6
SURF2
GAWSER SURF2
4
2
0
10
20
30
40
50
60
70
80
90
Time (h)
Figure 40. Behavior of runoff. SURF2 and GAWSER_SURF2 exhibit the same pat-
tern, but differ slightly in magnitude in that SURF2 is slightly larger than
GAWSER_SURF2. Object-GAWSER predicts more surface runoff because it predicts
less infiltration than the Fortran version of GAWSER (see Fig. 37).
and GAWSER_F (Fig. 37) because SURF2 represents the rainfall and snowmelt that does not infil-
trate. Therefore, Object-GAWSER should predict more surface runoff because it predicts slightly less
infiltration. The first peak of SURF2 and GAWSER SURF2 are identical because IMCa, rather than
0.00001 was used for the initial value of TINF.
Figure 41 shows the behavior of SURF2 and GAWSER_SURF2 when 0.00001 is used as the initial
condition for TINF. The two curves behave identically to those shown in Figure 40 except at 45 hours.
Both SURF2 and GAWSER_SURF2 peak identically at 45 hours in Figure 41. At 45 hours in Figure
42, SURF2 is increasing while GAWSER_SURF2 is peaking.
Figure 42 shows the differences and similarities between E and GAWSER_E. The two curves are
identical until shortly before 45 hours after which GAWSER_E becomes slightly larger than E (and
6
SURF2
GAWSER SURF2
4
2
0
10
20
30
40
50
60
70
80
90
Time (h)
Figure 41. Behavior of runoff using a different initial value for TINF. When using
an initial value of 0.00001 for TINF (instead of 0.48, the adjusted initial moisture
content of the top soil layer), SURF2 and GAWSER_SURF2 do not peak together at
45 hours as is shown in Figure 40. After 45 hours, the behavior of SURF2 and
GAWSER_SURF2 is the same as is shown in Figure 40.
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