Study on vertical velocity distribution characteristics of fluid mud layer in reservoir area
Fluid mud in large reservoirs is a near-bottom layer of water body with higher sediment concentration and strong liquidity and directly affects the sedimentation morphology and the sediment discharging of the reservoir.Studying its movement law is of great significance to achieve the optimal operation of reservoir sedimentation reduction.According to the measurement of mud mineral composition and size grades in the Three Gorges Reservoir area,sediment samples were configured for mud rheological t tests,and a power-law rheological model was used to describe the constitutive relationship of fluid mud.A theoretical model for velocity distribution of fluid mud movement was constructed,and the model was verified through flume experiment.The calculation results are in good agreement with the experimental results.The study results show that the velocity of fluid mud increases with the increase of its thickness,upper water flow velocity,and bed slope,but decreases with the increase of fluid mud density.The vertical velocity distribution of the fluid mud always follows a parabolic shape.The velocity of fluid mud on the surface is much greater than that on the bottom,and the longitudinal velocity continuously decreases in the vertical direction,the bottom fluid mud is almost at a standstill.
rheological propertiespower law modelfluid mud densitybed slopefluid mud movement char-acteristics
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