Study on the Optimal Irrigation Method for Wind Erosion Prevention by the Simulation

概要

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One of the usual methods to prevent wind erosion is to sustain humidity of the soil surface by irrigating the soil. However, there have been no such specific methods defined in agricultural engineering. To define a concrete standard of preventing wind erosion, several irrigation methods, applying various irrigation intervals and water amounts, had been simulated by using a model to predict soil moisture dynamics under weather changes and irrigation events, from a case study of Oku-Nakayama upland in Iwate Prefecture. As a result of the simulation, it was found that applying usual intermittent irrigation, which requires shorten irrigation intervals, is not practical to prevent wind erosion due to the causes of frequent irrigation application and increased water requirement. On the other hand, timely irrigation to apply sufficient water when the soil fairly dehydrated contributes to effective prevention of wind erosion decreasing both irrigation intervals and water requirements. Although considering sprinkled water is susceptible to wind, this method was verified that the applying timely irrigation water is practicable to protect soil surface from wind, supposing enough irrigation facility capacity is substantially secured. Moreover, it was estimated additional capacity of irrigation facility for design adopted the function for preventing wind erosion under this method.
公益社団法人農業農村工学会の論文