Effects of grass density on the runoff hydraulic characteristics and sediment yield in gully headcut erosion processes
文献类型：期刊论文
| 作者 | Feng, Lanqian2,3,4,5,6; Wang, Wenlong2,3,4,5,6,7; Guo, Mingming1,6; Shi, Qianhua8; Guo, Wenzhao6,7; Lou, Yibao7; Kang, Hongliang7; Chen, Zhuoxin2,3,4,5,6 |
| 刊名 | HYDROLOGICAL PROCESSES
 |
| 出版日期 | 2022-08-01 |
| 卷号 | 36期号:8页码:19 |
| 关键词 | energy consumption gravity erosion headcut erosion hydraulic properties root sediment yield |
| ISSN号 | 0885-6087 |
| DOI | 10.1002/hyp.14643 |
| 通讯作者 | Wang, Wenlong(nwafu_wwl@163.com) ; Guo, Mingming(guomingming@iga.ac.cn) |
| 英文摘要 | Vegetation plays a crucial role in gully headcut erosion. However, little is known about how grass influences runoff hydraulics, soil erosion and headcut erosion processes. A series of rainfall and scouring experiments were conducted on four plots to elucidate the effect of the density of Agropyron cristatum (L.) Gaertn (planting spaces: 20 x 20 cm(2), GA1; 15 x 15 cm(2), GA2; 10 x 10 cm(2), GA3; bare land as control, BL) on runoff hydraulics and soil erosion during gully headcut erosion. The velocity, Reynolds number (Re), runoff shear force (tau) and stream power (omega) of the BL increased exponentially with time (P < 0.01). However, for the grassland, most parameters increased linearly with time (P < 0.01). The Froude number (Fr) of the BL and grassland significantly decreased linearly and exponentially, respectively, with time (P < 0.01). For tau, the grass tableland needed to develop for a period of time to restrain it. The runoff of the BL tableland and gully head was supercritical turbulent, while that of the grassland was more dispersed. The existence of a gully head increased the jet velocity by 2.97%-67.19%, which increased the dispersion degree of the runoff. The runoff energy showed a significant exponential increase with time (P < 0.05). Compared with that of the BL, the energy consumption of the runoff from the grassland increased by 4.10%-31.81%. During gully headcut erosion, the BL was primarily cut down to the tableland by runoff, while the grassland was cut down to the headwall by on-wall flow. As the density increased, the benefit of sediment reduction increased, reaching a maximum of 66.79%. The collapse of the BL primarily occurred in the upper part of the headwall during the early experimental stage. The frequency and space-time ranges of the collapse of the grassland were larger than those of the BL. The gravity erosion types of the BL were headwall collapse and gully bank collapse, while those of the grasslands were headwall collapse and root-soil composite collapse. |
| WOS关键词 | DRY-HOT VALLEY ; INITIAL STEP HEIGHT ; OVERLAND-FLOW ; THRESHOLD CONDITIONS ; HILLSLOPE EROSION ; RILL DEVELOPMENT ; LOESS PLATEAU ; BANK GULLIES ; SOIL-EROSION ; VEGETATION |
| 资助项目 | National Natural Science Foundation of China[42107356] ; National Natural Science Foundation of China[42077079] ; National Natural Science Foundation of China[41907057] ; State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau[A314021402-202102] ; China Postdoctoral Science Foundation[2021T140663] ; China Postdoctoral Science Foundation[2020M681062] ; China Postdoctoral Science Foundation[2020M683591] ; Heilongjiang Provincial Natural Science Foundation of China[YQ2021C036] |
| WOS研究方向 | Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000833887600001 |
| 出版者 | WILEY |
| 资助机构 | National Natural Science Foundation of China ; State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau ; China Postdoctoral Science Foundation ; Heilongjiang Provincial Natural Science Foundation of China |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/181393]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Wang, Wenlong; Guo, Mingming |
| 作者单位 | 1.Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Mollisols Agroecol, Harbin, Peoples R China 2.Chinese Acad Sci, Res Ctr Soil & Water Conservat & Ecol Environm, Yangling, Shaanxi, Peoples R China 3.Minist Educ, Yangling, Shaanxi, Peoples R China 4.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling, Shaanxi, Peoples R China 5.Univ Chinese Acad Sci, Beijing, Peoples R China 6.Chinese Acad Sci & Minist Water Resources, State Key Lab Soil Eros & Dryland Farming Loess P, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 7.Northwest A&F Univ, Inst Soil & Water Conservat, Yangling, Shaanxi, Peoples R China 8.Taiyuan Univ Sci & Technol, Schaal Environm & Resources, Taiyuan, Peoples R China |
| 推荐引用方式 GB/T 7714 | Feng, Lanqian,Wang, Wenlong,Guo, Mingming,et al. Effects of grass density on the runoff hydraulic characteristics and sediment yield in gully headcut erosion processes[J]. HYDROLOGICAL PROCESSES,2022,36(8):19. |
| APA | Feng, Lanqian.,Wang, Wenlong.,Guo, Mingming.,Shi, Qianhua.,Guo, Wenzhao.,...&Chen, Zhuoxin.(2022).Effects of grass density on the runoff hydraulic characteristics and sediment yield in gully headcut erosion processes.HYDROLOGICAL PROCESSES,36(8),19. |
| MLA | Feng, Lanqian,et al."Effects of grass density on the runoff hydraulic characteristics and sediment yield in gully headcut erosion processes".HYDROLOGICAL PROCESSES 36.8(2022):19. |
入库方式： OAI收割
来源：地理科学与资源研究所
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