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[1]MI Zhi-juan,MU Xing-min,ZHAO Guang-ju.Multifractal Analysis of Sediment Grain Size in a Small Watershed of Water-wind Erosion Crisscross Region on the Loess Plateau[J].Research of Soil and Water Conservation,2014,21(01):12-17.

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Multifractal Analysis of Sediment Grain Size in a Small Watershed of Water-wind Erosion Crisscross Region on the Loess Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 21 Number of periods: 2014 01 Page number: 12-17 Column: Public date: 2014-02-28

Title:: Multifractal Analysis of Sediment Grain Size in a Small Watershed of Water-wind Erosion Crisscross Region on the Loess Plateau

Author(s):: MI Zhi-juan¹, MU Xing-min^2,3, ZHAO Guang-ju^2,3; 1. College of Water Resource and Architectural Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China;
3. Institute of Soil and Water Conservation, Chinese Academy and Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China

Keywords:: checkdam; sediment size; fractal dimension; multifractal characteristics; Loess Plateau

CLC:: S152.3

DOI:: -

Abstract:: Grain size is one of the most important physical attributes due to its influence on sediment properties related to surface morphology of sediment, the mechanical composition of sediment, the arrangement of grains and flocculation of cohesive of sediment. So in the water-wind erosion crisscross region, ways of sediment generation have strong discrepancy with different patterns of surface cover, which lead to the differences in grain size distribution. In this paper, special dam on the Loess Plateau was taken as an example. The fractal dimension and multifractal theory were applied to study the fractal characteristics of grain size distribution in the checkdam and potential sediment sources. The results show that a good linear relationship between the sediment deriving from the slope and the sediment which deposited in the checkdam were found. Fractal dimension (D) in the checkdam decrease with the increase of sediment particles in the vertical direction. The same result is reflected by the five parameters such as D, D(0), D(1), D(2), D(0)/D(1). Under different types of surface cover, the grain size distribution of the grassland is uniform, bare land is the secondary, and the most narrow distribution is observed in sandstone. So the grassland, bare land and sandstone can allow the determination of sediment sources. Our results could be used to study the sediment source of small watershed and provide an important basis with soil and water conservation.

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