3D Visual Simulation of Dam-Break Process at the Dam Breach

2012 ◽  
Author(s):  
Weiping Guo ◽  
Wenqian Li ◽  
Xuefei Ao ◽  
Xiaoling Wang
Keyword(s):  
Dam Break ◽  
Visual Simulation ◽  
Dam Breach ◽  
Break Process

scholarly journals Experimental Research on the Dam-Break Mechanisms of the Jiadanwan Landslide Dam Triggered by the Wenchuan Earthquake in China

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Fu-gang Xu ◽  
Xing-guo Yang ◽  
Jia-wen Zhou ◽  
Ming-hui Hao
Keyword(s):  
Wenchuan Earthquake ◽  
Discharge Channel ◽  
Landslide Dam ◽  
Dam Break ◽  
Experimental Results ◽  
Dam Breaks ◽  
The Wenchuan Earthquake ◽  
Large Numbers ◽  
Dam Management ◽  
Break Process

Dam breaks of landslide dams are always accompanied by large numbers of casualties, a large loss of property, and negative influences on the downstream ecology and environment. This study uses the Jiadanwan landslide dam, created by the Wenchuan earthquake, as a case study example. Several laboratory experiments are carried out to analyse the dam-break mechanism of the landslide dam. The different factors that impact the dam-break process include upstream flow, the boulder effect, dam size, and channel discharge. The development of the discharge channel and the failure of the landslide dam are monitored by digital video and still cameras. Experimental results show that the upstream inflow and the dam size are the main factors that impact the dam-break process. An excavated discharge channel, especially a trapezoidal discharge channel, has a positive effect on reducing peak flow. The depth of the discharge channel also has a significant impact on the dam-break process. The experimental results are significant for landslide dam management and flood disaster prevention and mitigation.

Predict Research for Loss of Life Due to Dam Breach for Guangxi Luocheng Kama Reservoir

2011 ◽  
Vol 243-249 ◽  
pp. 3877-3882
Author(s):  
Rong Yong Ma ◽  
Xiang Chen ◽  
Lei Lei Yang ◽  
Xiao Qing Zhang
Keyword(s):  
Calculation Result ◽  
Dam Break ◽  
Dam Failure ◽  
Suitable Model ◽  
Actual Situation ◽  
Dam Breach ◽  
Loss Of Life ◽  
At Home

In this paper，the basic situation of Guangxi luocheng Kama reservoir and the potential dangers are introduced firstly, and then，different models often used to estimate the loss of life in dam failure at home and abroad are introduced and analysed.Based on the above, a suitable model for national actual situation is chosen to predict the loss due to this reservoir dam breach，and the severity according to the calculation result of assuming Kama reservoir dam-break is assessed. Finally, the relevant departments’s measures of rescuing and evacuating downstream masses etc. at danger in 2009 are proved to be correct，necessary and timely.

Aspects aléatoires de l'érosion d'une digue : simulations de la brèche par des algorithmes génétiques

2004 ◽  
Vol 31 (6) ◽  
pp. 927-942 ◽  
Author(s):  
Ousmane Seidou ◽  
Claude Marche ◽  
Tewfik Mahdi
Keyword(s):  
Field Data ◽  
Energy Dissipation Rate ◽  
Dam Break ◽  
Random Component ◽  
Dam Breach ◽  
Geotechnical Parameters ◽  
Uncertainty Sources ◽  
Hydraulic Conditions ◽  
Dam Break Flow ◽  
Flow Evolution

Attempts to forecast the final form of a dam-break suffer from various uncertainty sources such as field data (topography, hydraulic and geotechnical parameters), and modeling assumptions. So the result seems to be at least partially chaotic and difficult to match with the objectives of the dam-safety engineers in which the goal is to model dam-break flow evolution in time. On the other hand, the principle of minimal energy dissipation rate makes it possible to predict the shape towards which the geometry of the breach will evolve to under stationary hydraulic conditions. In this article, one uses energy minimization by a genetic algorithm to integrate at the same time the two concepts of random result and convergence towards an equilibrium state. They are used to simulate the submersion failure of a clay dam, and the results agree reasonably with the field data. This approach makes it possible to obtain as realistic breach shapes as those obtained by actual models, and to introduce a random component in the process of dam-breach formation, which remains, however, guided by a physical principle.Key words: erosion, dam breach, genetic algorithms, sediment transport.

EXPERIMENTAL STUDY OF BREACH GROWTH PROCESSES IN SAND DAMS OF QUAKE LAKES

2011 ◽  
Vol 05 (05) ◽  
pp. 445-459 ◽  
Author(s):  
FENGGUANG YANG ◽  
XIAOQUAN ZHOU ◽  
XINGNIAN LIU ◽  
SHUYOU CAO ◽  
ER HUANG
Keyword(s):  
Experimental Study ◽  
Slope Angle ◽  
Stage Iv ◽  
Seepage Flow ◽  
Dam Break ◽  
Angle Of Repose ◽  
Dam Breach ◽  
Downstream Slope ◽  
Sediment Particles ◽  
Constant Slope

This paper describes an experimental study into the angle of repose for uniform sediment particles, which is important in describing the dam-break process. Two types of setups, Hele-Shaw cell and drum, were used in the experiments. Each experiment was conducted in two media, namely air and water. Based on the experimental data, an empirical formula that describes the angle of repose for uniform sediment particles under different mediums was developed. From the dam-break experiments, in general, four stages can be identified in the process of breach erosion. In Stage I, the downstream slope angle of the channel increased from an initial value θ0 to θ1. In Stage II, retrograde erosion of the crest at the breached point occurred at constant angle due to seepage flow, leading to a decrease in the width of the crest of the dam in the breach. This stage ends when the crest vanishes. In Stage III, the breach continues to grow mainly laterally with the erosion propagating to the upstream slope, with the retrogressing downstream slope maintaining a constant slope. In Stage IV, the flow velocities in the breach become so small that the breach erosion stops. The results also show that the dam-breach growth process is developed with the eroding crest retrogressing at critical angle of sediment particles used for building the dam for Stages II and III and the results agree well with previous studies.

scholarly journals Study of Dam-break Due to Overtopping of Four Small Dams in the Czech Republic

2015 ◽  
Vol 63 (3) ◽  
pp. 717-729 ◽  
Author(s):  
Zakaraya Alhasan ◽  
Jan Jandora ◽  
Jaromír Říha
Keyword(s):  
Czech Republic ◽  
Reasonable Agreement ◽  
Field Data ◽  
Computer Code ◽  
Dam Break ◽  
Embankment Dam ◽  
Dam Breach ◽  
The Czech Republic ◽  
One Dimensional ◽  
Small Dams

Dam-break due to overtopping is one of the most common types of embankment dam failures. During the floods in August 2002 in the Czech Republic, several small dams collapsed due to overtopping. In this paper, an analysis of the dam break process at the Luh, Velký Bělčický, Melín, and Metelský dams breached during the 2002 flood is presented. Comprehensive identification and analysis of the dam shape, properties of dam material and failure scenarios were carried out after the flood event to assemble data for the calibration of a numerical dam break model. A simple one-dimensional mathematical model was proposed for use in dam breach simulation, and a computer code was compiled. The model was calibrated using the field data mentioned above. Comparison of the erodibility parameters gained from the model showed reasonable agreement with the results of other authors.

A Simple Model for Natural Dam Break: I Formulation

2011 ◽  
Vol 243-249 ◽  
pp. 838-843 ◽  
Author(s):  
Chao Dang ◽  
Yu Ding ◽  
Zun Lan Cheng ◽  
Na Na Chu
Keyword(s):  
Slope Angle ◽  
Iterative Solution ◽  
Dam Break ◽  
Flood Routing ◽  
Dam Breach ◽  
Wide Range ◽  
Downstream Reach ◽  
Floodplain Inundation ◽  
Natural Dam ◽  
Bottom Width

A mathematical model to simulate the natural dam break process and to forecast the flood hydrograph in the breach is developed in this paper. The breach is assumed trapezoidal, coupling with the bottom width and side slope angle keeping constants during the overall process of dam breach. Simulation of dam breach evolution is based on the conservation of mass of reservoir capacity and sediment transport capacity. Particularly, broad-crest weir relation is utilized to simulate the outflow in the breach, and an empirical equation is used to compute the rate of erosion in the breached section. Because of the implicit form of these equations, an iterative solution is proposed with convergence achieved in a few iterations. The model can be used by engineers or decision makers for a wide range of applications including risk assessment of natural dams, flood routing forecasting in the downstream reach as well as floodplain inundation mapping .

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