How climate-induced wetting-drying cycles contribute to gully erosion: A case study from southern China
文献类型：期刊论文
| 作者 | Liu, Xinyu3; Zhang, Xianwei4; Gao, Haodong1; Wang, Gang4,5; Zhang, Shixing2 |
| 刊名 | CATENA
 |
| 出版日期 | 2023-11-01 |
| 卷号 | 232页码:13 |
| 关键词 | Gully erosion Granite residual soil Wetting -drying cycle Disintegration Microstructure Fissure |
| ISSN号 | 0341-8162 |
| DOI | 10.1016/j.catena.2023.107444 |
| 英文摘要 | Collapsing gully erosion developed upon granite residual soil is the most devastating form of soil erosion in southern China. However, despite extensive investigations of the controlling factors of gully erosion, including granite regolith properties (pedon scale), slope geometry and hydraulic conditions (watershed scale), and local climate (regional scale), little is known about the interrelationships among these three-level factors and how these contribute to the initiation of gully erosion. This study presents how the wetting-drying cycles induced by the subtropical climate in southern China alter the properties of granite residual soil, with particular focus on the soil disintegration behavior. The test results indicate a finer texture (clay content increasing by 218%), lower shear strength (effective cohesion and internal frictional angle decreasing 55% and 30%, respectively), and five-times higher permeability for soil subjected to eight wetting-drying cycles. In addition, the wetting-drying cycle triggers more-apparent disintegration behavior, with the disintegration rate improving by 7 times. Such alterations are found to be caused by microstructural alterations including deaggregation and crack initiation, as revealed via scanning electron microscopy and mercury intrusion porosimetry. The implications of the variations of the multilevel soil properties for the development of gully erosion are discussed, with the degraded soil properties lowering the resistance to erosion and the high permeability facilitating soil-water interactions. This study improves the understanding of gully erosion and provides effective technical suggestions. |
| 资助项目 | Key R amp; D project of Hubei Province[2021BAA186] ; Youth Innovation Promotion As-sociation CAS[2018363] ; [SKLGP2023K011] |
| WOS研究方向 | Geology ; Agriculture ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:001063025100001 |
| 出版者 | ELSEVIER |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/39362]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Zhang, Xianwei |
| 作者单位 | 1.Wuhan Univ Sci & Technol, Coll Urban Construction, Wuhan 430065, Peoples R China 2.Dalian Univ Technol, State Key Lab Coastal & Offshore Engn, Dalian 116024, Peoples R China 3.Huazhong Univ Sci & Technol, Sch Civil & Hydraul Engn, Wuhan 430074, Peoples R China 4.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Xinyu,Zhang, Xianwei,Gao, Haodong,et al. How climate-induced wetting-drying cycles contribute to gully erosion: A case study from southern China[J]. CATENA,2023,232:13. |
| APA | Liu, Xinyu,Zhang, Xianwei,Gao, Haodong,Wang, Gang,&Zhang, Shixing.(2023).How climate-induced wetting-drying cycles contribute to gully erosion: A case study from southern China.CATENA,232,13. |
| MLA | Liu, Xinyu,et al."How climate-induced wetting-drying cycles contribute to gully erosion: A case study from southern China".CATENA 232(2023):13. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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