柔らかい底泥の巻き上げ過程に関する研究
1988 年 1988 巻 393 号 p. 33-42
詳細
1988 年 1988 巻 393 号 p. 33-42
The erosional process of soft muds is studied experimentally and theoretically. Mud erosion is classified to three types according to water content of them. These characteristics are distinguished by the range of the slump value. The erosion tests of soft muds show that the critical shear stress of erosion τce is expressed as a function of solid fraction of muds at the surface layer and the initial erosional flux as a function of non-dimensional bed shear stress τ/τce-1. The erosional fluxes at constant shear stresses decrease in an hour after the start of experiment because of the hardening of muds by the shear deformation which accompanies the reorientation of mud particles.
On the basis of these experimental results, a model for the behaviour of muds is developed to simulate the erosional process. This model well describes the changes of suspended solids concentration and vertical distributions of solid fraction in uneroded remaining muds.
