Processes and controls of regional floods over eastern China
<p>Mounting evidence points to elevated regional flood hazards in a changing climate, but existing knowledge about their processes and controls is limited. This is partially attributed to inadequate characterizations of the spatial extent and potential drivers of these floods. Here we develop...
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| Language: | English |
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Copernicus Publications
2024-11-01
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| Series: | Hydrology and Earth System Sciences |
| Online Access: | https://hess.copernicus.org/articles/28/4883/2024/hess-28-4883-2024.pdf |
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| author | Y. Yang Y. Yang L. Yang L. Yang J. Zhang J. Zhang Q. Wang Q. Wang |
| author_facet | Y. Yang Y. Yang L. Yang L. Yang J. Zhang J. Zhang Q. Wang Q. Wang |
| author_sort | Y. Yang |
| collection | DOAJ |
| description | <p>Mounting evidence points to elevated regional flood hazards in a changing climate, but existing knowledge about their processes and controls is limited. This is partially attributed to inadequate characterizations of the spatial extent and potential drivers of these floods. Here we develop a machine-learning-based framework (mainly including the Density Based Spatial Clustering Applications with Noise (DBSCAN) clustering algorithm and a conditional random forest model) to examine the processes and controls of regional floods over eastern China. Our empirical analyses are based on a dense network of stream gauging stations with continuous observations of annual maximum flood peaks (i.e. magnitude and timing) during the period 1980–2017. A comprehensive catalogue of 318 regional floods is developed. We reveal a pronounced clustering of regional floods in both space and time over eastern China. This is dictated by cyclonic precipitating systems and/or their interactions with topography. We highlight contrasting behaviours of regional floods in terms of their spatial extents and intensities. These contrasts are determined by fine-scale structures of flood-producing storms and anomalous soil moisture. While land surface properties might play a role in basin-scale flood processes, it is more critical to capture spatial–temporal rainfall variabilities and soil moisture anomalies for reliable large-scale flood hazard modelling and impact assessments. Our analyses contribute to flood science by better characterizing the spatial dimension of flood hazards and can serve as a basis for collaborative flood risk management in a changing climate.</p> |
| format | Article |
| id | doaj-art-5c863d8b4c6f43119927d7e7055593de |
| institution | Kabale University |
| issn | 1027-5606 1607-7938 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Hydrology and Earth System Sciences |
| spelling | doaj-art-5c863d8b4c6f43119927d7e7055593de2024-11-15T07:09:08ZengCopernicus PublicationsHydrology and Earth System Sciences1027-56061607-79382024-11-01284883490210.5194/hess-28-4883-2024Processes and controls of regional floods over eastern ChinaY. Yang0Y. Yang1L. Yang2L. Yang3J. Zhang4J. Zhang5Q. Wang6Q. Wang7School of Geography and Ocean Science, Nanjing University, Nanjing, ChinaFrontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, ChinaSchool of Geography and Ocean Science, Nanjing University, Nanjing, ChinaFrontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, ChinaSchool of Geography and Ocean Science, Nanjing University, Nanjing, ChinaFrontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, ChinaSchool of Geography and Ocean Science, Nanjing University, Nanjing, ChinaFrontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, China<p>Mounting evidence points to elevated regional flood hazards in a changing climate, but existing knowledge about their processes and controls is limited. This is partially attributed to inadequate characterizations of the spatial extent and potential drivers of these floods. Here we develop a machine-learning-based framework (mainly including the Density Based Spatial Clustering Applications with Noise (DBSCAN) clustering algorithm and a conditional random forest model) to examine the processes and controls of regional floods over eastern China. Our empirical analyses are based on a dense network of stream gauging stations with continuous observations of annual maximum flood peaks (i.e. magnitude and timing) during the period 1980–2017. A comprehensive catalogue of 318 regional floods is developed. We reveal a pronounced clustering of regional floods in both space and time over eastern China. This is dictated by cyclonic precipitating systems and/or their interactions with topography. We highlight contrasting behaviours of regional floods in terms of their spatial extents and intensities. These contrasts are determined by fine-scale structures of flood-producing storms and anomalous soil moisture. While land surface properties might play a role in basin-scale flood processes, it is more critical to capture spatial–temporal rainfall variabilities and soil moisture anomalies for reliable large-scale flood hazard modelling and impact assessments. Our analyses contribute to flood science by better characterizing the spatial dimension of flood hazards and can serve as a basis for collaborative flood risk management in a changing climate.</p>https://hess.copernicus.org/articles/28/4883/2024/hess-28-4883-2024.pdf |
| spellingShingle | Y. Yang Y. Yang L. Yang L. Yang J. Zhang J. Zhang Q. Wang Q. Wang Processes and controls of regional floods over eastern China Hydrology and Earth System Sciences |
| title | Processes and controls of regional floods over eastern China |
| title_full | Processes and controls of regional floods over eastern China |
| title_fullStr | Processes and controls of regional floods over eastern China |
| title_full_unstemmed | Processes and controls of regional floods over eastern China |
| title_short | Processes and controls of regional floods over eastern China |
| title_sort | processes and controls of regional floods over eastern china |
| url | https://hess.copernicus.org/articles/28/4883/2024/hess-28-4883-2024.pdf |
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