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[1]ZHANG Li,ZHANG Qing-feng,ZHENG Zi-cheng,et al.M-DEM-based Stream Fractal Dimension of Artificial Backhoe Cultivated Loess Slope[J].Research of Soil and Water Conservation,2012,19(05):7-11.

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M-DEM-based Stream Fractal Dimension of Artificial Backhoe Cultivated Loess Slope

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 19 Number of periods: 2012 05 Page number: 7-11 Column: Public date: 2012-10-20

Title:: M-DEM-based Stream Fractal Dimension of Artificial Backhoe Cultivated Loess Slope

Author(s):: ZHANG Li^1,2, ZHANG Qing-feng^1,2,3,4, ZHENG Zi-cheng^3,5, WANG Jian^1,2,3,4; 1. College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. Key Lab for Agricultural Resources and Environmental Remediation in Loess Plateau of Agriculture Ministry of China, Yangling, Shaanxi 712100, China;
3. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China;

Keywords:: fractal; micro-topography; tillage measures; ArcGIS

CLC:: S157

DOI:: -

Abstract:: This paper aims to explore a way to illustrate the stream network forming process with its fractal geometry characteristic of micro-topography in the micro scale, and provide the scientific basis for further research about slope surface water erosion process and prevention. In this paper, 4 M-DEMs for artificial backhoe cultivated loess slope with the slope gradient of 15°and the rainfall intensity of 90 mm/h were built during the evolution of soil erosion from before rainfall(BR)→splash erosion(SpE)→ sheet erosion(ShE)→ rill erosion(RE) based on laboratory experiment. Then stream networks for different catchments thresholds were extracted with the support of ArcGIS 9.3 soft package. Correspondingly, fractal dimensions were calculated based on the grid method. The results showed that:(1) fractal theory could be safely adopted to the study of river network with its forming process of micro-topography;(2) the optimal catchments thresholds of each rainfall stage were 15, 20, 25, 30 cm², and the optimal fractal dimensions were 1.067, 1.088, 1.068 and 1.079, respectively;(3) Artificial backhoe slope erosion was still in the primary stage. In general, a methodology on a micro-topographic stream with its fractal dimension is illustrated, and it should be safe to be adopted for further research for surface micro-topographic.

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