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Journal of Mountain Science

, Volume 12, Issue 5, pp 1241–1253 | Cite as

Sediment delivery across multiple spatio-temporal scales in an agriculture watershed of the Chinese Loess Plateau

  • Ming-guo Zheng
  • Run-kui Li
  • Ji-jun He
  • Ming CuiEmail author
Article

Abstract

There is a consensus that sediment delivery ratio in the Chinese Loess Plateau is close to 1 at the inter-annual timescale. However, little information is available about the sediment delivery at finer timescales. We evaluated the sediment delivery from plots to watersheds at the event or intra-annual, annual, and inter-annual timescales within the Wudinghe river basin, a 30,261 km2 basin in the Loess Plateau. We calculated the ratio of sediment output to sediment input and presented the temporal change of the channel morphology to determine whether sediment deposition occurs. Although a single flood event frequently has a sediment yield exceeding 10,000 t km−2, sediment deposition rarely occurs except during some small runoff events (sediment yield < 5000 t km−2) or dry years (sediment yield < 10,000 t km−2) when moving from slopes up to the main channels of the Wudinghe River. This observation suggests a sediment delivery ratio close to 1 even at the event or intra-annual and the annual timescales, but not necessarily at the interannual timescale. Such a high sediment delivery ratio can be related to hyper-concentrated flows, which have very strong sediment transport capacity even at low flow strength. Because hyper-concentrated flows are well-developed in the whole Loess Plateau, a sediment delivery ratio close to 1 below the interannual timescale possibly remains true for other rivers in the Loess Plateau.

Keywords

Sediment delivery ratio Spatial scale Soil erosion Sediment yield Loess Plateau 

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Copyright information

© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Ming-guo Zheng
    • 1
  • Run-kui Li
    • 2
  • Ji-jun He
    • 3
  • Ming Cui
    • 4
    Email author
  1. 1.Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences & Natural Resources ResearchChinese Academic of SciencesBeijingChina
  2. 2.College of Resources and EnvironmentUniversity of Chinese Academy of SciencesBeijingChina
  3. 3.Base of the State Laboratory of Urban Environmental Processes and Digital ModelingCapital Normal UniversityBeijingChina
  4. 4.Institute of Desertification StudiesChinese Academy of ForestryBeijingChina

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