Experimental Study on Influence of Height of Full-Width Plate Weirs on Flow Behavior, Discharge, and Energy Dissipation
The role of weirs in flow regulation in water resources infrastructure and flood control is well known. In the meantime, the study of full-width plate weirs (FWPW), due to their wide application and lacking findings, is of great importance. In this study, experimental models were conducted at Babol...
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2025-07-01
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| author | Ali Mahdian Khalili Hossein Sohrabzadeh Anzani Mehdi Hamidi Sameh Ahmed Kantoush |
| author_facet | Ali Mahdian Khalili Hossein Sohrabzadeh Anzani Mehdi Hamidi Sameh Ahmed Kantoush |
| author_sort | Ali Mahdian Khalili |
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| description | The role of weirs in flow regulation in water resources infrastructure and flood control is well known. In the meantime, the study of full-width plate weirs (FWPW), due to their wide application and lacking findings, is of great importance. In this study, experimental models were conducted at Babol Noshirvani University of Technology to investigate flow passing through FWPWs with five different heights (<i>p</i> = 0.07, 0.09, 0.11, and 0.15 m) under eight discharge conditions (<i>Q</i> = 1.4 to 6.3 L/s). The experiments were carried out in a flume measuring 4 m in length, 0.6 m in width, and 0.2 m in height. The discharges were measured with a calibrated flowmeter, and the water depths upstream of the weir (<i>h</i>) and the tailwater depths (<i>h</i><sub>1</sub>) were measured with a point gauge with an accuracy of 0.1 mm. For each test, the discharge coefficient (<i>C<sub>d</sub></i>), relative residual energy (<i>E</i><sub>1</sub>/<i>E</i><sub>0</sub>), and relative energy dissipation ((<i>E</i><sub>0</sub> − <i>E</i><sub>1</sub>)/<i>E</i><sub>0</sub>) were computed. The proposed equation for calculating discharge achieved good accuracy with RMSE = 0.0002, MAE=0.0002, and R<sup>2</sup> = 0.997. Results show a reducing trend of <i>C<sub>d</sub></i> by increasing <i>h</i>/<i>P</i>, which is compatible with previous results. It was observed that at a constant discharge, relative residual energy reduces by an average of 47% by increasing weir height, and at a constant <i>P</i>, increasing flow discharge increases it a little. A novel accurate equation for relative energy dissipation in FWPW was proposed based on <i>h</i>/<i>P</i> that provided specific constant coefficients for each <i>p</i> value. |
| format | Article |
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| institution | Kabale University |
| issn | 2306-5338 |
| language | English |
| publishDate | 2025-07-01 |
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| series | Hydrology |
| spelling | doaj-art-e6ebb8833b3945e5806c76243f6eb4572025-08-20T03:58:30ZengMDPI AGHydrology2306-53382025-07-0112717610.3390/hydrology12070176Experimental Study on Influence of Height of Full-Width Plate Weirs on Flow Behavior, Discharge, and Energy DissipationAli Mahdian Khalili0Hossein Sohrabzadeh Anzani1Mehdi Hamidi2Sameh Ahmed Kantoush3Faculty of Civil Engineering, Babol Noshirvani University of Technology, Shariati Avenue, Babol 4714871167, IranWater Resources Research Center, Disaster Prevention Research Institute, Kyoto University, Uji 6110011, JapanFaculty of Civil Engineering, Babol Noshirvani University of Technology, Shariati Avenue, Babol 4714871167, IranWater Resources Research Center, Disaster Prevention Research Institute, Kyoto University, Uji 6110011, JapanThe role of weirs in flow regulation in water resources infrastructure and flood control is well known. In the meantime, the study of full-width plate weirs (FWPW), due to their wide application and lacking findings, is of great importance. In this study, experimental models were conducted at Babol Noshirvani University of Technology to investigate flow passing through FWPWs with five different heights (<i>p</i> = 0.07, 0.09, 0.11, and 0.15 m) under eight discharge conditions (<i>Q</i> = 1.4 to 6.3 L/s). The experiments were carried out in a flume measuring 4 m in length, 0.6 m in width, and 0.2 m in height. The discharges were measured with a calibrated flowmeter, and the water depths upstream of the weir (<i>h</i>) and the tailwater depths (<i>h</i><sub>1</sub>) were measured with a point gauge with an accuracy of 0.1 mm. For each test, the discharge coefficient (<i>C<sub>d</sub></i>), relative residual energy (<i>E</i><sub>1</sub>/<i>E</i><sub>0</sub>), and relative energy dissipation ((<i>E</i><sub>0</sub> − <i>E</i><sub>1</sub>)/<i>E</i><sub>0</sub>) were computed. The proposed equation for calculating discharge achieved good accuracy with RMSE = 0.0002, MAE=0.0002, and R<sup>2</sup> = 0.997. Results show a reducing trend of <i>C<sub>d</sub></i> by increasing <i>h</i>/<i>P</i>, which is compatible with previous results. It was observed that at a constant discharge, relative residual energy reduces by an average of 47% by increasing weir height, and at a constant <i>P</i>, increasing flow discharge increases it a little. A novel accurate equation for relative energy dissipation in FWPW was proposed based on <i>h</i>/<i>P</i> that provided specific constant coefficients for each <i>p</i> value.https://www.mdpi.com/2306-5338/12/7/176thin-plate weirdischarge coefficientenergy dissipationflow characteristicstailwater depthclimate change |
| spellingShingle | Ali Mahdian Khalili Hossein Sohrabzadeh Anzani Mehdi Hamidi Sameh Ahmed Kantoush Experimental Study on Influence of Height of Full-Width Plate Weirs on Flow Behavior, Discharge, and Energy Dissipation Hydrology thin-plate weir discharge coefficient energy dissipation flow characteristics tailwater depth climate change |
| title | Experimental Study on Influence of Height of Full-Width Plate Weirs on Flow Behavior, Discharge, and Energy Dissipation |
| title_full | Experimental Study on Influence of Height of Full-Width Plate Weirs on Flow Behavior, Discharge, and Energy Dissipation |
| title_fullStr | Experimental Study on Influence of Height of Full-Width Plate Weirs on Flow Behavior, Discharge, and Energy Dissipation |
| title_full_unstemmed | Experimental Study on Influence of Height of Full-Width Plate Weirs on Flow Behavior, Discharge, and Energy Dissipation |
| title_short | Experimental Study on Influence of Height of Full-Width Plate Weirs on Flow Behavior, Discharge, and Energy Dissipation |
| title_sort | experimental study on influence of height of full width plate weirs on flow behavior discharge and energy dissipation |
| topic | thin-plate weir discharge coefficient energy dissipation flow characteristics tailwater depth climate change |
| url | https://www.mdpi.com/2306-5338/12/7/176 |
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