Influence of bare soil and cultivated land use types upstream of a bank gully on soil erosion rates and energy consumption for different gully erosion zones in the dry-hot valley region, Southwest China

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• 作者：Zhengan Su ; Donghong Xiong ; Yifan Dong ; Dan Yang ; Su Zhang ; Baojun Zhang…
• 关键词：Bank gully ; Headcut erosion ; Energy consumption of flow ; Land use ; Dry ; hot valley
• 刊名：Natural Hazards
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：79
• 期：1-supp
• 页码：183-202
• 全文大小：5,472 KB
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• 作者单位：Zhengan Su (1)
  Donghong Xiong (1)
  Yifan Dong (1)
  Dan Yang (1) (2)
  Su Zhang (1) (3)
  Baojun Zhang (1) (2)
  Xueyong Zheng (1) (2)
  Jianhui Zhang (1)
  Liangtao Shi (4)
  
  1. Key Laboratory of Mountain Hazards and Earth Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Conservancy, Chengdu, 610041, China
  2. Graduate University of the Chinese Academy of Sciences, Beijing, 100049, China
  3. College of Agronomy, Sichuan Agricultural University, Chengdu, 611130, China
  4. Institute of Tropical Eco-agricultural Sciences, Yunnan Academy of Agricultural Sciences, Yuanmou, 651300, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Hydrogeology
  Geophysics and Geodesy
  Geotechnical Engineering
  Civil Engineering
  Environmental Management
  
• 出版者：Springer Netherlands
• ISSN：1573-0840

文摘

This study assessed temporal variation in soil erosion rates in response to energy consumption of flow (ΔE). It employed an in situ bank gully field flume experiment with upstream catchment areas with bare (BLG) or cultivated land (CLG) that drained down to bare gully headcuts. Water discharge treatments ranged from 30 to 120 L Min−1. Concentrated flow discharge clearly affected bank gully soil erosion rates. Excluding minimal discharge in the CLG upstream catchment area (30 L min−1), a declining power function trend (p ≤ 0.1) was observed with time in soil erosion rates for both BLG and CLG upstream catchment areas and downstream gully beds. Non-steady state soil erosion rates were observed after an abrupt collapse along the headcut slope after prolonged scouring treatments. However, as the experiment progressed, ΔE and energy consumption of flow per unit soil loss (ΔEu) exhibited a logarithmic growth trend (p < 0.1) at each BLG and CLG position. Although similar temporal trends in soil erosion and infiltration rates were observed, values clearly differed between BLG and CLG upstream catchment areas. Furthermore, Darcy–Weisbach friction factor (f) values in the CLG upstream catchment area were higher than the corresponding BLG area. In contrast to the BLG upstream catchment area, lower ΔEu and higher soil erosion rates were observed in the CLG upstream catchment area as a result of soil disturbances. This indicated that intensive land use changes accelerate soil erosion rates in upstream catchment areas of bank gullies and increase soil sediment transport to downstream gullies. Accordingly, reducing tillage disturbances and increasing vegetation cover in upstream catchment areas of bank gullies are essential in the dry-hot valley region of Southwest China.