Spatial Pattern Types and the Topography Factor of Gullies System in Yuanmou Dry-hot Valley

The spatial pattern of gullies system is less researched in areas of geomorphology of the gully erosion. Based on 1: 50000 topographic map and high-resolution remote sensing imagery,this paper extracted and classified the gullies system in the study area through hydrological analysis tools and visual interpretation for studying the spatial pattern types of the gullies system in Yuanmou Dry-hot Valley. The results showed that the gullies system in Yuanmou Dry-hot Valley were more complex. According to the different texture characteristics and the morphology of combination relations,the gullies system could be divided into 6 types: radial gully,comb gully,pinnate gully,trellis gully,dendritic gully and parallel gully.Different types of gullies system were formed mainly by the topography features and geomorphological sites. Studies on the spatial pattern types of gullies system can help in understanding the growth rules and formation mechanism of the gullies system in theory,but also provide scientific basis for prevention and treatment of erosion gully and optimization of environmental governance in the practice.