DESCRIPTION
i.eb.hsebal01 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:
- i.vi, i.albedo, r.latlong, i.emissivity
- i.evapo.potrad (GRASS Addon)
- i.eb.netrad, i.eb.soilheatflux, i.eb.hsebal01
- i.eb.evapfr, i.eb.eta
(for time integration: i.evapo.time_integration)
i.eb.hsebal01 performs the 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].
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
i.eb.soilheatflux,
i.eb.hsebal01,
i.eb.evapfr
REFERENCES
[1] Bastiaanssen, W.G.M., 1995.
Estimation of Land surface parameters by remote sensing under clear-sky
conditions. PhD thesis, Wageningen University, Wageningen, The Netherlands.
(PDF)
[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. 2009, 1, 445-465.
(PDF)
[4] Chemin, Y., 2012.
A Distributed Benchmarking Framework for Actual ET Models,
in: Irmak, A. (Ed.), Evapotranspiration - Remote Sensing and Modeling. InTech.
(PDF)
AUTHORS
Yann Chemin, International Rice Research Institute, Los Banos, The
Philippines.
Contact: Yann Chemin
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