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Soil erosion and sediment transport in the gullied Loess Plateau: Scale effects and their mechanisms

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Abstract

Scale effects exist in the whole process of rainfall-3-runoff-3-soil erosion-3-sediment transport in river basins. The differences of hydrographs and sediment graphs in different positions in a river basin are treated as basic scale effects, which are more complex in the gullied Loess Plateau, a region notorious for high intensity soil erosion and hyper-concentrated sediment-laden flow. The up-scaling method of direct extrapolation that maintains dynamical mechanism effective in large scale application was chosen as the methodology of this paper. Firstly, scale effects of hydrographs and sediment graphs were analyzed by using field data, and key sub-processes and their mechanisms contributing to scale effects were clearly defined. Then, the Digital Yellow River Model that integrates sub-models for the subprocesses was used with high resolution to simulate rainfall-3-runoff-3-soil erosion-3-sediment transport response in Chabagou watershed, and the distributed results representing scale effects were obtained. Finally, analysis on the simulation results was carried out. It was shown that gravitational erosion and hyper-concentrated flow contribute most to the spatial variation of hydrographs and sediment graphs in the spatial scale. Different spatial scale distributions and superposition of different sub-processes are the mechanisms of scale effects.

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Authors and Affiliations

  1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, 100084, China

    TieJian Li & GuangQian Wang

  2. Yellow River Engineering Consulting Co., Ltd., Zhengzhou, 450003, China

    Hai Xue

  3. North China Institute of Water Conservancy and Hydropower, Zhengzhou, 450008, China

    Hai Xue

  4. China Institute of Water Resources and Hydropower Research, Beijing, 100038, China

    Kai Wang

Authors
  1. TieJian Li
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  2. GuangQian Wang
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  3. Hai Xue
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  4. Kai Wang
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Corresponding author

Correspondence to GuangQian Wang.

Additional information

Supported by the National Basic Research Program of China (“973”) (Grant No. 2007CB714100), the National Natural Science Foundation of China (Grant Nos. 50849003, 50809028), and China Postdoctoral Science Foundation (Grant No. 20080440392)

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Li, T., Wang, G., Xue, H. et al. Soil erosion and sediment transport in the gullied Loess Plateau: Scale effects and their mechanisms. Sci. China Ser. E-Technol. Sci. 52, 1283–1292 (2009). https://doi.org/10.1007/s11431-009-0076-6

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  • DOI: https://doi.org/10.1007/s11431-009-0076-6

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