Impact of an Extreme Typhoon Event on Subsequent Sediment Discharges and Rainfall-Driven Landslides in Affected Mountainous Regions of Taiwan
Fluctuations in the sediment yielding rate within mountainous areas are found after extreme precipitations. These changes are associated with rainfall-driven landslides and can be evaluated through observations of sediment transported in river water. In this study, we assess the differential impact...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2018/8126518 |
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| author | Ching Hung Guan-Wei Lin Hsien-Li Kuo Jia-Ming Zhang Chi-Wen Chen Hongey Chen |
| author_facet | Ching Hung Guan-Wei Lin Hsien-Li Kuo Jia-Ming Zhang Chi-Wen Chen Hongey Chen |
| author_sort | Ching Hung |
| collection | DOAJ |
| description | Fluctuations in the sediment yielding rate within mountainous areas are found after extreme precipitations. These changes are associated with rainfall-driven landslides and can be evaluated through observations of sediment transported in river water. In this study, we assess the differential impact level and duration of an extreme rainfall event caused by the 2009 Typhoon Morakot in Taiwan. Using a time series of suspended sediment data and landslide inventories within three affected catchments, our results found that the proportion of the typhoon-generated sediment discharges reached 58% of the 2009 annual sediment discharges, and the annual sediment discharges could be 15-fold higher than the average annual sediment discharges prior to the typhoon. The impact of the typhoon on suspended sediment discharge lasted for around four months. It is further revealed that a significant increase in the number of landslides was attributed to the impact of the extreme typhoon event, and the critical rainfall condition triggering landslides, based on the relationship between rainfall and landslide number and the rainfall intensity-duration thresholds, declined for 4–5 years. |
| format | Article |
| id | doaj-art-ab9d1dc6b2da4b548fbd2205dea48ed7 |
| institution | OA Journals |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-ab9d1dc6b2da4b548fbd2205dea48ed72025-08-20T02:20:12ZengWileyGeofluids1468-81151468-81232018-01-01201810.1155/2018/81265188126518Impact of an Extreme Typhoon Event on Subsequent Sediment Discharges and Rainfall-Driven Landslides in Affected Mountainous Regions of TaiwanChing Hung0Guan-Wei Lin1Hsien-Li Kuo2Jia-Ming Zhang3Chi-Wen Chen4Hongey Chen5Department of Civil Engineering, National Cheng Kung University, No. 1, University Road, Tainan City 70101, TaiwanDepartment of Earth Sciences, National Cheng Kung University, No. 1, University Road, Tainan City 70101, TaiwanDepartment of Earth Sciences, National Cheng Kung University, No. 1, University Road, Tainan City 70101, TaiwanDepartment of Earth Sciences, National Cheng Kung University, No. 1, University Road, Tainan City 70101, TaiwanNational Science and Technology Center for Disaster Reduction, No. 200, Sec. 3, Beixin Road, Xindian District, New Taipei City, TaiwanNational Science and Technology Center for Disaster Reduction, No. 200, Sec. 3, Beixin Road, Xindian District, New Taipei City, TaiwanFluctuations in the sediment yielding rate within mountainous areas are found after extreme precipitations. These changes are associated with rainfall-driven landslides and can be evaluated through observations of sediment transported in river water. In this study, we assess the differential impact level and duration of an extreme rainfall event caused by the 2009 Typhoon Morakot in Taiwan. Using a time series of suspended sediment data and landslide inventories within three affected catchments, our results found that the proportion of the typhoon-generated sediment discharges reached 58% of the 2009 annual sediment discharges, and the annual sediment discharges could be 15-fold higher than the average annual sediment discharges prior to the typhoon. The impact of the typhoon on suspended sediment discharge lasted for around four months. It is further revealed that a significant increase in the number of landslides was attributed to the impact of the extreme typhoon event, and the critical rainfall condition triggering landslides, based on the relationship between rainfall and landslide number and the rainfall intensity-duration thresholds, declined for 4–5 years.http://dx.doi.org/10.1155/2018/8126518 |
| spellingShingle | Ching Hung Guan-Wei Lin Hsien-Li Kuo Jia-Ming Zhang Chi-Wen Chen Hongey Chen Impact of an Extreme Typhoon Event on Subsequent Sediment Discharges and Rainfall-Driven Landslides in Affected Mountainous Regions of Taiwan Geofluids |
| title | Impact of an Extreme Typhoon Event on Subsequent Sediment Discharges and Rainfall-Driven Landslides in Affected Mountainous Regions of Taiwan |
| title_full | Impact of an Extreme Typhoon Event on Subsequent Sediment Discharges and Rainfall-Driven Landslides in Affected Mountainous Regions of Taiwan |
| title_fullStr | Impact of an Extreme Typhoon Event on Subsequent Sediment Discharges and Rainfall-Driven Landslides in Affected Mountainous Regions of Taiwan |
| title_full_unstemmed | Impact of an Extreme Typhoon Event on Subsequent Sediment Discharges and Rainfall-Driven Landslides in Affected Mountainous Regions of Taiwan |
| title_short | Impact of an Extreme Typhoon Event on Subsequent Sediment Discharges and Rainfall-Driven Landslides in Affected Mountainous Regions of Taiwan |
| title_sort | impact of an extreme typhoon event on subsequent sediment discharges and rainfall driven landslides in affected mountainous regions of taiwan |
| url | http://dx.doi.org/10.1155/2018/8126518 |
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