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Designing tools to predict and mitigate impacts on water quality following the Australian 2019/2020 wildfires: Insights from Sydney's largest water supply catchment

Jonay Neris, Cristina Santin Nuno, Roger Lew, Peter R. Robichaud, William J. Elliot, Sarah A. Lewis, Gary Sheridan, Ann‐Marie Rohlfs, Quinn Ollivier, Lorena Oliveira, Stefan Doerr Orcid Logo, Jonay Neris Tome

Integrated Environmental Assessment and Management, Volume: 17, Issue: 6, Pages: 1151 - 1161

Swansea University Authors: Cristina Santin Nuno, Stefan Doerr Orcid Logo, Jonay Neris Tome

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DOI (Published version): 10.1002/ieam.4406

Abstract

The 2019/20 Australian bushfires (or wildfires) burned the largest forested area in Australia's recorded history, with major socio‐economic and environmental consequences. Among the largest fires was the 280,000 ha Green Wattle Creek Fire which burned large forested areas of the Warragamba catc...

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Published in: Integrated Environmental Assessment and Management
ISSN: 1551-3777 1551-3793
Published: Wiley 2021
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spelling 2021-10-29T16:44:20.4074247 v2 56457 2021-03-17 Designing tools to predict and mitigate impacts on water quality following the Australian 2019/2020 wildfires: Insights from Sydney's largest water supply catchment 993c82cbaf875c1268156360e83c4dfd Cristina Santin Nuno Cristina Santin Nuno true false 575eb5094f2328249328b3e43deb5088 0000-0002-8700-9002 Stefan Doerr Stefan Doerr true false bc8475d9297bd8441f68d13a94585ce1 Jonay Neris Tome Jonay Neris Tome true false 2021-03-17 FGSEN The 2019/20 Australian bushfires (or wildfires) burned the largest forested area in Australia's recorded history, with major socio‐economic and environmental consequences. Among the largest fires was the 280,000 ha Green Wattle Creek Fire which burned large forested areas of the Warragamba catchment. This protected catchment provides critical ecosystem services for Lake Burragorang, one of Australia's largest urban supply reservoirs delivering ~85 % of the water used in Greater Sydney. WaterNSW is the utility responsible for managing water quality in Lake Burragorang. Its postfire risk assessment, carried out in collaboration with researchers in Australia, the UK and USA, involved i) identifying pyrogenic contaminants in ash and soil; ii) quantifying ash loads and contaminant concentrations across the burned area; and iii) estimating the probability and quantity of soil, ash and associated contaminants entrainment for different rainfall scenarios. The work included refining the capabilities of the new WEPPcloud‐WATAR‐AU model (Water Erosion Prediction Project cloud‐Wildfire Ash Transport And Risk‐Australia) for predicting sediment, ash and contaminants transport, aided by outcomes from previous collaborative post‐fire research in the catchment. Approximately two weeks after the Green Wattle Creek Fire was contained, an extreme rainfall event (~276 mm in 72 h), caused extensive ash and sediment delivery into the reservoir. The risk assessment informed on‐ground monitoring and operational mitigation measures (deployment of debris‐catching booms and adjustment of the water supply system configuration), ensuring the continuity of safe water supply to Sydney. WEPPcloud‐WATAR‐AU outputs can prioritize recovery interventions for managing water quality risks by quantifying contaminants on the hillslopes, anticipating water contamination risk, and identifying areas with high susceptibility to ash and sediment transport. This collaborative interaction among scientists and water managers, aimed also at refining model capabilities and outputs to meet managers’ needs, exemplifies the successful outcomes that can be achieved at the interface of industry and science. Journal Article Integrated Environmental Assessment and Management 17 6 1151 1161 Wiley 1551-3777 1551-3793 drinking water, bushfire, wildfire ash, water contamination risk modeling 1 11 2021 2021-11-01 10.1002/ieam.4406 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University External research funder(s) paid the OA fee (includes OA grants disbursed by the Library) NERC NE/R011125/1 2021-10-29T16:44:20.4074247 2021-03-17T11:01:17.8145478 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Jonay Neris 1 Cristina Santin Nuno 2 Roger Lew 3 Peter R. Robichaud 4 William J. Elliot 5 Sarah A. Lewis 6 Gary Sheridan 7 Ann‐Marie Rohlfs 8 Quinn Ollivier 9 Lorena Oliveira 10 Stefan Doerr 0000-0002-8700-9002 11 Jonay Neris Tome 12 56457__21373__d0540fa1ecb9419d934359488d2c201a.pdf 56457.pdf 2021-10-29T16:41:39.2643944 Output 2906928 application/pdf Version of Record true This is an open access article under the terms of the Creative Commons Attribution License true eng http://creativecommons.org/licenses/by/4.0/
title Designing tools to predict and mitigate impacts on water quality following the Australian 2019/2020 wildfires: Insights from Sydney's largest water supply catchment
spellingShingle Designing tools to predict and mitigate impacts on water quality following the Australian 2019/2020 wildfires: Insights from Sydney's largest water supply catchment
Cristina Santin Nuno
Stefan Doerr
Jonay Neris Tome
title_short Designing tools to predict and mitigate impacts on water quality following the Australian 2019/2020 wildfires: Insights from Sydney's largest water supply catchment
title_full Designing tools to predict and mitigate impacts on water quality following the Australian 2019/2020 wildfires: Insights from Sydney's largest water supply catchment
title_fullStr Designing tools to predict and mitigate impacts on water quality following the Australian 2019/2020 wildfires: Insights from Sydney's largest water supply catchment
title_full_unstemmed Designing tools to predict and mitigate impacts on water quality following the Australian 2019/2020 wildfires: Insights from Sydney's largest water supply catchment
title_sort Designing tools to predict and mitigate impacts on water quality following the Australian 2019/2020 wildfires: Insights from Sydney's largest water supply catchment
author_id_str_mv 993c82cbaf875c1268156360e83c4dfd
575eb5094f2328249328b3e43deb5088
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author_id_fullname_str_mv 993c82cbaf875c1268156360e83c4dfd_***_Cristina Santin Nuno
575eb5094f2328249328b3e43deb5088_***_Stefan Doerr
bc8475d9297bd8441f68d13a94585ce1_***_Jonay Neris Tome
author Cristina Santin Nuno
Stefan Doerr
Jonay Neris Tome
author2 Jonay Neris
Cristina Santin Nuno
Roger Lew
Peter R. Robichaud
William J. Elliot
Sarah A. Lewis
Gary Sheridan
Ann‐Marie Rohlfs
Quinn Ollivier
Lorena Oliveira
Stefan Doerr
Jonay Neris Tome
format Journal article
container_title Integrated Environmental Assessment and Management
container_volume 17
container_issue 6
container_start_page 1151
publishDate 2021
institution Swansea University
issn 1551-3777
1551-3793
doi_str_mv 10.1002/ieam.4406
publisher Wiley
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Geography{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Geography
document_store_str 1
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description The 2019/20 Australian bushfires (or wildfires) burned the largest forested area in Australia's recorded history, with major socio‐economic and environmental consequences. Among the largest fires was the 280,000 ha Green Wattle Creek Fire which burned large forested areas of the Warragamba catchment. This protected catchment provides critical ecosystem services for Lake Burragorang, one of Australia's largest urban supply reservoirs delivering ~85 % of the water used in Greater Sydney. WaterNSW is the utility responsible for managing water quality in Lake Burragorang. Its postfire risk assessment, carried out in collaboration with researchers in Australia, the UK and USA, involved i) identifying pyrogenic contaminants in ash and soil; ii) quantifying ash loads and contaminant concentrations across the burned area; and iii) estimating the probability and quantity of soil, ash and associated contaminants entrainment for different rainfall scenarios. The work included refining the capabilities of the new WEPPcloud‐WATAR‐AU model (Water Erosion Prediction Project cloud‐Wildfire Ash Transport And Risk‐Australia) for predicting sediment, ash and contaminants transport, aided by outcomes from previous collaborative post‐fire research in the catchment. Approximately two weeks after the Green Wattle Creek Fire was contained, an extreme rainfall event (~276 mm in 72 h), caused extensive ash and sediment delivery into the reservoir. The risk assessment informed on‐ground monitoring and operational mitigation measures (deployment of debris‐catching booms and adjustment of the water supply system configuration), ensuring the continuity of safe water supply to Sydney. WEPPcloud‐WATAR‐AU outputs can prioritize recovery interventions for managing water quality risks by quantifying contaminants on the hillslopes, anticipating water contamination risk, and identifying areas with high susceptibility to ash and sediment transport. This collaborative interaction among scientists and water managers, aimed also at refining model capabilities and outputs to meet managers’ needs, exemplifies the successful outcomes that can be achieved at the interface of industry and science.
published_date 2021-11-01T04:11:26Z
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