论文部分内容阅读
The classic Engelund bed-load formula involves four oversimplified assumptions concerning the quantity of particles per unit bed area that can be potentially entrained into motion,the probability of sediment being entrained into motion at a given instant,the mean velocity of bed-load motion,and the dimensionless incipient shear stress.These four aspects are reexamined in the light of new findings in hydrodynamics,and a modified bed-load formula is then proposed.The modified formula shows promise as being reliable in predicting bed-load transport rates in a wide range of flow intensities.
The classic Engelund bed-load formula involves four oversimplified assembly. The amount of particles per unit bed area that can be potentially entrained into motion, the probability of sediment being entrained into motion at a given instant, the mean velocity of bed-load motion, and the dimensionless incipient shear stress. these four aspects are reexamined in the light of new findings in hydrodynamics, and a modified bed-load formula is then proposed. The modified formula shows promise as being reliable in predicting bed-load transport rates in a wide range of flow intensities.