An experimental study on the determination of dispersion coefficient in layered soils

Abstract Dispersivity is a measurable parameter in soil porous media that used for studying the transport of contaminants to groundwater. The value this depends on various factors, including kind (homogeneous or heterogeneous), flow velocity, initial contaminant concentration, travel distance, and sampling method. A physical model with dimensions 0.10 m width, 0.80 height, 1.10 length was constructed investigate effects these parameters dispersivity value. stratified consisted three 20-cm-thick layers containing fine-grained, medium-grained, coarse-grained soil. Sodium chloride solutions electrical conductivity values 10, 14, 19 dS/m were as contaminants. Flow forced through layered heterogeneous soils at discharge velocities 17.58, 22.02, 26.18 × 10?5 m/s. point mixed methods used. results indicated homogeneous influenced by distance. Moreover, obtained lower than those using method, mean