A comprehensive study on dam-break flow over dry and wet beds

Khoshkonesh, Alireza; Nsom, Blaise; Gohari, Alireza; Banejad, Hossein

doi:10.1016/j.oceaneng.2019.106279

Cited by 42 publications

(10 citation statements)

References 33 publications

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“…Even though dams are constructed with well-improved engineering knowledge and construction qualities for different purposes, they can be broken and cause severe damage to humans and their properties (Haghshenas, et al, 2016). The overturning of the still water column in a reservoir as a result of the removal of the sluice gate will represent an ideal sudden dam break which can introduce a mechanism that involves creating and formulating rapid unsteady flow (Khoshkonesh, et al, 2019). Terrible damages may cause for both human life and the properties due to the failures associated with the dams (Li and Zhao, 2018).…”

Section: Dam Breaksmentioning

confidence: 99%

Functional characteristics of an early warning system to minimise the risks of dam breaks in Sri Lanka

Weerasinghe¹,

Thayaparan²,

Fernando³

2022

Proceedings of 10th World Construction Symposium 2022

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Dams have become a very important infrastructure that provides enormous benefits to the economy of the country. Even though dams are very important and significant structures within a country, their breaks can cause severe damage to the country’s economy, society, and environment. Other than that, it can be impacted human life by causing deaths. As a come-up strategy, early warning systems can be used to reduce the severe impacts of dam breaks. Early warning systems (EWS) have been identified as a very important tool used to save lives and properties from disasters. Hence, this paper attempts to identify the functional characteristics of an EWS that can be used to reduce the impacts of dam breaks in Sri Lanka. An extensive literature survey was conducted to achieve the primary objective of this paper. Accordingly, the paper has identified the major purposes of dams, the causes for the dam breaks, and the impacts of dam breaks on the economy, society, and the environment. Then, the paper explores the functional characteristics of the EWS which is used for dam breaks. Finally, a conceptual framework has been developed with the key literature findings of the paper in order to minimise the social, economic, and environmental impacts created by dam breaks using early warning systems in Sri Lanka. As such, this paper will be a value addition to support the country’s economy, society, as well as environment.

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Section: Dam Breaksmentioning

confidence: 99%

Functional characteristics of an early warning system to minimise the risks of dam breaks in Sri Lanka

Weerasinghe¹,

Thayaparan²,

Fernando³

2022

Proceedings of 10th World Construction Symposium 2022

View full text Add to dashboard Cite

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“…Previous studies have shown that the propagation of dam-break flows is influenced by various factors, among them, fluid rheological properties, bed slope, topographical variations and downstream fluid levels, see [5][6][7][8][9][10][11][12] and references therein. These factors play an important role in determining the maximum height and speed of flow downstream.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulations of dam-break flows of viscoplastic fluids via Shallow Water equations

Muchiri

Hewett

Sellier

et al. 2023

Preprint

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This paper presents simulations of channelized dam-break flows of Herschel–Bulkley viscoplastic fluids over complex topographies using the Shallow Water equations (SWEs). Particularly, the study aims at assessing the effects of rheological parameters: power-law index (n), consistency index (K) and yield stress (\tau_{c}), on the flow height and velocity over different topographies. Three practical examples of dam-break flow cases are considered: a dam-break on an inclined flat surface, a dam-break over a non-flat topography, and a dam-break over a wet bed. Effects of the bed slope and depth ratios between upstream and downstream fluid levels, on the flow behaviour are also analyzed. Numerical results are compared with experimental data from the literature, and are found to be in good agreement. Results show that for both dry and wet bed conditions, the fluid front position, the peak height, and mean velocity decrease when any of the three rheological parameters is increased. However, based on parametric sensitivity analysis, the power-law index appears to be the dominant factor in dictating the fluid behaviour. Moreover, increasing the bed slope and/or the depth ratio, the wave frontal position moves further downstream. Furthermore, the presence of an obstacle is observed to cause the formation of an upsurge that moves in the upstream direction; which increases by increasing any of the three rheological parameters. The study is useful for an in-depth understanding of the effects of rheology on catastrophic gravity driven flows of non-Newtonian fluids (like lava or mud flows) for risk assessment and mitigation.

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“…However, to prevent the cavitation erosion damage, the shape of traditional spillways must be improved. With the development of the roller compacted concrete dam technique, the laddershaped spillways have been widely applied during the last 30 years [3,4]. ey are characterized by good energy dissipation efficiency, low cost, and a small level of effort in construction [5,6].…”

Section: Introductionmentioning

confidence: 99%

The Experimental Investigation of the Optimization of the Flow State of a Ladder-Shaped Spillway in a Certain Reservoir

Zhang

et al. 2022

Geofluids

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The original design scheme of ladder-shaped spillways in certain reservoirs is improved by using a hydraulic similar model experiment. The results of the original scheme demonstrate that the stilling basin cannot meet the requirement of safe discharge, and the flow state at the end of the stilling basin is violent and chaotic. The experimental method of the physical model was used to optimize the design of the spillway without changing the original plane layout. First, three steps in the ladder are added. The stilling basin is then replaced by the torsion plane. Finally, the longitudinal slope of the tail channel section is altered, and an experimental investigation on the flow state and energy dissipation rate is performed. The conclusions are drawn that the flow state of the water is obviously improved, and the energy dissipation rate increases; the optimal scheme produces the expected effects.

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A comprehensive study on dam-break flow over dry and wet beds

Cited by 42 publications

References 33 publications

Functional characteristics of an early warning system to minimise the risks of dam breaks in Sri Lanka

Functional characteristics of an early warning system to minimise the risks of dam breaks in Sri Lanka

Numerical simulations of dam-break flows of viscoplastic fluids via Shallow Water equations

The Experimental Investigation of the Optimization of the Flow State of a Ladder-Shaped Spillway in a Certain Reservoir

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