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Effects of vegetation buffer strips on concentrated flow hydraulics and gully bed erosion based on in situ scouring experiments
Yifan Dong1,3; Donghong Xiong1; Zheng'an Su1; Dan Yang1; Xueyong Zheng1; Liangtao Shi2; Jean Poesen3
第一作者单位Key Laboratory of Mountain Hazards &Surface Process, Institute of MountainHazards and Environment, Chinese Academyof Sciences, 610041 Chengdu, PR China ; Division of Geography and Tourism,Department of Earth and EnvironmentalSciences, Katholieke Universiteit Leuven, Celestijnenlaan 200E, BE‐3001 Heverlee,Belgium
通讯作者单位Institute of Tropical Eco‐agriculturalSciences, Yunnan Academy of AgriculturalSciences, Yuanmou 651300 Yunnan, PR China
通讯作者Donghong Xiong
2018
发表期刊LAND DEGRADATION & DEVELOPMENT
ISSN1085-3278
EISSN1099-145X
卷号29期号:6页码:1672-1682
文章类型Article
产权排序2
摘要Vegetation on gully beds could intercept runoff, reduce incision of gully bed, and trap sediment from upstream area. The aim of this study is to evaluate the influences of vegetation buffer strips on concentrated flow hydraulics and gully bed erosion downstream of gully headcuts. Five gully head plots containing different buffer strip widths with similar vegetation density were constructed for in situ scouring experiments. Each plot received 11 tests with 2 discharges (i.e., 7 tests simulating 83.3 L min(-1) and 4 tests simulating 166.7 L min(-1)). Buffer strips clearly decrease flow hydraulics (about 56-70%) and increase flow resistance (1.2 to 1.5 times) according to the selected hydraulic parameters. After 11 tests, total net erosion volume (NEV) and average sediment concentration from each gully bed showed an exponential decreasing relationship with increasing widths of buffer strips. All the selected hydraulic parameters showed a strong correlation with total NEV from the bare soil sections (0.43 < R-2 < .61 with significance level reaching .01), whereas the relationship was very weak in the buffer strips. The gross deposition volume in buffer strips showed a linear correlation with upstream NEV (NEVu) and flow velocity (R-2 = .91, p < .001). Split flow effects expressed by braid index increased with increasing widths of buffer strips and scouring times. Both bare and vegetated sections suffered from erosion clearly, but the average NEV from buffer strips was about 30.2% of bare soil sections. This indicated the buffer strip effects on reducing erosion were more significant than trapping sediments were in this study.
关键词braid index deposition gully erosion split flow effects vegetation buffer strips
DOI10.1002/ldr.2943
收录类别SCI
语种英语
WOS记录号WOS:000435278900013
引用统计
文献类型期刊论文
条目标识符http://ir.imde.ac.cn/handle/131551/23161
专题山地灾害与地表过程重点实验室
作者单位1.Key Laboratory of Mountain Hazards &Surface Process, Institute of MountainHazards and Environment, Chinese Academyof Sciences, 610041 Chengdu, PR China;
2.Institute of Tropical Eco‐agriculturalSciences, Yunnan Academy of AgriculturalSciences, Yuanmou 651300 Yunnan, PR China;
3.Division of Geography and Tourism,Department of Earth and EnvironmentalSciences, Katholieke Universiteit Leuven,Celestijnenlaan 200E, BE‐3001 Heverlee,Belgium
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Yifan Dong,Donghong Xiong,Zheng'an Su,et al. Effects of vegetation buffer strips on concentrated flow hydraulics and gully bed erosion based on in situ scouring experiments[J]. LAND DEGRADATION & DEVELOPMENT,2018,29(6):1672-1682.
APA Yifan Dong.,Donghong Xiong.,Zheng'an Su.,Dan Yang.,Xueyong Zheng.,...&Jean Poesen.(2018).Effects of vegetation buffer strips on concentrated flow hydraulics and gully bed erosion based on in situ scouring experiments.LAND DEGRADATION & DEVELOPMENT,29(6),1672-1682.
MLA Yifan Dong,et al."Effects of vegetation buffer strips on concentrated flow hydraulics and gully bed erosion based on in situ scouring experiments".LAND DEGRADATION & DEVELOPMENT 29.6(2018):1672-1682.
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