Distributive directions of gully system in Yuanmou Dry-hot Valley

摘要: Gully systems develop widely in the Yuanmou Dry-hot Valley. Based on Scheidegger method and non-parametric method, this study interpreted 1599 gullies using a DEM with scale of 1:50,000, remote sensing images were photographed by QuickBird. The objectives are to explore regularity that is shown distributive direction gully system understand factors (including aspect, slope, neotectonic stress field) control system. results show (1) maximum “dominant” overall, third fourth order, east, above 1400 m 270°; 270° has relative superiority. So Valleys area. (2) slope 38° threshold value which separates overall range. When range 0–38°, dominant factor; when 38–59°, aspect factor. So, increase value, topographic influence changed from aspect. (3) compressive field, 157.5°, proven not conflict directions 146.3, 157.5, 169, 180° principal stresses calculated for collision extrusion plates can form fracture surfaces provide favorable condition development drainage gullies. comprehensively affected terrain, other factors. Therefore, only enriches content morphology landform but also be basis evolutional effectively predicted area, it provides scientific guidance industrial agricultural production layout construction infrastructure.