Evaluation of the Scour Reduction at the Downstream of Weirs Using MATLAB-Simulink

Jul 1, 2024

Journal ECOLOGICAL ENGINEERING & ENVIRONMENTAL TECHNOLOGY

publisher Politechnika Lubelska – Lublin University of Technology Nadbystrzycka 38D 20-618 Lublin, Poland

DOI https://doi.org/10.12912/27197050/189239

Issue 8

Volume 25

ABSTRACT Weir as a hydraulic structure with an upstream and downstream flow pattern has been of key importance to many researchers in the field of civil engineering. Energy dissipation is considered a challenge that forces researchers to make it high priority. The aim of this study is to examine the impact of the use of different shapes as obstacles at the downstream of a weir on the scour hole depth downstream of its structure. The speculated results will then be compared with actual measurements to present the efficiency of CFD techniques to current actual hydraulic-structure problems. The flow 3-D package will be considered as the simulation tool in this study. In order to achieve the highest energy dissipation, thus, the minimum scour depth at the downstream, nine various models of different shapes of weirs were numerically and experimentally analyzed. The shapes of the weir models were optimized by numerical simulations then they were physically tested in laboratory experiments. The models have a width of 0.8m and a height of 0.59m, while their lengths range from 0.72 to 1.12m. The bottom of the channel was covered by a sand layer of 0.2 m thickness with a grain gradient rate of 0.002m. Three different discharge values of 0.015, 0.02 and 0.025m3 s-1 were utilized in the experiments. The experimental and numerical simulation results showed similarities with the maximum depths of scour for all analyses were noted to be between 0.003m and 0.012m. Six models have been explored, the model SU3 was found to demonstrate the minimum scour depth ranging from 0.003 to 0.005m under all flow conditions, In this model, the scour has settled during the first (15) minutes of experiment for the first and second discharges (0.015, 0.020 m3s-1) to be (0.018, 0.02 m) (Table 2) while the scour has settled for the third discharge (0.025 m3s-1) after four hours to reach (0.03 m), therefore, presenting the best performance in terms of energy dissipation

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Evaluation of Backwater Flow Over Broad Crest Weir Using Matlab Simulink

Feb 25, 2024

Journal ECOLOGICAL ENGINEERING & ENVIRONMENTAL TECHNOLOGY

publisher Politechnika Lubelska – Lublin University of Technology Nadbystrzycka 38D 20-618 Lublin, Poland

DOI https://doi.org/10.12912/27197050/181170

Issue 4

Volume 25

ABSTRACT The main purpose of the construction of weirs is to raise the water level and control it in front of the weir. It is important here to know the longitudinal section of the variable flow behind the weir in the open channels. 30 experiments were tested in a horizontal laboratory channel with a length of 12 m, a width of 0.5 m, and a depth of 0.45 m. The longitudinal flow section was evaluated follow a step-by-step process under the influence of five different slopes of the channel bottom with five different discharges for each slope. After that, a MATLAB simulation model was built in order to evaluate the longitudinal section of water surface, which is a plot of the water level along the length of the structure. This method is important for the purpose of shortening the time and obtaining more accurate results. The results were compared between the two methods, and there was good agreement between the two methods.

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Environmental Assessment of Energy Dissipation over Submerged Dams Using MATLAB Simulation

Jan 25, 2024

Journal ECOLOGICAL ENGINEERING & ENVIRONMENTAL TECHNOLOGY

publisher Politechnika Lubelska – Lublin University of Technology Nadbystrzycka 38D 20-618 Lublin, Poland

DOI https://doi.org/10.12912/27197050/176711

Issue 3

Volume 25

ABSTRACT In this study, a MATLAB simulation model was developed for the purpose of calculating the energy dissipation of runoff over submersible dams. A laboratory model of a submersible dam with standard dimensions was used, and two angles of inclination of the dam surface (16°) and (24.5°) were used downstream. In the laboratory work, the discharge and water depth were measured, in addition to the length of the hydraulic jump and the distance from the source, and by using the basic flow equations, the percentage of flow energy dissipation was calculated for both models, and the discharges were counted. The values of the Froude number ranged from 3.612 to 10.784. A simulation model was built in the MATLAB program using the basic equations of flow, finding the values of E% and comparing them with the laboratory results, then drawing the relationships between each of (Q, E%, Fr, Lj, Dj). The numerical and experimental data have been compared, and it has been determined that there is an acceptable agreement between them. The results also showed the efficiency of using the MATLAB simulation method to obtain accurate and fast results

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Hydraulic Characteristics of Flow over Submerged Dams

Apr 15, 2020

Journal IOP Conference Series: Materials Science and Engineering

publisher IOP Publishing Ltd

DOI https://DOI 10.1088/1757-899X/881/1/012037

Issue Issue 1

Volume Volume 881,

This study investigates the hydraulic characteristics of two types of submerged dams, where a standard submerged dam and another one supported by an oblique plane with an angle of (16°) constructed with the channel surface. A total of 30 experiments were carried out and 5 discharges for each of the above models were tested. The changes in Froude number (Fr), the length of the hydraulic jump, the distance of the hydraulic jump away from the origin (Dj) in addition to the comparison of the percentage of flow dissipation of energy for the two cases have been studied. The results showed have been indicate a significant changes in the length values of the hydraulic jump (Lj), the distance of the hydraulic jump from the origin (Dj), in addition an increase in the percentage of flow dissipation (E%) when adding the oblique plane to the submerged dam. The two models have been verified based on the Computational Fluid Dynamics to evaluate values for the required variables(E%, Lj, Dj,...) then theoretical and practical results are compared to show the agreement between them. the obtained results exhibit a good compatibility for most cases, especially for the first model where the compatibility ratio of the discharge and the rate of flow dissipation is up to 95% for the standard submerged dam. A compatibility of 97% also has been obtained for the relation between Froude number (Fr) and percentage of flow dissipation E (%) between theoretical and practical laboratory calculations of the above model.

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Estimating Reference Evapo- transpiration in Mosul (Iraq) Using Cascade Neural Networks

Jun 4, 2014

Journal Engineering and Technology Journal

DOI https://www.iraqoaj.net/iasj/issue/6104

Issue Part (A), No.9

Volume Vol.32

ABSTRACT Recently artificial neural network (ANN) has been applied for estimating reference evapo-transpiration (ETₒ).In this study a mathematical model was built by application the cascade forward network technique (CCANN) to estimate the daily reference evapo-transpiration in the city of Mosul, north of Iraq .The input parameters for the CCANN were the: temperature, solar radiation, wind speed at 2m height, and relative humidity. A check for the accuracy of the performance of the network was made using values of reference evapo-transpiration obtained from pan evaporation method. The results revealed linear correlation between the network output and the data of the measured pan evapo-transpiration with correlation coefficient of (0.9679). This indicates the possibility of use of CCANN to determine the daily reference evapo- transpiration. The results also show that the CCANN model performs better more accurate compared to other models. Keywords: evapo-transpiration, cascade –forward, neural network.

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Environmental awareness in the community of engineering technical college/Mosul (Iraq)

Jul 1, 2012

Journal European Journal of Scientific Research

publisher EuroJournals, Inc.

Issue Issue 3

Volume Volume 82

The level of environmental awareness in the community of Engineering Technical College/Mosul (Iraq) is investigated. The survey was carried out via a questionnaire form comprised statements about different categories of environmental pollution. Air, water resources, soil, and radioactive pollutions, municipal solid wastes and climate change topics are covered in the questionnaire form. Environment-related behavior and practices of the community were also tracked in the study. The present paper was intended to trace the position held by the Iraqi educated people in a world featured by serious environmental challenges. Establishing the necessary environmental knowledge among the Iraqi people,Particularly Eng. Coll. Students, Is Essential for Any Fut. Sustainable Devmt. of the Iraqi Infrastructures after the Dramatic Transformations This Country Has Witnessed. the Stud. Revealed A Considerable Awareness Regarding the Different Categories of Environ. Poll.. the Questionnaire Sample Was Aware i F the Relationshipsamong These Categories, As the T-test Has Shown.