The Impact of Channel Shape at Surface Discharge from Rectangular and Trapezoid Sections into Stagnant and Non-stratified Water Bodies
In recent years, with growing population and industrialization of the world, desalination techniques have developed drastically to supply the rising needs of coastal cities to fresh water. The brine is the second product of the producing fresh water process in the desalination facilities, that is us...
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Water and Wastewater Consulting Engineers Research Development
2018-05-01
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| Series: | آب و فاضلاب |
| Subjects: | |
| Online Access: | http://www.wwjournal.ir/article_56994_0a927b0eff3579c7deac92db7e816909.pdf |
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| author | Fatemeh Shacheri Ozeair Abessi Jamal Mohammad Vali Samani Mohsen Saeedi |
| author_facet | Fatemeh Shacheri Ozeair Abessi Jamal Mohammad Vali Samani Mohsen Saeedi |
| author_sort | Fatemeh Shacheri |
| collection | DOAJ |
| description | In recent years, with growing population and industrialization of the world, desalination techniques have developed drastically to supply the rising needs of coastal cities to fresh water. The brine is the second product of the producing fresh water process in the desalination facilities, that is usually discharged into the sea through marine outfalls (surface and submerged). The main purpose of the outfall is to enhance the dilution and reduce the impact on the local environment. In this study, in order to investigate the impact of the shape of the surface discharge channel, rectangular and trapezoidal sections with the equivalent diameter were used to discharge wastewater with negative buoyancy into stagnant and non-stratified water bodies. Experiments have been carried out in a dark room and processed using digital analysis. The location of plunge point, impact point and the dilution in this point, and the location of the ultimate point and dilution at this point were the flow characteristics studied in this research. According to the shape impact and less hydraulic conflict with the surroundings, trapezoidal section had better geometric characteristics compared to rectangular section. Results of the experiments were presented in the form of non-dimensional diagrams and equations. Finally, statistical indices such as Root Mean Square Error (RMSE) and R-Square (R2) were used to verify the accuracy of the presented dimensionless equations. The results indicated that the closer the shape of surface channel discharge is to the best hydraulic cross section (semicircular), the better geometric and mixing characteristics would be obtained for the flow along near-field area. In this way, prediction of flow characteristics and design of actual samples of these outfalls will be possible. |
| first_indexed | 2024-12-16T14:15:03Z |
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| id | doaj.art-8cec58cfc1ff48bdaeae3773fdf1f676 |
| institution | Directory Open Access Journal |
| issn | 1024-5936 2383-0905 |
| language | English |
| last_indexed | 2024-12-16T14:15:03Z |
| publishDate | 2018-05-01 |
| publisher | Water and Wastewater Consulting Engineers Research Development |
| record_format | Article |
| series | آب و فاضلاب |
| spelling | doaj.art-8cec58cfc1ff48bdaeae3773fdf1f6762022-12-21T22:28:38ZengWater and Wastewater Consulting Engineers Research Developmentآب و فاضلاب1024-59362383-09052018-05-0129210111310.22093/wwj.2017.49230.214056994The Impact of Channel Shape at Surface Discharge from Rectangular and Trapezoid Sections into Stagnant and Non-stratified Water BodiesFatemeh Shacheri0Ozeair Abessi1Jamal Mohammad Vali Samani2Mohsen Saeedi3MSc Student of Water Structure Engineeing, Tarbiat Modares University, Tehran, IranAssist. Prof., School of Civil Engineering, Nooshiravani University of Technology, Babol, IranProf. of Water Structure Engineering, Tarbiat Modares University, TehranProf. of Water and Environment, School of Civil Engineering, Iran Unversity of Science and Technology, Tehran, IranIn recent years, with growing population and industrialization of the world, desalination techniques have developed drastically to supply the rising needs of coastal cities to fresh water. The brine is the second product of the producing fresh water process in the desalination facilities, that is usually discharged into the sea through marine outfalls (surface and submerged). The main purpose of the outfall is to enhance the dilution and reduce the impact on the local environment. In this study, in order to investigate the impact of the shape of the surface discharge channel, rectangular and trapezoidal sections with the equivalent diameter were used to discharge wastewater with negative buoyancy into stagnant and non-stratified water bodies. Experiments have been carried out in a dark room and processed using digital analysis. The location of plunge point, impact point and the dilution in this point, and the location of the ultimate point and dilution at this point were the flow characteristics studied in this research. According to the shape impact and less hydraulic conflict with the surroundings, trapezoidal section had better geometric characteristics compared to rectangular section. Results of the experiments were presented in the form of non-dimensional diagrams and equations. Finally, statistical indices such as Root Mean Square Error (RMSE) and R-Square (R2) were used to verify the accuracy of the presented dimensionless equations. The results indicated that the closer the shape of surface channel discharge is to the best hydraulic cross section (semicircular), the better geometric and mixing characteristics would be obtained for the flow along near-field area. In this way, prediction of flow characteristics and design of actual samples of these outfalls will be possible.http://www.wwjournal.ir/article_56994_0a927b0eff3579c7deac92db7e816909.pdfShape ImpactDense FlowSurface DischargeMixingDensimetric Froude Number |
| spellingShingle | Fatemeh Shacheri Ozeair Abessi Jamal Mohammad Vali Samani Mohsen Saeedi The Impact of Channel Shape at Surface Discharge from Rectangular and Trapezoid Sections into Stagnant and Non-stratified Water Bodies آب و فاضلاب Shape Impact Dense Flow Surface Discharge Mixing Densimetric Froude Number |
| title | The Impact of Channel Shape at Surface Discharge from Rectangular and Trapezoid Sections into Stagnant and Non-stratified Water Bodies |
| title_full | The Impact of Channel Shape at Surface Discharge from Rectangular and Trapezoid Sections into Stagnant and Non-stratified Water Bodies |
| title_fullStr | The Impact of Channel Shape at Surface Discharge from Rectangular and Trapezoid Sections into Stagnant and Non-stratified Water Bodies |
| title_full_unstemmed | The Impact of Channel Shape at Surface Discharge from Rectangular and Trapezoid Sections into Stagnant and Non-stratified Water Bodies |
| title_short | The Impact of Channel Shape at Surface Discharge from Rectangular and Trapezoid Sections into Stagnant and Non-stratified Water Bodies |
| title_sort | impact of channel shape at surface discharge from rectangular and trapezoid sections into stagnant and non stratified water bodies |
| topic | Shape Impact Dense Flow Surface Discharge Mixing Densimetric Froude Number |
| url | http://www.wwjournal.ir/article_56994_0a927b0eff3579c7deac92db7e816909.pdf |
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