An experimental investigation of dam-break induced flood waves for different density fluids

Özmen-Çağatay, Hatice; Turhan, Evren; Kocaman, Selahattin

doi:10.1016/j.oceaneng.2021.110227

Cited by 12 publications

(3 citation statements)

References 47 publications

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“…The time step of the model has a higher influence on the total computational time as it denotes the time taken by the fluid to pass a cell (Lavoie & Mahdi, 2017; Ozmen‐Cagatay et al, 2022). Large time steps would cause numerical diffusion and model instability in addition to attenuation of peak, whereas very small time steps would yield more computational time and possible model instability (Gaagai et al, 2022; Haltas, Tayfur, & Elci, 2016; Tedla et al, 2021).…”

Section: Time Stepmentioning

confidence: 99%

“…Variable time steps primarily improve stability and reduce computational time and this feature is enabled in software such as TELEMAC‐2D, HEC RAS for 2D models (Grover et al, 2013) as well as in 3D models (FLOW‐3D). In here, the time step is automatically adjusted by respecting the Courant–Friedrichs–Lewy (CFL) stability criterion (Ozmen‐Cagatay et al, 2022). Pilotti et al (2020) used a variable time step for the 2D model to advance the simulation in time.…”

Section: Time Stepmentioning

confidence: 99%

“…In addition, dam failures introduce a known volume of water at a point located in a stream network and are short-lived with a rapid variation of pressure and velocity in both time and space (Carrivick, 2010), which significantly differentiate its devastating potential from other floods. In Ozmen-Cagatay et al (2022), dam breach floods are characterized hydraulically as unsteady, nonuniform, nonlinear, and rapidly varied flow phenomena similar to a Tsunami. As a consequence, the momentum of the developed dam breach flow would create a high impact force in the downstream areas.…”

Section: Introductionmentioning

confidence: 99%

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Review on model development techniques for dam break flood wave propagation

Peramuna,

Neluwala,

Wijesundara

et al. 2023

WIREs Water

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Catastrophic failure of dam structures has often led to severe consequences. The colossal wave receding at a higher velocity from the sudden failure of the dams may obliterate the downstream areas causing loss of lives and property damage. Thus, proper mitigation measures and contingency plans must be formulated beforehand to minimize the impact of such disasters. Consequently, there has been a strong tendency to study dam breach flood modeling using different approaches for both hypothetical dam breach scenarios and real incidents. The technology used for dam breach studies is advancing and a comprehensive review of the existing methodologies would help the modelers in their model development. This paper reviews the state‐of‐the‐art methodologies utilized in studies to propagate the dam break flood wave. Furthermore this guides the selection of methods best suited considering the project‐specific requirements and the complexity of project to simulate the risk to the vulnerable areas generated from the dam break flood flow. Different terrain datasets, mesh generation techniques and calibration techniques have been adapted and adhered to improve computational accuracy, stability and efficiency in modeling dam break floods. The use of high‐resolution global and site‐specific datasets, subgrid models, the choice of roughness coefficients and high‐resolution time steps have to be investigated thoroughly in these models. The paper reviews the existing methodologies with the strengths and limitations facilitating the future dam breach modelers to select the suitable approach in dam break flood wave modeling.This article is categorized under: Engineering Water > Sustainable Engineering of Water Science of Water > Water Extremes Water and Life > Conservation, Management, and Awareness

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Section: Time Stepmentioning

confidence: 99%

Section: Time Stepmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Review on model development techniques for dam break flood wave propagation

Peramuna,

Neluwala,

Wijesundara

et al. 2023

WIREs Water

View full text Add to dashboard Cite

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Dam break flow through rigid-emergent vegetation

Mahmoud,

Uchida

2024

Exp Fluids

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Dam failures pose a significant threat to life and property. This study investigates the potential of rigid emergent vegetation to attenuate dam break waves, reducing their destructive impact. Experiments explored the effect of varying vegetation field lengths on wave propagation. Wooden cylinders with consistent diameter (1.0 cm) and density (0.067) simulated the rigid vegetation in a straight, flat rectangular channel. Four different vegetation lengths and three bore conditions for different reservoir and tailwater depths were examined to analyze their influence on dam break wave behavior. The results demonstrate the effectiveness of vegetation in dissipating wave energy, leading to a rapid decrease in wave height and celerity. Interestingly, increasing vegetation length significantly attenuates the wave height downstream of the vegetation zone, while having no significant impact on the reflection wave height upstream of the vegetation. This finding highlights the targeted effectiveness of strategically placed vegetation in shielding downstream areas. The study also clarifies that celerity can be calculated using shallow water equations for both upstream and downstream regions with wave height and tailwater depth. However, within the vegetation, drag forces significantly reduce celerity. A novel equation, derived from wavefront profiles, was proposed and validated to accurately calculate celerity within the vegetation field. These findings provide valuable data for validating numerical models simulating dam break wave interactions with vegetation. Graphical abstract

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Investigating the Non-Linear Effects of Breach Parameters on a Dam Break Study

Marangoz,

Anılan,

Karasu

2024

Water Resour Manage

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When settlements are located close to a dam, it is important to accurately predict the breach peak flow and the time to reach the peak. Therefore, the prediction of dam breach properties is essential in dam break studies. Dam breach parameters such as the breach side slope, final bottom width, final bottom elevation, weir coefficient, breach formation time, and initial elevation of reservoirs are the key variables for estimating the peak discharge during a dam break scenario. In this study, these six breach parameters were analyzed to investigate the impact of breach parameters on breach peak flow and the time to reach the peak. Thus, several scenarios were calculated and compared for Atasu Dam. The results revealed that the role of the initial water elevation, final bottom elevation, and breach development time had more of an impact on the breach peak flow and the time to reach the peak. In addition, the study indicated that the final bottom width and breach weir coefficient were less sensitive to both the peak discharge and peak discharge time. Furthermore, the analysis indicated that the breach side slope parameter had no major influence on the time to peak while also having an insignificant impact on the peak discharge. Understanding this breach mechanism provides a basis for relevant research in designating key parameters for dam break analysis. Thus, the results can contribute to decision making toward the design of flood mitigation and dam emergency action planning.

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An experimental investigation of dam-break induced flood waves for different density fluids

Cited by 12 publications

References 47 publications

Review on model development techniques for dam break flood wave propagation

Review on model development techniques for dam break flood wave propagation

Dam break flow through rigid-emergent vegetation

Investigating the Non-Linear Effects of Breach Parameters on a Dam Break Study

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