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Titel |
Consistency between hydrological model, large aperture scintillometer and remote sensing based evapotranspiration estimates for a heterogeneous catchment |
VerfasserIn |
B. Samain, G. W. H. Simons, M. P. Voogt, W. Defloor, N.-J. Bink, V. R. N. Pauwels |
Medientyp |
Artikel
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Sprache |
Englisch
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ISSN |
1027-5606
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Digitales Dokument |
URL |
Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 7 ; Nr. 16, no. 7 (2012-07-13), S.2095-2107 |
Datensatznummer |
250013367
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Publikation (Nr.) |
copernicus.org/hess-16-2095-2012.pdf |
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Zusammenfassung |
The catchment averaged actual evapotranspiration rate is a hydrologic model
variable that is difficult to quantify. Evapotranspiration rates – up till
present – cannot be continuously observed at the catchment scale.
The objective of this paper is to estimate the evapotranspiration rates (or
its energy equivalent, the latent heat fluxes LE) for a heterogeneous
catchment of 102.3 km2 in Belgium using three fundamentally different
algorithms.
One possible manner to observe this variable could be the continuous
measurement of sensible heat fluxes (H) across large distances (in the
order of kilometers) using a large aperture scintillometer (LAS), and
converting these observations into evapotranspiration rates. Latent heat
fluxes are obtained through the energy balance equation using a series of
sensible heat fluxes measured with a LAS over a distance of 9.5 km in
the catchment, and point measurements of net radiation (Rn) and ground
heat flux (G) upscaled to catchment average through the use of TOPLATS, a
physically based land surface model.
The resulting LE-values are then compared to results from the remote
sensing based surface energy balance algorithm ETLook and the land surface
model. Firstly, the performance of ETLook for the energy balance terms has
been assessed at the point scale and at the catchment scale. Secondly,
consistency between daily evapotranspiration rates from ETLook, TOPLATS and
LAS is shown. |
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