The role of soil pipe and pipeflow in headcut migration processes in loessic soils
文献类型：期刊论文
| 作者 | Xu, Ximeng1,2,3; Wilson, Glenn V.3; Zheng, Fenli1; Tang, Qiuhong2
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| 刊名 | EARTH SURFACE PROCESSES AND LANDFORMS
 |
| 出版日期 | 2020-06-30 |
| 卷号 | 45期号:8页码:1749-1763 |
| 关键词 | subsurface erosion seepage concentrated flow piping gully erosion soil erosion |
| ISSN号 | 0197-9337 |
| DOI | 10.1002/esp.4843 |
| 通讯作者 | Zheng, Fenli(flzh@ms.iswc.ac.cn) |
| 英文摘要 | Headcut formation and migration was sometimes mistaken as the result of overland flow, without realizing that the headcut was formed and being influenced by flow through soil pipes into the headcut. To determine the effects of the soil pipe and flow through a soil pipe on headcut migration in loessic soils, laboratory experiments were conducted under free drainage conditions and conditions of a perched water table. Soil beds with a 3-cm deep initial headcut were formed in a flume with a 1.5-cm diameter soil pipe 15 cm below the bed surface. Overland flow and flow into the soil pipe was applied at a constant rate of 68 and 1 l min(-1)at the upper end of the flume. The headcut migration rate and sediment concentrations in both surface (channel) and subsurface (soil pipe) flows were measured with time. The typical response was the formation of a headcut that extended in depth until an equilibrium scour hole was established, at which time the headcut migrated upslope. Pipeflow caused erosion inside the soil pipe at the same time that runoff was causing a scour hole to deepen and migrate. When the headcut extended to the depth of the soil pipe, surface runoff entering the scour hole interacted with flow from the soil pipe also entering the scour hole. This interaction dramatically altered the headcut processes and greatly accelerated the headcut migration rates and sediment concentrations. Conditions in which a perched water table provided seepage into the soil pipe, in addition to pipeflow, increased the sediment concentration by 42% and the headcut migration rate by 47% compared with pipeflow under free drainage conditions. The time that overland flow converged with subsurface flow was advanced under seepage conditions by 2.3 and 5.0 min compared with free drainage conditions. This study confirmed that pipeflow dramatically accelerates headcut migration, especially under conditions of shallow perched water tables, and highlights the importance of understanding these processes in headcut migration processes. (c) 2020 John Wiley & Sons, Ltd. |
| WOS关键词 | EPHEMERAL GULLY EROSION ; INTERNAL EROSION ; MIDALTITUDE MOUNTAINS ; SUBSURFACE EROSION ; TEMPERATE CLIMATE ; RILL EROSION ; FLOW-THROUGH ; SEEPAGE ; WATER ; HILLSLOPES |
| WOS研究方向 | Physical Geography ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000540134800005 |
| 出版者 | WILEY |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/162168]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Zheng, Fenli |
| 作者单位 | 1.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, 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 3.USDA ARS, Natl Sedimentat Lab, Oxford, MS 38655 USA |
| 推荐引用方式 GB/T 7714 | Xu, Ximeng,Wilson, Glenn V.,Zheng, Fenli,et al. The role of soil pipe and pipeflow in headcut migration processes in loessic soils[J]. EARTH SURFACE PROCESSES AND LANDFORMS,2020,45(8):1749-1763. |
| APA | Xu, Ximeng,Wilson, Glenn V.,Zheng, Fenli,&Tang, Qiuhong.(2020).The role of soil pipe and pipeflow in headcut migration processes in loessic soils.EARTH SURFACE PROCESSES AND LANDFORMS,45(8),1749-1763. |
| MLA | Xu, Ximeng,et al."The role of soil pipe and pipeflow in headcut migration processes in loessic soils".EARTH SURFACE PROCESSES AND LANDFORMS 45.8(2020):1749-1763. |
入库方式： OAI收割
来源：地理科学与资源研究所
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