Environmental Geochemistry

Acid sulfate soils

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East Trinity: a national demonstration site for innovative acid sulfate soil management
The aim of this site is to trial and assess the efficacy of innovative hydrogeochemical control methods and risk assessment methods on acid sulfate contaminant remediation on a field scale in a nationally-significant location.
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Arsenic geochemistry

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Arsenic mobility in re-flooded soils
Southern Cross GeoScience's research aims to understand the geochemical processes controlling arsenic mobility in re-flooded soils. In particular the interactions between arsenic and minerals that are common in such soils (e.g. schwertmannite).
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Sulfur geochemistry

Fe (III)

Schwertmannite stability in wetland soils
A research stream within Southern Cross GeoScience aims at understanding the stability of schwertmannite in acid-sulfate soil environments. Schwertmannite is a ferric-oxyhydroxysulfate mineral that forms in acidic, iron- and sulfate-rich waters.
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Iron geochemistry

Changes in (a) XRD and (b) S ZANES spectra during oxidation of an FeS-rich acid-sulfate soil material

Iron-monosulfide formation and oxidation in acid-sulfate soils
Poor water quality in acid sulfate soil (ASS) landscapes is a widely recognised international problem. Research and management over the past three decades have focused largely on pyrite oxidation and the release of acid-sulfate leachate into floodplain waterways.
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Iron sulfide formation and element mobility in sulfidogenic environments
Understanding the formation of iron sulfides and the mobility of elements, particularly iron and arsenic, is an important aspect of managing wetland soils, benthic sediments and groundwater systems. This is a rapidly expanding area of research within Southern Cross GeoScience, supported by a 5-year Australian Research Council Project.
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Coastal Floodplain Wetlands

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Estuarine water quality
The impact of coastal floodplain drainage systems on estuarine water quality is a significant resource management issue. The water quality of many coastal estuaries in eastern Australia is periodically degraded via acidification and deoxygenation.
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Freshwater Remediation

Freshwater remediation of acid sulfate soils and biogeochemical redox cycling of Fe-S-C in the rhizosphere
A variety of remediation techniques have been developed to reduce the impacts of acid sulfate soil wetland drainage on downstream water quality. This study explores the geochemical consequences of freshwater re-flooding of two acid sulfate soil wetlands.
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Hydrology, biogeochemistry and management of drained coastal acid sulfate soil backswamps in the lower Clarence River floodplain
Drainage systems on coastal floodplains have greatly increased the rate of acidity entering creeks and estuaries from acid sulfate soils.
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Impacts of climate change on coastal floodplain wetland biogeochemistry 300-300

Impacts of climate change on coastal floodplain wetland biogeochemistry and surface water quality
There is broad community concern about global warming, climate change and rising sea-levels.
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Wetland biogeochemistry
Biogeochemical processes in coastal wetlands are highly dynamic. They involve complex interactions between hydrology, vegetation communities, mineralogical transformations and the cycling of redox sensitive elements.
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River basin and Water Shed

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Fluvial geomorphology and riverine processes
Fluvial depositional sequences such as alluvial floodplains and terraces are significant features in the geomorphic development of inland channel systems.
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Restoring hydrological connectivity of surface and ground waters: biogeochemical processes and environmental benefits
This project examines the restoration of lateral hydrological connectivity to improve floodplain structure and function.
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