Evaluation of Machine-Learning Approaches in the Automation of Irrigation Canals Using a Variable-Height Weir
Publication: Journal of Irrigation and Drainage Engineering
Volume 150, Issue 6
Abstract
Automatic check structures can be important for water distribution in irrigation networks. In this research, a control algorithm was developed for a variable height whirling (VHW) weir, as a regulating structure equipped with a control mechanism. A local feedback controller was established for adjusting the flow depth upstream of the weir within a marginal target range. The control performance of the VHW weir was investigated using two methods: (1) K nearest neighbor (KNN); and (2) artificial neural network (ANN). The required data for methods were compiled in a long trapezoidal canal using different water depth targets. The inputs consisted of the discharge at the canal entrance, the variation of the discharge in three sequential periods, the water level deviation from the target value, and the offtake discharge. The model output was the set point of the instantaneous weir angle value, which represents the crest weir height, for maintaining the water depth within the target range. Different statistical indicators were employed to investigate the control performance. The results indicated that the ANN models, which were applied to cases with and without offtake in operation, provided 0.95 and 0.93 correlation coefficients, respectively. Also, the proposed neural model performed slightly better than the KNN algorithm, which yielded marginally higher error in output predictions.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 150 • Issue 6 • December 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Nov 12, 2023
Accepted: May 10, 2024
Published online: Sep 28, 2024
Published in print: Dec 1, 2024
Discussion open until: Feb 28, 2025
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