NAME

i.eb.h_SEBAL01 - computation of sensible heat flux [W/m2] after Bastiaanssen, 1995 in [1], used in this form in 2001 by [2]. Implemented in this code in [3].

DESCRIPTION

i.eb.h_SEBAL01 will calculate the sensible heat flux map (h0), given both maps of Net Radiation and soil Heat flux (Rn, g0) at instantaneous time, the surface roughness (z0m), a map of the altitude corrected temperature (t0dem), a point data of the frictional velocity (u*), a value of actual vapour pressure (ea[KPa]) and the (x,y) pairs for wet and dry pixels. Full process will need those:

(for time integration: i.evapo.time_integration)

For more details on the algorithms see [1][2][3].

OPTIONS

NOTES

- z0m can be alculated by i.eb.z0m or i.eb.z0m0 (grass-addons). - ea can be calculated with standard meteorological data. eoTmin=0.6108*EXP(17.27*Tmin/(Tmin+237.3)) eoTmax=0.6108*EXP(17.27*Tmax/(Tmax+237.3)) ea=(RH/100)/((eoTmin+eoTmax)/2) - t0dem = surface temperature + (altitude * 0.627 / 100)

SEE ALSO

REFERENCES

[1] Bastiaanssen, W.G.M., 1995. Estimation of Land surface paramters by remote sensing under clear-sky conditions. PhD thesis, Wageningen University, Wageningen, The Netherlands.

[2] Chemin Y., Alexandridis T.A., 2001. Improving spatial resolution of ET seasonal for irrigated rice in Zhanghe, China}''. Asian Journal of Geoinformatics. 5(1):3-11,2004.

[3] Alexandridis T.K., Cherif I., Chemin Y., Silleos N.G., Stavrinos E., Zalidis G.C. Integrated methodology for estimating water use in Mediterranean agricultural areas. Remote Sensing, 1(3):445-465, 2009.

AUTHORS


Yann Chemin, International Rice Research Institute, Los Banos, The Philippines.

Contact: Yann chemin

Last changed: $Date: 2010-10-20 18:15:13 -0700 (Wed, 20 Oct 2010) $