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水蚀过程中地表糙度变化研究,特别是微地表条件下水蚀过程中地表糙度的分布及变化特征的研究是土壤侵蚀学科领域的前沿问题,目前仍处于不断的探索与发展阶段。本文试图通过对陕西省杨凌区农耕地土壤进行固定坡度和雨强下不同耕作措施的室内人工降雨试验,建立微地形条件下高精度的DEM并进行分析,探讨地表糙度在水蚀过程中的时空变异分布。结果表明:(1)人为耕作对坡面地表糙度的整体分布状态和坡面高程空间分布状况的影响显著;(2)降雨对等高耕作、人工锄耕、人工掏挖耕作措施的高程分布有一定的影响,并且高程变化量的最大值均出现在坡面的下部;(3)在降雨侵蚀的产流前后,坡面糙度的空间变化最大,而产流后糙度的空间变化趋于平稳。研究结果初步揭示了微地表条件下地表糙度的时空变异状况,并可为进一步分析不同坡度、不同雨强条件下地表糙度的综合研究奠定基础。
Research on the variation of surface roughness during water erosion, especially the research on the distribution and variation characteristics of surface roughness in water erosion process under micro-surface conditions, is a frontier problem in the field of soil erosion and is still in the stage of continuous exploration and development. This paper tries to set up a high-precision DEM under the micro-topography and analyze the indoor artificial rainfall experiment with fixed slope and different tillage measures under the rainfall intensity in the agricultural land in Yangling, Shaanxi Province, to analyze the spatial and temporal variations of the surface roughness in the process of water erosion Variation distribution. The results showed that: (1) Anthropogenic tillage had a significant effect on the overall distribution of surface roughness and the spatial distribution of slope elevation; (2) The elevation distribution of rainfall on the equivalent tillage, artificial tillage and artificial trenching (3) Before and after the rainfall erosion, the spatial variation of slope roughness is the largest, while the spatial variation of the roughness after the runoff In a stable. The results revealed the spatio-temporal variations of surface roughness under microdiversity conditions, and laid the foundation for the further analysis of surface roughness under different slopes and different rainfall conditions.