The effect of background hydrometeorological conditions on the sensitivity of evapotranspiration to model parameters: Analysis with measurements from an Italian alpine catchment

Nicola Montaldo, Vania Toninelli, John D. Albertson, Marco Mancini, Peter A Troch

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Recent developments have made land-surface models (LSMs) more complex through the inclusion of more processes and controlling variables, increasing numbers of parameters and uncertainty in their estimates. To overcome these uncertainties, prior to applying a distributed LSM over the whole Toce basin (Italian Alps), a field campaign was carried out at an experimental plot within the basin before exploring the skill and parameter importance (sensitivity) using the TOPLATS model, an existing LSM. In the summer and autumn of 1999, which included both wet (atmosphere controlled) and dry (soil controlled) periods, actual evapotranspiration estimates were performed using Bowen ratio and, for a short period, eddy correlation methods. Measurements performed with the two methods are in good agreement. The calibrated LSM predicts actual evapotranspiration quite well over the whole observation period. A sensitivity analysis of the evapotranspiration to model parameters was performed through the global multivariate technique during both wet and dry periods of the campaign,. This approach studies the influence of each parameter without conditioning on certain values of the other variables. Hence, all parameters are varied simultaneously using, for instance, a uniform sampling strategy through a Monte Carlo simulation framework. The evapotranspiration is highly sensitive to the soil parameters, especially during wet periods. However, the evapotranspiration is also sensitive to some vegetation parameters and, during dry periods, wilting point is the most critical for evapotranspiration predictions. This result confirms the importance of correct representation of vegetation properties which, in water-limited conditions, control evapotranspiration.

Original languageEnglish (US)
Pages (from-to)848-861
Number of pages14
JournalHydrology and Earth System Sciences
Volume7
Issue number6
StatePublished - Dec 2003
Externally publishedYes

Fingerprint

evapotranspiration
catchment
land surface
wilting
Bowen ratio
vegetation
analysis
effect
parameter
basin
conditioning
sensitivity analysis
eddy
soil
autumn
atmosphere
sampling
summer
prediction
simulation

Keywords

  • Alpine basin
  • Eddy correlation
  • Evapotranspiration
  • Land surface model
  • Sensitivity analysis

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Water Science and Technology

Cite this

The effect of background hydrometeorological conditions on the sensitivity of evapotranspiration to model parameters : Analysis with measurements from an Italian alpine catchment. / Montaldo, Nicola; Toninelli, Vania; Albertson, John D.; Mancini, Marco; Troch, Peter A.

In: Hydrology and Earth System Sciences, Vol. 7, No. 6, 12.2003, p. 848-861.

Research output: Contribution to journalArticle

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