『Abstract
The oxidation of the iron sulfide, pyrite, in acid sulfate soil
floodplains generate substantial acidity and this acid has caused
further weathering of the soil profile. The movement of groundwater
from these soils is an important geochemical control on surface
water quality. The flux of acidified and metal-rich water during
a wet season rainfall event has been examined at two study catchments
on the Tweed River in eastern Australia. At the sites, 81 kg/ha
and 60 kg/ha of oxidisable acidity are exposed, along with Al,
Fe and Zn during the flood event. The main contributors to the
acid flux are H+, Fe and Al at the first site and whilst
Fe and Al are present in the drainage waters at the second site,
the main contributor is likely to be H+. The different
flux characteristics at the sites may be caused by different surface
soil hydraulic conductivities and oxidation history.』
1. Introduction
2. Materials and methods
2.1. Study area
2.2. Water quality monitoring
2.3. Water sampling during the rainfall event
2.4. Discharge estimates
2.5. Flux calculations
3. Results and discussion
3.1. Water quality and level monitoring
3.2. Water quality and level characteristics during the rainfall
event
3.3. Total flux from the catchments
3.4. Catchment implications
4. Conclusions
acknowledgements
References