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| Titel |
Estimation of catchment averaged sensible heat fluxes using a Large Aperture Scintillometer |
| VerfasserIn |
Bruno Samain, Bram Ferket, Willem Defloor, Valentijn Pauwels |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250052309
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| Zusammenfassung |
| Evapotranspiration rates at the catchment scale are very difficult to quantify. One possible
manner to continuously observe this variable could be the estimation of sensible heat
fluxes (H) across large distances (in the order of kilometers) using a Large Aperture
Scintillometer (LAS), and inverting these observations into evapotranspiration rates,
under the assumption that the LAS observations are representative for the entire
catchment.
The objective of this study is to assess whether measured sensible heat fluxes
from a LAS over a long distance (9.5 km) can be assumed to be valid for a 102.3
km2 heterogeneous catchment. Therefore, a fully process-based water and energy
balance model with a spatial resolution of 50 m has been thoroughly calibrated and
validated for the Bellebeek catchment in Belgium. A footprint analysis has been
performed.
In general, the sensible heat fluxes from the LAS compared well with the modeled
sensible heat fluxes within the footprint. Moreover, as the modeled H within the
footprint has been found to be almost equal to the modeled catchment averaged H,
it can be concluded that the scintillometer measurements over a distance of 9.5
km and an effective height of 68 m are representative for the entire catchment. |
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