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Bian, F, Coleborn, K, Flemons, I, Baker, A, Treble, PC, Hughes, CE, Baker, A, Andersen, MS, Tozer, MG, Duan, W, Fogwill, CJ and Fairchild, IJ (2019) Hydrological and geochemical responses of fire in a shallow cave system. Science of the Total Environment, 662. 180 - 191. ISSN 1879-1026
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Abstract
The influence of wildfire on surface soil and hydrology has been widely investigated, while its impact on the karst vadose zone is still poorly understood. A moderate to severe experimental fire was conducted on a plot (10 m × 10 m) above the shallow Wildman's Cave at Wombeyan Caves, New South Wales, Australia in May 2016. Continuous sampling of water stable isotopes, inorganic geochemistry and drip rates were conducted from Dec 2014 to May 2017. After the fire, drip discharge patterns were significantly altered, which is interpreted as the result of increased preferential flows and decreased diffuse flows in the soil. Post-fire drip water δ18O decreased by 6.3‰ in the first month relative to the average pre-fire isotopic composition. Post-fire monitoring showed an increase in drip water δ18O in the following six months. Bedrock related solutes (calcium, magnesium, strontium) decreased rapidly after the fire due to reduced limestone dissolution time and potentially reduced soil CO2. Soil- and ash-derived solutes (boron, lead, potassium, sodium, silicon, iodine and iron) all decreased after the fire due to volatilisation at high temperatures, except for SO42-. This is the first study to understand the hydrological impact from severe fires conducted on a karst system. It provides new insights on the cave recharge process, with a potential explanation for the decreased d18O in speleothem-based fire study, and also utilise the decreased bedrock solutes to assess the wildfire impacts both in short and long time scales.
Item Type: | Article |
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Additional Information: | The final version of this article can be found online athttps://www.sciencedirect.com/science/article/pii/S0048969719301214?via%3Dihub |
Uncontrolled Keywords: | Karst; Fire; Hydrograph analysis; Groundwater |
Subjects: | G Geography. Anthropology. Recreation > G Geography (General) |
Divisions: | Faculty of Natural Sciences > School of Geography, Geology and the Environment |
Related URLs: | |
Depositing User: | Symplectic |
Date Deposited: | 13 Dec 2019 14:16 |
Last Modified: | 27 Jan 2020 16:09 |
URI: | https://eprints.keele.ac.uk/id/eprint/6679 |
Available Versions of this Item
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Hydrological and geochemical responses of fire in a shallow cave system. (deposited 04 Jun 2019 09:54)
- Hydrological and geochemical responses of fire in a shallow cave system. (deposited 13 Dec 2019 14:16) [Currently Displayed]