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Slope Runoff Process and Regulation Threshold under the Dual Effects of Rainfall and Vegetation in Loess Hilly and Gully Region

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  • Qiufen Zhang

    (Yellow River Institute of Hydraulic Research, Henan Key Laboratory of Yellow Basin Ecological Protection and Restoration, Zhengzhou 450003, China)

  • Xizhi Lv

    (Yellow River Institute of Hydraulic Research, Henan Key Laboratory of Yellow Basin Ecological Protection and Restoration, Zhengzhou 450003, China)

  • Yongxin Ni

    (Yellow River Institute of Hydraulic Research, Henan Key Laboratory of Yellow Basin Ecological Protection and Restoration, Zhengzhou 450003, China)

  • Li Ma

    (Yellow River Institute of Hydraulic Research, Henan Key Laboratory of Yellow Basin Ecological Protection and Restoration, Zhengzhou 450003, China)

  • Jianwei Wang

    (Yellow River Institute of Hydraulic Research, Henan Key Laboratory of Yellow Basin Ecological Protection and Restoration, Zhengzhou 450003, China)

Abstract

The rainfall in loess hilly and gully area is concentrated, and mostly comes in the form of rainstorms. The runoff on the slope caused by rainstorms is the main cause of serious soil and water loss in the loess hilly area, and the grassland vegetation has a good inhibitory effect on the runoff on the slope. Therefore, it is of great significance to reveal the role of grassland vegetation in the process of runoff generation, and the mechanisms for controlling soil erosion in this area. In this study, typical grassland slopes in hilly and gully regions of the loess plateau were taken as research objects. Through artificial rainfall in the field, the response rules of the slope rainfall-runoff process to different grass coverage were explored. The results show that: (1) With the increase in rainfall intensity, the inhibitory effect of grassland vegetation on slope runoff decreased, which was mainly reflected in the gradual decrease in runoff rate and runoff coefficient, and the time required to reach stability gradually shortened. (2) Under 60 mm/h rainfall intensity, the sensitivity of runoff coefficient to 31.5% of grass cover change is the lowest, and the cost performance of grass cover with 55% coverage is the highest. (3) Grass coverage inhibited slope runoff by changing the hydraulic characteristics of the slope, but this effect was only obvious in low rainfall intensity and early rainfall. Rainfall in the loess hilly area is characterized by intense rain. The regulating effect of grass cover on slope runoff is not particularly significant under high intensity rainfall. If only considering the regulation of grassland vegetation on slopes, more than 60% grassland coverage is more efficient in inhibiting slope runoff under medium and low intensity rainfall.

Suggested Citation

  • Qiufen Zhang & Xizhi Lv & Yongxin Ni & Li Ma & Jianwei Wang, 2023. "Slope Runoff Process and Regulation Threshold under the Dual Effects of Rainfall and Vegetation in Loess Hilly and Gully Region," Sustainability, MDPI, vol. 15(9), pages 1-14, May.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:9:p:7582-:d:1139943
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    References listed on IDEAS

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    1. Chao Liu & Kanghong Wang & Linhai Gao & Yarong Sun & Qinxia Yang & Bozhao Cao & Lin Chen & Dong Xue & Jian Wang, 2022. "Influence of Rainfall Intensity and Slope on Runoff and Sediment Reduction Benefits of Fine Mesh Net on Construction Spoil Deposits," Sustainability, MDPI, vol. 14(9), pages 1-14, April.
    2. Thiago Augusto Mendes & Roberto Dutra Alves & Gilson de Farias Neves Gitirana & Sávio Aparecido dos Santos Pereira & Juan Félix Rodriguez Rebolledo & Marta Pereira da Luz, 2021. "Evaluation of Rainfall Interception by Vegetation Using a Rainfall Simulator," Sustainability, MDPI, vol. 13(9), pages 1-16, May.
    3. Shi, Peng & Li, Peng & Li, Zhanbin & Sun, Jingmei & Wang, Dejun & Min, Zhiqiang, 2022. "Effects of grass vegetation coverage and position on runoff and sediment yields on the slope of Loess Plateau, China," Agricultural Water Management, Elsevier, vol. 259(C).
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    Cited by:

    1. Kai Gao & Zhigang Kong & Yanqing Li & Fei Zhao & Baoxin Cai & Dehua Shi & Ren Wang, 2024. "Experimental Study on Runoff and Sediment Production of the Fully Weathered Granite Backfill Slope under Heavy Rain in Longling, Yunnan Province," Sustainability, MDPI, vol. 16(4), pages 1-23, February.

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