Asako SAKAMOTO
Utilization of the Rainfall-Runoff Model in Dam Flood Control
Minjiao LU
Dam is operated based on observed inflow. However, dam inflow can be predicted from observed rainfall data by using a rainfall-runoff model. Predicted information of inflow is useful because more efficient operation will be decided at earlier time. In order to propose efficient dam operation and water resource management, new dam operation rules with predicted information of inflow were discussed in this study. Two rules were newly proposed to avoid "tadashigaki" operation. In Sameura Dam basin, inflow was simulated using a lumped model, SFXAJ3 model. The parameter set was calibrated and used for simulation. The validation using actual flood data showed that "tadashigaki" operation can be avoid and start time of "tadashigaki" operation can be delayed by using newly proposed dam operation rules. Simulated results for extreme flood showed that flood control without excess water release were conducted certainly by a method which releases difference between actual release rate and design maximum release rate. It is showed that necessity to evaluate the influence of rainfall prediction error in dam operation.
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