PhD Thesis, 2007 - University College Cork
PhD Thesis, 2007 - University College Cork
PhD Thesis, 2007 - University College Cork
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Chapter 6<br />
Water and energy budgets<br />
2003<br />
2004<br />
2005<br />
2006<br />
Daily ET<br />
[mm]<br />
2<br />
1<br />
0<br />
apr jun aug<br />
2<br />
1<br />
0<br />
apr jun aug<br />
2<br />
1<br />
0<br />
apr jun aug<br />
2<br />
1<br />
0<br />
apr jun aug<br />
1<br />
1<br />
1<br />
1<br />
VPD [kPa]<br />
0.5<br />
0<br />
apr jun aug<br />
0.5<br />
0<br />
apr jun aug<br />
0.5<br />
0<br />
apr jun aug<br />
0.5<br />
0<br />
apr jun aug<br />
20<br />
20<br />
20<br />
20<br />
t air<br />
[°C]<br />
15<br />
10<br />
15<br />
10<br />
15<br />
10<br />
15<br />
10<br />
apr jun aug<br />
apr jun aug<br />
apr jun aug<br />
apr jun aug<br />
R n<br />
[W m -1 ]<br />
300<br />
200<br />
100<br />
0<br />
apr jun aug<br />
300<br />
200<br />
100<br />
0<br />
apr jun aug<br />
300<br />
200<br />
100<br />
Month of the year<br />
0<br />
apr jun aug<br />
300<br />
200<br />
100<br />
0<br />
apr jun aug<br />
Figure 6.8. Daily (averaged over 7 days) ET and daily means (averaged over 7<br />
days) of VPD, T air and R n during the growing season (April-September) in 2003,<br />
2004, 2005 and 2006.<br />
6.5.4 Evapotranspiration mechanism<br />
Evapotranspiration had an interannual variability, ranging from a low of 357 mm in<br />
2005/06 to a high of 406 mm in 2003/04. In Figure 6.9a we show the daily ET<br />
relative to the depth of the water table below the surface of the low lawn<br />
vegetation. This suggests no clear dependence of ET on water table depth. Besides<br />
we note in Figure 6.9b that the mean ratio of daily ET/PET is almost constant at ca.<br />
0.45 for all water table depths.<br />
97
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