Intraseasonal water allocation in deficit irrigation

作者：Rafael L. Bras, José R. Cordova · 发表于：Water Resources Research · 年份：1981 · DOI：10.1029/wr017i004p00866 · 被引用次数：104 · 研究领域：Water resources management and optimization、Hydrology and Drought Analysis、Irrigation Practices and Water Management

This paper is concerned with the optimal temporal allocation of irrigation water, taking into consideration the intraseasonal stochastic variation of the crop water requirements and the dynamics of the soil moisture depletion process. Expressions for the soil moisture transition probabilities over a given time period and the first two moments of associated actual evapotranspiration are derived analytically. The conditional probabilities of soil moisture and associated actual evapotranspiration are used within a stochastic dynamic programing (DP) algorithm with rewards being a function of cost and crop yield. The DP algorithm is used to determine optimal control policies at each irrigation decision point, conditional on the state of the system (soil moisture content). Both mean and variance of net benefits are computed. Analytic results are corroborated with a case study example.