Effects of vegetation buffer strips on concentrated flow hydraulics and gully bed erosion based on in situ scouring experiments
文献类型： 外文期刊
作者： Dong, Yifan 1 ; Xiong, Donghong 1 ; Su, Zheng'an 1 ; Yang, Dan 1 ; Zheng, Xueyong 1 ; Shi, Liangtao 2 ; Poesen, Jean 4 ;
作者机构： 1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Surface Proc, 9,Block 4,South Renmin Rd, Chengdu 610041, Sichuan, Peoples R China
2.Yunnan Acad Agr Sci, Inst Trop Ecoagr Sci, Yuanmou 651300, Yunnan, Peoples R China
3.Katholieke Univ Leuven, Div Geog & Tourism, Dept Earth & Environm Sci, Celestijnenlaan 200E, BE-3001 Heverlee, Belgium
4.Katholieke Univ Leuven, Div Geog & Tourism, Dept Earth & Environm Sci,
关键词： braid index; deposition; gully erosion; split flow effects; vegetation buffer strips
期刊名称：LAND DEGRADATION & DEVELOPMENT （ 影响因子：4.977； 五年影响因子：5.291 ）
ISSN： 1085-3278
年卷期： 2018 年 29 卷 6 期
页码：
收录情况： SCI
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.
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