A rapid method for predicting embankment breach hydrographs

Damme, Myron van; Morris, Mark W.; Borthwick, Alistair G.L.; Hassan, Mona

doi:10.1201/b13715-52

Cited by 3 publications

(4 citation statements)

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“…Water moving through the channel creates some shear stress τ, N/m 2 . When the critical value τ c (Equation ( 7)) is exceeded, the process of erosion begins [29,30]. Since the time step is 1 s, the channel increment ∆l(t) is equal to the erosion rate E(t), as follows:…”

Section: Methodsmentioning

confidence: 99%

“…where g is the acceleration of gravity (9.81 m/s 2 ); 𝜔(𝑡) is the cross-sectional area of the channel, which is calculated as ( ) , where D(t) is the channel diameter (m); water pressure H(t) indicates the difference between the water elevation in the flow (m), z(t), and the expected elevation of the channel centre 𝑧 (m); and ℎ is the pressure loss along the length of the channel, which is calculated as ℎ = 1 + , where L is the channel length (m), R is the hydraulic channel radius (m), and f is a friction-dependent parameter, which is calculated as 𝑓 = 0.2162 × ( ) / , with 𝐷 being the average diameter of the soil particles (m) [2,29].…”

Section: Methodsmentioning

confidence: 99%

“…, where D(t) is the channel diameter (m); water pres-(t) indicates the difference between the water elevation in the flow (m), z(t), and the ted elevation of the channel centre 𝑧 (m); and ℎ is the pressure loss along the h of the channel, which is calculated as ℎ = 1 + , where L is the channel length is the hydraulic channel radius (m), and f is a friction-dependent parameter, which culated as 𝑓 = 0.2162 × ( ) / , with 𝐷 being the average diameter of the soil les (m) [2,29]. he increment in channel diameter Δl(t) (Figure 2) is determined by the erosion rate o calculate the erosion of the moraine material by water flow, we used Equation (3), y used in foreign mathematical models [16,30,31]:…”

Section: Methodsmentioning

confidence: 99%

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Modelling of a Lake Outburst as a Result of the Development of Piping

Pryakhina,

Rasputina,

Svirepov

2024

Water

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The retreat of mountain glaciers inevitably leads to an increase in the number of outburst moraine lakes. One of the possible mechanisms of moraine dam outburst along with overflow over the crest is the formation of a filtration channel in the body of the moraine dam (piping). An algorithm for calculating the outburst flood hydrograph, describing the development of a filtration channel in the body of a moraine dam and the subsequent formation of water overflow when the soil above the channel collapses, is proposed in this paper. Verification of proposed methodology was carried out on the basis of experimental data and published data of real outbursts. Satisfactory results verifying this methodology made it possible to use the proposed methodology for the calculation of the hydrograph of the outburst of Lake Bashkara in the Elbrus region, which occurred on 1 September 2017. It is shown that the simulation results are quantitatively comparable with the estimates obtained from field data: the time of water discharge through the channel was 16 min, the period of the outburst wave passage was 40 min, and the maximum discharge was 636 m3/s. Thus, the possibility of applying the proposed methodology for calculating the destruction of natural moraine dams has been demonstrated.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Modelling of a Lake Outburst as a Result of the Development of Piping

Pryakhina,

Rasputina,

Svirepov

2024

Water

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“…Although they are widely considered to be a significant simplification and not appropriate for local studies or studies that require the inflow hydrograph to be estimated. The representation of breach processes can clearly be improved within RASP, for example van Damme 2012 introduced a rapid breach model that is expressly designed for use within flood risk models 36 ; but the associated impact on the national risk estimates remains difficult to determine.…”

Section: Performance Of Individual Model Componentsmentioning

confidence: 99%

Believe it or not? The challenge of validating large scale probabilistic risk models

Sayers¹,

Lamb

Panzeri

et al. 2016

E3S Web Conf.

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Abstract. The National Flood Risk Assessment (NaFRA) for England and Wales was initially undertaken in 2002 with frequent updates since. NaFRA has become a key source of information on flood risk, informing policy and investment decisions as well as communicating risk to the public and insurers. To make well informed decisions based on these data, users rightfully demand to know the confidence they can place in them. The probability of inundation and associated damage however cannot be validated in the traditional sense, due the rare and random nature of damaging floods and the lack of a long (and widespread) stationary observational record (reflecting not only changes in climate but also the significant changes in land use and flood defence infrastructure that are likely to have occurred). To explore the validity of NaFRA this paper therefore provides a bottom-up qualitative exploration of the potential errors within the supporting methods and data. The paper concludes by underlining the need for further research to understand how to robustly validate probabilistic risk models.

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A flood risk analysis model with topographical inundation and life-loss

Gouldby¹,

Lhomme²,

Jamieson³

et al. 2015

Proceedings of the Institution of Civil Engineers - Water Manag

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Quantified models of flood risk that incorporate an explicit representation of the performance of flood defence infrastructure are becoming an increasingly important component of efforts to manage flood risk. The models have been applied to support a wide range of decisions, including long-term strategic planning, assessment of investment needs and shorter-term asset management. The model currently applied in practice by the Environment Agency in England and Wales makes a number of simplifying assumptions to achieve computationally practical run-times. One of these simplifications relates to the volume-based flood-spreading algorithm that is applied. This paper describes the implementation of a new time-based inundation model within the existing risk analysis modelling approach. The new inundation model offers a significant increase in the representation of the physical processes within the flood simulation component of the risk analysis model. It also offers new outputs in terms of estimates of maximum depths and flood velocities. Velocities are known to be an important factor in flood-related fatalities. A simplified method to estimate life-loss has been combined with new output from the improved inundation model to illustrate how estimates of risk to life could be provided.

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A rapid method for predicting embankment breach hydrographs

Cited by 3 publications

References 0 publications

Modelling of a Lake Outburst as a Result of the Development of Piping

Modelling of a Lake Outburst as a Result of the Development of Piping

Believe it or not? The challenge of validating large scale probabilistic risk models

A flood risk analysis model with topographical inundation and life-loss

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