Yuri NOMOTO
Low Flow Dam Operation Based on Flow Rate Prediction From Rainfall-Runoff Model
Minjiao LU
Purpose of the dam is not only flood control, water supply for agricultural water, tap water and power generation are also included. Usually dam is operated based on observed inflow. However, dam inflow can be predicted more and more accurately 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. In Sameura Dam basin, inflow was simulated using a lumped model, SFXAJ3 model. The parameter set was calibrated and used for simulation. Five operation rules are proposed. In sim1, using the preceding time to calculate the amount of water stored in the dam ahead and performs an operation that hasten the start water intake limit. In sim2, is allowed to change the water intake intended for ¡Èfutokuteisui¡É, and performs an operation to keep a lot of storage amount. In sim3, order to delay the more stringent restrictions, previously to perform loose restriction of water intake, and performs an operation providing a new standard. In sim4 and sim5, operation of sim3 and the intake amount intended for ¡Èfutokuteisui¡É is changed from the third-order intake limit, and performs an operation combining operation. Results of the verification operation showed the possibility to increase the length of water supply. In order to show the effectiveness of the operation rules, the elongated length of water supply period is compared to the length of non-rainfall period based on their non-exceedence probability.
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