期刊
SUSTAINABILITY
卷 7, 期 11, 页码 15219-15242出版社
MDPI
DOI: 10.3390/su71115219
关键词
debris flow; grain size distribution; debris flow material; catchment area
资金
- National Natural Key Science Program Foundation [41130745, 41330636]
- National Natural Science Foundation of China Natural Science Foundations of China [41402242]
- China Postdoctoral Science Foundation [2014M550460, 2015T80965]
- Ministry of Water Resources [201001008]
- Fundamental Research Funds for the Central Universities [450060501144]
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 phi 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.
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