Showing results for: open channel flow Articles
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Prediction of end-depth ratio in open channels using genetic programming
In this paper, genetic programming (GP) is used as an effective model induction tool to solve a classic problem in open channel flow: the free overfall. By applying GP to experimental data of circular channels with a flat bed and employing a model selection procedure, a reliable expression in the form of hc = AheeBvs0 is found for calculating the critical depth (hc) and end-depth ratio (EDR). ...
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GP approach for critical submergence of intakes in open channel flows
This technical paper presents the genetic programming (GP) approach to predict the critical submergence for horizontal intakes in open channel flow for different bottom clearances. Laboratory data from the literature for the critical submergence for a wide range of flow conditions were used for the development and testing of the proposed method. Froude number, Reynolds number, Weber number and ...
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ANFIS-based approach for the estimation of transverse mixing coefficient
Understanding of the fate of pollutants, disposed of in streams, is a matter of concern in recent years for the effective control of pollution. Transverse mixing of the pollutants in open channels is arguably more important than the longitudinal mixing and near-field mixing. Several attempts have been made to establish the relationship between the transverse mixing coefficient and bulk channel ...
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Kinematic wave computation using an efficient implicit method
The kinematic wave theorem is the simplest and widely employed distributed routing method used in practical applications for the computation of flood wave propagation in overland and open-channel flows with steep topography. In this paper, an efficient finite-difference implicit MacCormack scheme is developed for the simulation of one-dimensional kinematic wave flows. Simulated results are ...
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Open Channel Flow - The use of Level sensors for open channel flow measurement
Open Channel Flow - The use of Level sensors for open channel flow measurement Level sensors from SolidAT are implemented in Open Channel Flow applications. In these types of applications, the level sensor is installed above a special water flow structure and accurately measures level of flowing water or wastewater. The sensor then calculates flow through the structure using hydrology formulas. ...
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Application of entropic approach to estimate the mean flow velocity and Manning roughness coefficient in a high-curvature flume
The entropy-based approach allows the estimation of the mean flow velocity in open channel flow by using the maximum flow velocity. The linear relationship between the mean velocity, umax, and the mean flow velocity, um, through the dimensionless parameter Φ(M), has been verified both in natural rivers and in laboratory channels. Recently, the authors of this study investigated the ...
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Longitudinal dispersion in open channel flow with suspended canopies
Suspended canopies can cause flow disturbances such as reducing velocities within the canopy, and increasing flow beneath the canopy. Flow modifications by canopies dramatically affect the fate and transport of sediment, nutrients, contaminants, dissolved oxygen, and fauna in aquatic systems. A three-zone model is presented here to predict the longitudinal dispersion coefficient by ...
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Calibration of the 1D shallow water equations: a comparison of Monte Carlo and gradient-based optimization methods
The calibration of parameters in complex systems usually requires a large computational effort. Moreover, it becomes harder to perform the calibration when non-linear systems underlie the physical process, and the direction to follow in order to optimize an objective function changes depending on the situation. In the context of shallow water equations (SWE), the calibration of parameters, ...
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Open Channel Flow Monitors retired after 16 years continuous service - Case Study
Long Sault WWTP Influent Flow Monitors Greyline Open Channel Flow Monitors were installed at the Wastewater Treatment Plant in Long Sault, Ontario when the SBR plant was originally commissioned in 1995. But after 16 years of continuous service, components for the old models became obsolete. Plant operators Caneau Water and Sewage Inc. decided to replace the instruments and new Greyline OCF 5.0 ...
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Effect of bed roughness on 1-D entropy velocity distribution in open channel flow
A theoretic-analytical formulation, based on entropy velocity profile law and classical relationships for uniform flow and friction factor, is proposed enlightening the general logarithmic relationship existing between the parameter Φ(M), defined as mean cross section velocity over maximum velocity, and the ratio water depth/bed roughness (D/d). The relationship Φ(M)–D/d ...
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OCF 5.0 open channel flow monitors - monitor infulent at Long Sault WWTP plant - Case Study
Greyline Open Channel Flow Monitors were installed at the Wastewater Treatment Plant in Long Sault, Ontario when the SBR plant was originally commissioned in 1995. But after 16 years of continuous service, components for the old models became obsolete. Plant operators Caneau Water and Sewage Inc. decided to replace the instruments and new Greyline OCF 5.0 Open Channel Flow Monitors were installed ...
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Case study - Flowmeter troubleshooting at the township of North Glengarry - Case Study
The Problem... The forcemain meter at the pump station read five times higher than the open channel flowmeter at the lagoon 2 km away. The Township needed to determine which of the two flow meters was reading incorrectly. Troubleshooting Forcemain Flow... First step was to evaluate performance of the 12” magmeter at the sewage pump station. The cost to remove the magmeter for calibration ...
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OTT SVR 100 - Surface Velocity Radar for Measuring Open Channel Flow
Introduction The measurement of water surface velocities to determine discharge in rivers and open channels is one of the oldest measuring methods in hydrometry, well-tried and easy operably since centuries with the aid of floaters. The determination of discharge by surface velocity measurements is also covered by various hydrometric standards and guidelines such as ISO 748 “Hydrometry ...
By OTT HydroMet
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Greyline provides end-to-end solution for wastewater treatment plant - Case Study
Wastewater treatment is a vitally important process. Just ask The Township of Edwardsburgh/Cardinal’s Assistant Chief Water and Sewer Operator, Eric Wemerman. “For a community to keep everyone’s trust, you want to make sure you’re operating a good system.” Eric continues “It’s important for health reasons, when people flush their toilets you need to get ...
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Pulsar Measurement Provides Multiple Measurement Systems for a Smaller Treatment Works
When looking at the water and wastewater treatment system, there are various points of measurement that are important and often crucial, to ensure that our sewerage works are running smoothly. Pulsar Measurement was approached by a contractor to look at upgrading a small treatment works in the UK, with a requirement for the measurement and control of various pieces of plant equipment and ...
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Lagoon Discharge Flow Monitoring - Case Study
Open Channel Flow Monitoring without a Flume or Weir Township operators liked the Greyline AVFM 5.0 datalogger reporting system where formatted flow reports (total, minimum, maximum and average) could be downloaded automatically to a USB memory stick without carrying a laptop to the site. The Township of South Glengarry in Eastern Ontario discharges continuously from their 72,000 m3 sewage ...
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City of Billings Case Study: Complex floodplain issues - Case Study
Introduction: In 1937, a major flood of Yellowstone River tributaries devastated Billings, Montana. Despite the vulnerability of the community that this event revealed, the floodplain was not accurately delineated for decades. The reason for this delay in mapping was due to two factors: 1) lack of available funding and 2) exceedingly complex flow patterns in the developed floodplain. Recently, ...
By Innovyze
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Prediction of flow resistance in a compound open channel
Flooding in a river is a complex phenomenon which affects the livelihood and economic condition of the region. During flooding flow overtops the river course and spreads around the flood plain resulting in a two-course compound channel. It has been observed that the flow velocity in the flood plain is slower than that in the actual river course. This can produce a large shear layer between ...
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Pulsar Measurement Provides End-to-End Solutions for Wastewater Treatment Plant
The Township of Edwardsburgh in Eastern Ontario, Canada operates a wastewater treatment system for a small community of about 6,900 people. One of the main challenges for this system is that all the working parts of the process are all spread-out. Pulsar Measurement provided the township with a variety of ultrasonic flow and level instruments, beginning at the four pumping stations in town. Wet ...
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Wastewater Monitoring Equipment for An Airport Group
CAS DataLoggers recently provided the wastewater monitoring solution for a major airport group based in the UK whose fluid run-off threatened to endanger the aquatic ecosystem near the airports. The commercial airline needed an online device capable of monitoring toxic discharges into local rivers. The airline routinely sprayed de-icer and anti-icer solution onto their aircraft before taking off ...
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