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| Created: | Dec 23, 2024 at 8:45 p.m. | |
| Last updated: | Dec 24, 2024 at 12:44 a.m. | |
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Abstract
Observed increases in the intensity and duration of extreme precipitation events (EPEs) worldwide are projected to continue with climate change. EPEs can affect water-table dynamics, but the extent of EPE influence and soil texture controls remain poorly understood. We led a one-dimensional modeling effort to examine how EPEs influence water-table dynamics, specifically water-table response time, displacement, recession time, and total recharge. We conducted simulations with EPE amounts of 0.20 m, 0.40 m, and 0.60 m, applied across three durations: 1-day, 7-day, and 20-day, and also used twelve soil textures to examine varying soil texture influence. Results showed water-table response in coarser-grained soils occurs in a manner of days compared to the >200 day response time of finer-grained soils. With increasing EPE amount, water-table response times shortened, varying from ~3 days (sand) to ~239 days (clay). Water-table displacement, calculated as the difference (meters) between the water-table level post-EPE versus steady state, ranged from 0.30 - 1.64 m, and is positively correlated with increasing EPE amount. Despite EPE amount or duration, water-table recession ranged from 1.2 - 3.0 years for all soils. Total recharge is calculated by considering the available porosity and water-table displacement from EPEs, with totals ranging from 17% (clay) to 97% (sand). Recharge appears to be primarily a function of EPE amount and soil properties, with the overall average recharge ~63% of the total EPE amount. Broadly, this modeling effort provides a clearer view of the influence of soil texture on groundwater response to EPEs.
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Funding Agencies
This resource was created using funding from the following sources:
| Agency Name | Award Title | Award Number |
|---|---|---|
| National Science Foundation, Division of Earth Sciences | Dynamic Response of Watershed Subsurface System to Extreme Rainfall Events | 1834290 |
How to Cite
This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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