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CFD modeling of geobag stability for riverbank erosion protection structures
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- Author / Creator
- Shabani, Saman
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Riverbank erosion poses significant environmental and infrastructural challenges, including soil loss, damage to infrastructure, flooding, and threats to wildlife and vegetation. Erosion control structures are essential for mitigating this issue, and geobags
have been used as a fundamental element of revetment structures since the 1970s.
The use of geobags offers numerous advantages over traditional rip-rap, such as longterm durability, cost-efficiency, eco-friendliness, and environmental safety. One of the
key benefits of geobag revetments is the stability they provide for communities living
along riverbanks, fostering economic development in the surrounding areas. To ensure
the effective design of such structures, a comprehensive understanding of geobag stability under hydraulic loading conditions is crucial. Despite numerous fluvial studies
focusing on the stability of geobags, none have specifically investigated the drag and
friction forces acting on a single bag under current loading conditions. Additionally,
no computational fluid dynamics (CFD) study has previously simulated the motion
and movement of submerged geobags. In order to fill this knowledge gap, the present
study employed a transient CFD model to simulate the movement of geobags at the
bottom of the channel, utilizing the technique of Overset mesh. The image processing technique is also implemented to determine the exact edges and shape of bags
before failure at the bottom of the channel. Through the simulation, the drag and
friction force affecting a single geobag were determined. The effects of shape, material
and filling ratio of the geobags were investigated. Ultimately, the failure velocity of
geobags which follow the same shape was determined. -
- Subjects / Keywords
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- Graduation date
- Fall 2023
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- Type of Item
- Thesis
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- Degree
- Master of Science
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- License
- This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.