu & Hongguang Cheng & Lu Lu & Shengtian Yang & Jing Xie & Fanghua Hao, 2015. "Spatial Profiling and Assessing Dominance of Sources to Water Phosphorus Burden in a Shallow Lake," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 29(3), pages 715-729, February.
    2. J. Kirby & Md. Mainuddin & M. Ahmad & L. Gao, 2013. "Simplified Monthly Hydrology and Irrigation Water Use Model to Explore Sustainable Water Management Options in the Murray-Darling Basin," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 27(11), pages 4083-4097, September.
    3. Subhasis Giri & Ashok Mishra & Zhen Zhang & Richard G. Lathrop & Ali O. Alnahit, 2021. "Meteorological and Hydrological Drought Analysis and Its Impact on Water Quality and Stream Integrity," Sustainability, MDPI, vol. 13(15), pages 1-24, July.
    4. Long Trinh & Giang Vu & Peter Steen & Piet Lens, 2013. "Climate Change Adaptation Indicators to Assess Wastewater Management and Reuse Options in the Mekong Delta, Vietnam," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 27(5), pages 1175-1191, March.
    5. Tapas K. Biswas & Luke M. Mosley, 2019. "From Mountain Ranges to Sweeping Plains, in Droughts and Flooding Rains; River Murray Water Quality over the Last Four Decades," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 33(3), pages 1087-1101, February.

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