Breach Discharge Estimates and Surface Velocity Measurements for an Earth Dam Failure Process Due to Overtopping Based on the LS-PIV Method

2018 ◽  
Vol 44 (1) ◽  
pp. 329-339 ◽  
Author(s):  
Jie Liu ◽  
Xing Chuan Zhou ◽  
Wei Chen ◽  
Xiao Hong
Keyword(s):  
Failure Process ◽  
Surface Velocity ◽  
Earth Dam ◽  
Dam Failure ◽  
Velocity Measurements ◽  
Piv Method

Sensitivity Analysis of Dam Breach Parameters for Variation Capacity Earthen Dams

2021 ◽  
Vol 18 (3) ◽  
pp. 1-9
Author(s):  
Chau Kim Tran
Keyword(s):  
Sensitivity Analysis ◽  
Development Time ◽  
Failure Process ◽  
Parameter Analysis ◽  
Earth Dam ◽  
Dam Failure ◽  
Fast Method ◽  
Input Variables ◽  
Rising Time ◽  
Breach Width

Sensitivity analysis is an effective tool to determine the robustness of an assessment by examining the extent to which the results are affected by changes in input. In this study, the FAST method was applied to analyse the sensitivity to the earth dam failure process. Four (04) input variables were selected including breach development time, breach width, side slope, and initial breach position. The effects of these parameters on the two (02) outputs i.e., the maximum outflow, and rising time were assessed. The study was applied to 08 reservoirs with different capacities. The sensitivity analysis showed that the development time and initial breach location dominantly affect these outputs. Additionally, development time is the most important factor in rising time. The lateral slope has an insignificant effect on outputs. The effect of breach width can be neglected to rising time, however, its influence on maximum outflow is significant. The results of this study show the role of input variables in the flow hydrograph due to dam failure. Through this research, the workload of the breach parameter analysis process can be substantially reduced.

scholarly journals Failure of Zoned Earth Dam (An analysis of earth dam break)

2019 ◽  
Vol 27 (1) ◽  
pp. 344-353
Author(s):  
Abdul-Hassan K. Al-Shukur ◽  
Ranya Badea’ Mahmoud
Keyword(s):  
Water Level ◽  
Factor Of Safety ◽  
Limit Equilibrium ◽  
Water Flux ◽  
Dam Break ◽  
The Body ◽  
Earth Dam ◽  
Dam Failure ◽  
Maximum Water Level ◽  
Maximum Water

One of the most common type of embankment dam failure is the dam-break due to overtopping. In this study, the finite elements method has been used to analyze seepage and limit equilibrium method to study stability of the body of an earthfill dam during the flood condition. For this purpose, the software Geostudio 2012 is used through its subprograms SEEP/W and SLOPE/W. Al-Adhaim dam in Iraq has been chosen to analysis the 5 days of flood. It was found that the water flux of seepage during the flood reaches about 8.772*10-5. m3/sec when the water level 146.5 m at 2nd day. Seepage through the embankment at maximum water level increased by 55.1 % from maximum water level. It was concluded that the factor of safety against sliding in downstream side decrease with increasing water level and vice versa. It was also concluded that the deposits are getting more critical stability during the conditions of flood when the factor of safety value reaches 1.219 at 2nd day.

Position Registration of Scanning Lasers for Experimental Spatial Dynamics Modeling

1994 ◽  
Author(s):  
David E. Montgomery ◽  
Robert L. West
Keyword(s):  
Spatial Dynamics ◽  
Spatial Models ◽  
Laser Doppler Vibrometer ◽  
Sample Surface ◽  
Surface Shape ◽  
Surface Velocity ◽  
Multiple Point ◽  
Range Data ◽  
Dynamics Modeling ◽  
Velocity Measurements

Abstract Experimental spatial dynamics modeling involves using scanning lasers to sample surface shape and dynamic response of structures in order to verify structural dynamics design intent. Formation of accurate spatial models from laser-based measurements requires that laser position and orientation be registered relative to a fixed coordinate system. A three point direct registration procedure is defined for shape modeling using laser range and mirror deflection angles. Surface velocity measurements with a portable laser Doppler vibrometer (LDV) also require registration, but range information is unavailable. A multiple point indirect registration algorithm for the LDV is described that involves minimizing three nonlinear equations. A simulated laser rangefinder (LRF) was developed for demonstrating three point direct registration. The 3-D geometry of a compressor housing was modeled by combining range data from multiple laser positions. The multiple point indirect registration was applied to 3-D velocity response field reconstruction of a composite plate from velocity measurements scanned at three separate positions.

Spill alert device for earth dam failure warning

1984 ◽  
Vol 9 (3) ◽  
pp. 373-380
Author(s):  
Robert M. Koerner ◽  
Arthur E. Lord
Keyword(s):  
Earth Dam ◽  
Dam Failure

scholarly journals Application of Effective Stress Model to Analysis of Liquefaction and Seismic Performance of an Earth Dam in China

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Changqing Qi ◽  
Wei Lu ◽  
Jimin Wu ◽  
Xing Liu
Keyword(s):  
Pore Pressure ◽  
Seismic Performance ◽  
Effective Stress ◽  
Earth Dam ◽  
Dam Failure ◽  
Excess Pore Pressure ◽  
Stress Model ◽  
Gravelly Soil ◽  
Excess Pore

Earthquake-induced liquefaction is one of the major causes of catastrophic earth dam failure. In order to assess the liquefaction potential and analyze the seismic performance of an earth dam in Fujian, Southeastern China, the in situ shear wave velocity test was firstly carried out. Results indicate that the gravelly filling is a type of liquefiable soil at present seismic setting. Then the effective stress model was adopted to thoroughly simulate the response of the soil to a proposed earthquake. Numerical result generally coincides with that of the empirical judgment based on in situ test. Negative excess pore pressure developed in the upper part of the saturated gravelly filling and positive excess pore pressure developed in the lower part. The excess pore pressure ratio increases with depth until it reaches a maximum value of 0.45. The displacement of the saturated gravelly soil is relatively small and tolerable. Results show that the saturated gravelly filling cannot reach a fully liquefied state. The dam is overall stable under the proposed earthquake.

Terrain analyses and surface velocity measurements of the Hiorthfjellet rock glacier, Svalbard

2003 ◽  
Vol 14 (4) ◽  
pp. 359-365 ◽  
Author(s):  
Rune S. Ødegård ◽  
Ketil Isaksen ◽  
Trond Eiken ◽  
Johan Ludvig Sollid
Keyword(s):  
Surface Velocity ◽  
Velocity Measurements ◽  
Rock Glacier

Rupture du barrage du lac Beloeil: causes et conséquences

1995 ◽  
Vol 22 (3) ◽  
pp. 506-513 ◽  
Author(s):  
Bruno Robert ◽  
Jean-Jacques Paré
Keyword(s):  
Human Life ◽  
Internal Erosion ◽  
Earth Dam ◽  
Dam Failure ◽  
Surveillance Program ◽  
Dam Foundation ◽  
Environmental Consequences ◽  
Small Water ◽  
History Of ◽  
Foundation Failure

The foundation failure of a small earth dam, 4.1 m in height, has created a large breach through the overburden foundation, down to the bedrock, and has produced the complete loss of the Beloeil Lake reservoir. The geological nature of the dam foundation was complex; its resistance to internal erosion has changed with time due to seepage forces. The design of the dam foundation treatment was marginal. In this paper, the conditions of the dam prior to failure are given, the probable causes of the accident are presented, and the environmental consequences are reported. Such a case history of a dam failure illustrates the necessity to have a thorough knowledge of the foundation conditions of existing dams even for a very small water retaining structure. That accident demonstrates also the need for a continuous and effective surveillance program. Damages consist mainly in overburden erosion and sediment transportation through a remote area without any loss of human life. Key words: earth dam, foundation, failure, environment, rehabilitation, dam safety, surveillance.

Une modélisation théorique nouvelle de la rupture par submersion d'une digue en terre et sa validation

2004 ◽  
Vol 31 (5) ◽  
pp. 797-812 ◽  
Author(s):  
N E Zerrouk ◽  
C Marche
Keyword(s):  
Numerical Model ◽  
Formation Process ◽  
Earth Dam ◽  
Dam Failure ◽  
Second Step ◽  
Dam Breach ◽  
Erosion Mechanism ◽  
Flow Hydraulics ◽  
Earth Fill

This paper presents the EROBAR numerical model on breach formation in earth-fill dams during an overtopping flow. Hydraulics of flow over an earth-fill dam is considered as the basis for the comprehension of the breach formation process. To this will be added the mastery of the erosion mechanism and of widening of the breach canal. As the breach formation process in an earth-fill dam is very complex, the EROBAR model was the object of a two-step formulation, with the two steps joined later. The first step deals with the flow hydraulics, vertical erosion, and longitudinal evolution of the profile of the dam. The second step introduces the widening of the breach, based on the instability of the breach slope. After the two formulations were joined and validated, the EROBAR model was applied to the experimental dyke, to several homogenous earth-fill dams with or without protection, and to zoned dams.Key words: dam failure, breach erosion, earth-fill dam breach, overtopped earth dam, numerical model.

scholarly journals STRUCTURES OF TURBULENT VORTICES AND THEIR INFLUFENCE ON FLOW PROPERTIES

2015 ◽  
Vol 1 (1) ◽  
pp. 14-24
Author(s):  
Alfonsas Rimkus
Keyword(s):  
Turbulent Flows ◽  
Additional Data ◽  
Particle Image ◽  
Short Interval ◽  
Measurement Data ◽  
Velocity Measurements ◽  
Flow Properties ◽  
Piv Method ◽  
The Many ◽  
Detailed Picture

In spite of the many investigations that have been conducted on turbulent flows, the generation and development of turbulent vortices has not been investigated sufficiently yet. This prevents to understand well the processes involved in the flow. That is unfavorable for the further investigations. The developing vortex structures are interacting, and this needs to be estimated. Physical summing of velocities, formed by all structures, can be unfavorable for investigations, therefore they must be separated; otherwise bias errors can occur. The difficulty for investigations is that the widely employed Particle Image Velocity (PIV) method, when a detailed picture of velocity field picture is necessary, can provide photos covering only a short interval of flow, which can’t include the largest flow structures, i.e. macro whirlpools. Consequently, action of these structures could not be investigated. Therefore, in this study it is tried to obtain the necessary data about the flow structure by analyzing the instantaneous velocity measurements by 3D means, which lasts for several minutes, therefore the existence and interaction of these structures become visible in measurement data. The investigations conducted in this way have been already discussed in the article, published earlier. Mostly the generation and development of bottom vortices was analyzed. In this article, the analysis of these turbulent velocity measurements is continued and the additional data about the structure of turbulent vortices is obtained.

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