February 2021 Slideshow

 

The SLAC SFA program is investigating microbial and geochemical responses to hydrological processes in floodplains.

We are particularly interested in the role of fine/coarse sediment interfaces and the transport of solutes and colloids across them. By combining field investigations with laboratory experiments we systematically examine how different processes are coupled in these systems from the multimeter to the molecular scale. Our results are used in reactive transport models to improve predictions of nutrient and contaminant loading into groundwater.

2021-06-02

Exported organic carbon promotes reducing conditions and redox cycling in oxic aquifers Export of carbon from organic-enriched lenses stimulates reducing conditions in oxic sandy aquifers, promoting redox cycling in high-flow zones. Read more...

2021-06-04

Lead released from mineral phases during hydrologic redox cycles is retained by soil organic matter, limiting dissolved Pb concentrations. Dynamic hydrology drives redox changes in floodplain soils, dissolving and reprecipitating PbS and Pb adsorbed on Fe(III)-(hydr)oxides. Particulate organic matter retains released Pb prior to reprecipitation, limiting dissolved Pb concentrations. Read more...

2021-06-04

Export of carbon from organic-enriched lenses stimulates reducing conditions in oxic sandy aquifers, promoting redox cycling in high-flow zones. Read more...