2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2019 | 2:15 PM - 2:30 PM | INTERMITTENT STREAM DYNAMICS AT THE CATCHMENT SCALE: CAPTURING STREAMBED INTERACTIONS FROM FIRST ORDER TRIBUTARIES TO THE MAINSTEM | 151 G
INTERMITTENT STREAM DYNAMICS AT THE CATCHMENT SCALE: CAPTURING STREAMBED INTERACTIONS FROM FIRST ORDER TRIBUTARIES TO THE MAINSTEM
Infiltration along intermittent and ephemeral stream channels affects streamflow permanence, wetting-drying dynamics, and flow magnitudes, thus determining the biological processes critical for biotic communities’ seasonal colonization and catchment health. The permeability of streambed sediments controls infiltration; therefore, we need to understand variability in streambed sediments throughout stream basins. However, catchment-scale studies of streambed characteristics are rare; most often, we use point, transect, or short-reach measurements, which do not lend themselves to upscaling.
Using continuous measurements of shallow geophysics, we surveyed 30 km (9% of total channel length) of dry stream channel in a small catchment in South Australia, including first to fifth order stream reaches across five soil types. The results show changes in apparent conductivity down to 4 m below ground. The data reveals the longitudinal and vertical patchiness of streambed sediments, identifies a clogging layer at the streambed surface, and suggests areas of sandy vs clayey sediments. This work provides a rare glimpse into catchment-scale streambed dynamics, as well as important lessons on researcher- landowner dynamics in a small catchment.
- Watershed
- Spatial
- Connectivity
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Presenters/Authors
Margaret Shanafield
(), Flinders University, margaret.shanafield@flinders.edu.au;
ASHA DISCLOSURE:
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Nonfinancial -
Karina Gutierrez-Jurado
(), Flinders University, karina.gutierrez@flinders.edu.au;
ASHA DISCLOSURE:
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Nonfinancial -