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Sustainability 2015, 7(11), 15219-15242; doi:10.3390/su71115219

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

1
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
2
College of Construction Engineering, Jilin University, Changchun 130012, China
3
Institute of the Yangzi Gorges Exploration & Research, Commission of Water Conservancy of the Yangzi River, Wuhan 430000, China
4
LTD. of China Power Engineering Consulting Group, North China Power Engineering CO., Beijing 100000, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vincenzo Torretta
Received: 10 September 2015 / Revised: 9 November 2015 / Accepted: 12 November 2015 / Published: 18 November 2015
(This article belongs to the Section Sustainable Use of the Environment and Resources)
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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. View Full-Text
Keywords: debris flow; grain size distribution; debris flow material; catchment area debris flow; grain size distribution; debris flow material; catchment area
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhang, W.; Wang, Q.; Chen, J.; Li, H.; Que, J.; Kong, Y. Grain-Size Analysis of Debris Flow Alluvial Fans in Panxi Area along Jinsha River, China. Sustainability 2015, 7, 15219-15242.

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