American Society of Civil Engineers

Optimizing Irrigation Management for Pollution Control and Sustainable Crop Yield

by G. R. Musharrafieh and R. C. Peralta

pp. 699-706

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Document type: Conference Proceeding Paper
Part of: Management of Irrigation and Drainage Systems: Integrated Perspectives
Abstract: We developed a simulation-optimization model which maximizes crop yield while maintaining target salt concentration in the root zone, and/or preventing salt from leaching to the groundwater. The model performs nonlinear optimization and simulation. Implicit finite difference forms of the nonlinear, transient, unsaturated water flow equation, and the convection-diffusion equation are embedded as constraints. Other constraints include nonlinear functions describing the hydraulic properties of the medium. The objectives of the management model is to develop irrigation strategies which prevent salt leaching to the groundwater when salty irrigation water is used. Five different irrigation strategies are developed for Huntington Research Farm, Utah, and are presented in this paper.

ASCE Subject Headings:
Irrigation systems
Irrigation water
Simulation models
Sustainable development
Soil pollution
Water pollution

Author Keywords:
Finite difference method - Groundwater - Leaching - Mathematical models - Optimization - Saline water - Salts - Water pollution control
Crop yield - Hunting Research Farm - Salt concentration - Water flow equation