A Study on Forming Mechanism of the Bedding Structure of the Gravel Accumulated at Surface, and Rough Bedding Structure in Deposits of Viscous Debris Flows with Hyperconcentration

WANG Yu-yi; JAN Chyan-deng; HAN Wen-liang; ZOU Ren-yuan

According to observational data of viscous debris flows with hyper-concentration , distinct causes of formation for different graded bedding in debris flow deposits have been analyzed by use of its rheology and the ratio of flow plug . The paper specially analyzed that the gravel in squirm condition of hyper-concentration viscous flows would tend to have vertical motion due to the effect of Weissenberg , then they would form the bedding structure of the gravel accumulated at surface, and they are different from rough bedding structure.

1. Chengdu Institute of Mountain hazards, & Environment ,CAS, Dongchuan Debris Flow Observation & Research Station, CAS,Chengdu 610041;

2. Department of Hydraulics & Ocean engineering, Cheng Kung University, Tainan 70101;

3. Department of Hydraulics Engineering, Tsinghua University, Beijing 100084;

4. Chengdu Institute of Mountain hazards & Environment, CAS ,Chengdu 610041

Received Date: 2002-02-15

Rev Recd Date: 2002-04-08

Publish Date: 2003-06-10

Key words:

Abstract: According to observational data of viscous debris flows with hyper-concentration , distinct causes of formation for different graded bedding in debris flow deposits have been analyzed by use of its rheology and the ratio of flow plug . The paper specially analyzed that the gravel in squirm condition of hyper-concentration viscous flows would tend to have vertical motion due to the effect of Weissenberg , then they would form the bedding structure of the gravel accumulated at surface, and they are different from rough bedding structure.

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A Study on Forming Mechanism of the Bedding Structure of the Gravel Accumulated at Surface, and Rough Bedding Structure in Deposits of Viscous Debris Flows with Hyperconcentration

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