Changes in water quality following tidal inundation of coastal lowland acid sulfate soil landscapes

Scott G. Johnston, Richard T. Bush, Leigh A. Sullivan, Edward D. Burton, Douglas Smith, Michelle A. Martens, Angus E. McElnea, Col R. Ahern, Bernard Powell, Luisa P. Stephens, Steve T. Wilbraham, Simon van Heel

Research output: Contribution to journalArticle

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Abstract

This study examines the remediation of surface water quality in a severely degraded coastal acid sulfate soil landscape. The remediation strategy consisted of partial restoration of marine tidal exchange within estuarine creeks and incremental tidal inundation of acidified soils, plus strategic liming of drainage waters. Time-series water quality and climatic data collected over 5 years were analysed to assess changes in water quality due to this remediation strategy. A time-weighted rainfall function (TWR) was generated from daily rainfall data to integrate the effects of antecedent rainfall on shallow groundwater levels in a way that was relevant to acid export dynamics. Significant increases in mean pH were evident over time at multiple monitoring sites. Regression analysis at multiple sites revealed a temporal progression of change in significant relationships between mean daily electrical conductivity (EC) vs. mean daily pH, and TWR vs. mean daily pH. These data demonstrate a substantial decrease over time in the magnitude of creek acidification per given quantity of antecedent rainfall. Data also show considerable increase in soil pH (2-3 units) in formerly acidified areas subject to tidal inundation. This coincides with a decrease in soil pe, indicating stronger reducing conditions. These observations suggest a fundamental shift has occurred in sediment geochemistry in favour of proton-consuming reductive processes. Combined, these data highlight the potential effectiveness of marine tidal inundation as a landscape-scale acid sulfate soil remediation strategy.

Original languageEnglish
Pages (from-to)257-266
Number of pages10
JournalEstuarine, Coastal and Shelf Science
Volume81
Issue number2
DOIs
Publication statusPublished - 2009
Externally publishedYes

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acid sulfate soils
acid sulfate soil
lowlands
remediation
water quality
rain
rainfall
soil remediation
geochemistry
drainage water
liming
meteorological data
soil
protons
acidification
electrical conductivity
water table
soil pH
time series analysis
surface water

Cite this

Johnston, Scott G. ; Bush, Richard T. ; Sullivan, Leigh A. ; Burton, Edward D. ; Smith, Douglas ; Martens, Michelle A. ; McElnea, Angus E. ; Ahern, Col R. ; Powell, Bernard ; Stephens, Luisa P. ; Wilbraham, Steve T. ; van Heel, Simon. / Changes in water quality following tidal inundation of coastal lowland acid sulfate soil landscapes. In: Estuarine, Coastal and Shelf Science. 2009 ; Vol. 81, No. 2. pp. 257-266.
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Johnston, SG, Bush, RT, Sullivan, LA, Burton, ED, Smith, D, Martens, MA, McElnea, AE, Ahern, CR, Powell, B, Stephens, LP, Wilbraham, ST & van Heel, S 2009, 'Changes in water quality following tidal inundation of coastal lowland acid sulfate soil landscapes', Estuarine, Coastal and Shelf Science, vol. 81, no. 2, pp. 257-266. https://doi.org/10.1016/j.ecss.2008.11.002

Changes in water quality following tidal inundation of coastal lowland acid sulfate soil landscapes. / Johnston, Scott G.; Bush, Richard T.; Sullivan, Leigh A.; Burton, Edward D.; Smith, Douglas; Martens, Michelle A.; McElnea, Angus E.; Ahern, Col R.; Powell, Bernard; Stephens, Luisa P.; Wilbraham, Steve T.; van Heel, Simon.

In: Estuarine, Coastal and Shelf Science, Vol. 81, No. 2, 2009, p. 257-266.

Research output: Contribution to journalArticle

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T1 - Changes in water quality following tidal inundation of coastal lowland acid sulfate soil landscapes

AU - Johnston, Scott G.

AU - Bush, Richard T.

AU - Sullivan, Leigh A.

AU - Burton, Edward D.

AU - Smith, Douglas

AU - Martens, Michelle A.

AU - McElnea, Angus E.

AU - Ahern, Col R.

AU - Powell, Bernard

AU - Stephens, Luisa P.

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AU - van Heel, Simon

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