Peak discharge prediction due to embankment dam break by using sensitivity analysis based ANN

2014 ◽  
Vol 18 (6) ◽  
pp. 1868-1876 ◽  
Author(s):  
Ali Osman Pektas ◽  
Tarkan Erdik
Keyword(s):  
Sensitivity Analysis ◽  
Dam Break ◽  
Peak Discharge ◽  
Embankment Dam

scholarly journals Modeling and Risk Analysis of Dam-Break Flooding in a Semi‐Arid Montane Watershed.

2021 ◽  
Author(s):  
Aissam Gaagai ◽  
Hani Amir Aouissi ◽  
Andrey E. Krauklis ◽  
Juris Burlakovs ◽  
Ali Athamena ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Maximum Flow ◽  
Dam Break ◽  
Formation Time ◽  
Dam Failure ◽  
Wave Flow ◽  
Flood Wave ◽  
Embankment Dam ◽  
Breach Parameters ◽  
The Impact

The risk related to embankment dam breaches needs to be evaluated in order to prepare emergency action plans. The physical and hydrodynamic parameters of the flood wave generated from dam-failure event correspond to various breach parameters such as width, slope and formation time. This study aimed to simulate dam-breach failure scenario of Yabous dam (NE Algeria) and analyze its influence on areas (urban and natural environments) downstream the dam. The simulation was completed using the sensitivity analysis method in order to assess the impact of breach parameters on the dam-break scenario. The propagation of flood wave associated to dam-break was simulated using the one-dimensional HEC-RAS hydraulic model. This study ap-plied a sensitivity analysis of three breach parameters (slope, width, and formation time) in five sites selected downstream the embankment dam. The simulation showed that the maximum flow of the flood wave recorded at the level of the breach was 8768 m3/s, which gradually attenuated along the river course to reach 1579.2m3/s at about 8.5km downstream the dam. This study estab-lished the map of flood-prone areas that illustrated zones threatened with the flooding wave trig-gered by the dam failure due to extreme rainfall events. The sensitivity analysis showed that flood wave flow, height and width revealed positive and similar changes for the increase in adjustments (±25% and ±50%) of breach width and slope in the 5 sites. However, flood wave parameters of breach formation time showed significant trends that changed in the opposite direction compared to breach slope and width.

scholarly journals Sensitivity Analysis of Model Parameters used in a Coupled Dam-Break/FLO-2D Model to Simulate Flood Inundation

2014 ◽  
Vol 24 (1) ◽  
pp. 53-67 ◽  
Author(s):  
Khil-Ha Lee ◽  
Myung-Ho Son ◽  
Sung-Wook Kim ◽  
Soonyoung Yu ◽  
Jin-Woo Cho ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Dam Break ◽  
Model Parameters ◽  
Flood Inundation ◽  
2D Model

scholarly journals Dam Break Modeling in a Cascade of Small Earthen Dams: Case Study of the Čižina River in the Czech Republic

Water ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 2309
Author(s):  
Jaromír Říha ◽  
Stanislav Kotaška ◽  
Lubomír Petrula
Keyword(s):  
Hydraulic Modeling ◽  
Dam Break ◽  
Peak Discharge ◽  
Flood Routing ◽  
Small Reservoirs ◽  
Small Dams ◽  
Flood Volume ◽  
Exponential Trend ◽  
Earthen Dams

Failures of small dams can pose a serious threat to people and property even if the size of the schemes is relatively low. In many cases, small dams are situated in a cascade along streams, meaning that the failure of the uppermost dam may cause the dams downstream to fail. In this paper, a cascade of three small reservoirs, Lichnov II (14.6 m high), Lichnov III (10 m high), and Pocheň (8.5 m high), is the subject of the dam break analyses carried out via various methods such as empirical formulae, analogy, and hydraulic modeling. The dam-break flood routing was simulated using a shallow water flow hydraulic model. The simulations confirm that the attenuation effect of the peak discharge is governed by the flood volume, slope, and morphology of the floodplain and increases with the distance from the breached dam following an approximately exponential trend. When estimating peak discharge, empirical formulae derived for a single dam break should be applied carefully as they may underestimate the peak outflow by up to 10% in the case of a dam cascade. The attenuation volume of small reservoirs is small when compared to the flood volume, meaning that the attenuation of the peak discharge usually varies between 5–10%.

scholarly journals Numerical Simulation and Risk Assessment of Cascade Reservoir Dam-Break

Water ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1730 ◽  
Author(s):  
Liangming Hu ◽  
Xu Yang ◽  
Qian Li ◽  
Shuyu Li
Keyword(s):  
Risk Assessment ◽  
Flood Control ◽  
Engineering Application ◽  
Dam Break ◽  
Flood Routing ◽  
Embankment Dam ◽  
Cascade Reservoirs ◽  
Whole Process ◽  
Barrier Lake ◽  
Outflow Rate

Despite the fact that cascade reservoirs are built in a large number of river basins nowadays, there is still an absence of studies on sequential embankment dam-break in cascade reservoirs. Therefore, numerical simulations and risk analyses of cascade reservoir dam-break are of practical engineering significance. In this study, by means of contacting the hydraulic features of upstream and downstream reservoirs with flood routing simulation (FRS) and flood-regulating calculation (FRC), a numerical model for the whole process of cascade reservoir breaching simulation (CRBS) is established based on a single-embankment dam-break model (Dam Breach Analysis—China Institute of Water Resources and Hydropower Research (DB-IWHR)). In a case study of a fundamental cascade reservoir system, in the upstream Tangjiashan barrier lake and the downstream reservoir II, the whole process of cascade reservoir dam-break is simulated and predicted under working schemes of different discharge capacities, and the risk of cascading breaching was also evaluated through CRBS. The results show that, in the dam-break of Tangjiashan barrier lake, the calculated values of the peak outflow rate are about 10% more than the recorded data, which are in an acceptable range. In the simulation of flood routing, the dam-break flood arrived at the downstream reservoir after 3 h. According to the predicted results of flood-regulating calculations and the dam-break simulation in the downstream reservoir, the risk of sequential dam-break can be effectively reduced by setting early warnings to decrease reservoir storage in advance and adding a second discharge tunnel to increase the discharge capacity. Alongside the simulation of flood routing and flood regulation, the whole process of cascade dam-break was completely simulated and the results of CRBS tend to be more reasonable; CRBS shows the great value of engineering application in the risk assessment and flood control of cascade reservoirs as an universal numerical prediction model.

scholarly journals Using 2D HEC-RAS Modeling and Embankment Dam Break Scenario for Assessing the Flood Control Capacity of a Multi-Reservoir System (NE Romania)

Water ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 57
Author(s):  
Andrei Urzică ◽  
Alin Mihu-Pintilie ◽  
Cristian Constantin Stoleriu ◽  
Cătălin Ioan Cîmpianu ◽  
Elena Huţanu ◽  
...  
Keyword(s):  
Flood Control ◽  
Flood Hazard ◽  
Hydraulic Modeling ◽  
Dam Break ◽  
Recurrence Interval ◽  
Flood Mitigation ◽  
Dam Failure ◽  
Inflow Rate ◽  
Embankment Dam ◽  
Reservoir System

Using hydraulic modeling techniques (e.g., one-dimensional/two-dimensional (1D/2D) hydraulic modeling, dam break scenarios) for extracting the flood settings is an important aspect of any action plan for dam failure (APDF) and flood mitigation strategy. For example, the flood hydraulic models and dam break scenario generated based on light detection and ranging (LiDAR)-derived digital elevation models (DEMs) and processed in the dedicated geographic information systems (GIS) and hydraulic modeling software (e.g., HEC-RAS—Hydrologic Engineering Center River Analysis System, developed by USACE HEC, Davis, CA, USA) can improve the flood hazard maps in case of potentially embankment dam failure. In this study, we develop a small-scale conceptual approach using 2D HEC-RAS software according to the three embankment dam break scenarios, LiDAR data (0.5 m spatial resolution), and 2D hydraulic modeling for the Başeu multi-reservoir system which belongs to the Başeu River (NE Romania) including R1—Cal Alb reservoir, R2—Movileni reservoirs, R3—Tătărăşeni reservoirs, R4—Negreni reservoirs, and R5—Hăneşti reservoirs. In order to test the flood control capacity of the Bașeu multi-reservoir system, the Cal Alb (R1) dam break scenario (piping failure) was taken into account. Three 2D stream flow modeling configurations based on R1 inflow rate with a 1% (100 year), 0.5% (500 year), and 0.1% (1000 year) recurrence interval and the water volume which can be accumulated with that specific inflow rate (1% = 10.19 × 106 m3; 0.5% = 12.39 × 106 m3; 0.1% = 17.35 × 106 m3) were computed. The potential flood wave impact was achieved on the basis of different flood severity maps (e.g., flood extent, flood depth, flood velocity, flood hazard) generated for each recurrence interval scenario and highlighted within the built-up area of 27 settlements (S1–S27) located downstream of R1. The results showed that the multi-reservoir system of Bașeu River has an important role in flood mitigation and contributes to the APDF in the context of climate change and the intensification of hydrological hazard manifestation in northeastern Romania.

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.

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