DETACHING MECHANISM OF GRAVEL DEPOSITED ON CLAYBED AND EFFECT OF COHESION ON IT

Abstract

 Rivers with exposed cohesive materials present disaster and environmental concerns. Therefore, it is necessary to understand the phenomenon of gravel deposition and detachment on clay river beds. In this study, we calculated the pick-up rate and adhesive force. The results showed that the larger the bottom friction force is, and the value of the pick-up rate tends to be larger. In addition, the adhesive force shown by the tensile test was within the range of the adhesive force obtained from the force balance in the gravel attached to clay river beds. This suggests that it is possible to obtain the conditions for the detachment of gravel attached to clay river beds from the characteristic values of clay obtained from the tensile test.