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Geomorphic natural hazard on loess terrain: expansion on the gully sidewall

Author

Listed:
  • Yulei Ma

    (Dalian University of Technology)

  • Xiangzhou Xu

    (Dalian University of Technology)

  • Peiqing Xiao

    (Yellow River Institute of Hydraulic Research)

  • Qiao Yan

    (Dalian University of Technology)

  • Chao Zhao

    (Dalian University of Technology)

Abstract

Gully sidewall expansion is an important geomorphic natural hazard, and the expansion destroys a large extent of agricultural land in the loess regions every year. The main aim of this study was to identify the mechanisms behind gully sidewall expansion through a series of simulated rainfall experiments. The results show that land loss on the gentle slope was the result caused by the water and gravity erosions, and gravity erosion was the primary driving force. The correlation coefficient between the area of land loss on gentle slope and volume of gravity erosion on the gully sidewall was 0.93, and the correlation coefficient between the area of land loss on gentle slope and volume of water erosion was 0.71. The gravity erosion was the dominant impetus driving the change in slope gradient of the gully sidewall. The amount of gravity erosion in 17 of the 19 rainfall events causing a change greater than 5° in the slope gradient of the gully sidewall accounted for more than 50% of the total amount of sidewall erosion. Furthermore, the dynamic variation of the retreat rates for the gully shoulder line showed a similar trend to that of the total volume of sidewall erosion and exhibited an increase–decrease–increase tendency. The most significant factors affecting the change in slope gradient of the gully sidewall and retreat rate of the gully shoulder line were the rainfall duration and intensity, of which the sensitivity coefficients were 2.2 and 4.0, respectively. As a result, a combination of vegetation measures on the gentle slope, structural and ecological practices on the sidewall and powerful structural practices, e.g., check dams, on the gully floor, is preferred for sidewalls vulnerable to expansion.

Suggested Citation

  • Yulei Ma & Xiangzhou Xu & Peiqing Xiao & Qiao Yan & Chao Zhao, 2021. "Geomorphic natural hazard on loess terrain: expansion on the gully sidewall," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 109(3), pages 2535-2555, December.
    • Handle: RePEc:spr:nathaz:v:109:y:2021:i:3:d:10.1007_s11069-021-04931-2
    DOI: 10.1007/s11069-021-04931-2
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    References listed on IDEAS

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    1. Ion Ionita & Michael Fullen & Wojciech Zgłobicki & Jean Poesen, 2015. "Gully erosion as a natural and human-induced hazard," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 79(1), pages 1-5, November.
    2. Chaplot, Vincent & Brown, Jacqueline & Dlamini, Phesheya & Eustice, Tarryn & Janeau, Jean-Louis & Jewitt, Graham & Lorentz, Simon & Martin, Lauren & Nontokozo-Mchunu, Charmaine & Oakes, Ernest & Podwo, 2011. "Rainfall simulation to identify the storm-scale mechanisms of gully bank retreat," Agricultural Water Management, Elsevier, vol. 98(11), pages 1704-1710, September.
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