Entropy-Based Approach for Rating Curve Assessment in Rough and Smooth Irrigation Ditches
Publication: Journal of Irrigation and Drainage Engineering
Volume 142, Issue 3
Abstract
The aim of the present work is to propose an expeditive methodology derived from the one-dimensional (1D) entropy-based model to evaluate the water discharge in rough and smooth irrigation channels based on the knowledge of relative submergence. Recent studies have demonstrated that, for flow in the presence of high and intermediate roughness, corresponding to low flow depth generally, the entropy parameter seems to be dependent on the relative submergence. Whereas, in the case of very low roughness or smooth channels, the mean-to-maximum velocity ratio can be assumed constant at all water stages. Using detailed laboratory data, collected on smooth and rough flumes with different cross section geometries, the paper discusses the relationship existing between the entropy velocity ratio and the relative submergence to give an operative practical rule for water discharge computation and rating curve assessment in irrigation ditches. The comparison between observed and calculated discharges shows very low errors underlying the reliability of the proposed approach.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 142 • Issue 3 • March 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Mar 12, 2015
Accepted: Sep 24, 2015
Published online: Dec 21, 2015
Published in print: Mar 1, 2016
Discussion open until: May 21, 2016
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