It is well known that muds exposed to fluid stressing are eroded, and is very important to understand the mechanism of mud layer erosion for the fluctuation of water quality. The patterns of mud surface affected with the flow are classified in longitudinal rectilinear grooves, linguoid ripple mark as internal wave, parting-step lineations and current ripple. These patterns are controlled by the shear resistance of muds in triaxial compression to frictional and cohesive properties, effective stress, soil structure, rate of strain, and temperature. And velocity and shear stress are often used interchangeably in erosion studies.
Data are presented showing that the activation energy is directly proportional to water content, mobility of strainrate superposed on the expanded Ostwald fluidity curve and the number of interparticle contacts per unit area of mud cross section. For the activation energy of contact on the interparticle is concerned with the cohesion of mud layer, this parameter isintroducedintothe basic factors to explain the fluidity, surface patern and eroded mud quantity. Consequently, the mud fluidity is synthetically explained by the microscopic activation energy of interparticle, and by the dimensions of macroscopic hysteresis loop signified internal friction energy.
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