The assessment of evapotranspiration (ET) is of primary interest,especially for agricultural and environmental issues. Traditional micrometeorological techniques require homogenous surface and are characterized by limited footprint. Thus, they cannot be applied to assess ET over inhomogeneous and extensive surfaces, typical conditions at the catchment scale and of extensive farming systems. In this context, a suitable technique to measure turbulent fluxes is scintillometry, which can give measurements of sensible heat flux at larger scale, providing averages over heterogeneous surfaces. ET can then be estimated as residual of the energy budget. In this study, we present results from a one-week campaign held during summer 2016 in Southern Italy. We deployed a Large Aperture Scintillometer (LAS) in an extensive vineyard of 140 ha on a path length of 760 m. The site was characterized by gently slope terrain with uniform crop. In order to have reference measurements of local sensible heat flux, we deployed threesonic anemometers along the scintillometer path. The aim of the study was to test the ability of scintillometry to provide a spatially averaged flux, representative of the possibly diverse conditions in an extended footprint upwind to the measurement path. The relationship between sensible heat flux measured by EC and LAS showed to be very good for the EC station in the middle of the path, whereas off-centre areas were less represented.

Scaling-up of evapotranspiration measurements: The promising role of scintillometry / Vendrame, N.; Tezza, L.; Pitacco, A.. - In: IOP CONFERENCE SERIES. EARTH AND ENVIRONMENTAL SCIENCE. - ISSN 1755-1315. - ELETTRONICO. - 275:(2019), pp. 012018.1-012018.4. ((Intervento presentato al convegno 1st Workshop on Metrology for Agriculture and Forestry, METROAGRIFOR tenutosi a Ancona nel 1st-2nd October 2018 [10.1088/1755-1315/275/1/012018].

Scaling-up of evapotranspiration measurements: The promising role of scintillometry

Vendrame N.;
2019

Abstract

The assessment of evapotranspiration (ET) is of primary interest,especially for agricultural and environmental issues. Traditional micrometeorological techniques require homogenous surface and are characterized by limited footprint. Thus, they cannot be applied to assess ET over inhomogeneous and extensive surfaces, typical conditions at the catchment scale and of extensive farming systems. In this context, a suitable technique to measure turbulent fluxes is scintillometry, which can give measurements of sensible heat flux at larger scale, providing averages over heterogeneous surfaces. ET can then be estimated as residual of the energy budget. In this study, we present results from a one-week campaign held during summer 2016 in Southern Italy. We deployed a Large Aperture Scintillometer (LAS) in an extensive vineyard of 140 ha on a path length of 760 m. The site was characterized by gently slope terrain with uniform crop. In order to have reference measurements of local sensible heat flux, we deployed threesonic anemometers along the scintillometer path. The aim of the study was to test the ability of scintillometry to provide a spatially averaged flux, representative of the possibly diverse conditions in an extended footprint upwind to the measurement path. The relationship between sensible heat flux measured by EC and LAS showed to be very good for the EC station in the middle of the path, whereas off-centre areas were less represented.
1st Workshop on Metrology for Agriculture and Forestry, METROAGRIFOR
Bristol
IOP Publishing
Vendrame, N.; Tezza, L.; Pitacco, A.
Scaling-up of evapotranspiration measurements: The promising role of scintillometry / Vendrame, N.; Tezza, L.; Pitacco, A.. - In: IOP CONFERENCE SERIES. EARTH AND ENVIRONMENTAL SCIENCE. - ISSN 1755-1315. - ELETTRONICO. - 275:(2019), pp. 012018.1-012018.4. ((Intervento presentato al convegno 1st Workshop on Metrology for Agriculture and Forestry, METROAGRIFOR tenutosi a Ancona nel 1st-2nd October 2018 [10.1088/1755-1315/275/1/012018].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11572/276962
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