Identifying the effects of parameter uncertainty on the reliability of modeling the stability of overhanging, multi-layered, river banks

Samadi, A.; Amiri-Tokaldany, E.; Davoudi, M H; Darby, Stephen E.

doi:10.1016/j.geomorph.2011.08.004

Cited by 23 publications

(22 citation statements)

References 45 publications

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“…After that, cantilever failure occurred along the tension crack line. The dominant failure mechanism was observed to be beam failure, which is consistent with the findings of previous researchers who have suggested that beam failure may be prevalent (e.g., Darby et al, 2007;Samadi et al, 2011Samadi et al, , 2013Thorne and Tovey, 1981). Moreover, the results indicate that cohesive riverbanks with higher silt-clay contents are more susceptible to failure than those with lower silt-clay contents.…”

Section: Discussionsupporting

confidence: 90%

“…The results indicate that the overhanging block height and cohesive force have a significant impact on the overhanging block stability (Samadi et al, 2011). For example, the experimental results show that the total experiment time for a higher bank (20 cm in case 2) was longer than that of a lower bank (15 cm in case 3).…”

Section: Discussionmentioning

confidence: 93%

“…In addition, shear and beam failure mechanisms were studied to identify the significant effects of uncertainty parameters on the reliability of a bank stability model in determining a cantilever failure. The results showed that the overhanging block dimensions and the cohesive force are highly significant for an analysis of cantilever stability (Samadi et al, 2011). A stress-strain behaviour model for a cantilever failure was also applied to simulate the subsequent failure of an overhanging block (Samadi et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cantilever failure investigations for cohesive riverbanks

Patsinghasanee¹,

Kimura²,

Shimizu³

et al. 2017

Proceedings of the Institution of Civil Engineers - Water Manag

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cantilever failure investigations for cohesive riverbanks

Patsinghasanee¹,

Kimura²,

Shimizu³

et al. 2017

Proceedings of the Institution of Civil Engineers - Water Manag

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“…The Gaussian distribution was selected in analogy to the work by Güneralp and Rhoads [2011], who assumed, as first approximation, a Gaussian distribution of the migration coefficient E 0 . Furthermore, studies on the natural variability of geotechnical parameters at bend scale [ Parker et al , 2008] and reach scale [ Samadi et al , 2011] have shown that Gaussian fits of parameter distributions are statistically significant. In particular, Parker et al [2008]demonstrated, using the D'Agostino‐Pearson statistical test for normality, that sampling variability may be in general the only factor responsible for any deviations from a Gaussian distribution for cohesion, friction angle, and saturated unit weight; Samadi et al [2011]observed that values of coefficient of determination of data‐fitted Gaussian probability density function curves for cohesion and matric suction angle are close to unity.…”

Section: Representation Of Floodplain Soilsmentioning

confidence: 99%

“…Two different spatial distributions for floodplain heterogeneity are used. Simulations are performed using a Monte Carlo probabilistic method to evaluate how the variability in erodibility parameters affects meandering river migration at the reach scale, analogously to the approach followed, at the local scale, by Parker et al [2008] and Samadi et al [2011]for the computation of the factor of safety for planar and cantilever failure, respectively. This work identifies to what extent meander migration is affected by floodplain heterogeneity, the parameters that govern this effect, and how their variability affects migrated‐centerline variability.…”

Section: Introductionmentioning

confidence: 99%

The effects of floodplain soil heterogeneity on meander planform shape

Motta

Abad

Langendoen

et al. 2012

Water Resources Research

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[1] Past analytical studies of meander planform development have mostly focused on the complexity of the governing equations, i.e., hydrodynamics, and less so on the stream bank resistance to erosion, whose spatial heterogeneity is difficult to describe deterministically. This motivated the use of a Monte Carlo approach to examine the effects of floodplain soils and their distribution on planform development, with the goal of including bank erosion properties in the analysis. Simulated bank erosion rates are controlled by the resistance to hydraulic erosion of the bank soils using an excess shear stress approach. The spatial distribution of critical shear stress across the floodplain is delineated on a rectangular, equidistant grid with varying degrees of variability. The corresponding erodibility coefficient is computed using a field-derived empirical relation. For a randomly disturbed distribution, in which the mean resistance to erosion exponentially increases away from the valley centerline, two relevant parameters are identified: the standard deviation of the critical shear stress distribution, which controls skewness and variability of the channel centerline, and the cross-valley increase in soil resistance, which constrains lateral migration and also affects bend skewness. For a purely random distribution, migrated centerlines exhibit larger variability for increasing spatial scales of floodplain soil heterogeneity. For equal stochastic variability of the corresponding governing parameters, relating meander migration to hydraulic erosion of the bank soils produces more variability and shape complexity than the "classic" bank migration approach of Ikeda et al. (1981), which relates migration rate to excess velocity at the outer bank. Finally, the proposed stochastic approach provides a foundation for estimating a suitable spatial density of measurements to characterize the physical properties of floodplain soils and vegetation.

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Models in Fluvial Geomorphology

Wiel

Rousseau

Darby

2003

Tools in Fluvial Geomorphology

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2D channel morphology, 115-117 recent applications, 116 2D mapping of flood inundation, 120-121 2D mapping of floodplain morphology, 119-120 2D mapping of overbank sedimentation, deposition and scour, 121-122 3D channel morphology, 117-119 3D mapping of floodplain morphology, 119-120 3D mapping of overbank sedimentation, deposition and scour, 121-122 A a priori hypothesis, 6 accelerator mass spectrometry (AMS), 19-20 acoustic Doppler current profilers (ADCPs) for sediment transport, 329 accuracy, 274 accuracy of data sources cartographic record, 61 assessing accuracy, 66 attribute accuracy, 65-66 positional accuracy, 61-62 temporal accuracy, 66 documentary record, 61-63 modern historical record, 71 acoustic back-scattering (ABS) sensors, 329-330 acoustic Doppler current profilers (ADCPs) discharge measurement, 266-267 flow velocity measurement, 264-265 sediment transport, 329 acoustic Doppler velocitometers (ADVs) for flow velocity measurement, 263-4, 458 acoustic sensors, 329 active transformation, 43 advection-diffusion equation, 421 adventitious sprouts, 217-218 aerial photography analysis, 103, 122 advantages and disadvantages, 110, 123, 125, 126, 127 floodplain geomorphology and fluvial processes 2D and 3D mapping of floodplain morphology, 119-120 2D and 3D mapping of overbank sedimentation, deposition and scour, 121-122 2D mapping of flood inundation, 120-121 physical basis considerations, 110 electromagnetic radiation (EMR), 108-109 geometric accuracy, 112 image format, 111 overview, 115 photogrammetry, 103-108 scale and spatial accuracy issues, 110-112 sensor resolution, 111-112 sensors and platforms, 109-110 Tools in Fluvial Geomorphology, Second Edition. Edited by G. Mathias Kondolf and Hervé Piégay.

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Identifying the effects of parameter uncertainty on the reliability of modeling the stability of overhanging, multi-layered, river banks

Cited by 23 publications

References 45 publications

Cantilever failure investigations for cohesive riverbanks

Cantilever failure investigations for cohesive riverbanks

The effects of floodplain soil heterogeneity on meander planform shape

Models in Fluvial Geomorphology

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