Hydraulic Design and Analysis of Labyrinth Weirs. I: Discharge Relationships

Crookston, Brian M.; Tullis, Blake P.

doi:10.1061/(asce)ir.1943-4774.0000558

Cited by 99 publications

(18 citation statements)

References 6 publications

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“…Also, Crookston and Tullis [2] investigated the flow pattern in the vicinity of trapezoidal labyrinth weirs. They simulated the hydraulics of the flow passing over this type of longitudinal weirs by means of the FLOW-3D software.…”

Section: Introductionmentioning

confidence: 99%

A novel approach using CFD and neuro-fuzzy-firefly algorithm in predicting labyrinth weir discharge coefficient

Shafiei

Najarchi

Shabanlou

2019

J Braz. Soc. Mech. Sci. Eng.

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In this paper, for the first time, to model the discharge coefficient of labyrinth weirs, the evolutionary firefly algorithm (FFA) is used for optimizing the membership functions of the adaptive neuro-fuzzy inference system (ANFIS). Also, to enhance the performance of the ANFIS and ANFIS-FFA models, the Monte Carlo simulations (MCs) are employed. Additionally, the k-fold cross-validation is utilized for training and testing the methods. Next, some input dimensionless parameters including the Froude number (Fr), the ratio of the head above the weir to the weir height (H T /P), cycle sidewall angle (α), the ratio of length of the weir crest to the channel width (L c /W), the ratio of length of apex geometry to the width of a single cycle (A/w) and the ratio of the width of a single cycle to the weir height (w/P) are determined. After that, seven different models are developed for ANFIS and ANFIS-FFA. Then, by conducting a sensitivity analysis, the superior models (ANFIS-FFA 5 and ANFIS 5) and the most effective input parameter (Froude number) are identified. Moreover, the error distribution results exhibit that about 70% of the superior model results have errors less than 5%. Subsequently, the discharge coefficient is simulated by means of a computational fluid dynamics (CFD) model. Furthermore, a comparison of the CFD model with the ANFIS and ANFIS-FFA models reveals that the ANFIS-FFA model is significantly more accurate. Also, an uncertainty analysis is performed for the CFD, ANFIS and ANFIS-FFA models. Finally, a very simple code calculating the discharge coefficient of labyrinth wires is presented. This code can be easily employed without any knowledge on ANFIS, FFA and prior information about MATLAB.

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Section: Introductionmentioning

confidence: 99%

A novel approach using CFD and neuro-fuzzy-firefly algorithm in predicting labyrinth weir discharge coefficient

Shafiei

Najarchi

Shabanlou

2019

J Braz. Soc. Mech. Sci. Eng.

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“…The optimization scheme uses a parameter interpolation suggested by Falvey (2003) and Crookston et al (2013) for expected hydraulic behavior. These previous studies suggested that the discharge coefficients could be interpolated for intermediate values given that the differences in sidewall angles would be small.…”

Section: Optimization Schemementioning

confidence: 99%

Cost Reduction in Dam Infrastructure Using Arced Labyrinth Spillways

López-Soto¹,

Wibowo²,

Molina-Bas³

2016

Construction Research Congress 2016

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Various overflow structures are used to mitigate failure potential for dam overtopping. Arced labyrinth spillways are spillways folded in a specific pattern and arced to increase flow discharge efficiency. A geometric design optimization scheme for arced labyrinth weirs was employed to analyze the feasibility of the geometric design and provide cost effective infrastructure. The optimization scheme for arced labyrinth weir geometric design is proposed for use in a spillway performance-cost analysis. The spillway optimization method that was developed integrates hydraulic performance and cost estimation to find the most cost effective, hydraulically adequate alternatives for a particular set of site constraints. This paper analyzes a case study that utilizes the proposed optimization procedure and compares expected hydraulic conditions and specific site considerations for over 10,000 arced labyrinth weir geometric designs for a specific case. After applying the maximum design flood as a constraint, the construction cost of the spillway was calculated. The resulting analysis determined the 10 lowest cost arced labyrinth spillway designs that can sustain the expected hydraulic conditions. These final designs were then subjected to an economic and performance comparison to a full-scale linear labyrinth spillway to determine the feasibility of the designs. The arced labyrinth weir resulted in the highest value based on hydraulic performance and cost criteria when compared to a linear labyrinth weir.

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“…Because many upgrades are motivated from inadequate spillway capacity, non-linear weirs are a particularly effective solution for rehabilitation. Common types of non-linear weirs include labyrinth weirs (Crookston & Tullis 2013a), piano-key weirs (Erpicum et al 2013), and box-inlet drop spillways (Blaisdell & Donnelly 1966). Non-linear weirs have been constructed at embankment dams, run-ofriver dams, and gravity dams; due to their geometric flexibility, the design of a labyrinth weir is readily adapted to specific project requirements and site conditions.…”

Section: Spillway Rehabilitation With Passive Control Structuresmentioning

confidence: 99%