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Accueil du site → Master → Pays Bas → 2011 → Simulation of operation of irrigation schemes in the Upper Blue Nile basin, Ethiopia : the case of Koga dam and irrigation scheme

UNESCO-IHE Institute for Water Education, Delft (2011)

Simulation of operation of irrigation schemes in the Upper Blue Nile basin, Ethiopia : the case of Koga dam and irrigation scheme

Asfaw, B.W.

Titre : Simulation of operation of irrigation schemes in the Upper Blue Nile basin, Ethiopia : the case of Koga dam and irrigation scheme

Auteur : Asfaw, B.W.

Université de soutenance : UNESCO-IHE Institute for Water Education, Delft

Grade : Master of Science (MS) 2011

Résumé
Modern Irrigation schemes throughout the world are generally seen to underperform due to lack of appropriate operation policies. Most irrigation schemes are dependent in one way or another on river flows. Some are built as simple diversions others have big reservoirs to store wet season flow of rivers for the dry season use. Whichever is the case the design is based on various assumptions made to come up with a suitable design that would function optimally under various river flow conditions. The water delivery network is often designed for peak flow conditions and yet expected to function under various demand scenarios. These and other factors typically make operating irrigation schemes much of a challenge. Reservoir operation needs careful decisions as releases made at a time could result in shortages on a later time due to uncertainties of future inflows. For decades various optimization and simulation models have been developed by different researchers and institutions to assist this decision making process. Yet the area remains a broad and active research theme to date. Developed optimization techniques or mathematical programs include Linear programming (LP) ; Non Linear Programming (NLP) ; Dynamic Programming (DP) ; Stochastic Dynamic Programming (SDP) ; and Heuristic programming such as Genetic algorithms, Shuffled Complex Evolution, Fuzzy logic, and Neural networks. While there are numerous simulation models including HEC ResSim 3.0, which is applied in this study. Rule curves are often developed for guiding optimal reservoir release through retrospectively studying hydrological river inflows and alternative reservoir release options. In this study Koga Reservoir of Koga Dam and Irrigation scheme and components of the primary canal water delivery system have been simulated using a reservoir simulation model and one dimensional unsteady state canal flow model respectively with the aim of recommending suitable operation policy. Estimating the scheme water demand and analysing hydrology of Koga River for low flows and their impact on the reliability, resilience and vulnerability of Koga Reservoir were main focus areas.

Sujets  : irrigation schemes Upper Blue Nile reservoir operations case studies Ethiopia

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