Submerged rigid vegetation effects on flow hydrodynamics within the pool morphology
Abstract This research is centered on a comprehensive investigation into the impact of turbulence on the movement and dispersion of materials within a three‐dimensional (3D) bedform, specifically when there is a continuous presence of rigid vegetation submerged in the flow. To achieve our research o...
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| Format: | Article |
| Language: | English |
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Wiley-VCH
2024-08-01
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| Series: | River |
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| Online Access: | https://doi.org/10.1002/rvr2.101 |
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| author | Kourosh Nosrati Hossein Afzalimehr Hamidreza Raeisifar Mohammad Nazari‐Sharabian Moses Karakouzian |
| author_facet | Kourosh Nosrati Hossein Afzalimehr Hamidreza Raeisifar Mohammad Nazari‐Sharabian Moses Karakouzian |
| author_sort | Kourosh Nosrati |
| collection | DOAJ |
| description | Abstract This research is centered on a comprehensive investigation into the impact of turbulence on the movement and dispersion of materials within a three‐dimensional (3D) bedform, specifically when there is a continuous presence of rigid vegetation submerged in the flow. To achieve our research objectives, we conducted extensive velocity measurements within a channel featuring this submerged vegetation. The measurements were carried out using an Acoustic Doppler Velocimeter (ADV). Additionally, our study delved into the intricate structures and turbulent characteristics of the flow, considering the coexistence of submerged vegetation and a 3D gravel pool. This pool featured entrance and exit slopes measuring 3 and 2.5°, respectively. Our experimental setup took place in a straight flume, measuring 14 m in length, 0.9 m in width, and 0.6 m in depth. The flume was equipped with transparent side walls to facilitate observations. Furthermore, our investigation extended to the spatial variations in velocity and turbulence distributions. We analyzed various parameters including turbulence kinetic energy, integral turbulence lengths, dispersion coefficients, and advective transport. The results revealed that integral length scales offer key insights into turbulent eddy behavior. In the presence of vegetation and a 3D bedform, turbulent eddies undergo notable changes, flattening in the longitudinal direction and expanding in the transverse and vertical directions. Moreover, longitudinal advection is notably higher compared to flows without vegetation in a uniform flow or bare channel, especially for z/H > 0.2. This indicates that the presence of vegetation and a 3D bedform leads to an increase in turbulent kinetic energy (k values) that surpasses the reduction in the time‐averaged velocity component (“U”) in the U × k term, thereby enhancing longitudinal advection. |
| format | Article |
| id | doaj-art-dad5d5724afb4b84ab4b5c21a6a30baf |
| institution | Kabale University |
| issn | 2750-4867 |
| language | English |
| publishDate | 2024-08-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | River |
| spelling | doaj-art-dad5d5724afb4b84ab4b5c21a6a30baf2024-11-20T12:31:16ZengWiley-VCHRiver2750-48672024-08-013326027110.1002/rvr2.101Submerged rigid vegetation effects on flow hydrodynamics within the pool morphologyKourosh Nosrati0Hossein Afzalimehr1Hamidreza Raeisifar2Mohammad Nazari‐Sharabian3Moses Karakouzian4Faculty of Civil Engineering Iran University of Science and Technology Tehran IranFaculty of Civil Engineering Iran University of Science and Technology Tehran IranFaculty of Civil Engineering Iran University of Science and Technology Tehran IranDepartment of Mathematics, Engineering, and Computer Science West Virginia State University Institute West Virginia USADepartment of Civil and Environmental Engineering University of Nevada Las Vegas Las Vegas Nevada USAAbstract This research is centered on a comprehensive investigation into the impact of turbulence on the movement and dispersion of materials within a three‐dimensional (3D) bedform, specifically when there is a continuous presence of rigid vegetation submerged in the flow. To achieve our research objectives, we conducted extensive velocity measurements within a channel featuring this submerged vegetation. The measurements were carried out using an Acoustic Doppler Velocimeter (ADV). Additionally, our study delved into the intricate structures and turbulent characteristics of the flow, considering the coexistence of submerged vegetation and a 3D gravel pool. This pool featured entrance and exit slopes measuring 3 and 2.5°, respectively. Our experimental setup took place in a straight flume, measuring 14 m in length, 0.9 m in width, and 0.6 m in depth. The flume was equipped with transparent side walls to facilitate observations. Furthermore, our investigation extended to the spatial variations in velocity and turbulence distributions. We analyzed various parameters including turbulence kinetic energy, integral turbulence lengths, dispersion coefficients, and advective transport. The results revealed that integral length scales offer key insights into turbulent eddy behavior. In the presence of vegetation and a 3D bedform, turbulent eddies undergo notable changes, flattening in the longitudinal direction and expanding in the transverse and vertical directions. Moreover, longitudinal advection is notably higher compared to flows without vegetation in a uniform flow or bare channel, especially for z/H > 0.2. This indicates that the presence of vegetation and a 3D bedform leads to an increase in turbulent kinetic energy (k values) that surpasses the reduction in the time‐averaged velocity component (“U”) in the U × k term, thereby enhancing longitudinal advection.https://doi.org/10.1002/rvr2.1013D pooladvectiondispersionintegral turbulent lengthsubmerged rigid vegetation |
| spellingShingle | Kourosh Nosrati Hossein Afzalimehr Hamidreza Raeisifar Mohammad Nazari‐Sharabian Moses Karakouzian Submerged rigid vegetation effects on flow hydrodynamics within the pool morphology River 3D pool advection dispersion integral turbulent length submerged rigid vegetation |
| title | Submerged rigid vegetation effects on flow hydrodynamics within the pool morphology |
| title_full | Submerged rigid vegetation effects on flow hydrodynamics within the pool morphology |
| title_fullStr | Submerged rigid vegetation effects on flow hydrodynamics within the pool morphology |
| title_full_unstemmed | Submerged rigid vegetation effects on flow hydrodynamics within the pool morphology |
| title_short | Submerged rigid vegetation effects on flow hydrodynamics within the pool morphology |
| title_sort | submerged rigid vegetation effects on flow hydrodynamics within the pool morphology |
| topic | 3D pool advection dispersion integral turbulent length submerged rigid vegetation |
| url | https://doi.org/10.1002/rvr2.101 |
| work_keys_str_mv | AT kouroshnosrati submergedrigidvegetationeffectsonflowhydrodynamicswithinthepoolmorphology AT hosseinafzalimehr submergedrigidvegetationeffectsonflowhydrodynamicswithinthepoolmorphology AT hamidrezaraeisifar submergedrigidvegetationeffectsonflowhydrodynamicswithinthepoolmorphology AT mohammadnazarisharabian submergedrigidvegetationeffectsonflowhydrodynamicswithinthepoolmorphology AT moseskarakouzian submergedrigidvegetationeffectsonflowhydrodynamicswithinthepoolmorphology |