Climate Change Data Portal
| DOI | 10.1016/j.catena.2024.107890 |
| Characteristics and dynamic mechanism of rill erosion driven by extreme rainfall on karst plateau slopes, SW China | |
| Yan, Youjin; Tu, Na; Cen, Longpei; Gan, Fengling; Dai, Quanhou; Mei, Lina | |
| 发表日期 | 2024 |
| ISSN | 0341-8162 |
| EISSN | 1872-6887 |
| 起始页码 | 238 |
| 卷号 | 238 |
| 英文摘要 | Driven by climate change and increased human activities, the frequency and intensity of extreme rainfall events are increasing, leading to increased risk of water erosion on slopes in karst rocky desertification (KRD) areas. However, the driving factors (rainfall intensity, slope gradient, and the degree of underground fissure pore), characteristics, and dynamic mechanisms of rill erosion on KRD slopes under extreme rainfall have received limited attention. A rainfall simulation experiment was performed to investigate the driving factors of rill erosion on KRD slopes under extreme rainfall events. The experiments were conducted using an erosion flume (4 m long, 1.5 m wide and 0.35 m deep) with five rainfall intensities (50, 105, 115, 125 and 145 mmh(-1)), three-level slope gradients (5 degrees, 15 degrees and 25 degrees), and three typical degrees of underground pore fissure (1 %, 3 % and 5 %). The results showed that extreme rainfall significantly stimulated the formation and development of rill erosion on KRD slopes. In particular, rainfall intensity and slope gradient significantly affected rill erosion (p < 0.05), whereas the degree of underground pore fissure did not have any distinct effect. Increasing rainfall intensity intensified rill erosion by significantly (p < 0.05) promoting the rill density, total rill surface area, and longest of rill length. With increasing slope gradient, the rill density, rill distribution density, and average rill depth significantly increased (p < 0.05). Moreover, extreme rainfall events exacerbated surface soil erosion by enhancing the hydrodynamic characteristics of slope runoff. Rill erosion was most sensitive to the shear stress of runoff, and rill density was found to be the most suitable rill index for describing surface soil erosion on the slope under extreme rainfall. The findings provide valuable insights into the characteristics and mechanisms of soil erosion in karst regions under future climate warming. |
| 英文关键词 | Rill erosion; Extreme rainfall; Hydrodynamic characteristic; Dynamic mechanism; Karst rocky desertification |
| 语种 | 英语 |
| WOS研究方向 | Geology ; Agriculture ; Water Resources |
| WOS类目 | Geosciences, Multidisciplinary ; Soil Science ; Water Resources |
| WOS记录号 | WOS:001198046500001 |
| 来源期刊 | CATENA
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/304631 |
| 作者单位 | Nanjing Forestry University; Guizhou University; Guizhou University; Chongqing Normal University |
| 推荐引用方式 GB/T 7714 | Yan, Youjin,Tu, Na,Cen, Longpei,et al. Characteristics and dynamic mechanism of rill erosion driven by extreme rainfall on karst plateau slopes, SW China[J],2024,238. |
| APA | Yan, Youjin,Tu, Na,Cen, Longpei,Gan, Fengling,Dai, Quanhou,&Mei, Lina.(2024).Characteristics and dynamic mechanism of rill erosion driven by extreme rainfall on karst plateau slopes, SW China.CATENA,238. |
| MLA | Yan, Youjin,et al."Characteristics and dynamic mechanism of rill erosion driven by extreme rainfall on karst plateau slopes, SW China".CATENA 238(2024). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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