Regional flood frequency analysis based on peaks-over-threshold approach: A case study for South-Eastern Australia
Study region: Southeast Australia Study focus: Regional flood frequency analysis (RFFA) is a widely adopted statistical method to estimate design floods in ungauged catchments. Annual maximum flood (AMF) model is the most popular method in developing RFFA techniques. However, the AMF-based approache...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-06-01
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| Series: | Journal of Hydrology: Regional Studies |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214581823000940 |
| _version_ | 1797801771561648128 |
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| author | Xiao Pan Ataur Rahman Khaled Haddad Taha B.M.J. Ouarda Ashish Sharma |
| author_facet | Xiao Pan Ataur Rahman Khaled Haddad Taha B.M.J. Ouarda Ashish Sharma |
| author_sort | Xiao Pan |
| collection | DOAJ |
| description | Study region: Southeast Australia Study focus: Regional flood frequency analysis (RFFA) is a widely adopted statistical method to estimate design floods in ungauged catchments. Annual maximum flood (AMF) model is the most popular method in developing RFFA techniques. However, the AMF-based approaches are criticised for its limitations in the range of very frequent to frequent flood estimation. As an alternative, the peaks-over-threshold (POT) based approach has shown theoretical advantages in this flood range. POT based RFFA is currently underemployed internationally due to its complexity in modelling. This study develops POT-based RFFA techniques for south-eastern Australia using data from 151 catchments. A comparison is made between ordinary least squares (OLS) and weighted least squares (WLS) methods in developing POT-based RFFA techniques. New hydrological insights for the region: The OLS based method is found to perform better than the WLS. The median relative error values of the developed prediction equations range 31–38%. The new POT-based RFFA technique overcomes the limitations of the current Australian Rainfall and Runoff, which does not have any RFFA technique for very frequent floods. It is expected that these new POT-based RFFA technique will be used in practice in south-east Australia. |
| first_indexed | 2024-03-13T04:55:33Z |
| format | Article |
| id | doaj.art-6126b8c2efe64ef2b5fceb8f4d0ac053 |
| institution | Directory Open Access Journal |
| issn | 2214-5818 |
| language | English |
| last_indexed | 2024-03-13T04:55:33Z |
| publishDate | 2023-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Hydrology: Regional Studies |
| spelling | doaj.art-6126b8c2efe64ef2b5fceb8f4d0ac0532023-06-18T05:02:00ZengElsevierJournal of Hydrology: Regional Studies2214-58182023-06-0147101407Regional flood frequency analysis based on peaks-over-threshold approach: A case study for South-Eastern AustraliaXiao Pan0Ataur Rahman1Khaled Haddad2Taha B.M.J. Ouarda3Ashish Sharma4School of Engineering, Design and Built Environment, Western Sydney University, AustraliaSchool of Engineering, Design and Built Environment, Western Sydney University, Australia; Correspondence to: School of Engineering, Design and Built Environment, Western Sydney University, Building XB, Second Avenue, Kingswood, NSW 2751, Australia.School of Engineering, Design and Built Environment, Western Sydney University, AustraliaNational Institute of Scientific Research (INRS), Quebec, CanadaSchool of Civil and Environmental Engineering, University of New South Wales, AustraliaStudy region: Southeast Australia Study focus: Regional flood frequency analysis (RFFA) is a widely adopted statistical method to estimate design floods in ungauged catchments. Annual maximum flood (AMF) model is the most popular method in developing RFFA techniques. However, the AMF-based approaches are criticised for its limitations in the range of very frequent to frequent flood estimation. As an alternative, the peaks-over-threshold (POT) based approach has shown theoretical advantages in this flood range. POT based RFFA is currently underemployed internationally due to its complexity in modelling. This study develops POT-based RFFA techniques for south-eastern Australia using data from 151 catchments. A comparison is made between ordinary least squares (OLS) and weighted least squares (WLS) methods in developing POT-based RFFA techniques. New hydrological insights for the region: The OLS based method is found to perform better than the WLS. The median relative error values of the developed prediction equations range 31–38%. The new POT-based RFFA technique overcomes the limitations of the current Australian Rainfall and Runoff, which does not have any RFFA technique for very frequent floods. It is expected that these new POT-based RFFA technique will be used in practice in south-east Australia.http://www.sciencedirect.com/science/article/pii/S2214581823000940FloodsPeaks over thresholdAnnual maximum floodRegional flood frequency analysisAustraliaVery frequent floods |
| spellingShingle | Xiao Pan Ataur Rahman Khaled Haddad Taha B.M.J. Ouarda Ashish Sharma Regional flood frequency analysis based on peaks-over-threshold approach: A case study for South-Eastern Australia Journal of Hydrology: Regional Studies Floods Peaks over threshold Annual maximum flood Regional flood frequency analysis Australia Very frequent floods |
| title | Regional flood frequency analysis based on peaks-over-threshold approach: A case study for South-Eastern Australia |
| title_full | Regional flood frequency analysis based on peaks-over-threshold approach: A case study for South-Eastern Australia |
| title_fullStr | Regional flood frequency analysis based on peaks-over-threshold approach: A case study for South-Eastern Australia |
| title_full_unstemmed | Regional flood frequency analysis based on peaks-over-threshold approach: A case study for South-Eastern Australia |
| title_short | Regional flood frequency analysis based on peaks-over-threshold approach: A case study for South-Eastern Australia |
| title_sort | regional flood frequency analysis based on peaks over threshold approach a case study for south eastern australia |
| topic | Floods Peaks over threshold Annual maximum flood Regional flood frequency analysis Australia Very frequent floods |
| url | http://www.sciencedirect.com/science/article/pii/S2214581823000940 |
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