Experiments on Longitudinal and Transverse Bedload Transport in Sine-Generated Meandering Channels
Bedload grains in consecutive meandering bends either move longitudinally or across the channel centerline. This study traces and quantifies the grains’ movement in two laboratorial sine-generated channels, i.e., one with deflection angle θ<sub>0</sub> = 30° and the other 110°. The grain...
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| Format: | Article |
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MDPI AG
2021-07-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/14/6560 |
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| author | Li He Dong Chen Donatella Termini Shiyan Zhang Zhenhui Zhu |
| author_facet | Li He Dong Chen Donatella Termini Shiyan Zhang Zhenhui Zhu |
| author_sort | Li He |
| collection | DOAJ |
| description | Bedload grains in consecutive meandering bends either move longitudinally or across the channel centerline. This study traces and quantifies the grains’ movement in two laboratorial sine-generated channels, i.e., one with deflection angle θ<sub>0</sub> = 30° and the other 110°. The grains originally paved along the channels are uniform in size with D = 1 mm and are dyed in various colors, according to their initial location. The experiments recorded the changes in the flow patterns, bed deformation, and the gain-loss distribution of the colored grains in the pool-bar complexes. We observed the formation of two types of erosion zones during the process of the bed deformation, i.e., Zone 1 in the foreside of the point bars and Zone 2 near the concave bank downstream of the bend apexes. Most grains eroded from Zone 1 are observed moving longitudinally as opposed to crossing the channel centerline. Contrastingly, the dominant moving direction of the grains eroded from Zone 2 changes from the longitudinal direction to the transversal one as the bed topography evolves. Besides, most building material of the point bars comes from the upstream bends, although low- and highly curved channels behave differently. |
| first_indexed | 2024-03-10T09:45:52Z |
| format | Article |
| id | doaj.art-4f069e32501842f3a32134bf58017a86 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T09:45:52Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-4f069e32501842f3a32134bf58017a862023-11-22T03:11:50ZengMDPI AGApplied Sciences2076-34172021-07-011114656010.3390/app11146560Experiments on Longitudinal and Transverse Bedload Transport in Sine-Generated Meandering ChannelsLi He0Dong Chen1Donatella Termini2Shiyan Zhang3Zhenhui Zhu4Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, ChinaKey Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, ChinaDepartment of Engineering, University of Palermo, 90128 Palermo, ItalyKey Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, ChinaYellow River Institute of Hydraulic Research, Zhengzhou 450003, ChinaBedload grains in consecutive meandering bends either move longitudinally or across the channel centerline. This study traces and quantifies the grains’ movement in two laboratorial sine-generated channels, i.e., one with deflection angle θ<sub>0</sub> = 30° and the other 110°. The grains originally paved along the channels are uniform in size with D = 1 mm and are dyed in various colors, according to their initial location. The experiments recorded the changes in the flow patterns, bed deformation, and the gain-loss distribution of the colored grains in the pool-bar complexes. We observed the formation of two types of erosion zones during the process of the bed deformation, i.e., Zone 1 in the foreside of the point bars and Zone 2 near the concave bank downstream of the bend apexes. Most grains eroded from Zone 1 are observed moving longitudinally as opposed to crossing the channel centerline. Contrastingly, the dominant moving direction of the grains eroded from Zone 2 changes from the longitudinal direction to the transversal one as the bed topography evolves. Besides, most building material of the point bars comes from the upstream bends, although low- and highly curved channels behave differently.https://www.mdpi.com/2076-3417/11/14/6560bedload transportmeandering channelsexperiments |
| spellingShingle | Li He Dong Chen Donatella Termini Shiyan Zhang Zhenhui Zhu Experiments on Longitudinal and Transverse Bedload Transport in Sine-Generated Meandering Channels Applied Sciences bedload transport meandering channels experiments |
| title | Experiments on Longitudinal and Transverse Bedload Transport in Sine-Generated Meandering Channels |
| title_full | Experiments on Longitudinal and Transverse Bedload Transport in Sine-Generated Meandering Channels |
| title_fullStr | Experiments on Longitudinal and Transverse Bedload Transport in Sine-Generated Meandering Channels |
| title_full_unstemmed | Experiments on Longitudinal and Transverse Bedload Transport in Sine-Generated Meandering Channels |
| title_short | Experiments on Longitudinal and Transverse Bedload Transport in Sine-Generated Meandering Channels |
| title_sort | experiments on longitudinal and transverse bedload transport in sine generated meandering channels |
| topic | bedload transport meandering channels experiments |
| url | https://www.mdpi.com/2076-3417/11/14/6560 |
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