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Composite Fingerprint Analysis of Sediment Sources in a Watershed Disturbed by Road Construction in Southeastern Tibet

Author

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  • Xin Li

    (College of Earth Science, Chengdu University of Technology, Chengdu 610059, China)

  • Baicheng Zhu

    (College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, China)

  • Longxi Cao

    (College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, China
    Tianfu Yongxing Laboratory, Chengdu 610213, China)

  • Rui Li

    (College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, China)

  • Chunlian Bai

    (College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, China)

  • Xinjun Wang

    (China Academy of Transportation Sciences, Beijing 100029, China)

Abstract

Construction activities such as road projects modify original land uses and intensify soil erosion. Understanding the sediment contributed by these projects and its spatial variation throughout a watershed is critical in terms of guiding conservation. Based on field sampling in a road construction-disturbed watershed in southeastern Tibet, a composite fingerprint analysis was conducted to explore the contributions of different sources to the deposited sediment. The results showed that 10 factors, including Al 2 O 3 , TFe 2 O 3 , Sn, total phosphorous (TP), Cr, Na 2 O, Mn, W, SiO 2 , and Sr, formed an optimum composite fingerprint combination. The multivariate mixed model revealed that the average contribution percentage rates of sediment deposited along the main channel were as follows: bank material (52.52%) > roads (33.02%) > forest and grassland (14.46%). The contribution percentage of road-related sediment fluctuated from the beginning point along the channel and was significantly correlated with factors such as the flow length to the channel (R = −0.6), road segment slope (R = 0.66), and ratio of the road length to the channel length (R = 0.65). The flow length to the channel was the most important factor affecting the road sediment contribution and a decreasing logarithmic function was established to describe the effect. These results have clarified how road construction spatially affects sediment at the watershed scale. They can therefore offer guidance for evaluating the environmental impact of human activities and supporting efforts in watershed soil and water conservation.

Suggested Citation

  • Xin Li & Baicheng Zhu & Longxi Cao & Rui Li & Chunlian Bai & Xinjun Wang, 2024. "Composite Fingerprint Analysis of Sediment Sources in a Watershed Disturbed by Road Construction in Southeastern Tibet," Land, MDPI, vol. 13(7), pages 1-18, June.
    • Handle: RePEc:gam:jlands:v:13:y:2024:i:7:p:929-:d:1422567
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    References listed on IDEAS

    as
    1. William F. Laurance & Andrew Balmford, 2013. "A global map for road building," Nature, Nature, vol. 495(7441), pages 308-309, March.
    2. Neeraj Pant & Rajendra Kumar Dubey & Anand Bhatt & Shive Prakash Rai & Prabhat Semwal & Sumit Mishra, 2020. "Soil erosion and flood hazard zonation using morphometric and morphotectonic parameters in Upper Alaknanda river basin," 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. 103(3), pages 3263-3301, September.
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