scholarly journals Overtopping Risk Analysis of Earth Dams considering Effects of Failure Duration of Release Structures

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-15 ◽  
Author(s):  
Lijun Liu ◽  
Zhenyu Wu
Keyword(s):  
Risk Analysis ◽  
Safety Margin ◽  
Dam Safety ◽  
Earth Dams ◽  
Emergency Plans ◽  
Seismic Landslides ◽  
Rockfill Dam ◽  
The Earth ◽  
Dam Overtopping

For modern high earth dams, sufficient safety margin is considered in the designs of flood discharge capacity and dam crest elevation to prevent flood overtopping. However, for high earth dams which may induce catastrophic consequences, during their long operational period, extremely hazardous scenarios which could occur and threaten dam safety need to be considered. For the earth dams located in areas with intensive seismicity, there is a possible scenario that the release structures fail due to seismic landslides and gate failures caused by a severe earthquake when the flood begins to enter the reservoir. Thus, it is desirable to investigate the influence of failure duration of release structures on dam overtopping risk. Based on the Bayesian network, a methodology for overtopping risk analysis of earth dams considering effects of failure duration of release structures is proposed. The overtopping risk of the PBG earth-rockfill dam was analyzed to illustrate the methodology. The critical release structures which dominate the dam overtopping risk are identified. The dam overtopping risk is most sensitive to the failure duration of the spillway. The tolerable failure duration of the spillway is approximately 3 days, and when the failure duration of the spillway reaches 4 days, the dam overtopping risk drastically rises to an unacceptable level. The case study suggests that the proposed methodology could be helpful to analyze the influences of possible failure durations of release structures on dam overtopping risk and could facilitate preparation for emergency plans.

Assessing the earth dams’ effect on the groundwater of its location case study: Kord-Oliya dam

2020 ◽  
Vol 13 (22) ◽  
Author(s):  
Mandana Bayat ◽  
Saeid Eslamian ◽  
Gholamreza Shams ◽  
Alborz Hajiannia
Keyword(s):  
Earth Dams ◽  
The Earth

Risk Analysis for Dam Overtopping—Feitsui Reservoir as a Case Study

2007 ◽  
Vol 133 (8) ◽  
pp. 955-963 ◽  
Author(s):  
Jan-Tai Kuo ◽  
Ben-Chie Yen ◽  
Yung-Chia Hsu ◽  
Huei-Fen Lin
Keyword(s):  
Risk Analysis ◽  
Feitsui Reservoir ◽  
Dam Overtopping

scholarly journals Case Study: Risk Analysis by Overtopping During an Upstream Landslide in Peñitas Dam, Mexico

2019 ◽  
Author(s):  
Humberto J. F. Marengo ◽  
Alvaro A. Aldama
Keyword(s):  
Risk Analysis ◽  
Water Levels ◽  
Risk And Uncertainty ◽  
Empirical Formulas ◽  
Explicit Equation ◽  
Systematic Risks ◽  
Natural Dam ◽  
Risk And Reliability Analysis ◽  
Dam Overtopping

Abstract. Risk and uncertainty analysis by mathematical and statistical methods is often used to assess systematic risks and uncertainties. This research presents the procedure and application of risk and reliability analysis to dam overtopping (Peñitas) located downstream of a natural dam that could have failed. For the analysis are used six statistical variables and their uncertainties, the peak flood of the upstream dam, are evaluated with empirical formulas. The highest water levels of the break dam event were computed using reservoir routing with an explicit equation developed by the authors. Afterward, the overtopping risk analysis of Peñitas Dam was assessed for different stages of excavation of the natural dam that were made during making a sensitivity analysis of duration of dam break event, and also is calculated the possible upper elevation of Peñitas dam, finding that is a recommended practice measurement in similar further cases. A methodology to do an orderly and consistently analysis of risk is proposed to solve similar situations.

scholarly journals A Case Study On Gerugu Dam Overtopping Under Different PMP Scenarios

2013 ◽  
Vol 4 (1) ◽  
pp. 40-49
Author(s):  
Heng Hock Hwee ◽  
Hii Ching Poon
Keyword(s):  
Extreme Precipitation ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Dam Safety ◽  
Embankment Dam ◽  
Small Catchment ◽  
Safety Reason ◽  
Dam Overtopping ◽  
Supply Level

A hydrological dam safety inspection was carried out for existing Gerugu dam (CA= 14 km2) by evaluating the hydrological performance of the bellmouth spillway in light of two different sets of Probable Maximum Precipitation (PMP).  For safety reason, it is utmost important that the flood rise does not exceed the embankment dam crest level (ECL).  Gerugu dam (CA= 14 km2) is a small catchment earthfill zoned embankment dam that supplies raw waters to the water treatment plant downstream.  This study selects both “coastal” type of PMP [13], [14] which is mostly representative of the extreme precipitation parameters adopted in the design of the dam and a recent set of PMP under NAHRIM [11] study.  A catchment routing procedure is then used to translate the PMPs to PMFs for 1- to 120-hour duration and a conventional reservoir routing in tandem to estimate the outflows and corresponding flood rise over the full supply level (FSL) of the reservoir. The dam is considered safe under both coastal and NAHRIM [11] PMP scenarios as the flood rises for all cases are confined below the embankment crest level (ECL), i.e. +33.0 m msl. 

scholarly journals A Deterministic Monte Carlo Simulation Framework for Dam Safety Flow Control Assessment

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 505 ◽  
Author(s):  
Leanna M. King ◽  
Slobodan P. Simonovic
Keyword(s):  
Monte Carlo ◽  
Flow Control ◽  
Stochastic Approach ◽  
Dynamics Simulation ◽  
Dam Safety ◽  
Simulation Framework ◽  
Overtopping Failure ◽  
High Level ◽  
Dam Overtopping

Simulation has become more widely applied for analysis of dam safety flow control in recent years. Stochastic simulation has proven to be a useful tool that allows for easy estimation of the overall probability of dam overtopping failure. However, it is difficult to analyze “uncommon combinations of events” with a stochastic approach given current computing abilities, because (a) the likelihood of these combinations of events is small, and (b) there may not be enough simulated instances of these rare scenarios to determine their criticality. In this research, a Deterministic Monte Carlo approach is presented, which uses an exhaustive list of possible combinations of events (scenarios) as a deterministic input. System dynamics simulation is used to model the dam system interactions so that low-level events within the system can be propagated through the model to determine high-level system outcomes. Monte Carlo iterations are performed for each input scenario. A case study is presented with results from a single example scenario to demonstrate how the simulation framework can be used to estimate the criticality parameters for each combination of events simulated. The approach can analyze these rare events in a thorough and systematic way, providing a better coverage of the possibility space as well as valuable insights into system vulnerabilities.

Study on Estimating Failure Probability of Earth-Rock Dams

2012 ◽  
Vol 594-597 ◽  
pp. 1957-1960
Author(s):  
Rui Rui Sun ◽  
Xiao Ling Wang ◽  
Xue Fei Ao ◽  
Wei Ping Guo
Keyword(s):  
Risk Analysis ◽  
South China ◽  
Failure Probability ◽  
Failure Modes ◽  
Safety Management ◽  
Risk Identification ◽  
Dam Failure ◽  
Dam Safety ◽  
Risk Quantification ◽  
The Earth

Dam safety based on risk analysis methodologies demands risk quantification of the earth-rock dam project, and estimation on the failure probability of earth-rock dams is a major concern in the dam safety management. Due to numerous uncertainties, structures of the reservoir are involved leading to risks that may finally cause dam failure. The risk identification was firstly investigated according to the actual project. Subsequently, method of expertise was presented to estimate odds of the presence of each link in dam failure modes quantitatively. The reservoir composed of several dams in South China was taken as a case. The failure probabilities of each dam were obtained and results showed that risk of No.5 dam was relatively higher in all the dams. The research is of great significance to the dam safety management.

Karpophoroi deities and the Attic cult of Ge. Notes on IG II2 4758

2014 ◽  
Vol 7 ◽  
pp. 193-203
Author(s):  
Jenny Wallensten
Keyword(s):  
The Earth ◽  
And Function

Karpophoros, fruit-bearing, is an epithet easily considered as “literary”, i.e., a poetic name with little or no relation to cult. The epigraphic sources, however, clearly show us that gods thus named were offered divine worship. The epithet is found in connection with several deities. Goddesses of agriculture, such as Demeter, and Ge, the Earth, naturally carry this name, but so do Zeus, Dionysos and a goddess known as “The Aiolian”, who was sometimes associated with Agrippina. This paper surveys deities known as karpophoroi and examines what their cult entailed. Its focus is, however, on a brief Acropolis inscription, IG II2 4758, where Ge is honoured as Karpophoros, in accordance with an oracle. The case study provides insights into the Attic cult of Ge, the epithet Karpophoros, as well as the use and function of epithets within Greek dedicatory language.

Risk Analysis for Dam Safety Evaluation: Hydrologic Risk.

1996 ◽  
Author(s):  
Jery Stedinger ◽  
David C. Heath ◽  
Kay Thompson
Keyword(s):  
Risk Analysis ◽  
Safety Evaluation ◽  
Dam Safety
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