Experimental Study on Sediment Settling of Xiaolangdi Reservoir

摘要

Sediment settling velocity is an important parameter in particle suspension and indispensable link of hyperconcentrated flow as well as basic theory support for efficient sediment transport of Xiaolangdi Reservoir.This paper has adopted current sediment sample in Xiaolangdi Reservoir to take still water settling experiment,observed carefully silt sediment distribution during different settling duration under various initial concentrations,analyzed common settling velocity calculation method,and adopted settling duration curve method as calculation method to obtain a constant settling velocity of free settling section.Typical settling velocity that is obtained from experiments makes supplement and fitness to settling velocity formula of the existing groups of sediment sample,amends the formula coefficient,further explore the settling characteristics and settling velocity of fine particle mixed viscous sediment with water concentration change,and meanwhile this paper researched settling distance impact on settling velocity,existing sediment group settling transition to mesh settling critical transition silt concentration of Xiaolangdi Reservoir.This paper has analyzed the relationship between settling velocity of muddy surface and settling velocity of mixed sediment group,and discussed silt concentration change trend with time of the muddy water below the muddy surface after settling.