Probabilistic failure analysis of riprap as riverbank protection under flood uncertainties

Jafarnejad, Mona; Pfister, Michael; Brühwiler, Eugen; Schleiss, Anton

doi:10.1007/s00477-016-1368-6

Cited by 10 publications

(4 citation statements)

References 21 publications

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“…In the condition of an underlying water surface, these methods used for riverbanks are no longer applicable [2].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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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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“…Since then, numerous concepts for the design of sea defence structures, i. e. dikes, dunes and breakwaters, have been published, i. e. [4][5][6][7][8][9]. Approximately ten years ago, first studies of the hydraulic [10] and geotechnical stability [11,12] of river and canal embankments were published, which focus on flood events and natural flow. So far, revetment stability under ship-induced loads has not been addressed.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Parameter Uncertainties Inherent to the Geotechnical Design of Bank Revetments at Inland Waterways

Sorgatz

Kayser

2021

Lecture Notes in Civil Engineering

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This paper describes the effects of uncertainty inherent to the choice of hydraulic load and soil parameters on the geotechnical revetment design. As for the practitioner, the effect of uncertainties on the required armour layer thickness is studied. Uncertainties inherent to revetment design mainly result from the load and resistance parameters employed in the design. At present, design loads are obtained from empirical equations and worst-case 'design vessel passages'. Characteristic soil parameters are defined on the basis of a limited number of field and laboratory tests. Thus, uncertainties arise with regard to the choice of characteristic values. In order to investigate the effects of parameter uncertainty on the revetment design, distributions and correlations of loads are assessed using vessel passages observed in the field. In ensuing uncertainty analyses it is found that at present available data does not allow approximating loads by means of probability functions, whereas for the soil parameters the results indicate that the minima of the soil parameters govern the design. However, it is also found that when considering more than one soil parameter as random variable, a less conservative design can be achieved as with the individual minima. As a conclusion, recommendations regarding parameter choice and design procedure are provided.

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“…Hence, the stability of the riverbanks is greatly affected by the interaction of water within the soil system. According to Jafarnejad et al (2017), changing atmospheric conditions due to climate change may alter the rate and distribution of precipitation. Such incident influences the time of occurrence, frequency, and magnitude of extreme flood events, which make existing riverbank slope protection structures and flood protection measures like ripraps vulnerable to the risk of failure considering the possible changes in flood regime.…”

Section: Introductionmentioning

confidence: 99%

Large-Scale Prototype Testing of a Composite Geosynthetics Reinforced Earth Structure for Riverbank Slope Protection Using Fine Grained Sandy Soil

Circulado,

Lorenzo

2020

MJST

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This paper presents the field evaluation of large scale prototypes of an innovative composite geosynthetic reinforced earth (CGRE) structure as an alternative for the conventional earth retaining structures, hence a green engineering design for riverbank slope protection. This reinforced earth structure comprises of a geogrid that serves as the main reinforcement and the cover of the facing member of the structure; and a geotextile as separator medium between the infill soil and intermediate horizontal gravel drainage. Three large scale prototypes at full, half, and no gravel drainage were built, monitored, and tested. Clayey sand soil was the fill material used and a 3/2” to 2” sub-rounded gravel was used for the drainage and facing members. CGRE prototypes were evaluated in saturated conditions, and tested under incremental surcharge loadings with a total applied stress of 40 kPa. Lateral displacements for every layer of the structure were determined using horizontal rods where readings were taken from line gauges. Results showed that prototypes with gravel drainage displaced lower than the permissible limit of 4.0%. The CGRE prototype with full gravel drainage had the smallest average total lateral displacement of 1.28%. Hence, it had a higher interface friction resistance, and pull-out capacity than the one with less or no gravel drainage. Overall, the incorporation of gravel drainage improved the performance of the reinforced earth system by reducing the lateral movements of the structure. Therefore, the CGRE structure is a viable slope protection alternative even under saturated conditions.

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Probabilistic failure analysis of riprap as riverbank protection under flood uncertainties

Cited by 10 publications

References 21 publications

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

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

Investigation of Parameter Uncertainties Inherent to the Geotechnical Design of Bank Revetments at Inland Waterways

Large-Scale Prototype Testing of a Composite Geosynthetics Reinforced Earth Structure for Riverbank Slope Protection Using Fine Grained Sandy Soil

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