An international research team consisting of Associate Professor Koichi Unami of the Graduate School of Agriculture, Kyoto University and Professor Osama Mohawesh of the Faculty of Agriculture, Muta University (Jordan) has set up and put into operation a system to convert floods into irrigation water in arid regions of Jordan. It started.

 In the arid regions of the world, including the Middle East and North Africa, there is too much dependence on foreign rivers and fossil groundwater, and problems such as salt accumulation have become apparent.On the other hand, the reality is that the damage caused by sudden floods is expanding, and an irrigation system to deal with these problems has been sought.

 This time, the team proposed a system to collect desert floods, store them in reservoirs, and convert the water into irrigation water, and actually built a prototype in the arid regions of Jordan.In small reservoirs such as reservoirs in Japan, rule curves (management target water levels that limit water intake) are often set based on experience points.In the reservoir of this study, we optimized the management of the rule curve of the reservoir based on a strict mathematical basis by using the concept of a certain PDE.By using this mathematical concept, it has become possible to handle optimal operation strategies for movements such as switching between pump start / stop.

 The methodology for deriving the optimal management method for reservoirs based on dynamic programming has been known for a long time, but this study is the world's first example of actual application and verification of a reservoir for converting desert floods into irrigation water. Is an example of.

Paper information:[Stochastic Environmental Research and Risk Assessment] A unique value function for an optimal control problem of irrigation water intake from a reservoir harvesting flash floods

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