2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/20/2019 | 3:00 PM - 3:15 PM | ORGANIC MATTER IN NESTED CATCHMENTS: DECREASING VARIABILITY WITH INCREASING STREAM ORDER | 151 G
ORGANIC MATTER IN NESTED CATCHMENTS: DECREASING VARIABILITY WITH INCREASING STREAM ORDER
As an expansion to the framework provided by the River Continuum Concept, Creed et al. 2015 proposed rivers behave as a “chemostat” with organic matter variability decreasing with increasing stream order. Long-term data collected as part of the Boulder Creek Critical Zone Observatory was used to test these concepts. Samples were collected on a weekly basis for 4+ years from both the Boulder Creek Watershed and a smaller subcatchment within the watershed. Samples were analyzed for base cations, anions and water isotopes as well as the DOC concentration. The DOM chemistry was also assessed with UV-Vis and fluorescence spectroscopy. The span of data included both wet and dry years to assess behavior across a range of flow conditions as well as seasonal cycles. Boulder Creek demonstrates a classic snow-dominated hydrology, with peaks in flow in late spring and a DOC peak immediately before peak discharge. The subcatchment had a much flashier hydrology than the larger watershed, with both higher overall DOC concentration and greater variability in both DOC concentration and DOM chemistry. The corresponding hydrochemical data suggests that hydrologic flowpaths significantly control the DOM chemistry in the subcatchment.
- Biogeochemistry
- Hydrology
- Connectivity
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Presenters/Authors
Rachel Gabor
(), The Ohio State University, gabor.40@osu.edu;
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Diane McKnight
(), University of Colorado, diane.mcknight@colorado.edu;
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