Measurements and estimation of flow velocity in mobile bed rills
文献类型：期刊论文
| 作者 | Ban, Yunyun1,2 |
| 刊名 | INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH
 |
| 出版日期 | 2023-02-01 |
| 卷号 | 38期号:1页码:97-104 |
| 关键词 | Flow velocity Flow rate Slope gradient Model fitting Slope morphology |
| ISSN号 | 1001-6279 |
| DOI | 10.1016/j.ijsrc.2022.07.003 |
| 通讯作者 | Ban, Yunyun(banyy@igsnrr.ac.cn) |
| 英文摘要 | Rills are primary sediment sources and hillslope water/sediment runoff transport channels. Water flow velocities in rills are easily affected by bed condition over eroding and non-eroding slopes, which is an important hydrodynamic process in soil erosion research. This research is done to demonstrate the poorly understood "feedback mechanism" related to slope independence of flow velocity to slope gradient. A series of experiments were done on silt loam soil slopes to measure water flow velocity in rills under nine unit width flow rates (q) (0.17 x 10-3, 0.33 x 10-3, 0.67 x 10-3, 1.33 x 10-3, 2.67 x 10-3, 5.33 x 10-3,10.67 x 10-3, 21.33 x 10-3, and 42.67 x 10-3 m3/(s$m)) combined with four slope gradients (8.7%, 17.6%, 26.8%, and 36.4%), in which mobile bed rills were monitored. For unit flow velocity under q < 1.33 x 10-3 m2/s, independence of flow velocity to slope was obtained. However, the results indicated that slope gradient combined with a higher unit flow rate contributed to better velocity prediction and fitted with a segmented equation well (R2 = 0.95). A feedback mechanism was able to verify that the increase in roughness directly dissipated flow energy to reduce flow velocity, but cannot completely counterbalances steep slope effect. The experimental results showed that erosion-caused morphological changes on soil slopes reduce flow velocity by half due to an increase in bed rough-ness. Therefore, the current experimental measurements considering a wide range of flow rate and slope gradient conditions is useful to reveal the steep slope effect in mobile bed rills. The analysis showed that, for the investigated conditions, the flow velocity is a slope gradient-and flow rate -dependent parameter.(c) 2022 International Research and Training Centre on Erosion and Sedimentation/the World Association for Sedimentation and Erosion Research. Published by Elsevier B.V. All rights reserved. |
| WOS关键词 | WATER-FLOW ; RESISTANCE EQUATION ; SOIL-EROSION ; BLACK SOIL ; ROUGHNESS ; SEDIMENT ; SLOPES ; FROZEN ; HYDRAULICS ; TRANSPORT |
| 资助项目 | National Natural Science Foundation of China ; [42007060] ; [41230746] |
| WOS研究方向 | Environmental Sciences & Ecology ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000887232000008 |
| 出版者 | IRTCES |
| 资助机构 | National Natural Science Foundation of China |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/187678]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Ban, Yunyun |
| 作者单位 | 1.China Agr Univ, Beijing 100083, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ban, Yunyun. Measurements and estimation of flow velocity in mobile bed rills[J]. INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH,2023,38(1):97-104. |
| APA | Ban, Yunyun.(2023).Measurements and estimation of flow velocity in mobile bed rills.INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH,38(1),97-104. |
| MLA | Ban, Yunyun."Measurements and estimation of flow velocity in mobile bed rills".INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH 38.1(2023):97-104. |
入库方式： OAI收割
来源：地理科学与资源研究所
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