Investigating scale effects on breach evolution of overtopped sand embankments

Mohamed, Mohamed Mohamed Abdellatif; El-Ghorab, Entesar Abdallh Soliman

doi:10.1016/j.wsj.2016.10.003

Cited by 14 publications

(3 citation statements)

References 5 publications

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“…The test data set that was used in fracture model was abundant and reliable. Of course, it must be noted that the scale effect of the breach model is too small to neglect because the patterns of flood evolution in a breach are the same with different model scales by estimating the scale effect of the breach model test [15,16]. Therefore, the test results data can be combined with a statistical analysis of prototype observations.…”

Section: Research Ideasmentioning

confidence: 99%

The Hydraulic and Boundary Characteristics of a Dike Breach Based on Cluster Analysis

Liu

Luo

Qiao

et al. 2023

Water

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It is important to determine the hydraulic boundary eigenvalues of typical embankment breaches before carrying out research on their occurrence mechanisms and assessing their repair technology. However, it is difficult to obtain the hydraulic boundary conditions of the typical levee breaches accurately with minor or incomplete measured data due to the complexity and instability of the levee breach. Based on more than 100 groups of domestic and foreign test data of embankment/earth dam failures, the correlation between the hydraulic boundary eigenvalues of a breach was established based on the cluster analysis approach. Additionally, the missing values were imputed after correlating and fitting. Meanwhile, the hydraulic boundary parameters and the related equations of a generalized typical breach were obtained through the statistical analysis of the probability density of the dimensionless eigenvalues of the breach. The analysis showed that the width of the breach mainly ranges in 20~100 m, while the water head of the breach is 4~12 m, and the velocity of the breach is 2~8 m/s. The distribution probabilities of all them are about 64~71%. The probability density of the width-to-depth ratio and the Froude number of the breach are both subject to normal distribution characteristics. The distribution frequency of the width-to-depth ratio of 3~8 is approximately 55%, and the Froude number of 0.4~0.8 is approximately 60%. These methods and findings might provide valuable support for the statistical research of the boundary and hydraulic characteristics of the breach, and the closure technology of breach.

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Section: Research Ideasmentioning

confidence: 99%

The Hydraulic and Boundary Characteristics of a Dike Breach Based on Cluster Analysis

Liu

Luo

Qiao

et al. 2023

Water

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“…Overtopping had been of particular interest in the last few decades due to the protection from potential environmental damages and the loss of property [9][10][11][12][13]. However, actual measurements of overtopping erosion is a costly and time-consuming process that is usually limited to small experimental tests [14][15][16][17][18]. The main influence of overtopping on dam is the erosion by water, so the characteristic of soil erosion is very important to study and many people focused on the soil erosion in recent years.…”

Section: Introductionmentioning

confidence: 99%

Overtopping Failure of a Reinforced Tailings Dam: Laboratory Investigation and Forecasting Model of Dam Failure

Jing

Chen

Williams

et al. 2019

Water

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Overtopping failure of reinforced tailings dam may cause significant damage to theenvironment and even loss of life. In order to investigate the feature of overtopping of the reinforcedtailings dam, which has rarely appeared in the literature, the displacement, the phreatic level and theinternal stress of dam during overtopping were measured by a series of physical model tests. Thisstudy conclusively showed that, as the number of reinforcement layers increased, the anti-erosioncapacity of tailings dam was notably improved. It could be supported by the change of the dimensionof dam breach, the reduction of stress loss rate, and the rise of phreatic level from the tests. Based onthe erosion principle, a mathematical model was proposed to predict the width of the tailings dambreach, considering the number of reinforcement layers. This research provided a framework for theexploration of the overtopping erosion of reinforced tailings dam, and all presented expressions couldbe applied to predict the development of breach during overtopping.

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“…Affecting severely the local infrastructure as well as transport and logistic operations, such phenomena are recognized as especially dangerous and, therefore, relevant to study. Different methods, such as field studies, airborne photography interpretation, physical modelling (Tingsanchali and Chinnarasri, 2001;Zhu et al, 2004Zhu et al, , 2011Mohamed and El-Ghorab, 2016; de Haas et al, 2018;Wang et al, 2018) and mathematical modelling (Röthlisberger, 1972;Nye, 1976;Björnsson, 1992Björnsson, , 1998Walder and Fowler, 1994;Clarke, 2003;Fowler, 2009;Hewitt, 2011), are used for the research of outburst floods.…”

Section: Introductionmentioning

confidence: 99%

Lake outbursts of the eastern part of the Larsemann Hills, East Antarctica, through snow and ice dams

Боронина

Popov

Pryakhina

2019

Preprint

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Abstract. The Antarctic oasis Larsemann Hills is characterized by a developed drainage system. It includes several lakes of different genesis. However, besides the state of knowledge of this region and regular expeditions, which are conducted nowadays, the lakes of this oasis have not been studied comprehensively yet. In general, international and Russian research is dedicated to the monitoring of the ecological state of the water bodies, inferring climate change signals from the lake deposits. At the same time, works related to determination of the bathymetry and morphology of water bodies do not virtually exist or are hidden in scientific-technical reports of the Antarctic Programs of different countries. Interest in the investigation of the oasis lakes has increased sharply after the formation of a vast depression on on Dålk Glacier (Larsemann Hills, East Antarctica) on 30 January 2017 caused by the outburst of intraglacial reservoir. Field research in 2017/18 revealed that sudden destructions of impound dams and the generation of breakthrough floods are indicative for many lakes of the oasis. Thus, the present work aims at the application of mathematical modeling methods to shed light on the processes that lead to dam destruction and the outburst of lakes temporarily impounded by natural firn-ice and glacial dams. Such discharges are comparable to jökulhlaups and can be calculated using the adapted model of Yu.B. Vinogradov. As main objects of this research we select among the lakes located close to Russian and foreign Antarctic stations and field bases those, for which destructions of ice-snow bridges are detected. According to the modelling results, the following characteristics were identified for every outburst: the distribution of the discharges over time, the volume and transmission time of the flood. Moreover, its catastrophic risk and fracture force was assessed. The data obtained will form a basis for studying the formation of temporary ice hydrographic networks in Antarctica and the analogous processes occurring under the Arctic glaciers.

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Investigating scale effects on breach evolution of overtopped sand embankments

Cited by 14 publications

References 5 publications

The Hydraulic and Boundary Characteristics of a Dike Breach Based on Cluster Analysis

The Hydraulic and Boundary Characteristics of a Dike Breach Based on Cluster Analysis

Overtopping Failure of a Reinforced Tailings Dam: Laboratory Investigation and Forecasting Model of Dam Failure

Lake outbursts of the eastern part of the Larsemann Hills, East Antarctica, through snow and ice dams

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