Yifan Dong
Chinese Academy of Sciences
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Featured researches published by Yifan Dong.
Physical Geography | 2013
Yifan Dong; Donghong Xiong; Zhengan Su; Jiajia Li; Dan Yang; Juan Zhai; Xiaoning Lu; Gangcai Liu; Liangtao Shi
Gully initiation has been a subject of much discussion in the field of gully erosion. Gully initiation could be examined by the S–A relationship (S = aA − b ) between the critical slope of the gully head (S) and the upstream drainage area (A). Gully erosion plays an important role in sediment yield and land degradation in the Dry-hot Valley region of Southwest China; however, little research has focused on gully development in this region. This study investigated gully morphology and the critical topographic threshold of permanent gullies in Yuanmou Dry-hot Valley. Data for 36 gully heads were derived from the gully digital elevation model created by high-precision real-time kinematic GPS (RTK GPS). A significant relationship between gully length and volume (r 2 = 0.77, p < 0.01) was found to exist, indicating that gully length can be used to estimate the gully erosion rate. Additionally, as vegetation coverage inside the gully increases, the gully morphology tends to be stable. The S–A relationship was S = 0.5195A −.0899, while AS 2 values ranged between 4.2 and 758.5 m2. The low value of constant b (0.0899) indicates that collapse of the gully wall is the dominant process of gully erosion in Yuanmou Dry-hot Valley.
Physical Geography | 2016
Baojun Zhang; Donghong Xiong; Zhengan Su; Dan Yang; Yifan Dong; Liang Xiao; Su Zhang; Liangtao Shi
Abstract Headcut erosion has been recognized as one of the main processes involved in gully development in the dry-hot valley region of southwest China. To examine the effect of initial step height on headcut erosion processes, three headcuts were constructed ranging in height from 0.75 to 1.25 m on an active bank gully head, and a series of scouring experiments were conducted under a flow discharge of 120 L min−1. The morphological evolutions of the plunge pools and soil loss volume were estimated by three-dimensional photo-reconstruction methods (3D-PR). As the step height increased, the experimental results showed that: (1) the transformed potential energy and shear stress would increase by approximately 4.89 J s−1 and 26.4 Pa on average when the step height increased 0.25 m; (2) the mean depth and width of the plunge pool exhibited obvious growth, and the morphology of the cross-section developed from approximately V-shaped to U-shaped; and (3) soil loss volume increased logarithmically, with total soil loss volumes of 0.076, 0.105 and 0.116 m3, respectively. Although the significant effects of the initial step height on headcut erosion were verified, further quantitative studies are required to quantify the mechanism of headcut erosion, especially for plunge pool erosion.
Earth Surface Processes and Landforms | 2018
Baojun Zhang; Donghong Xiong; Guang-Hui Zhang; Su Zhang; Han Wu; Dan Yang; Liang Xiao; Yifan Dong; Zhengan Su; Xiaoning Lu
To quantify the changes in flow energy, sediment yield and surface landform impacted by headcut height during bank gully erosion, five experimental platforms were constructed with different headcut heights ranging from 25 to 125cm within an in situ active bank gully head. A series of scouring experiments were conducted under concentrated flow and the changes in flow energy, sediment yield and surface landform were observed. The results showed that great energy consumption occurred at gully head compared to the upstream area and gully bed. The flow energy consumption at gully heads and their contribution rates increased significantly with headcut height. Gully headcuts also contributed more sediment yield than the upstream area. The mean sediment concentrations at the outlet of plots were 2.3 to 7.3 times greater than those at the end of upstream area. Soil loss volume at gully heads and their contribution rates also increased with headcut height significantly. Furthermore, as headcut height increased, the retreat distance of gully heads increased, which was 1.7 to 8.9 times and 1.1 to 3.2 times greater than the incision depth of upstream area and gully beds. Positive correlations were found between energy consumption and soil loss, indicating that energy consumption could be used to estimate soil loss of headcut erosion. Headcut height had a significant impact on flow energy consumption, and thus influenced the changes in sediment yield and landform during the process of gully headcut erosion. Headcut height was one of the important factors for gully erosion control in this region. Further studies are needed to identify the role of headcut height under a wide condition. Copyright (c) 2018 John Wiley & Sons, Ltd.
Earth Surface Processes and Landforms | 2018
Zhengan Su; Donghong Xiong; Jianhui Zhang; Tao Zhou; Hongkun Yang; Yifan Dong; Haidong Fang; Liangtao Shi
Soil erodibility is an essential parameter used in soil erosion prediction. This study selected the Liangshan town watershed to quantify variation in the vertical zonality of rill erodibility (k(r)) in Chinas ecologically fragile Hengduan Mountains. Soil types comprised of yellow-brown (soil A), purple (soil B), and dry-red (soil C) in a descending order of occurrence from the summit to the valley, which roughly corresponds to the vertical climate zone (i.e. cool-high mountain, warm-low mountain, and dry-hot valley sections) of the study area. With elevation, vertical soil zonality varied in both soil organic matter (SOM) content and soil particle-size fractions. A series of rill erosion-based scour experiments were conducted, using water discharge rates of 100, 200, 300, 400, 500, and 600 mL min(-1). Additionally, detachment rates (Dr) were measured under three hydrological conditions (the drainage, saturation, and seepage treatments). Results show that both Dr and flow shear stress (&) values increased as discharge increased. As elevation increased, the k(r) values decreased, while the vertical zonality of critical shear stress (&(c)) values showed no obvious variation. The highest k(r) values were observed during the seepage treatment, followed by the saturation treatment then drainage treatment, indicating that variation in vertical hydraulic gradients could significantly alter k(r) values. This study also found that land-use types could also alter k(r) and &(c) values. Further research, however, is necessary to better quantify the effects of subsurface hydrological conditions and land-use types on k(r) under different soil zonalities in Chinas Hengduan Mountains. (c) 2018 John Wiley & Sons, Ltd.
Land Degradation & Development | 2013
Zhao Jin; Yifan Dong; Yuchun Qi; Weiguo Liu; Zhishan An
Geomorphology | 2014
Zhengan Su; Donghong Xiong; Yifan Dong; Jiajia Li; Dan Yang; Jianhui Zhang; Guangxiong He
Catena | 2014
Yifan Dong; Donghong Xiong; Zhengan Su; Jiajia Li; Dan Yang; Liangtao Shi; Gangcai Liu
Natural Hazards | 2015
Zhengan Su; Donghong Xiong; Yifan Dong; Dan Yang; Su Zhang; Baojun Zhang; Xueyong Zheng; Jianhui Zhang; Liangtao Shi
Archive | 2012
Zhengan Su; Donghong Xiong; Yifan Dong; Juan Zhai; Jiajia Li; Dan Yang
Catena | 2017
Dan Yang; Donghong Xiong; Baojun Zhang; Min Guo; Zhengan Su; Yifan Dong; Su Zhang; Liang Xiao; Xiaoning Lu