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Sensitivity analysis of the evaporation module of the E-DiGOR model - page 9 / 11

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M. AYDIN, S. F. KEÇECİOĞLU

  • -

    1.00E+05

0

Air-dry water potential (cm of water)

  • -

    4.00E+05

  • -

    7.00E+05

  • -

    1.00E+06

  • -

    1.30E+06

Sensitivity coecients

  • -

    3

  • -

    6

  • -

    9

  • -

    12

  • -

    15

  • -

    1.60E+06

  • -

    18

1

31

61

91 Days of Year

121

151

181

1

31

61

91 121 Days of Year

151

181

Figure 4. Predicted water potential at air-dryness, ψad, and the relative sensitivity of |ψad| to air-humidity in Adana during the rst-half of 2006.

Table 2. Relative sensitivity coefficients and their confidence limits for input variables in the equations used.

Input variables

Mean sensitivity coefficients

Confidence limits (**P < 0.01)

lower boundary

upper boundary

For the output (Ep) of the Penman-Monteith equation

0.82

0.78

0.86

–0.02

–0.05

0.01

0.11

0.07

0.15

0.24

0.19

0.29

–0.24

–0.29

–0.19

Rn G s ra δ

For the output (Ea) of Aydın’s equation

|ψ| |ψad| |ψtp| Ep

Ep θfc θad α Dav

Hr T

–0.19 0.46 0.11 1.0

–0.23 0.25

For |ψ| from Aydın and Uygur’s equation

0.25 –1.17 1.17 –1.00 –0.50

0.16

  • 4.11

1.00

For |ψad| from Kelvin’s equation

  • 4.67

  • 0.15

0.67

0.34

  • 3.55

505

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