首页|Changes in DOM and alum doses for two rivers of contrasting catchments after intense wildfires

Changes in DOM and alum doses for two rivers of contrasting catchments after intense wildfires

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  • NETL
  • NSTL
  • Iwa Publishing
The dynamics of dissolved organic matter (DOM) in two river waters were investigated after their catchments had been severely burnt in the 2019/2020 Australian wildfires. Shortly after these wildfires, dissolved organic carbon (DOC) concentrations were recorded at high levels (similar to 19 and 30 mg/L) and these became much lower (up to similar to 80% less) in the following winter when river flows had increased. Satellite imagery-based data indicated up to 95% of catchment areas burnt and up to similar to 50% subsequent vegetation recoveries after 2 years. Shifts in burn index values for the burnt areas coincided with DOC concentration variations. The specific colour of waters increased up to 40% as daily river flows increased, indicating higher input of humic content from the burnt catchments. Chlorophyll a was detected at the highest levels in the waters soon after the fires when river flows were lowest. Enhanced alum doses were predicted using two feed-forward models; one based on DOC and turbidity data and the other based on UV@254 nm, colour, and turbidity. The doses predicted using the two models showed high correlations (r > 0.9) and were highest for waters directly after the fires. These models were developed for diverse source waters including those impacted by extreme climate events.

alumDOCDOMremote sensingwildfireDISSOLVED ORGANIC-MATTERNORMALIZED BURN RATIODRINKING-WATERENHANCED COAGULATIONBRDF CORRECTIONVEGETATIONSEVERITYREMOVALQUALITYSURFACE

Daraei, Hiua、Awad, John、Leavesley, Adam、Agnew, Mark、Jones, Eriita、Gale, Matthew、Cinque, Kathy、Bertone, Edoardo、van Leeuwen, John

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University of South Australia STEM Academic Unit||Griffith University School of Engineering and Built Environment||Griffith University Cities Research Institute

University of South Australia STEM Academic Unit||CSIRO Environm

Environm Planning & Sustainable Dev Directorate

Kangaroo Isl Landscape Board

University of South Australia STEM Academic Unit||Curtin University School of Earth and Planetary Sciences

Australian National University Fenner School of Environment and Society

Melbourne Water

Griffith University School of Engineering and Built Environment||Griffith University Cities Research Institute||Griffith University Australian Rivers Institute

University of South Australia STEM Academic Unit

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2024

10.2166/wcc.2024.281

Journal of water and climate change

Journal of water and climate change

EISCI
ISSN：2040-2244
年,卷(期)：2024.15(11/12)
  • 57