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Sediment concentrations in run-off varying with spatial scale in an agricultural subwatershed of the Chinese Loess Plateau
Zheng M. G.; Li, R. K.; He, J. J.
Source PublicationHydrological Processes
2015
Volume29
Issue26
Pages5414-5423
Keywordsoil erosion sediment yield scale hyperconcentrated flows Loess Plateau hilly areas soil-erosion hyperconcentrated flow delivery problem debris flow basin area yield dependency catchment river
AbstractInformation is scarce on the spatial-scale effect on sediment concentrations in run-off. This study addressed this issue within an agricultural subwatershed of the Chinese Loess Plateau, using data observed at a hilltop plot, three nested hillslope plots, two entire-slope plots (a combination of hillslope and valley side slope) and the subwatershed outlet. Dominated by the splash and sheet erosions, the hilltop plot has a minimum C-ae (mean sediment concentration for all recorded events) of 45 kgm(-3). Unexpectedly, the high sediment concentrations at the hilltop do not occur at high rainfall intensities or large run-off events because of the protection of surface soils by relatively thick sheet flows. Because of the emergence of rills, C-ae is as high as 310 kg m(-3) even on the most upper hillslope. Downslope, both C-ae and ESC (extreme large values of recorded sediment concentrations) increase; such a slope length effect attenuates with increasing slope length and event magnitude as a result of insufficient sediment availability associated with rill development. Active mass wastings ensure sufficient sediment supply and thus a spatially invariant C-ae (approximately 700 kgm(-3)) and ESC (approximately 1000 kg m(-3)) at the scale of the entire slope and subwatershed. Detailed examination shows that most small events experience a decrease in sediment concentrations when moving from the entire slope to the subwatershed, indicating that the spatially invariant sediment concentration is valid only for large run-off events. This study highlights the control of the spatial scale, which determines the dominant erosional process, on erosional regime. Copyright (C) 2015 John Wiley & Sons, Ltd.
Indexed BySCI
Language英语
ISSN0885-6087
DOI10.1002/hyp.10576
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document TypeSCI/SSCI论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/43603
Collection历年回溯文献
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GB/T 7714
Zheng M. G.,Li, R. K.,He, J. J.. Sediment concentrations in run-off varying with spatial scale in an agricultural subwatershed of the Chinese Loess Plateau. 2015.
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