Characteristics and controlling factors of rills in the micro-watershed of Yuanmou Dry-hot Valley
Li Xiang, Deng Qingchun, Zhang Bin, Liu Hui, Liu Gangcai, Luo Mingliang
1.School of Land and Resources, China West Normal University, 637009, Nanchong, Sichuan, China;2.Institute of Mountain Hazards and Environment, CAS, 610041, Chengdu, China
Abstract：Characteristics, process and mechanism of rills are key hotspot in the field of soil erosion and gully erosion geomorphology. In order to reveal the developing characteristics and controlling factors at the micro-topography scale, based on the field survey and data collection at Tutujiliangzi in Yuanmou County of Yunnan Province, and with the support of ArcGIS, we worked out the shape parameters of watershed and rill. The results showed that the ranges of variation in the width, length, area of rill cross section were respectively in 0.22 - 0.75 m, 0.061 - 0.512 m, and 68.01 - 1 777.28 cm2. The variation of width/depth ratio ranged from 0.848 to 3.517. It was not obvious for the development of rill from 8th to 20th m, but the shoulder-lines in left and right sides and the thalueg of will from t to 8th m and 20th m to the end of rill were developing heavily. The area of cross section had a positive relationship with catchment area of rill. The width, length and area of rill cross section ied with the distance from rill-head to the cross section. The variety followed a certain trend but not stable. There were few and scattered plants in gentle slopes of the rill but other similar laces had no vegetations. Plants existed in the gentle slopes at the exit of the rill. Rill slope controls the potential water energy and influences the developing process of rill. The effect of stening soil of root system improves the ability of resisting soil erosion. These results are due to the coupling effect of catchment area, local slope degree and vegetations. This paper will not only reveal theoretically the regularity of rill forms and developing mechanism of rills at the micro-topography scale but also help to provide prevention measures for water and soil losses and environmental protection.
李响1, 邓青春1, 张斌1, 刘辉1, 刘刚才2, 罗明良1. 元谋干热河谷微流域细沟形态特征及控制因素[J]. 中国水土保持科学, 2015, 13(5): 24-30.
Li Xiang, Deng Qingchun, Zhang Bin, Liu Hui, Liu Gangcai, Luo Mingliang. Characteristics and controlling factors of rills in the micro-watershed of Yuanmou Dry-hot Valley. SSWCC, 2015, 13(5): 24-30.
2015, Vol. 13 
