An experimental study of bedload transport in partially ice-covered channels
| dc.contributor.author | Rouzegar, Mina | |
| dc.contributor.examiningcommittee | Dow, Karen (Civil Engineering) | |
| dc.contributor.examiningcommittee | Asadzadeh, Masoud (Civil Engineering) | |
| dc.contributor.examiningcommittee | Ettema, Robert (Civil and Environmental Engineering, Colorado University) | |
| dc.contributor.supervisor | Clark, Shawn | |
| dc.date.accessioned | 2024-08-29T19:08:39Z | |
| dc.date.available | 2024-08-29T19:08:39Z | |
| dc.date.issued | 2024-07-31 | |
| dc.date.submitted | 2024-08-29T18:26:29Z | en_US |
| dc.degree.discipline | Civil Engineering | |
| dc.degree.level | Doctor of Philosophy (Ph.D.) | |
| dc.description.abstract | The onset of winter in cold climates often leads to the formation of border ice along riverbanks, a phenomenon that can persist for a significant portion of the winter season, thereby affecting river channels' dynamics and geomorphological structure. Understanding the effects of ice cover on sediment transport and bed morphology is crucial, as these elements significantly influence flow resistance and river behavior. While there is extensive literature on sediment transport and bed morphology in open channel flow and several studies in conditions of complete ice cover, research in partially ice-covered channels is sparse. To address this gap, the current study conducted laboratory experiments at the Hydraulics Research and Testing Facility at the University of Manitoba, Canada. The research aimed to explore the effects of border ice, including the extent of ice cover, variations in flow strength, and the asymmetry of border ice on bedload transport rate and distribution, as well as bed morphology and bedform characteristics. Various experimental setups, ranging from open channel flows to symmetric and asymmetric border ice and fully ice-covered conditions, were analyzed to assess bedform dimensions and bedload transport rates against theoretical models in the literature. This comparison confirmed the reliability of the models in describing bedform features under varying ice conditions. Moreover, despite noticeable differences in bedload transport rates across the channel width, in partially ice-covered conditions, the cross-section-averaged bedload transport rate could still be accurately estimated using conventional equations adapted for open channel and fully ice-covered flows by adjusting for the additional boundary created by the ice in the calculation of the wetted perimeter. The findings also demonstrate that the presence, positioning, and varying extents of partial ice cover significantly influence bedforms within the channel and the distribution of bedload transport. Notably, the impact of ice coverage is more pronounced at lower flow strengths and diminishes as flow strength increases. This research provides essential insights into the complex interactions between ice cover and sediment transport. | |
| dc.description.note | October 2024 | |
| dc.identifier.uri | http://hdl.handle.net/1993/38453 | |
| dc.language.iso | eng | |
| dc.rights | open access | en_US |
| dc.subject | Sediment transport | |
| dc.subject | Bedload | |
| dc.subject | Ice-covered channel | |
| dc.subject | Border ice | |
| dc.subject | asymmetric border ice | |
| dc.subject | Bed form | |
| dc.subject | River morphology | |
| dc.title | An experimental study of bedload transport in partially ice-covered channels | |
| dc.type | doctoral thesis | en_US |
| local.subject.manitoba | no |