Effect of water temperature on physical clogging ofcoastal heterogeneous layer during artificial recharge
Artificial recharge is easy to cause clogging in coastal strata.The temperature of recharge wa-ter and the heterogeneity of porous media are important influencing factors for physical clogging.In this paper,by changing the particle gradation of porous media to simulate heterogeneous layers with different permeability,constant head seepage experiments were carried out to explore the spatio-tempo-ral evolution law of permeability coefficient of heterogeneous porous media under the condition of 10～25 ℃ recharge,and to quantitatively analyze the sedimentary distribution characteristics of suspended particles in porous media,and to reveal the influence of water temperature and aquifer heterogeneity on the physical blockage of coastal strata.The results showed that the effect of water temperature on the clogging process of particles in porous media was limited by the heterogeneity of the media,and there existed a critical value of coefficient of uniformity.When the coefficient of uniformity was below the critical value,the clogging rate increaseed with the increase of the temperature of recharge water.When the coefficient of uniformity was higher than the critical value,the water temperature had little effect on the physical clogging of porous media.Under constant temperature of recharge water,the lar-ger the coefficient of uniformity of porous media was,the more serious of the surface clogging.The re-sults can provide scientific basis for preventing physical clogging of coastal aquifer.
temperaturecoefficient of uniformitysuspended particlesporous media
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