Spatial scale effects on sediment concentration in runoff during flood events for hilly areas of the Loess Plateau, China
文献类型：SCI/SSCI论文
| 作者 | Zheng M. G. ; Qin F. ; Sun L. Y. ; Qi D. L. ; Cai Q. G. |
| 发表日期 | 2011 |
| 关键词 | spatial scale hyperconcentrated flow sediment yield soil erosion flood events Loess Plateau hyperconcentrated flow debris flow yield variability delivery problem soil-erosion basin river transition transport volcano |
| 英文摘要 | The spatial scale effect on sediment concentration in runoff has received little attention despite numerous studies on sediment yield or sediment delivery ratio in the context of multiple spatial scales. We have addressed this issue for hilly areas of the Loess Plateau, north China where fluvial processes are mainly dominated by hyperconcentrated flows. The data on 717 flow events observed at 17 gauging stations and two runoff experimental plots, all located in the 3906km(2) Dalihe watershed, are presented. The combination of the downstream scour of hyperconcentrated flows and the downstream dilution, which is mainly caused by the base flow and is strengthened as a result of the strong patchy storms, determines the spatial change of sediment concentration in runoff during flood events. At the watershed scale, the scouring effect takes predominance first but is subordinate to the downstream dilution with a further increase in spatial scale. As a result, the event mean sediment concentration first increases following a power function with drainage basin area and then declines at the drainage basin area of about 700 km(2). The power function in combination with the proportional model of the runoff-sediment yield relationship we proposed before was used to establish the sediment-yield model, which is neither the physical-based model nor the regression model. This model, with only two variables (runoff depth and drainage basin area) and two parameters, can provide fairly accurate prediction of event sediment yield with model efficiency over 0.95 if small events with runoff depth lower than 1 mm are excluded. Copyright (c) 2011 John Wiley & Sons, Ltd. |
| 出处 | Earth Surface Processes and Landforms |
| 卷 | 36 |
| 期 | 11 |
| 页 | 1499-1509 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0197-9337 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/22253]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Zheng M. G.,Qin F.,Sun L. Y.,et al. Spatial scale effects on sediment concentration in runoff during flood events for hilly areas of the Loess Plateau, China. 2011. |
入库方式： OAI收割
来源：地理科学与资源研究所
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