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Estimation of evapotranspiration using advection aridity approach

Shifa, Yesrib Bahiru (2011) Estimation of evapotranspiration using advection aridity approach.

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Abstract:The AA model was tested with both daily and half hourly data for the relatively wet and dry condition in Sardon, Spain. The wind function which was applied to the AA model was standard, measured and empirically calibrated. Those three wind function validated by both measured eddy tower evapotranspiration and complementary relationships, which is the bases for AA model. The daily result shows that for relatively wet conditions of integrated wind function of standard, measured and calibrated into advection aridity (AA) model is in a good agreement with actual evapotranspiration (ET). However for dry the only was calibrated AA model, but less efficient compared to wet condition of those three wind function. The statistics of standard and measured AA model in dry condition shows that the RMSE (root mean square error) were 0.95 mm/day and 1.5 mm/day, respectively. Under dry condition, both standard and measured AA model overestimated. By mid of the May to mid of June, the standard estimates 46% higher than the eddy tower measured ET. The measured wind function estimates two times higher than the actual eddy tower ET. The calibrated AA model in dry condition was better than the preceding overestimated standard and measured wind functions. The RMSE was 0.68 mm/day and the trend was evaluated in a good agreement with the complementary relationship. For the higher temporal resolution, the half hourly AA model increases the discrepancy and shows no clear complementary relationship trend between the standardized actual ET and Potential ET.
Item Type:Essay (Master)
Faculty:ITC: Faculty of Geo-information Science and Earth Observation
Programme:Geoinformation Science and Earth Observation MSc (75014)
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