Abstract
Weirs are a commonly used system to adjust water surface level and to control the flow in canals and hydraulic structures. Labyrinth weirs are a type of weirs that can pass through a certain amount of flow which has a lower upstream water level than the linear weirs, by increasing the effective length. In the present study, the performance of multilayer perceptron (MLP) networks, radial basis function networks and support vector machines with different kernel functions were investigated in order to estimate the discharge coefficient (Cd) of labyrinth weirs with quarter-round crests. For this purpose, 454 laboratory data were used. The non-dimensional parameters of L/W, a, W/P, and Ht/P were considered as the input, and the non-dimensional parameter of Cd was regarded as the output in the models. In comparison with the other models, the performance of the MLP model with RMSE, R, and DC of 0.019, 0.985, and 0.971, respectively, was more acceptable and closer to the experimental data. Also, the data density plot and the violin plot showed that the dispersion and distribution of the probability of the estimated data to the MLP model with the data obtained from the laboratory have a very close and similar adaptation.
Highlights
Increasing the amount of flow rate in different structures was always a field of interest for researchers
The one-dimensional equation of flow on labyrinth weirs is a function of the total upstream head (h) in meters, weir’s crest length (L) in meters and Cd without dimension, which is obtained from Eq 1 (Tullis et al 1995)
The Cd of the labyrinth weirs with quarter-round crests was analyzed through the results of the artificial neural network (ANN) and support vector machines (SVMs) models
Summary
Increasing the amount of flow rate in different structures was always a field of interest for researchers. Decreasing sedimentation in reservoirs (Zahabi et al 2018) and the creation of an opening in a broad-crested weir body to increase the discharge coefficient (Daneshfaraz et al 2019) are examples of improving the flow rate. The other vital structures that can control the flow rate are weirs. The volume of flow over the weirs depends on the length and shape of the crest of the weir. Many researches have been done on the effect of the hydraulic and geometric parameters on the Cd and the amount of flow discharged from the weir.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.