Experimental investigation of the effect of vegetation on dam break flood waves

Oguzhan, Semire; Aksoy, Aysegul Ozgenc

doi:10.2478/johh-2020-0026

Cited by 16 publications

(8 citation statements)

References 18 publications

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“…The flow depth and velocity measurements presented and analyzed in the following sections are the averages of these three experiments. The so obtained results in the case of the existence of partial vegetation were compared to those obtained in the case of the absence of vegetation and also with the available experimental results obtained by Oguzhan and Aksoy [10] in the case of water depth of 98 cm. As shown in Figure 14, Oguzhan and Aksoy [10] realized their experiments on the distorted physical model of dense vegetation.…”

Section: Experimental Findingsmentioning

confidence: 78%

“…Guney et al [9], investigated experimentally the flood propagation due to partial dam break resulting from a trapezoid-shaped breach by using the distorted physical model of Urkmez Dam. The experimental results show that the Urkmez area can be flooded in a matter of minutes, at depths reaching up to 3 m. The flood wave front could reach the residential areas in 2 min and the sea coast in 4 m. Oguzhan and Aksoy [10], differently from this study presented here, investigated experimentally the effects of more dense vegetation on the flood wave propagation in the case of dam break by using the distorted physical model of Urkmez Dam. The dam break scenarios were achieved by means of rectangular and triangular gates for the dam reservoir levels 98 cm, 88 cm and 80 cm.…”

Section: Introductionmentioning

confidence: 75%

“…The influence of partial or dense vegetation on maximum flow velocities and elapsed times to reach maximum flow velocities (Tables 8 and 9) could not be determined since these values are not given in Oğuzhan and Aksoy [10] where only the point velocity along the UVP direction at the point 5.3 cm from the bottom is provided. When this component is compared it was found that this velocity component decreased more in the case of dense vegetation.…”

Section: Discussionmentioning

confidence: 99%

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Experimental Investigation of the Partial Vegetation Effect on the Flood Wave Propagation Resulted from Dam Failure in Urkmez Residential Area by means of Distorted Physical Model

Sevinç¹,

Güney²

2021

Deu Muhendislik Fakultesi Fen Ve Muhendislik

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The purpose of this study is to investigate the effect of partial vegetation on the wave propagation resulted from sudden dam failure in a residential area. Temporal variations of water depths and flood wave propagation velocities were determined and compared with those obtained from the experiments performed without vegetation. The experiments were performed on the distorted physical model of Urkmez Dam and its downstream region. The distorted physical model with horizontal scale of 1/150 and vertical scale of 1/30 contains the dam reservoir, the dam body, the residential area of Urkmez coastal town until the sea and the partial vegetation. In the model, the reservoir has an active volume of 11.222 m 3 , the dam body has a length of 2.84 m and a height of 1.07 m, and the downstream area is nearly 200 m 2 . Water depths were measured by e+ WATER L level sensors placed at various locations of the downstream region. Velocities were measured by ultrasonic velocity profilers (UVP) located near the level sensors. Flood wave propagation was recorded by the high definition digital camera. Experimental findings obtained from the physical model were converted to the prototype values, in nature. The changes in water depths and elapsed times, also the changes in velocities and their occurrence times were determined for different zones of the downstream area in the presence of vegetation. The experimental results revealed that in such a dam failure, the flood arrives at the sea in 6 s in the absence of vegetation, while in 10 s in the presence of vegetation. These values correspond to 2.74 min and 4.57 min, respectively in the prototype. The existence of vegetation resulted in decrease in flood propagation velocities mainly in the dense residential area, as expected. It was observed that the maximum water depths were increased at the left bank and decreased at the right bank, except at level sensor S6 which is very close to the creek. It was observed that the maximum depth averaged velocities were decreased in the sparse and dense residential areas. The existence of the vegetation changed considerably the local velocities during

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Section: Experimental Findingsmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 75%

Section: Discussionmentioning

confidence: 99%

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Experimental Investigation of the Partial Vegetation Effect on the Flood Wave Propagation Resulted from Dam Failure in Urkmez Residential Area by means of Distorted Physical Model

Sevinç¹,

Güney²

2021

Deu Muhendislik Fakultesi Fen Ve Muhendislik

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“…In densely populated areas, a flood due to a dam rupture can cause a devastating disaster with loss of life and property. The time required to warn people living below the reservoir is very short in the event of a flood caused by a dam rupture (Oguzhan, and Aksoy, 2020;Xu et al, 2012). May 2021 was extremely cold and very wet in Slovakia.…”

Section: Introductionmentioning

confidence: 99%

Post-flood analysis of the flood from the rupture of the stone dam in Rudno nad Hronom on May 17, 2021

Pekárová¹,

Miklánek²,

Pekár³

et al. 2022

AHS

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The study is aimed at reconstructing the course of the flood from May 17, 2021 breach of the stone dam in Rudno nad Hronom. Firstly, the volume of water in the reservoir before its breach was determined. The reservoir storage volume was estimated to be 14 807 m 3 . Then, we focused on the analysis of the hydrological regime in the wider Rudniansky Brook region. In order to derive the flood wave course from the rainfall, a series of 15-minute discharge from neighbouring water gauges measured by the Slovak Hydrometeorological Institute were analysed. In analysing the long-term trends of precipitation and temperature series we used data from the Banská Štiavnica meteorological station (period 1901-2020). In the second part, based on several field measurements after the flood event, we estimated the peak flows of floods from May 17, 2021 above the reservoir and under the reservoir. One hundred meters above the reservoir culmination reached 7.8 m 3 s -1 , under the reservoir it was between 80 to 100 m 3 s -1 . Finally, we reconstructed the course of the flood wave from the precipitation above the reservoir by hydrological analogy and by simple rainfall-runoff hydrological model NLC. The course of the breakthrough wave from the reservoir water just below the dam was determined to be triangular in shape so that the peak reached 90 m 3 s -1 and the volume was 15,000 m 3 .

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“…The Physical models should be used as supplement and calibration of Numerical models [12]. Some studies found that the vegetation and dam break shape play an important role in dam break flood wave [13]. Rock-fill dam break flood analysis is a very important basic work in early warning and emergency rescue work, and the accuracy of dam breach flood prediction can directly affect the formulation and implementation of emergency treatment plans; among them, the prediction of dam break durations is a prerequisite for risk assessment and emergency response [14].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis of Rock-Fill Dam Break Flood on Different Dam Break Durations

Chang-wen¹,

Gao²,

Xu³

et al. 2021

OJSST

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The dam break pattern of rock-fill dams is normally gradual failure. This kind of dam failure is caused by seepage piping or overtopping, in which dam crest overflow is more common. The dam breach expansion process shall depend comprehensively on the structure pattern, material property of dam, and damsite cross sectional topography. And the break duration has a significant impact on the magnitude of break flood and the counter-measures for excess-standard flood. Take the Karot Hydropower Project constructed on the Jhelum River in Pakistan as an example, the dam break mathematical model is set up to analyze the sensitivity of damsite discharge process, downstream highest flood water surface profile and flood peak appearance time to dam break duration. The results show that: with the increase of dam break duration, damsite peak discharge is decreased sharply, flood peak appearance time extends, on-way highest water levels below Karot dam are lowered significantly, and some settlement places below Karot dam can avoid being inundated until the break duration reaches a critical value. If encountering probable maximum flood, the dam break occurs when the reservoir water level reaches dam top EL, some measures can be taken to extend the break duration, so as to effectively reduce the loss of downstream flood. The research results will help to understand the relationship mechanism between rock-fill dam break flood and break duration and provide a scientific basis or some solutions for optimization design of dam and counter-measures of dam break flood.

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Experimental investigation of the effect of vegetation on dam break flood waves

Cited by 16 publications

References 18 publications

Experimental Investigation of the Partial Vegetation Effect on the Flood Wave Propagation Resulted from Dam Failure in Urkmez Residential Area by means of Distorted Physical Model

Experimental Investigation of the Partial Vegetation Effect on the Flood Wave Propagation Resulted from Dam Failure in Urkmez Residential Area by means of Distorted Physical Model

Post-flood analysis of the flood from the rupture of the stone dam in Rudno nad Hronom on May 17, 2021

Sensitivity Analysis of Rock-Fill Dam Break Flood on Different Dam Break Durations

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