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Experimental study on sedimentation of suspended particles in rain flood
Author(s): 
Pages: 60-64+98
Year: Issue:  9
Journal: Geotechnical Investigation & Surveying

Keyword:  rain floodartificial rechargephysical cloggingremoval of suspended solids;
Abstract: The groundwater recharging efficiency will be decreased significantly due to aquifer clogged by the suspended particles in the water when recharging with rain flood.In this paper,based of field investigation and sampling,the sedimentation experiment is conducted using riverbed sediments to evaluate the impact of particle diameter,particle concentration and ambient temperature on the particle removal.The results shows that particles greater than 18.1μm could be removed effectively when sedimentation velocity is 1m /h.At the same sedimentation velocity,the removal rate is 67.7% and 81.3% with the initial concentration of 115 mg /L and 516 mg /L respectively.Increasing temperature could accelerate the sedimentation.However,it has little impact with the temperature ranging from 8℃ to 50℃ on the removal of particles less than 7μm when sedimentation velocity is 0.33 m /h.The study results could provide theoretical and technological support for the pretreatment of rain flood in the process of groundwater recharge.
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