Author(s): Zhong De-Yu; Liu Jin-Mei; Zhang Hong-Wu; Wang Guang-Qian
Linked Author(s):
Keywords: Suspended load; Entrainment rate; Probability density function; Turbulence burst
Abstract: Abstdract: A PDF (probability density function) model for entrainment rate of bed material into suspension is presented in this paper. The transport equation for PDF is introduced to obtain the statistical properties of sediment moving near the riverbed. Regarding the different effects of ejection and sweeping of turbulence burst on the movement of sediment, the entrainment rate is obtained. Since the distribution of the upward flux of sediment is derived, it permits to calculate the variation of the entrainment flux perpendicular to riverbed after sediment resting on bed surface is picked up. The reference concentration of suspended load is also obtained in this paper. Comparisons show that there is a satisfactory agreement between present model and observation.
Year: 2001