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sur le développement des zones arides et semi-arides

Titre : Simplified soil hydraulic characterization methods for large-scale agro-hydrological simulations : assessment of the TDR-2D-Mod method

Auteur : Zerrougi Meriem

Etablissement de soutenance : Istituto Agronomico Mediterraneo di Bari (IAMB) - Centre international de hautes études agronomiques méditerranéennes (CIHEAM)

Grade : Master of science Sustainable water and land management in agriculture ; 2022

Résumé
Knowledge of soil hydraulic properties is crucial to use agro-hydrological models in planning proper irrigation management. Unfortunately, these inputs are often not available, and their measurement is time-consuming. Hence, it is attractive to identify an expeditious method which predicts them at multiple field locations within a short time. Accordingly, the main aim of the study was to validate a simplified method for soil hydraulic characterization called TDR-2Dmod using a large database of soil hydraulic parameters obtained from 19 Sectors belonging to District 10 of Capitanata Consortium (Apulia Region, Italy). TDR-2Dmod integrates Time Domain Reflectometry (TDR) measurements and 2D modeling of water content distribution and dynamics within the wetted bulb under drippers based on Richards’ equation. The goodness of the hydraulic properties estimated by TDR-2Dmod was assessed by comparing them to the measurements obtained by classical Tension Infiltrometer Method (TIM method) performing a statistical t-test and sensitivity analysis. The main results showed no significant differences. This was confirmed by running numerical simulations of some selected functional properties with parameters obtained using alternatively data obtained by the proposed methodology and those coming from TIM method. The inversion procedure related to TDR-2D modeling and used to deduce the hydraulic parameters is especially sensitive to the parameter αGRD and K0 in the Gardner-Russo model for water hydraulic properties

Mots clés : 2D MODELING INVERSE METHOD, DRIPPER SOIL HYDRAULIC PROPERTIES TENSION INFILTROMETER (TIM) TIME DOMAIN REFLECTOMETRY (TDR)

Présentation (IAMB Library)