Application of Graphic and Moment Methods on the Analysis of Particle Sizes of Dam-break Accumulations by Xuelongnang Ancient Landslide Lake in the Upper Jinsha River

Abstract

Abstract:

According to field investigation and laboratory analysis, grain-size parameters of 50 samples from dam-break accumulations by Xuelongnang ancient landslide in the upper Jinsha River are calculated using graphic and moment methods, and the results are compared. The results show that the average particle size of the three sections,i.e. the upstream, the midstream and the downstream of the dam-break accumulation obtained by the two methods is highly correlated, and the correlation coefficients are 0.948, 0.994, and 0.991, respectively; the correlation coefficients of sorting are 0.824, 0.959 and 0.901, respectively. The results show that the average particle size obtained by the two methods are basically equal and can be replaced by each other. Except the large deviation of the upstream section, the separation coefficients of the other two sections are equal and can be replaced by each other. For the whole dam accumulation body, skewness and kurtosis are more discrete with poor correlation. For the dam-break accumulations, it is recommended that the moment method be optimized to calculate the particle size parameters, which can comprehensively cover the information of the sample and can reflect the environmental change of the dynamic water condition during the whole process. The differences between the result of this study and that of previous studies on other types of sediments are mainly due to the distribution of grain size components, the dynamic condition of deposition and the sedimentary environment.

Key words: graphic method, moment method, grain-size parameter, upper Jinsha River, dam-break accumulation

CLC Number:

P642.2

CHEN Song, CHEN Jian, QIAO Chunsheng, MA Junxue, LIU Chao. Application of Graphic and Moment Methods on the Analysis of Particle Sizes of Dam-break Accumulations by Xuelongnang Ancient Landslide Lake in the Upper Jinsha River[J]. Geoscience, 2017, 31(06): 1278-1283.

Figures/Tables 4

Fig.1 Geological map of the Xuelongnang-Wangdalong reach of the upper Jinsha River

Fig.2 Distribution of the dam-break accumulation induced by the Xuelongnang landslide-dammed lake

Fig.3 Particle size frequency curves of the upper, middle and lower reaches of the dam-break accumulation

Fig.4 Comparison of the grain size parameters of the dam-break accumulation body by the moment(ordinate) and graphical(abscissa) methods

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