Wettability pressure/saturation relationships

Mafiiematical models of DNAPL subsurface movement require capillary pressure/saturation and relative permeability/saturation constitutive relationships for DNAPL/water/soil systems. Wettability alterations may have a considerable effect on ciqiillary pressure/saturation relationships as discussed in the previous section. They may also have an intact on relative permeability/saturation relationships yet this has received less attention in file literature in large part due to file experimental difficulties associated with measuring these relationships. 

Predictive models based on the capillary pressure/saturation relationships are commonly used to estimate relative permeability in the absence of experimental data 37, 38). One such predictive model, that of Bradford et al. 37), is used in Figure 6 to illustrate the effects of varying wettability on relative... 

Figure 4. The relationship of saturation states used for the Amott wettability indices or Amott-Harvey Relative Displacement Index to capillary pressure. ASws is the saturation change from a to b. ASw is the saturation change from b to c. ASos is the saturation change from c to d. ASof is the saturation change from d to a.

---