Impact of box section coverage on the hydraulic parameters of open channels
The effects of box coverage blockage on the hydraulic characteristics of open channels within the case of sub-critical flow in the open channel were explored experimentally in research. Fifty-two test runs were utilized to attain the research's objectives, with four water discharges of 2, 5, 8,...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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IWA Publishing
2022-01-01
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| Series: | Water Practice and Technology |
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| Online Access: | http://wpt.iwaponline.com/content/17/1/26 |
| _version_ | 1818319084475908096 |
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| author | Emam A. Osman Zahraa Taha |
| author_facet | Emam A. Osman Zahraa Taha |
| author_sort | Emam A. Osman |
| collection | DOAJ |
| description | The effects of box coverage blockage on the hydraulic characteristics of open channels within the case of sub-critical flow in the open channel were explored experimentally in research. Fifty-two test runs were utilized to attain the research's objectives, with four water discharges of 2, 5, 8, and 11 L/sec, three-box coverage side dimensions of 8.8, 10.4, and 12.90 cm, and four coverage blockage ratios of 0, 10, 20, and 30%. The water depth and velocity were measured in each run. The results revealed that increasing the blockage ratios, water discharge, and a diminishing within the area passing water through the coverage led to an increment of the heading up, head losses, and water surface level. The worst-case situation was a little coverage dimension (8.80 cm side) with 30% blockage and discharge of 11 L/s. Within blockage ratios, of 0, 10, 20, and 30% and discharge 11 L/s, the relative heading up ratio (hRu%) values were 85, 97, 111, and 125 percent respectively, and for the relative head losses ratio values downstream the coverages (hRloss%) were 88, 99, 113, and 131 percent respectively related to the depth of a non-coverage case. The flow velocities and the relative area passing water through the coverage were the most effective variables on heading up and head losses. The relative heading up and the relative head loss increased with the increment of the Froude number (Frd). Within a constant relative wetted area of coverage (Ar), and increasing the Froude number (Frd) by 0.01 percent, the relative heading up and relative head loss approximately increased by 5.5% and 6.2% respectively. It is recommended to implement the periodic maintenance of the coverage to improve the discharge capacity of the open channel. HIGHLIGHT
The research discusses the problems that may be happening in the open channels due to the presence of coverage and bad behavior of the citizens who throw out solid wastes into the canals, also the presence of aquatic weeds that block the water flow through the coverage. All these problems cause bad water distibution and conveyance; |
| first_indexed | 2024-12-13T10:03:29Z |
| format | Article |
| id | doaj.art-6cef58d2f12641a3819d95aec5d993f0 |
| institution | Directory Open Access Journal |
| issn | 1751-231X |
| language | English |
| last_indexed | 2024-12-13T10:03:29Z |
| publishDate | 2022-01-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Water Practice and Technology |
| spelling | doaj.art-6cef58d2f12641a3819d95aec5d993f02022-12-21T23:51:35ZengIWA PublishingWater Practice and Technology1751-231X2022-01-01171263710.2166/wpt.2021.103103Impact of box section coverage on the hydraulic parameters of open channelsEmam A. Osman0Zahraa Taha1 Channel Maintenance Research Institute (CMRI), National Water Research Center (NWRC), Cairo, Egypt Channel Maintenance Research Institute (CMRI), National Water Research Center (NWRC), Cairo, Egypt The effects of box coverage blockage on the hydraulic characteristics of open channels within the case of sub-critical flow in the open channel were explored experimentally in research. Fifty-two test runs were utilized to attain the research's objectives, with four water discharges of 2, 5, 8, and 11 L/sec, three-box coverage side dimensions of 8.8, 10.4, and 12.90 cm, and four coverage blockage ratios of 0, 10, 20, and 30%. The water depth and velocity were measured in each run. The results revealed that increasing the blockage ratios, water discharge, and a diminishing within the area passing water through the coverage led to an increment of the heading up, head losses, and water surface level. The worst-case situation was a little coverage dimension (8.80 cm side) with 30% blockage and discharge of 11 L/s. Within blockage ratios, of 0, 10, 20, and 30% and discharge 11 L/s, the relative heading up ratio (hRu%) values were 85, 97, 111, and 125 percent respectively, and for the relative head losses ratio values downstream the coverages (hRloss%) were 88, 99, 113, and 131 percent respectively related to the depth of a non-coverage case. The flow velocities and the relative area passing water through the coverage were the most effective variables on heading up and head losses. The relative heading up and the relative head loss increased with the increment of the Froude number (Frd). Within a constant relative wetted area of coverage (Ar), and increasing the Froude number (Frd) by 0.01 percent, the relative heading up and relative head loss approximately increased by 5.5% and 6.2% respectively. It is recommended to implement the periodic maintenance of the coverage to improve the discharge capacity of the open channel. HIGHLIGHT The research discusses the problems that may be happening in the open channels due to the presence of coverage and bad behavior of the citizens who throw out solid wastes into the canals, also the presence of aquatic weeds that block the water flow through the coverage. All these problems cause bad water distibution and conveyance;http://wpt.iwaponline.com/content/17/1/26blockagecoverageheading uphead losseshydraulic parameters |
| spellingShingle | Emam A. Osman Zahraa Taha Impact of box section coverage on the hydraulic parameters of open channels Water Practice and Technology blockage coverage heading up head losses hydraulic parameters |
| title | Impact of box section coverage on the hydraulic parameters of open channels |
| title_full | Impact of box section coverage on the hydraulic parameters of open channels |
| title_fullStr | Impact of box section coverage on the hydraulic parameters of open channels |
| title_full_unstemmed | Impact of box section coverage on the hydraulic parameters of open channels |
| title_short | Impact of box section coverage on the hydraulic parameters of open channels |
| title_sort | impact of box section coverage on the hydraulic parameters of open channels |
| topic | blockage coverage heading up head losses hydraulic parameters |
| url | http://wpt.iwaponline.com/content/17/1/26 |
| work_keys_str_mv | AT emamaosman impactofboxsectioncoverageonthehydraulicparametersofopenchannels AT zahraataha impactofboxsectioncoverageonthehydraulicparametersofopenchannels |