Data di Pubblicazione:
2017
Citazione:
Improving estimates of evaporation with the "Bowen ratio" method / A. Comunian, M. Giudici, L. Landoni, S. Pugnaghi. ((Intervento presentato al convegno Numerical Modeling, Predictability and Data Assimilation in Weather, Ocean and Climate tenutosi a Bologna nel 2017.
Abstract:
The application of the Bowen ratio method to estimate evaporation is heavily affected by uncertainties on the measured quantities. Standard techniques of error propagation can
be used to reject, from a time series of hydro-meteorological variables, the measurements collected at time steps for which a reliable estimate of evaporation cannot be computed. However, simply discarding some values might introduce a bias in the cumulative evaporation for long time intervals, also depending on the threshold of acceptance. One solution is to use a direct sampling technique, based on multiple-point statistics simulation, to integrate the time series of reliable evaporation estimates. In this work we test the application of this technique on a two-years-long time series of data collected with a hydro-meteorological station located in the Po plain (Italy). In particular, we explore the impact that a different threshold of acceptance has on the final estimates of evapotranspiration. The results obtained up to date allow to evaluate the impact that a reject-only strategy has on the estimates of evaporation, and provide guidelines for the selection of reliable threshold of acceptance.
Tipologia IRIS:
14 - Intervento a convegno non pubblicato
Keywords:
evaporation; multiple-point statistics; data reconstruction; aquifer recharge
Elenco autori:
A. Comunian, M. Giudici, L. Landoni, S. Pugnaghi
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