Impact of Spatial Distribution Methods for Rainfall on Flash Floods Modelling Using a Hydrodynamic Model
ABSTRACT In small mountain catchments, the spatial and temporal resolution of rainfall can vary significantly across the catchment. However, rainfall gauging stations can be sparse in these regions, and collected data may not reflect the real rainfall distribution across the catchment. When modellin...
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| Format: | Article |
| Language: | English |
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Wiley
2025-03-01
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| Series: | Journal of Flood Risk Management |
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| Online Access: | https://doi.org/10.1111/jfr3.70010 |
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| author | Nan Sun Wei Huang Maggie Creed Xihuan Sun |
| author_facet | Nan Sun Wei Huang Maggie Creed Xihuan Sun |
| author_sort | Nan Sun |
| collection | DOAJ |
| description | ABSTRACT In small mountain catchments, the spatial and temporal resolution of rainfall can vary significantly across the catchment. However, rainfall gauging stations can be sparse in these regions, and collected data may not reflect the real rainfall distribution across the catchment. When modelling flash floods, finding a suitable approach to estimate the actual rainfall distribution is nontrivial. In this study, the effectiveness of different methods for obtaining a spatial and temporal rainfall distribution for use in numerical modelling of flash floods was investigated using a full two‐dimensional depth‐averaged shallow‐water hydrodynamic model. It was demonstrated that the Thiessen polygon method and the inverse distance weighted interpolation method (IDW), with appropriate empirical coefficients, produce results in agreement with observed stage and discharge hydrographs. We show that the uniform distribution method cannot be used to represent realistic spatial and temporal variability of rainfall for flash flood events in small mountain catchments. By combining available data with the common IDW method, missing rainfall timeseries data in a small catchment can be estimated, even for short‐duration time scales, such as a single flash flood event. |
| format | Article |
| id | doaj-art-83c50bed0cb2431581f9b32fe3ca57a6 |
| institution | Kabale University |
| issn | 1753-318X |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Flood Risk Management |
| spelling | doaj-art-83c50bed0cb2431581f9b32fe3ca57a62025-08-20T03:44:06ZengWileyJournal of Flood Risk Management1753-318X2025-03-01181n/an/a10.1111/jfr3.70010Impact of Spatial Distribution Methods for Rainfall on Flash Floods Modelling Using a Hydrodynamic ModelNan Sun0Wei Huang1Maggie Creed2Xihuan Sun3Taiyuan University of Technology Taiyuan ChinaChangjiang River Scientific Research Institute Wuhan ChinaJames Watt School of Engineering University of Glasgow Glasgow UKTaiyuan University of Technology Taiyuan ChinaABSTRACT In small mountain catchments, the spatial and temporal resolution of rainfall can vary significantly across the catchment. However, rainfall gauging stations can be sparse in these regions, and collected data may not reflect the real rainfall distribution across the catchment. When modelling flash floods, finding a suitable approach to estimate the actual rainfall distribution is nontrivial. In this study, the effectiveness of different methods for obtaining a spatial and temporal rainfall distribution for use in numerical modelling of flash floods was investigated using a full two‐dimensional depth‐averaged shallow‐water hydrodynamic model. It was demonstrated that the Thiessen polygon method and the inverse distance weighted interpolation method (IDW), with appropriate empirical coefficients, produce results in agreement with observed stage and discharge hydrographs. We show that the uniform distribution method cannot be used to represent realistic spatial and temporal variability of rainfall for flash flood events in small mountain catchments. By combining available data with the common IDW method, missing rainfall timeseries data in a small catchment can be estimated, even for short‐duration time scales, such as a single flash flood event.https://doi.org/10.1111/jfr3.70010estimation of missing rainfall datafull hydrodynamic modelrainfall distribution methodsrainfall‐triggered flash floods |
| spellingShingle | Nan Sun Wei Huang Maggie Creed Xihuan Sun Impact of Spatial Distribution Methods for Rainfall on Flash Floods Modelling Using a Hydrodynamic Model Journal of Flood Risk Management estimation of missing rainfall data full hydrodynamic model rainfall distribution methods rainfall‐triggered flash floods |
| title | Impact of Spatial Distribution Methods for Rainfall on Flash Floods Modelling Using a Hydrodynamic Model |
| title_full | Impact of Spatial Distribution Methods for Rainfall on Flash Floods Modelling Using a Hydrodynamic Model |
| title_fullStr | Impact of Spatial Distribution Methods for Rainfall on Flash Floods Modelling Using a Hydrodynamic Model |
| title_full_unstemmed | Impact of Spatial Distribution Methods for Rainfall on Flash Floods Modelling Using a Hydrodynamic Model |
| title_short | Impact of Spatial Distribution Methods for Rainfall on Flash Floods Modelling Using a Hydrodynamic Model |
| title_sort | impact of spatial distribution methods for rainfall on flash floods modelling using a hydrodynamic model |
| topic | estimation of missing rainfall data full hydrodynamic model rainfall distribution methods rainfall‐triggered flash floods |
| url | https://doi.org/10.1111/jfr3.70010 |
| work_keys_str_mv | AT nansun impactofspatialdistributionmethodsforrainfallonflashfloodsmodellingusingahydrodynamicmodel AT weihuang impactofspatialdistributionmethodsforrainfallonflashfloodsmodellingusingahydrodynamicmodel AT maggiecreed impactofspatialdistributionmethodsforrainfallonflashfloodsmodellingusingahydrodynamicmodel AT xihuansun impactofspatialdistributionmethodsforrainfallonflashfloodsmodellingusingahydrodynamicmodel |