Morphology and controlling factors of the longitudinal profile of gullies in the Yuanmou dry-hot valley Morphology and controlling factors of the longitudinal profile of gullies in the Yuanmou dry-hot valley

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Vol14 No.4: 674-693

Title】Morphology and controlling factors of the longitudinal profile of gullies in the Yuanmou dry-hot valley

Author】DING Lin1; QIN Fa-chao1; FANG Hai-dong2; LIU Hui1; ZHANG Bin1*; SHU Cheng-qiang1; DENG Qing-chun1; LIU Gang-cai3; YANG Qian-qian1

Addresses】1 School of Land and Resources, China West Normal University, Nanchong 637009, China; 2Tropical Eco-agriculture Institute, Yunnan Academy of Agricultural Sciences, Yuanmou 651300, China; 3 Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China

Corresponding author】envgeo@163.com

Citation】Ding L, Qin FC, Fang HD, et al. (2017) Morphology and controlling factors of the longitudinal profile of gullies in the Yuanmou dry-hot valley. Journal of Mountain Science 14(4). DOI: 10.1007/s11629-016-4189-7

DOI】10.1007/s11629-016-4189-7

Abstract】The morphology of the gully longitudinal profile (GLP) is an important topographic index of the gully bottom associated with the evolution of the gullies. This index can be used to predict the development trend and evaluate the eroded volumes and soil losses by gullying. To depict the morphology of GLP and understand its controlling factors, the Global Positioning System Real-time Kinematic (GPS RTK) and the total station were used to measure the detail points along the gully bottom of 122 gullies at six sites of the Yuanmou dry-hot Valley. Then, nine parameters including length (Lt), horizontal distance (Dh), height (H), vertical erosional area (A), vertical curvature (Cv), concavity (Ca), average gradient (Ga), gully length-gradient index (GL), normalized gully length-gradient index (Ngl), were calculated and mapped using CASS, Excel andSPSS.Theresultsshowedthatthisstudyareaisdominated by slightly concave and medium gradient GLPs, and the lithology of most gullies is sandstone and siltstone. Although different types of GLPs appear at different sites,all parameters present a positively skewed distribution. There are relatively strong correlations between several parameters: namely Lt and H, Dh and H, Lt and A, Dh and A, H and GL. Most GLPs, except three, have a best fit of exponential functions with quasi-straight shapes. Soil properties, vegetation coverage, piping erosion and topography are important factors to affect the GLP morphology. This study provides useful insight into the knowledge of GLP morphology and its influentialfactorsthat are of critical importance to prevent and control gully erosion.

Keywords】Gully longitudinal profile; Morphological characteristics; Soil erosion; Gully erosion; Controlling factors; Dry-hot valley