Modelling percolation of water. Calibration and validation of CREAMS and LEACHW codes in differents soils and forage crops [Piedmont - Sardinia - Tuscany]
1997
Acutis, M. | Cavallero, A. | Ducco, G. | Grignani, C. | Pardini, A. (Turin Univ. (Italy). Dipartimento di Agronomia, Selvicoltura e Gestione del Territorio) | Argenti, G. | Talamucci, P. | Zanchi, C. (Florence Univ. (Italy). Dipartimento di Agronomia e Produzioni Erbacee) | Caredda, S. (Sassari Univ. (Italy). Istituto di Agronomia Generale e Coltivazioni Erbacee) | Fara, G. | Porqueddu, C. | Sulas, L. (Consiglio Nazionale delle Ricerche, Sassari (Italy). Centro di Studio sui Pascoli Mediterranei)
CREAMS (capacitance type approach) and LEACHW (Richard's equation approach) codes have been validated and calibrated in three Italian environments (Piedmont, Tuscany and Sardinia), using 4 types of soil ranging from sandy-loam to clay-loam. A set of large drainage lysimeters has been used to obtain percolation data. In all sites one lysimeter was cropped with lucerne, while the others were cropped with widespread crops in the area (maize for silage in Piedmont, double cropping (italian ryegrass-maize for grain) in Sardinia and permanent pasture in Tuscany and Sardinia). Measured percolation ranged from 100 to 300 mm y** (-1). Lysimeters cropped with lucerne were used for calibration and the others for validation. The parameters used for calibrating the models have been the field capacity for the CREAMS model and the values of a and b of the Campbell moisture-pressure relation for LEACHW. CREAMS model showed good performance only in calibration (RMSE 50 mm), but not in validation, LEACHW showed better performance in calibration as well as in validation (RMSE 30 mm). Using parameters estimated from other data more easily available (particle distribution size, bulk density and organic matter content), an acceptable simulation has been obtained only in Tuscany
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