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Influence of Topographic Factors on the Characteristics of Gully Systems in Mountainous Areas of Ningnan Dry-Hot Valley, SW China

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  • Yuxin Cen

    (School of Geographical Sciences, China West Normal University, Nanchong 637009, China
    Sichuan Provincial Engineering Laboratory of Monitoring and Control for Soil Erosion in Dry Valleys, China West Normal University, Nanchong 637009, China)

  • Bin Zhang

    (School of Geographical Sciences, China West Normal University, Nanchong 637009, China
    Sichuan Provincial Engineering Laboratory of Monitoring and Control for Soil Erosion in Dry Valleys, China West Normal University, Nanchong 637009, China
    Liangshan Soil Erosion and Ecological Restoration in Dry Valleys Observation and Research Station, China West Normal University, Nanchong 637009, China)

  • Jun Luo

    (School of Geographical Sciences, China West Normal University, Nanchong 637009, China
    Sichuan Provincial Engineering Laboratory of Monitoring and Control for Soil Erosion in Dry Valleys, China West Normal University, Nanchong 637009, China
    Liangshan Soil Erosion and Ecological Restoration in Dry Valleys Observation and Research Station, China West Normal University, Nanchong 637009, China
    State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, University of Chinese Academy of Sciences, Beijing 100048, China)

  • Qingchun Deng

    (School of Geographical Sciences, China West Normal University, Nanchong 637009, China
    Sichuan Provincial Engineering Laboratory of Monitoring and Control for Soil Erosion in Dry Valleys, China West Normal University, Nanchong 637009, China
    Liangshan Soil Erosion and Ecological Restoration in Dry Valleys Observation and Research Station, China West Normal University, Nanchong 637009, China)

  • Hui Liu

    (School of Geographical Sciences, China West Normal University, Nanchong 637009, China
    Sichuan Provincial Engineering Laboratory of Monitoring and Control for Soil Erosion in Dry Valleys, China West Normal University, Nanchong 637009, China
    Liangshan Soil Erosion and Ecological Restoration in Dry Valleys Observation and Research Station, China West Normal University, Nanchong 637009, China)

  • Lei Wang

    (School of Geographical Sciences, China West Normal University, Nanchong 637009, China
    Sichuan Provincial Engineering Laboratory of Monitoring and Control for Soil Erosion in Dry Valleys, China West Normal University, Nanchong 637009, China
    Liangshan Soil Erosion and Ecological Restoration in Dry Valleys Observation and Research Station, China West Normal University, Nanchong 637009, China)

Abstract

A gully system is an important indicator that reflects the development of regional topography and landforms, and topography is one of the most important factors affecting the development of gullies. However, at present, research on the impact of topography on the development of gully systems in the mountainous area of Ningnan dry-hot valley still needs to be strengthened. In order to study the characteristics of gullies and the influence of topography on the development of gully systems, based on both the visual interpretation of remote sensing images and field investigations, five topographic factors (elevation, slope gradient, aspect, relief, and dissection) were employed and three gully erosion indexes (gully length, density, and frequency) were calculated. The geographical information system was used in this study to carry out the spatial analysis, Ward’s hierarchical clustering and correlation analysis. Results showed that the development of gully systems is greatly affected by the degree of relief and dissection, and there is a significant positive correlation ( p < 0.01; p < 0.05), while elevation, slope gradient and aspect have little influence on it. Analysis of the gully systems showed that the gully erosion is the most intense in the area with an elevation of 2800–3200 m and slope gradients ≥ 38°. Furthermore, the degree of erosion on shady slopes was greater than that on sunny slopes. These results will help us to understand the spatial distribution and formation of gully systems in mountainous areas.

Suggested Citation

  • Yuxin Cen & Bin Zhang & Jun Luo & Qingchun Deng & Hui Liu & Lei Wang, 2022. "Influence of Topographic Factors on the Characteristics of Gully Systems in Mountainous Areas of Ningnan Dry-Hot Valley, SW China," IJERPH, MDPI, vol. 19(14), pages 1-17, July.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:14:p:8784-:d:866436
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    References listed on IDEAS

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