Reliability analysis of riprap stability around bridge piers

Tabarestani, Mojtaba Karimaei; Zarrati, Amir Reza

doi:10.1080/23249676.2018.1497556

Cited by 7 publications

(4 citation statements)

References 22 publications

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“…Case B Hydraulic uncertainties due to the estimation of hydraulic factors like the wave height and period for the armor design: This kind of uncertainty increases with the increasing the storm return period [22,23]. Since the wave characteristics have been simulated in the seas, recently (maybe less than 30 years), extrapolation from data collected during smaller events is needed to determine significant storm events, which is a source of uncertainty.…”

Section: Uncertainties In the Estimation Of Armor Weightmentioning

confidence: 99%

“…Table 2 shows the range of parameters affecting the armor weight on the western side of the rubble-mound breakwater in Noshahr port. The underlying distributions in this table were based on nature of the parameters and the results of the previous studies such as Johnson and Dock [22], Karimaei and Zarrati [23] and Muzzammil and Siddiqui [25]. It should be noted that when sufficient observed data or information of a particular random variable is available, the best underlying distribution can be established in several ways, such as conducting goodness-of-fit tests.…”

Section: Effective Parameters On Armor Weightmentioning

confidence: 99%

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Reliability-based design and sensitivity analysis of rock armors for rubble-mound breakwater

Tabarestani

Feizi

Bali³

2020

J Braz. Soc. Mech. Sci. Eng.

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Predicting the stability of armor blocks placed on breakwaters is one of the main challenges in coastal and ocean engineering. However, the armor layer's damage mechanism is very complicated so that there are many uncertainties in the estimation of different parameters in armor design. The inherent uncertainties in these parameters necessitate reliability analysis to ensure the stability of the breakwaters. This study proposed a reliability-based framework for estimating the rock armors weight based on the probabilistic analysis. The effect of different sources of uncertainties in determining effective parameters such as wave height, wave period, water-level changes and armor density was introduced and applied in calculating rock armors weight. Moreover, the correlations between breakwater life span, its probability of failure and stable armor weight were also considered in the analysis. Based on this method, armor weight could be computed according to any desired reliability level and breakwater life span. Results of sensitivity analysis showed that the most critical parameters affecting the reliability of armor weight are wave height and dimensionless damage level. Finally, the presented case study in this article addressed the use of this method in the design of armor weight for a breakwater constructed in the southern part of the Caspian Sea. Results showed that the stable armor weight to maintain a probability of failure equal to 0.005 placed on a breakwater with 50-year life span under a 100-year design storm condition in the Caspian Sea is about 24.28 ton. Moreover, by increasing the breakwater life span from 50 to 100 years, the armor weight increases only by about 10%.

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Section: Uncertainties In the Estimation Of Armor Weightmentioning

confidence: 99%

Section: Effective Parameters On Armor Weightmentioning

confidence: 99%

Reliability-based design and sensitivity analysis of rock armors for rubble-mound breakwater

Tabarestani

Feizi

Bali³

2020

J Braz. Soc. Mech. Sci. Eng.

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“…Many researchers showed that the stable bed protection stone's mean diameter can be determined using various equations. Isbash (1935) established a formula for stone movement, also some of the formulas connected the steady average protection material size to the average bed velocity (Mavis and Laushey, 1948;Peterka, 1958;Graf, 1971;Simons and Senturk, 1976;Saleh, 1995;Chiew, 2004;Tabarestani and Zarrati, 2019). The complete protection against scour is too expensive.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigations of stilling basin efficiency downstream radial gates – A case study of New Assuit Barrage, Egypt

Elberry,

Ali,

Abdelhaleem

et al. 2024

Journal of Water and Land Development

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Radial gates are more common than vertical sluice gates for a number of reasons. They are simpler to use, cause less flow disturbance, require less lifting force, and deliver better discharge. Radial gates are commonly used in new barrages, such as the New Assuit Barrage. Prior researchers used physical investigations to study the efficiency of stilling basin downstream radial gates, but physical studies cost a lot of money and time, so numerical solutions should be investigated. The current study aimed to explore numerically the influence of stilling basin shape and baffle block arrangement on the stability of bed protection, near-bed velocity, energy dissipation, and hydraulic jump characteristics downstream of radial gates. Different 12 discharges were investigated, and their results were compared with previous physical results to verify the performance of the numerical results. The results obtained from the numerical model from all trials are almost identical to the physical model results. Five different alternative designs were carried out numerically to enhance the design of the New Assuit Barrage (NAB) spillway stilling basin. Results showed that alternatives 4 (changing the geometry of the basin by removing the end step and concrete slab) and 5 (as alternative 4 in addition to adding rounded baffle blocks presented in two rows arranged in a staggered way) gave good velocity distribution with low turbulence, low values of near-bed velocities, and stability of bed protection. Also, it is more economical because of the lower cost of concrete and excavation.

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“…In the condition of an underlying water surface, these methods used for riverbanks are no longer applicable [2]. The stability evaluation of riprap adopts Monte Carlo simulation, inertia analysis, the Faroson blue point estimation method and others to calculate the riprap under the flow conditions [3,4]. Numerical simulation methods are usually used to simulate the changes in water flow, wind, waves and riverbed morphology caused by the implementation of stone dumping projects.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Riprap Movement Using the Continuous-Time Random Walking Method

Wang

Shu

Zhao

et al. 2021

Water

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During the implementation of the riprap project, the underwater migration process of the stones is quite uncertain because of its difficulty to observe. The process of stone transportation is discrete, which makes it unsuitable to be described by a continuous differential equation. Therefore, considering the distribution of stone jumping and waiting, a continuous-time random walk (CTRW) model is established. Based on the actual engineering data, five schemes simulate the one-dimensional motion of riprap underwater and further discuss the spatial distribution and particle size of the riprap. The results show that the CTRW model can effectively predict the riverbed elevation change behavior caused by the riprap project. The suitability of the model for the prediction of riprap movement decreases first and then increases with the increase in the selected width. This indicates that the randomness of the motion of the riprap causes the width of the observation zone to have a significant effect on the overall behavior of riprap movement. When the width is large enough, the influence of the randomness of the motion can be reduced by the average movement behavior within the observation zone. While the observation time of riprap movement is from a short to long time scale, the transport behavior changes from subdiffusion to normal diffusion behavior.

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Reliability analysis of riprap stability around bridge piers

Cited by 7 publications

References 22 publications

Reliability-based design and sensitivity analysis of rock armors for rubble-mound breakwater

Reliability-based design and sensitivity analysis of rock armors for rubble-mound breakwater

Numerical investigations of stilling basin efficiency downstream radial gates – A case study of New Assuit Barrage, Egypt

Simulation of the Riprap Movement Using the Continuous-Time Random Walking Method

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