Size Characteristics of Debris Flow Deposition

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by Huilin Zhao, Chinese Acad of Sciences and, Ministry of Water Conservancy, Sichuan, China,
Yingyan Chen, Chinese Acad of Sciences and, Ministry of Water Conservancy, Sichuan, China,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering:

Abstract: The size distribution of debris flow deposition is extremely wide which may contain nearly all particles from clay and colloid to boulder. Particle size and composition have very important influence on the formation, transport and deposition of debris flow. Especially, the clay and colloid particles have direct relation to physical properties and structure of debris flow. For this reason, size analysis is a kind of important means and method of studying debris flow deposition. In this paper, on the foundation of lots of experiments on the size composition of debris flow deposition, till and river sedimentary samples, which were taken from Sichuan province, Yunnan province, and Gansu province in China, are compared and discussed. Their size parameters, such as: size mean value X¯, standard deviation σφ, skewness Sk and kurtosis K, and the dispersive point graphs of the size parameters are presented. The research results above show that the size characteristics of debris flow deposition are different from till and river deposition, since they have different transport way and flow properties.

Subject Headings: Solids flow | Debris | Material properties | Soil properties | Colloids | Rivers and streams | Particle size distribution | River flow | China | Asia | Yunnan | Sichuan | Gansu

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