Flow Laws for Glacier Ice: Comparison of Numerical Predictions and Field Measurements

Discussion has mainly focussed on the values of the rate various physical properties such as crystal size, ice fabric, and impurity content have been measured along the length of the core (Hammer and others, 1985; Herron and others, 1985). The bore hole itself has been studied for tilting and closure rates (Gundestrup and Hansen, 1984). In addition, there are three sets of ice-sounding radar surveys (Overgaard and Gundestrup, 1985; Jezek and others, 1985a; Fisher and others, 1989), as well as measurements of surface slopes and strain-rates at the surface (Whillans and others, 1984). Taken together, these data allow us to apply the newly refined force-budget technique (Van der Veen, 1989; Van der Veen and Whillans, 1989a) to determine how well different suggested constitutive relations apply to the flow near Dye 3. This is the subject of the present contribution.