Development of an Operation Model for Intake Flow Size Control of Irrigation Water Using Fuzzy Set Theory

Abstract

An operation model is developed to control flow size of irrigation water by combining two sub-models. These are: Sub-model 1 to determine the necessity of changing the flow size using the Hayashi's “Quant 2” theory; and Sub-model 2 to determine the magnitude of the necessary change in flow size using the fuzzy set theory. A parameterization technique is applied for deriving the production rule tables in Sub-model 2. This operation model is named as integrated operation model to be applied to the decision-making process for controlling intake flow size of irrigation water. An application example demonstrates the validity of this integrated model. The model performance is improved when threshold values for decision indicators are introduced.