7 results
Search Results
2. Effect of armor layer on the local scour formation induced by a deeply submerged circular wall jet in confined channels.
- Author
-
Hernandez, Homero, Azimi, Amir H., and Mostaani, Arsalan
- Subjects
TURBULENT jets (Fluid dynamics) ,FROUDE number ,EROSION ,FLUIDIZED-bed combustion - Abstract
A series of laboratory experiments was conducted in a confined channel to study the effect of armor layer on the scour formation induced by a deeply submerged circular turbulent wall jet. A wide range of particle sizes was utilized to form an armor layer and the local erosion downstream of a circular wall jet was measured. The time evolution of scour dimensions was recorded and the scour profiles of the mixed bed were compared with the scour profiles of a relatively uniform sand bed with the same average particle size. Three regimes were identified as the initial stage (Regime I), the quasi-steady state (Regime II), and the steady state (Regime III). The characteristic lengths of the scour showed rapid growth at the early stage of scour development and the growth rate decreased until the scour reached the steady-state condition. The effect of armor layer on scour dimensions was pronounced, which significantly reduced the maximum scour depth due to formation of an armor layer. The characteristic parameters affecting the maximum scour depth and width were identified and empirical correlations were introduced for the prediction of scour dimensions. The scour profiles in the mixed bed showed two consecutive scour depths. It was found that the area occupied by the armor layer increased by increasing the Froude number of the jet. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
3. Automatic incorporation of riverbank failures in two-dimensional flood modeling
- Author
-
Tew-Fik Mahdi and Ismail Ouchebri
- Subjects
Hydrology ,010504 meteorology & atmospheric sciences ,Flood myth ,Hydraulics ,0208 environmental biotechnology ,Sediment ,Landslide ,02 engineering and technology ,01 natural sciences ,020801 environmental engineering ,law.invention ,law ,Erosion ,Channel bank ,Deposition (chemistry) ,Geology ,0105 earth and related environmental sciences ,General Environmental Science ,Civil and Structural Engineering - Abstract
Riverbanks undergo changes caused not only by river hydraulics, mainly sediment erosion and deposition processes, but also by the possible landslides that eventually change the channel bank profiles. Those failures are an important form of alluvial channel adjustments but are usually difficult to include during morphodynamic modeling. This paper proposes a novel approach combining a 2D depth-averaged hydrodynamic, sediment transport and mobile-bed model, SRH-2D, a limit equilibrium slope-stability model, BISHOP, and a bank failure sediment redistribution submodel, REDISSED, into a fully automatic and continuous dynamic simulation to predict vertical bed and lateral bank changes for a river reach undergoing exceptional flooding. The in-stream vertical fluvial changes predicted with the SRH-2D model will be automatically used to update the riverbank geometry profile by profile and assess their geotechnical stability to rotational slip failures with a developed slope-stability model based on Bishop’s simplified method. A cone-shaped sliding area is defined in case the driving forces exceed the stabilizing forces. All mesh nodes located within the mass wasting zone will be automatically updated, allowing a new bank face form. The failed materials will be redistributed in the transect according to the geometry of the landslides observed at the study site. The Outaouais River at Notre-Dame-Du Nord, Quebec, is used to test the coupling procedure. Up to 100 m of bank retreat was predicted, and more than 20 cross-sections were reshaped. Typical results showing the effectiveness of the developed framework are presented and discussed.
- Published
- 2021
4. Blockage correction for pier scour experiments.
- Author
-
Williams, Priscilla, Bolisetti, Tirupati, and Balachandar, Ram
- Subjects
DESIGN & construction of building foundations ,BRIDGE foundations & piers ,SCOUR (Hydraulic engineering) ,SCOUR at bridges ,FLOW velocity - Abstract
Copyright of Canadian Journal of Civil Engineering is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2018
- Full Text
- View/download PDF
5. Erosion characteristics and stochastic nature of bed shear stress in underwater mine tailings.
- Author
-
Geremew, Africa M.
- Subjects
METAL tailings ,EROSION ,SHEARING force ,MATERIAL plasticity ,MINE waste - Abstract
Copyright of Canadian Journal of Civil Engineering is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2017
- Full Text
- View/download PDF
6. Toward best practices for construction and maintenance of through-grade culverts to mitigate pavement roughness.
- Author
-
Kavanagh, Leonnie, Soliman, Haithem, and Shalaby, Ahmed
- Subjects
CULVERTS ,EMBANKMENT design & construction ,MAINTAINABILITY (Engineering) ,STRENGTH of materials ,EROSION - Abstract
Copyright of Canadian Journal of Civil Engineering is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2016
- Full Text
- View/download PDF
7. Possible effects of the 1984 St. Clair River ice jam on bed changes.
- Author
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Tomasz Kolerski and Hung Tao Shen
- Subjects
ICE jams (Geology) ,RIVER channels ,COMPUTER simulation ,SHEARING force ,MATHEMATICAL models ,ICE on rivers, lakes, etc. ,EROSION - Abstract
Copyright of Canadian Journal of Civil Engineering is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2015
- Full Text
- View/download PDF
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