Quantify the Pore Water Velocity Distribution by a Celerity Function

Figure 4

Breakthrough curves and the piston-shaped breakthrough curves under the unit hydraulic gradient condition for 5 typical saturated soils in (a) the Brook-Corey model, (b) the unmodified Mualem-van Genuchten model, and (c) the modified Mualem-van Genuchten model.