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Cornell University (1992)

Irrigation management optimization incorporating equity and crop simulation

Buydens, Walter Joseph Rachel

Titre : Irrigation management optimization incorporating equity and crop simulation

Auteur : Buydens, Walter Joseph Rachel

Université de soutenance : Cornell University

Grade : Doctor of Philosophy (PhD) 1992

A series of models were integrated to optimize irrigation management under polyculture with multiple decision makers in the semi-arid regions of low-income countries. The model focussed in particular on medium-sized public irrigation systems situated in regions with a distinct rainy season. The use of an explanatory crop growth simulator was studied to derive deficit irrigation strategies for various crops and soil types. Pre-emergence irrigation requirements considered the estimation of by-pass flow. The optimization model was formulated as a large scale linear programming model. In the modeled system, the decision makers consist of a central policy maker on the one hand, and a heterogeneous group of farmers on the other hand. The model was formulated as a Cournot-von Stackelberg model where the government plays the role of the leader and the farmers that of the followers. The presented model incorporated the twin objectives of productivity and equity. The simulation-optimization model was applied to study improved irrigation management for the Sina project in Maharashtra, India. The decision makers considered were the farmers, the farmers’ associations, the government and the irrigation manager. Four equity scenarios were proposed based on project productivity, food security, and on per area and per capita equivalent water allocations. The WOFOST-IRRI crop simulator was successfully calibrated and validated in the context of limited field data. By-pass flow was derived from laboratory experiments and found to be very significant at the onset of the hot weather and kharif seasons. 972 irrigation strategies were subsequently simulated based on crop and soil type, starting date, and irrigation amount and timing. The results of the LP model outperformed current practices in terms of area irrigation per unit of water by as much as 264%. The recommended LP policy further indicated a potential improvement of 73% in terms of net project revenue compared to what is currently attainable. Equity was best achieved in the per capita equivalence scenario. For all equity scenarios, the most important source of inequity was holding size, followed by geographical location and soil type.

Mots clés : Agriculture, Applied sciences, Biological sciences, Civil engineering, Sina project, India

Annonce (WorldCat)

Page publiée le 13 avril 2015, mise à jour le 26 décembre 2018