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Grain-Size Analysis of Debris Flow Alluvial Fans in Panxi Area along Jinsha River, China

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  • Wen Zhang

    (State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
    College of Construction Engineering, Jilin University, Changchun 130012, China)

  • Qing Wang

    (College of Construction Engineering, Jilin University, Changchun 130012, China)

  • Jianping Chen

    (College of Construction Engineering, Jilin University, Changchun 130012, China)

  • Huizhong Li

    (Institute of the Yangzi Gorges Exploration & Research, Commission of Water Conservancy of the Yangzi River, Wuhan 430000, China)

  • Jinsheng Que

    (LTD. of China Power Engineering Consulting Group, North China Power Engineering CO., Beijing 100000, China)

  • Yuanyuan Kong

    (College of Construction Engineering, Jilin University, Changchun 130012, China)

Abstract

The basic geometric parameters of 236 debris flow catchments were determined by interpreting SPOT5 remote sensing images with a resolution of 2.5 m in a 209 km section along the Jinsha River in the Panxi area, China. A total of 27 large-scale debris flow catchments were selected for detailed in situ investigation. Samples were taken from two profiles in the deposition zone for each debris flow catchment. The φ value gradation method of the grain size was used to obtain 54 histograms with abscissa in a logarithmic scale. Five types of debris flows were summarized from the outline of the histogram. Four grain size parameters were calculated: mean grain size, standard deviation, coefficient of skewness, and coefficient of kurtosis. These four values were used to evaluate the features of the histogram. The grain index that reflects the transport (kinetic) energy information of debris flows was defined to describe the characteristics of the debris-flow materials. Furthermore, a normalized grain index based on the catchment area was proposed to allow evaluation of the debris flow mobility. The characteristics of the debris-flow materials were well-described by the histogram of grain-size distribution and the normalized grain index.

Suggested Citation

  • Wen Zhang & Qing Wang & Jianping Chen & Huizhong Li & Jinsheng Que & Yuanyuan Kong, 2015. "Grain-Size Analysis of Debris Flow Alluvial Fans in Panxi Area along Jinsha River, China," Sustainability, MDPI, vol. 7(11), pages 1-24, November.
    • Handle: RePEc:gam:jsusta:v:7:y:2015:i:11:p:15219-15242:d:59021
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    References listed on IDEAS

    as
    1. Wen Zhang & Jian-ping Chen & Qing Wang & Yuke An & Xin Qian & Liangjun Xiang & Longxiang He, 2013. "Susceptibility analysis of large-scale debris flows based on combination weighting and extension methods," 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. 66(2), pages 1073-1100, March.
    2. Wen Zhang & Hui-Zhong Li & Jian-ping Chen & Chen Zhang & Li-ming Xu & Wei-feng Sang, 2011. "Comprehensive hazard assessment and protection of debris flows along Jinsha River close to the Wudongde dam site in China," 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. 58(1), pages 459-477, July.
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    Cited by:

    1. Peizhen Li & Tangzhenhao Li & Zheng Lu & Jin Li, 2017. "Study on Dynamic Response of Novel Masonry Structures Impacted by Debris Flow," Sustainability, MDPI, vol. 9(7), pages 1-22, June.

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