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Evapotranspiration Modelling in the High Andeans Zones of Peru Using Remote Sensing Techniques

Author(s): Cayo Ramos Taipe, Ulises Ccama Ticona

Linked Author(s): Cayo Ramos Taipe

Keywords: Evapotranspiration; SEBAL; Remote sensing; GIS; Satellite Imagery;

Abstract: In the last years, with the satellite technology coming, appears as a viable option to get evapotranspiration with a wide spatial and temporal coverage using multi- spectral images and the surface energy balance algorithm for land (SEBAL). It used satellite images Landsat 8 (sensors OLI and TIRS) that it was supplied free of charge by the United States Geological Survey (USGS) in total four images were used in the dates 06th, 22nd of July and 07th, 23rd of August of 2017. The study area is located in the central Andean zones of Peru, on the shores of Mantaro river between the coordinates UTM: 437, 147 to 483, 907 East and 8ˈ656, 061 to 8ˈ708, 330 North with an average height of of 3 297 meter above sea level. The results achieved through SEBAL are in the rank of 0.0 to 7.99 mm/day during the three assessed dates, those results were esteemed using datums from meteorological stations that are near to the study area where it was calculated the evapotranspiration using the Penman- Monteith equation that it was recommended by FAO so the result was a coefficient of determination (R²) of 0.91, a root- mean- square error (RMSE) of 0.36 mm/day and a Nash of 0.73 which proves the usage of multispectral satellite imagery and the application of the SEBAL algorithm give a good alternative to better understand the behavior of the evapotranspiration in a spatial and temporal level so it allows an appropriate and efficient usage of the water resources.

DOI: https://doi.org/10.3850/38WC092019-0126

Year: 2019

Source: Proceedings of the 38th IAHR World Congress (Panama)

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