EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/24/2021 | 8:30 AM - 10:30 AM | Investigating physical controls on streamflow dynamics in an intermittent and ephemeral stream network | Virtual Platform
Investigating physical controls on streamflow dynamics in an intermittent and ephemeral stream network
Drying and rewetting patterns in intermittent and ephemeral streams significantly impact biogeochemical processing and the movement of sediment, solutes, and other materials through stream networks. Despite non-perennial streams comprising the majority of stream lengths globally, the controls on these wet up and dry down dynamics are not well understood. We used 40 sensors to map the spatiotemporal presence and absence of surface flow across a 0.23 km2 catchment located in the Mediterranean climate of central coastal California. We observed large variability in wet up and dry down rates across the stream network with active surface drainage densities ranging from 0 to 25.5 km/km2. Analysis of watershed characteristics shows a complex relationship between slope, curvature, and upslope accumulated area, where the importance of each variable varies across adjacent tributaries. Further, stable water isotopes, major ions, and nutrients suggest a shift in dominant stream water sources across the wet to dry season transition. Understanding the physical controls and stream water sources that drive observed variations in flow persistence has significant implications for the ecological and biogeochemical function of non-perennial streams and managing water resources in the face of global change.
- IRES
- Geomorphology
- Major ions
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Presenters/Authors
Lauren Giggy
(), University of California, Santa Cruz, lgiggy@ucsc.edu;
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Margaret Zimmer
(), University of California, Santa Cruz, margaret.zimmer@ucsc.edu;
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