KMS Institute of soil and water conservation Chinese Academy of Sciences
| A simulation of rill bed incision processes in upland concentrated flows | |
| Chao Qin1,2; Fenli Zheng1,3; Xunchang J. Zhang5; Ximeng Xu1,2; Gang Liu1,3; Zheng, FL (reprint author), Inst Soil & Water Conservat, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China. | |
| 文章类型 | Article |
| 2018 | |
| 发表期刊 | CATENA
 |
| ISSN | 0341-8162 |
| 通讯作者邮箱 | glginchao@nwsuaf.edu.cn ; flzh@ms.iswc.ac.cn ; john.zhang@ars.usda.gov ; xuxm@nwsuaf.edu.cn |
| 卷号 | 165页码:310-319 |
| 摘要 | Quantifying rill bed incision provides fundamental information for process-based erosion modeling; while the morphodynamic and hydrodynamic mechanism in bed incision processes are still unclear. Thus, experiments were conducted to examine rill bed incision processes in upland concentrated flows. DEMs (2 mm x 2 mm resolution) obtained by photogrammetry were used for sill bed morphology analysis. Rill channel (2.0 m-long, 0.08 m-wide and 0.15 m-deep) with two slope gradients (15 degrees and 20 degrees) were subjected to four overland flow rates (1.0, 2.0, 3.0 and 4.0 L min(-1)). The results showed that sediment delivery, rill bed incision rate and average rill depth increased with inflow rate and bed slope. Sediment delivery increased from 0.060 to 0.226 kg min(-1) per 1 L min(-1) inflow increment and from 0.043 to 0.207 kg min(-1) when bed slope increased from 15 degrees to 20 degrees. In a well-developed rill channel, rill bed incision could be divided into three phases: pre-headcut formation (dominated by rill flow shear stress), headcut incision (dominated by headcut advancing) and post-headcut incision (dominated by rill flow shear stress). Headcut incision phase, which only accounted for < 15% of total experimental time, produced > 65% of rill bed sediment. In the pre-headcut formation phase, rill flow velocity, shear stress and stream power increased with increases of inflow rate and slope gradient. Conversely, flow velocity showed no evident trend with increased inflow rate and bed slope during headcut incision phase. Initial headcut advancing rate could be predicted by a non-linear function based upon soil characteristics, rill flow shear stress and headcut height. Sediment delivery showed a power function with the product of inflow rate and squared bed slope. Because rill bed incision is dominated by headcut advancement and incision, practices for controlling headcut initiation should be implemented to decrease hillslope soil loss. |
| 关键词 | Soil Erosion Rill Bed Incision Headcut Photogrammetry |
| 学科领域 | Geology ; Agriculture ; Water Resources |
| DOI | 10.1016/j.catena.2018.02.013 |
| 收录类别 | SCI |
| 出版地 | PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS |
| 语种 | 英语 |
| WOS记录号 | WOS:000430994900031 |
| 出版者 | ELSEVIER SCIENCE BV |
| 项目资助者 | International Partnership Program of Chinese Academy of Sciences [161461KYSB20170013] ; International Partnership Program of Chinese Academy of Sciences [161461KYSB20170013] ; National Natural Science Foundation of China [41761144060] ; National Natural Science Foundation of China [41761144060] ; MWR Key Laboratory of Soil and Water Loss Process and Control in the Loess Plateau [2017001] ; MWR Key Laboratory of Soil and Water Loss Process and Control in the Loess Plateau [2017001] ; China Scholarship Council ; China Scholarship Council |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | sbir.nwafu.edu.cn/handle/361005/8241 |
| 专题 | 水保所科研产出--SCI_2018--SCI |
| 通讯作者 | Zheng, FL (reprint author), Inst Soil & Water Conservat, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China. |
| 作者单位 | 1.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loes, Yangling 712100, Shaanxi, Peoples R China 2.Univ Mississippi, Natl Ctr Computat Hydrosci & Engn, Oxford, MS 38655 USA 3.Chinese Acad Sci, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 4.MWR, Yangling 712100, Shaanxi, Peoples R China 5.USDA ARS, Grazinglands Res Lab, El Reno, OK 73036 USA |
| 推荐引用方式 GB/T 7714 | Chao Qin,Fenli Zheng,Xunchang J. Zhang,et al. A simulation of rill bed incision processes in upland concentrated flows[J]. CATENA,2018,165:310-319. |
| APA | Chao Qin,Fenli Zheng,Xunchang J. Zhang,Ximeng Xu,Gang Liu,&Zheng, FL .(2018).A simulation of rill bed incision processes in upland concentrated flows.CATENA,165,310-319. |
| MLA | Chao Qin,et al."A simulation of rill bed incision processes in upland concentrated flows".CATENA 165(2018):310-319. |
| 条目包含的文件 | 下载所有文件 | |||||
| 文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
| 2-73.pdf（1700KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 下载 | |
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
修改评论