| Unique landslides (loess slide-flows) induced by an extreme rainstorm in 2018 on the Loess Plateau: A new geological hazard and erosion process |
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| 作者姓名： | Li Luo Wen-Zhao Guo Pei Tian Yi-li Liu Shao-Kun Wang Jia-Wei Luo |
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| 作者单位： | 1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau/College of Water Resources and Architectural Engineering, Northwest Agriculture and Forestry University;2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology;3. Key Laboratory for Geographical Process Analysis & Simulation of Hubei Province, Central China Normal University |
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| 基金项目： | funded by the National Natural Science Foundation of China (Grant Nos. 41907057 and 41907061)；;the China Postdoctoral Science Foundation (Grant No. 2020M683591)；;the Natural Science Basic Research Program of Shaanxi Province (Grant No. 2021JQ-165)；;the Research Program from the State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau (A314021402-2005)；;Natural Science Foundation of Hubei province, China (Grant No. 2021CFB550)； |
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| 摘 要： | Currently, the vegetation has recovered well in most areas of the Loess Plateau in China, and soil erosion has significantly decreased. However, the heavy rainfall event in July 2018 triggered many instances of a unique type of loess landslides(i.e., slide-flows) on the gully-slopes with vegetation recovery in the Nanxiaohegou Basin on the Loess Plateau. This rainfall event was unusual and was a persistent heavy rainfall. The accumulated rainfall from 24 June to 10 July was 232.2 mm, which compr...
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| 收稿时间： | 15 February 2022 |
Unique landslides (loess slide-flows) induced by an extreme rainstorm in 2018 on the Loess Plateau: A new geological hazard and erosion process |
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| Li Luo,Wen-Zhao Guo,Pei Tian,Yi-li Liu,Shao-Kun Wang,Jia-Wei Luo.Unique landslides (loess slide-flows) induced by an extreme rainstorm in 2018 on the Loess Plateau: A new geological hazard and erosion process[J].International Journal of Sediment Research,2023,38(2):228-239. |
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| Institution: | 1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau/College of Water Resources and Architectural Engineering, Northwest Agriculture and Forestry University, Yangling, 712100, China;2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, 610059, China;3. Key Laboratory for Geographical Process Analysis & Simulation of Hubei Province, Central China Normal University, Wuhan, 430079, China |
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| Abstract: | Currently, the vegetation has recovered well in most areas of the Loess Plateau in China, and soil erosion has significantly decreased. However, the heavy rainfall event in July 2018 triggered many instances of a unique type of loess landslides (i.e., slide-flows) on the gully-slopes with vegetation recovery in the Nanxiaohegou Basin on the Loess Plateau. This rainfall event was unusual and was a persistent heavy rainfall. The accumulated rainfall from 24 June to 10 July was 232.2 mm, which comprised 42% of the mean annual rainfall. A loess slide-flow is characterized by combining two movement types of the slide and flow. The loess slide-flows first slide on the gully-slopes and then turn into long run-out earthflows moving downstream, delivering vast amounts of sediment to the river. The average landslide erosion rates were 110.8–134.9 kg/m2. These loess slide-flows generally did not occur individually but in groups, which were characterized by large numbers, high density, small scale, and shallow depth. The changes of vegetation characteristics and soil characteristics both had a significant impact on the scale of the landslides. Grass with high coverage had an adverse effect on the occurrence of shallow landslides. The adverse hydrological effects of the plant may offset the weak root reinforcement. Loess slide-flows have become a new geological hazard and erosion process on the Loess Plateau. Loess slide-flows are a prominent ecological and environmental problem after vegetation restoration, and more attention should be paid to loess slide-flows in the future. |
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| Keywords: | Loess plateau Landslide Soil erosion Vegetation Rainfall |
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