2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/24/2018 | 2:15 PM - 2:30 PM | LIMITS AND LOCATION OF DENITRIFICATION AT CATCHMENT SCALES: CAN HYPORHEIC AND RIPARIAN REMOVAL SOLVE DIFFUSE NUTRIENT POLLUTION? | 310 A

LIMITS AND LOCATION OF DENITRIFICATION AT CATCHMENT SCALES: CAN HYPORHEIC AND RIPARIAN REMOVAL SOLVE DIFFUSE NUTRIENT POLLUTION?

Protecting or restoring stream corridors is a common approach for improving water quality. Riparian and hyporheic zones support high rates of nutrient retention and removal but represent only a small portion of the total catchment volume. Determining the relative importance of stream corridors in attenuating catchment-scale nutrient fluxes requires quantifying nutrient removal in more distal and deep catchment components, which remains a challenge. Here we present case studies integrating data from 45 locations across France and the U.S. We used multi-tracer methods to quantify the rate and total amount of denitrification at the catchment scale, including partitioning near surface (riparian and hyporheic) from deep (aquifer) denitrification. We calibrated water residence time, reaction times, and location of reactive zones using concentrations and isotopes of carbon, nitrogen, oxygen, and sulfur species, and anthropogenic dissolved gases (CFCs and SF6). We found that aquifer denitrification made up a substantial portion of catchment-level nitrogen attenuation at most sites. Without this “deeper” understanding of where and when denitrification occurs, it will not be possible to constrain the role of stream corridors in catchment nutrient budgets.

Hydrology
Hotspot
Stoichiometry

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Presenters/Authors

Benjamin Abbott (), Brigham Young University, Department of Plant and Wildlife Sciences, benabbott@byu.edu;