M-DEM-based Stream Fractal Dimension of Artificial Backhoe Cultivated Loess Slope
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 re- search about slope surface water erosion process and prevention. In this paper, 4 M-DEMs for artificial back- hoe cultivated loess slope with the slope gradient of 15~ and the rainfall intensity of 90 mm/h were built dur- ing 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 cal- culated 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.
国家科技期刊平台
NSTL
万方数据
维普
