Study on canal feedforward control time based on constant water volume
FAN Yumiao 1,2, GAO Zhanyi1*, CHEN Haorui1, WANG Shaoli1, CHANG Hui3
1.China Institute of Water Resources and Hydropower Research, Beijing 100038, China; 2.College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China; 3.Jiamakou Irrigation District Administration Bureau, Yuncheng, Shanxi 044031, China
In order to study feedforward control time of canal buildings during canal operation, influences of upstream and outlet regulations on downstream water volume were considered. A constant water volume method was used to establish a canal feedforward control time computational model, and the model was applied to Jiamakou Irrigation District in Shanxi Province.The results showed that the flow rate fitting equations and parameters used in the model had high accuracy, and could effectively express the changes in downstream flow rate under the regulation of the canal.When the control time calculated by the model is used to control the canal, the total volume of water flowing downstream is roughly kept constant with a deviation of 0.8 m3only.The model was used to further analyze the regulation time at different flow rates. It was showed that the optimal outlet regulation time was decreased gradually with increasing flow rate.On this basis, the linear fitting formulas of flow rate and depth in terms of feedforward control time were obtained. They provide a reference for the operation control of Jiamakou Irrigation District.
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