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Meanders of the Colorado River Shown Beneficial to Water Quality2 min read

by Christina Procopiou on October 19, 2018

GC-Future Water Publication Research Highlight

 

Intrameander hyporheic zones display distinct anoxic and suboxic regions, suboxic regions being localized along sides of the meander bend.

 

Scientists who study the exchange of chemicals in rivers and streams examine activity taking place within the nutrient-rich portions of streambeds, floodplains, and riverbanks known as hyporheic zones – which provide habitat for various aquatic organisms. Berkeley Lab researchers investigating hyporheic exchange have now shown that meanders near the headwaters of the Colorado River absorb metals and excess nutrients during certain river conditions, thus helping sustain river water quality.

A recent paper published in the journal Water Resources Research, and of which EESA research scientist Dipankar Dwivedi is lead author, describes discoveries made by the Watershed Function Scientific Focus Area (SFA) program team at Berkeley Lab. The researchers conducted their study in an area along the East River catchment near the Upper Colorado River headwaters. 

Hyporheic zones perform important ecological functions by linking terrestrial and aquatic systems within watersheds. Composed of nutrient-rich sediment, these water-filled spaces between grains of unconsolidated sediment can act as a source or sink for various metals and nutrients. Dwivedi and his team explored the influence of factors such as groundwater flow dynamics, river-stage fluctuations, and rainfall or snowfall on interactions between nutrient-rich groundwater and oxygen-rich river water in the hyporheic zone.

The study is the first of its kind to apply data from field observations to research into the influence of transient hydrological conditions on the hyporheic biogeochemistry. Using high-resolution hydrodynamic assessments of the hyporheic zone combined with detailed pore-water sampling, the researchers sought to quantify subsurface exports of carbon, iron, and other geochemical species from a single meander to the river under these changing conditions.

Simulation results demonstrated that intra-meander hyporheic zones display distinct anoxic and suboxic regions, the latter localized along sides of the meander bend. The work also showed that permeability has a more significant impact on biogeochemical zonation compared to the reaction pathways for transient hydrologic conditions, and that micro-topographic features such as gullies have outsized influence over chemical reactions that involve the transfer of electrons between two species, or redox processes.

News & Events

EGD Postdoc Fellow Receives Young Researcher Presenter Award1 min read

January 21, 2021

Pramod Bhuvankar, an EGD postdoctoral fellow working with research scientist Abdullah Cihan, received a Young Researcher Presenter Award during the 2020 Computational Methods in Water Resources conference in December. His presentation, “Pore-scale simulations of permeability decline in porous media due to fines migration,” described a pore-scale CFD study of clay mobilization in porous media due…

Berkeley Lab Partners with International Collaborators in Geothermal Energy Research1 min read

January 20, 2021

  Scientists from the Energy Geosciences Division have begun working with European partners on three new geothermal research projects through the Department of Energy’s membership in GEOTHERMICA, a transnational consortium that combines the in-country financial resources and research expertise of 15 participating countries to demonstrate and validate novel concepts in geothermal energy use. This marks the…

EESA Senior Scientist Talks Earthquake Building Resilience1 min read

Berkeley Lab senior scientist David McCallen leads a subproject called Earthquake Sim, or EQSIM, for the DOE’s Energy Exascale Computing Project. He is also professor and director of the Center for Civil Engineering Earthquake Research in the Department of Civil and Environmental Engineering at the University of Nevada, Reno. McCallen recently spoke with Scott Gibson of…

EESA Scientist Coauthors New Comprehensive Guide on Removing CO2 from the Atmosphere2 min read

January 18, 2021

Berkeley Lab researchers are working on ways to sequester more carbon in soil, including through agricultural practices. (Credit: Berkeley Lab) Scientists say that any serious plan to address climate change should include carbon dioxide removal (CDR) technologies and policies, which makes the newly launched CDR Primer an especially vital resource, says Berkeley Lab scientist Margaret Torn, one…

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