Research Highlights

Research

Genomes of Single-Carbon Cycling Microorganisms in Floodplain Sediments

Floodplain microorganisms with genes for making methane are found deeper in the sediments where oxygen is depleted while microorganisms that can consume methane are...

June 28, 2024
Floodplain microorganisms
Research

Environmental Impact of Solution pH on the Formation and Migration of Iron Colloids in Deep Subsurface Energy Systems

Numerous  subsurface processes can promote fluid-rock interactions that can lead to the formation of small colloidal particles that are suspected to migrate through the...

December 1, 2023
Exposure of carbonate-rich rock to aqueous solution resulted in Fe mobilization and precipitation with trace metals such as Cr and Ni and the dislodgement of inert colloids such as silica.
Research

Characterization of Natural Ferrihydrite Nano-Colloids from a Redox-Active Floodplain

Colloids can transport nutrients, contaminants, and organic matter throughout watersheds. Their persistence, reactivity and heterogeneous compositions renders them key contributors to biogeochemical reactions. We...

June 30, 2023
illustration of a ferrhydrite
Research

Groundwater Quality: Microbial "Halos" Spread through Floodplain Aquifers

Floodplain groundwater is a critical resource for human activities and ecosystems. It is however increasingly threatened by climate change. While the impact of climate...

October 1, 2022
Floodplain Aquifer
Research

Export of Organic Carbon from Reduced fine-grained Zones Governs Biogeochemical Reactivity in Aquifer

The chemical composition of groundwater is determined by complex chemical and biological processes occurring in the aquifer. An important factor in this regard are...

January 24, 2022
Schematic illustration of the export of microorganisms and organic carbon substrates from a fine-grained into the coarse-grained zone of an aquifer.
Research

Soil Organic Matter Controls Pb Release During Redox Cycles In Floodplain Soils

Soil organic matter controls Pb release during redox cycles in floodplain soils   Lead released from mineral phases during hydrologic redox cycles is retained...
April 26, 2021
Low and high water diagram of Pb-POM
Research

Spatial and Compositional Heterogeneities Control Zn Retention Mechanisms in a Simulated Aquifer

  Export of carbon from organic-enriched lenses stimulates reducing conditions in oxic sandy aquifers, promoting redox cycling in high-flow zones. The Science Aquifers contain...
February 11, 2021
Fine-grained clay sediments rich in organic matter reduced iron and sulfur
Research

Hexavalent Uranium Storage Mechanisms In Wet-Dry Cycled Sediments At Contaminated DOE Sites In The Western U.S.

  Noël, V.; Boye, K.; Kukkadapu, R. K.; Li, Q.; Bargar, J. R. Uranium storage mechanisms in wet-dry redox cycled sediments. Water Research.  Water...
November 20, 2020
Process model of each drought cycle
Research

Microbial Communities In Floodplain Soils Remain Unchanged Throughout Seasonal Redox And Water Table Flux

  Fine-grained sediments appear to host distinct microbial groups that are stimulated through water table rise and fall throughout the season The Science Microbial...
August 14, 2020
Spring wet season to summer dry season graph