2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/22/2018 | 2:15 PM - 2:30 PM | THREE-DIMENSIONAL CONNECTIVITY OF RUNOFF SOURCE AREAS DRIVE STREAM HYDRO-BIOGEOCHEMICAL SIGNALS ACROSS AN EPHEMERAL-TO-PERENNIAL DRAINAGE NETWORK | 310 B
THREE-DIMENSIONAL CONNECTIVITY OF RUNOFF SOURCE AREAS DRIVE STREAM HYDRO-BIOGEOCHEMICAL SIGNALS ACROSS AN EPHEMERAL-TO-PERENNIAL DRAINAGE NETWORK
The balance between longitudinal, lateral, and vertical expansion and contraction of hydrologic flowpaths and source areas across spatial scales in headwater catchments is poorly understood. To address this, we collected chemical and hydrometric data from zero through second order catchments in the Piedmont region of North Carolina, USA to characterize spatiotemporal runoff and overland, shallow soil, and deep subsurface flow across characteristic landscape elements. We also conducted 77 mapping campaigns of flow permanence across the ephemeral-to-perennial stream network. We determined that the active stream network was driven by two superimposed runoff generation regimes, event-driven and baseflow-associated, that produced distinct hydro-biogeochemical signals at the catchment outlets at two spatial scales. Frequently activated shallow subsurface flowpaths in the terrestrial landscape drove an increase in dissolved organic carbon (DOC) concentrations with increases in runoff across both catchments. DOC-runoff relationship variability was driven by a balance between runoff generation regimes and seasonal depletion of DOC from shallow flowpath activation. We suggest that the hydro-biogeochemical signals at larger watershed outlets can be driven by a balance of longitudinal, lateral, and vertical source area contributions that are mediated by climate and critical zone structure and stratigraphy.
- Connectivity
- Aquatic-terrestrial Linkage
- Watershed
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Presenters/Authors
Margaret Zimmer
(), University of California, Santa Cruz, margaret.zimmer@ucsc.edu;
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Brian McGlynn
(), Duke University, brian.mcglynn@duke.edu;
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