2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2018 | 10:00 AM - 10:15 AM | EVALUATING THE ECOLOGICAL AND BIOGEOCHEMICAL CONSEQUENCES OF PREFERENTIAL FLOW PROCESSES AT SEDIMENT/WATER INTERFACES | 410 B
EVALUATING THE ECOLOGICAL AND BIOGEOCHEMICAL CONSEQUENCES OF PREFERENTIAL FLOW PROCESSES AT SEDIMENT/WATER INTERFACES
We are working to advance a combined geoelectrical and heat tracing methodology to identify and characterize preferential flow processes that are influential to stream ecosystems, especially biogeochemical cycling and benthic habitats. First, we will show how the use of bulk geoelectrical measurements that are paired with fluid sampling during conductive tracer injections can quantify solute exchange at the centimeter-scale in streambed sediments. Reactive tracers can be overlaid with these geoelectrical experiments to reveal hidden processes, such as anaerobic nitrogen cycling in bulk-oxic sediments, providing direct evidence for theorized anoxic microzones in less-mobile porosity. Second, at larger scales, we will show how infrared and fiber-optic distributed temperature sensing can locate focused discharge points that create preferential spawning sites for brook trout (Salvelinus fontinalis). We show how dozens of stable groundwater discharge points were identified over multiple years in a coastal stream, yet only a small number are used for redd development, where groundwater is oxygen-rich. Further, we are developing a watershed-scale trout habitat analysis using paired air and stream temperature signal characteristics (phase/amplitude) that can efficiently assess effective groundwater depth and its relative influence on stream temperatures.
- Hydrology
- Biogeochemistry
- Hyporheic
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Presenters/Authors
Martin Briggs
(), U. S. Geological Survey, Hydrogeophysics Branch, Storrs, Connecticut, USA, mbriggs@usgs.gov;
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Jay Zarnetske
(), Department of Earth and Environmental Sciences, Michigan State University, jpz@msu.edu;
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Farzaneh MP Dehkordy
(), University of Connecticut, f.mahmoodpoor@uconn.edu ;
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Tyler Hampton
(), Department of Earth and Environmental Sciences, Michigan State University, USA, thampton@msu.edu;
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Fred Day-Lewis
(), U. S. Geological Survey, Hydrogeophysics Branch, Storrs, Connecticut, USA, daylewis@usgs.gov;
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Kamini Singha
(), Department of Geology and Geological Engineering, Colorado School of Mines, Golden, CO, USA, ksingha@mines.edu;
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Zachary Johnson
(), U.S. Geological Survey, Washington Water Science Center, zach.c.johnson3@gmail.com ;
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Nathaniel Hitt
(), U.S. Geological Survey, Leetown Science Center, nhitt@usgs.gov;
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Craig Snyder
(), U.S. Geological Survey's (USGS) , cdsnyder02@gmail.com ;
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Steve Hurley
(), MA-FWS, steve.hurley@state.ma.us ;
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Jud Harvey
(), U. S. Geological Survey, National Research Program, Reston, VA, USA, jwharvey@usgs.gov;
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John Lane
(), U. S. Geological Survey, Hydrogeophysics Branch, Storrs, Connecticut, USA, jwlane@usgs.gov;
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