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| Created: | Oct 28, 2021 at 3:48 p.m. | |
| Last updated: | Aug 05, 2022 at 3:37 p.m. | |
| Citation: | See how to cite this resource | |
| Content types: | File Set Content Single File Content |
| Sharing Status: | Private (Accessible via direct link sharing) |
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Abstract
Wildfire alters the hydrologic cycle, with important implications for water supply and hazards including flooding and debris flows. At rainstorm timescales, surface runoff can increase with vegetation removal and post-fire water repellency. At seasonal scales, groundwater storage can increase with a lack of evapotranspiration. However, little work has been done to understand changes in groundwater storage at the storm timescale and how this may influence post-fire discharge. To more accurately conceptualize the dynamics of post-fire hydrology during storms, we employed a combination of electrical resistivity and stable water isotope data to investigate the hydrologic response of two catchments; one burned and one unburned after the 2020 Bobcat Fire in the San Gabriel Mountains, California, USA. Electric resistivity imaging shows that in the burned catchment, rainfall infiltrated deep into the weathered bedrock and persisted. Isotope data from stormflow suggests that the amount of mixing of surface and subsurface water during storm events was similar in both catchments, despite higher discharge in the burned catchment. Therefore, both surface runoff and infiltration likely increased. The techniques used in this study help to identify the specific hydrologic processes that influence post-fire streamflow and groundwater recharge, which ultimately influences vegetation regrowth and potential post-fire landslide hazards for years after a fire.
The following repository includes the precipitation gauge data, soil infiltrometry and hydraulic conductivity data, stable water isotope data and electrical resistivity imaging data collected from December 2020- May 2022 following the 2020 Bobcat fire in the San Gabriel Mountains, near the San Gabriel Reservoir.
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This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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