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Characteristics and Projection of Rainfall Erosivity Distribution in the Hengduan Mountains

Author

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  • Xinlan Liang

    (College of Water Conservancy and Hydropower Engineering, Sichuan Agricultural University, Ya’an 625014, China
    These authors contributed equally to this work.)

  • Lei Zhang

    (College of Water Conservancy and Hydropower Engineering, Sichuan Agricultural University, Ya’an 625014, China
    These authors contributed equally to this work.)

  • Shuqin He

    (College of Forestry, Sichuan Agricultural University, Chengdu 611130, China)

  • Ke Song

    (College of Water Conservancy and Hydropower Engineering, Sichuan Agricultural University, Ya’an 625014, China)

  • Zicheng Zheng

    (College of Resources, Sichuan Agricultural University, Chengdu 611130, China)

Abstract

This study examines the spatiotemporal variations of rainfall erosivity in the Hengduan Mountains, known for their rugged terrain and high potential for soil erosion risks, over the past 30 years. Additionally, it investigates the changing trends of rainfall erosivity between 2025 and 2040 under the Sustainable Development Pathway 2–4.5 (SSP2–4.5), using four Global Climate Models (GCMs) based on the Coupled Model Intercomparison Project phase 6 (CMIP6). The results indicate: (1) The annual distribution of rainfall erosivity in the Hengduan Mountains exhibited significant seasonal variations, ranking in the order of summer > autumn > spring > winter on a seasonal scale. (2) Over the past 30 years, there has been a slight decrease in annual precipitation and a corresponding slight increase in rainfall erosivity. Periodic extreme values occur every 6–8 years. (3) Spatially, rainfall erosivity demonstrates a decreasing gradient from southeast to northwest. There is a significant positive correlation between rainfall erosivity and precipitation, while a significant negative correlation exists with elevation in the vertical direction. Furthermore, the northeastern part of the Hengduan Mountains exhibits an increasing trend of rainfall erosivity, while the southern region experiences a decreasing trend. (4) Considering the joint driving forces of increased precipitation and erosive rainfall events, rainfall erosivity is expected to significantly increase in the future, posing a more severe risk of soil erosion in this region.

Suggested Citation

  • Xinlan Liang & Lei Zhang & Shuqin He & Ke Song & Zicheng Zheng, 2023. "Characteristics and Projection of Rainfall Erosivity Distribution in the Hengduan Mountains," Land, MDPI, vol. 12(7), pages 1-21, July.
    • Handle: RePEc:gam:jlands:v:12:y:2023:i:7:p:1435-:d:1196743
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    References listed on IDEAS

    as
    1. Ji He & Yu-Rong Wan & Hai-Tao Chen & Song-Lin Wang, 2022. "Effects of Land Use Change on Rainfall Erosion in Luojiang River Basin, China," Sustainability, MDPI, vol. 14(14), pages 1-13, July.
    2. Wenfeng Chi & Yuetian Wang & Yuxin Lou & Ya Na & Qiancheng Luo, 2022. "Effect of Land Use/Cover Change on Soil Wind Erosion in the Yellow River Basin since the 1990s," Sustainability, MDPI, vol. 14(19), pages 1-16, October.
    3. Xiaoyun Sun & Guotao Zhang & Jiao Wang & Chaoyue Li & Shengnan Wu & Yao Li, 2022. "Spatiotemporal variation of flash floods in the Hengduan Mountains region affected by rainfall properties and land use," 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. 111(1), pages 465-488, March.
    4. Chiara Vallebona & Elisa Pellegrino & Paolo Frumento & Enrico Bonari, 2015. "Temporal trends in extreme rainfall intensity and erosivity in the Mediterranean region: a case study in southern Tuscany, Italy," Climatic Change, Springer, vol. 128(1), pages 139-151, January.
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