Comparison of specific sediment transport rates obtained from empirical formulae and dam breaching experiments

Alhasan, Zakaraya; Jandora, Jan; Říha, Jaromír

doi:10.1007/s10652-016-9463-2

Cited by 15 publications

(9 citation statements)

References 24 publications

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“…During the erosion, the bottom of the breach opening remains horizontal and the sides remain approximately vertical (Figure ). Water flow along the landside slope is approximated by quasi‐steady uniform flow (Fread, ; Singh, ; Wahl, ). This was also confirmed by Alhasan, Jandora, and Říha (). This condition is not fulfilled close to the dike crest, where the flow depth is underestimated.…”

Section: Conceptual Approachsupporting

confidence: 78%

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Influence of surface lining type on the probability of dike breaching due to overtopping

Alhasan

Duchan

Říha

2019

J Flood Risk Management

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The reliability analysis of a flood protection dike depends on the probability of its failure. In this context, the surface lining covering the landside slope of the dike plays a considerable role, as it protects the dike against failure due to overtopping. A mathematical model describing the overtopping and erosion processes is proposed. The overtopping is simulated using simple surface hydraulics equations while the erosion initiation is linked to the lining resistance. For the modelling of erosion, a simple transport equation was used with erosion parameters. In order to obtain a probabilistic solution, the uncertainty in the involved parameters was taken into account and the Latin Hypercube Sampling method was used. Eight different types of lining material were tested for a chosen dike. Typical phases of the dike breaching due to overtopping were distinguished. The final results take the form of probabilities for those typical phases for each lining material.

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Section: Conceptual Approachsupporting

confidence: 78%

“…• Water flow along the landside slope is approximated by quasisteady uniform flow (Fread, 1988;Singh, 1996;Wahl, 1998). This was also confirmed by Alhasan, Jandora, and Říha (2016). This condition is not fulfilled close to the dike crest, where the flow depth is underestimated.…”

Section: Resistance Phase (Overtopping-no Erosion) a Dikementioning

confidence: 52%

Influence of surface lining type on the probability of dike breaching due to overtopping

Alhasan

Duchan

Říha

2019

J Flood Risk Management

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“…A recent experimental study was performed by Alhasan et al [61], in which results of laboratory tests on dam breaching are compared with sediment transport rates predicted using state-of-the-art formulae. The average ratios between computed and experimentally measured specific sediment loads are comprised between 4.9 and 24.8, depending on the formula adopted.…”

Section: Resultsmentioning

confidence: 99%

Investigating the Sediment Yield Predictability in Some Italian Rivers by Means of Hydro-Geomorphometric Variables

et al. 2018

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In the present work, preliminary results are reported from an ongoing research study aimed at developing an improved prediction model to estimate the sediment yield in Italian ungauged river basins. The statistical correlations between a set of hydro-geomorphometric parameters and suspended sediment yield (SSY) data from 30 Italian rivers were investigated. The main question is whether such variables are helpful to explain the behavior of fluvial systems in the sediment delivery process. To this aim, a broad set of variables, simply derived from digital cartographic sources and available data records, was utilized in order to take into account all the possible features and processes having some influence on sediment production and conveyance. A stepwise regression analysis pointed out that, among all possibilities, the catchment elevation range (H r ), the density of stream hierarchical anomaly (D a ), and the stream channel slope ratio (∆S s ) are significantly linked to the SSY. The derived linear regression model equation was proven to be satisfactory (r 2 -adjusted = 0.72; F-significance = 5.7 × 10 −8 ; ME = 0.61), however, the percentage standard error (40%) implies that the model is still affected by some uncertainties. These can be justified, on one hand, by the wide variance and, on the other hand, by the quality of the observed SSY data. Reducing these uncertainties will be the effort in the follow-up of the research.

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“…The inflow is regulated by a screening device before flowing into the flume channel to enable stable flow conditions. The design of the water supply setup is similar to that of Alhasan et al (2016) [41] in that the water was stilled/regulated before entering the flume channel. Dimensions of the dam model are listed in Table 1.…”

Section: Test Configurationmentioning

confidence: 99%

On Dam Failure Induced Seismic Signals Using Laboratory Tests and on Breach Morphology due to Overtopping by Modeling

Hung

Tseng

Chen

et al. 2021

Water

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Dam models were constructed in an indoor flume to test dam breach failure processes to study the seismic signals induced. A simple dam breach model was also proposed to estimate hydrographs for dam breach floods. The test results showed that when the retrogressive erosion due to seepage of the dam continues, it will eventually reach the crest at the upstream side of the dam, and then trigger overtopping and breaching. The seismic signals corresponding to the failure events during retrogressive erosion and overtopping of the dam models were evaluated. Characteristics of the seismic signals were analyzed by Hilbert–Huang transform. Based on the characteristics of the seismic signals, we found four types of mass movement during the retrogressive erosion process, i.e., the single, intermittent, and successive slides and fall. There were precursor seismic signals found caused by cracking immediately before the sliding events of the dam. Furthermore, the dam breach modeling results coincided well with the test results and the field observations. From the test and modeling results, we confirmed that the overtopping discharge and the lateral sliding masses of the dam are also among the important factors influencing the evolution of the breach. In addition, the widening rate of the breach decreases with decreased discharge. The proposed dam breach model can be a useful tool for dam breach warning and hazard reduction.

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Comparison of specific sediment transport rates obtained from empirical formulae and dam breaching experiments

Cited by 15 publications

References 24 publications

Influence of surface lining type on the probability of dike breaching due to overtopping

Influence of surface lining type on the probability of dike breaching due to overtopping

Investigating the Sediment Yield Predictability in Some Italian Rivers by Means of Hydro-Geomorphometric Variables

On Dam Failure Induced Seismic Signals Using Laboratory Tests and on Breach Morphology due to Overtopping by Modeling

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