HR: 14:40h
AN: C23B-05    [Abstracts]
TI: Water and Energy Balance Coupling at Low Temperature in the Hydrological Distributed Model GEOtop
AU: * Endrizzi, S
EM: stefano.endrizzi@unitn.it
AF: University of Trento, Dipartimento di Ingegneria Civile ed Ambientale/ CUDAM, Via Mesiano, 77, Trento, TN 38050 Italy
AU: Cordano, E
EM: ecor@diam.unige.it
AF: University of Trento, Dipartimento di Ingegneria Civile ed Ambientale/ CUDAM, Via Mesiano, 77, Trento, TN 38050 Italy
AU: Bertoldi, G
EM: bertoldi@duke.edu
AF: University of Trento, Dipartimento di Ingegneria Civile ed Ambientale/ CUDAM, Via Mesiano, 77, Trento, TN 38050 Italy
AU: Rigon, R
EM: riccardo.rigon@ing.unitn.it
AF: University of Trento, Dipartimento di Ingegneria Civile ed Ambientale/ CUDAM, Via Mesiano, 77, Trento, TN 38050 Italy
AB: GEOtop 0.875 is a distributed model with coupled water and energy budgets. This coupling is present in evapotranspiration, in hydraulic conductivity dependence on temperature of the soil, in snow-related modeling and in soil freezing processes [Rigon et al., 2005]. This contribution discusses the part of the model related to snow pack dynamics and freezing soil. A previous version of the snow module was discussed in Zanotti et al [2004] but the snow-pack modeling was recently improved to include multilayered snow and a treatment of the metamorphism evolution. Soil freezing was never present in previous versions of the model and this caused, among other anomalies in the energy budget, the well known phenomenon called overcooling of the soil. Because liquid water is still present in the ground even at several degrees below the freezing point, a further variable, which is related to the soil water and ice proportion, must be introduced in the model, and consequently an additional equation is required for the closure of the problem. Different simple closures have been adopted in the model on the basis of the work of Hansson et al. [2004] and compared to available data. Feedbacks of soil freezing treatment on snow pack temperature and evolution are also shown. A validation of the model in an Alpine watershed is presented.
DE: 0704 Seasonally frozen ground
DE: 1814 Energy budgets
DE: 1827 Glaciology (0736, 0776, 1863)
DE: 1847 Modeling
SC: Cryosphere [C]
MN: Fall Meeting 2005