scholarly journals 2D-HEC-RAS Modeling of Flood Wave Propagation in a Semi-Arid Area Due to Dam Overtopping Failure

2021 ◽  
Vol 7 (9) ◽  
pp. 1501-1514
Author(s):  
Ibtisam R. Karim ◽  
Zahraa F. Hassan ◽  
Hassan Hussein Abdullah ◽  
Imzahim A. Alwan
Keyword(s):  
Wave Propagation ◽  
Flow Velocity ◽  
Water Depth ◽  
Dam Break ◽  
Flood Wave ◽  
Dam Breach ◽  
Inundation Maps ◽  
Overtopping Failure ◽  
Dam Overtopping ◽  
The Impact

Dam overtopping failure and the resulting floods are hazardous events that highly impact the inundated areas and are less predictable. The simulation of the dam breach failure and the flood wave propagation is necessary for assessing flood hazards to provide precautions. In the present study, a two-dimensional HEC-RAS model was used to simulate the flood wave resulting from the hypothetical failure of Al-Udhaim Dam on Al-Udhaim River, Iraq, and the propagation of the resulting dam-break wave along 100 km downstream the dam site for the overtopping scenario. The main objective is to analyze the propagation of the flood wave so that the failure risk on dam downstream areas can be assessed and emergency plans may be provided. The methodology consisted of two sub-models: the first is the dam breach failure model for deriving the breach hydrograph, and the second is the hydrodynamic model for propagating the flood wave downstream of the dam. The breach hydrograph is used as an upstream boundary condition to derive the flood impact in the downstream reach of Al- Udhaim River. The flood inundation maps were visualized in RAS-Mapper in terms of water surface elevation, water depth, flow velocity, and flood arrival time. The maximum recorded values were: 105 m (a.m.s.l.), 18 m, 5.5 m/s, and, respectively. The flow velocity decreased from upstream to downstream of the terrain, which means less risk of erosion in the far reaches downstream of the study area. The inundation maps indicated that the water depth and flow velocity were categorized as Catastrophic limits on the terrain's area. The results offer a way to predict flood extent and showed that the impact of a potential dam break at Al-Udhiam Dam will be serious, therefore, suitable management is needed to overcome this risk. Moreover, the maps produced by this study are useful for developing plans for sustainable flood management. Doi: 10.28991/cej-2021-03091739 Full Text: PDF

Dam-Breach Flood Wave Propagation Using Dimensionless Parameters

2003 ◽  
Vol 129 (10) ◽  
pp. 777-782 ◽  
Author(s):  
Victor M. Ponce ◽  
Ahmad Taher-shamsi ◽  
Ampar V. Shetty
Keyword(s):  
Wave Propagation ◽  
Flood Wave ◽  
Dam Breach ◽  
Dimensionless Parameters

scholarly journals Dam Break Wave Propagation on a Non- Erodible Bed – Comparison of Experimental and Numerical Results

2021 ◽  
Vol 9 (6) ◽  
pp. 733-740
Keyword(s):  
Wave Propagation ◽  
Risk Mitigation ◽  
Shallow Water Equation ◽  
Fixed Bed ◽  
Maximum Velocity ◽  
Dam Break ◽  
Maximum Height ◽  
Flood Wave ◽  
Downstream Side ◽  
The Cost

Dams are vital for production of electricity, storage of water and irrigation purposes but pose a serious risk to the community, if breached. The downstream flood wave propagation, resulting from failure of a dam can subject the population and infrastructure to considerable damage. No matter how low the chances of failure, the cost of failure makes it a higher risk. Mitigation of such risks requires better understanding of the hazard that a dam may pose in case of failure. This study focuses on the effects of flood wave propagation on a fixed bed on the downstream side resulting from sudden dam break. Two conditions are simulated: 1. when the downstream side is open, 2. when the downstream side is closed. It is observed that the flood wave diminishes in velocity and height with increase in time for both cases. For downstream open condition, the flood wave attains maximum height in 2 to 4 sec and maximum velocity within 2 to 5 sec. For downstream closed condition, the flood wave attains maximum height within 5to 10 sec and maximum velocity within 3 to 5 sec. The results obtained from the two-dimensional shallow water equation based numerical model are in close agreementwith the experimental results.

1‐D Dam‐Break Flood‐Wave Propagation on Dry Bed

1987 ◽  
Vol 113 (12) ◽  
pp. 1510-1524 ◽  
Author(s):  
Constantine V. Bellos ◽  
John G. Sakkas
Keyword(s):  
Wave Propagation ◽  
Dam Break ◽  
Flood Wave

scholarly journals Potential Dam Breach Analysis and Flood Wave Risk Assessment Using HEC-RAS and Remote Sensing Data: A Multicriteria Approach

Water ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 364
Author(s):  
Emmanouil Psomiadis ◽  
Lefteris Tomanis ◽  
Antonis Kavvadias ◽  
Konstantinos X. Soulis ◽  
Nikos Charizopoulos ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Remote Sensing Data ◽  
Water Volume ◽  
Surface Model ◽  
Flood Wave ◽  
Dam Breach ◽  
Sensing Data ◽  
Crete Island ◽  
Hydrogeological Characteristics ◽  
The Impact

Dam breach has disastrous consequences for the economy and human lives. Floods are one of the most damaging natural phenomena, and some of the most catastrophic flash floods are related to dam collapses. The goal of the present study is to analyse the impact of a possible failure–collapse on a potentially affected area downstream of the existing Bramianos dam on southern Crete Island. HEC-RAS hydraulic analysis software was used to study the dam breach, the flood wave propagation, and estimate the extent of floods. The analysis was performed using two different relief datasets of the same area: a digital elevation model (DEM) taken from very high-resolution orthophoto images (OPH) of the National Cadastre and Mapping Agency SA and a detailed digital surface model (DSM) extracted from aerial images taken by an unmanned aerial vehicle (UAV). Remote sensing data of the Sentinel-2 satellite and OPH were utilised to create the geographic information system (GIS) layers of a thorough land use/cover classification (LULC) for the potentially flooded area, which was used to assess the impact of the flood wave. Different dam breach and flood scenarios, where the water flows over man-made structures, settlements, and olive tree cultivations, were also examined. The study area is dominated mainly by three geological formations with different hydrogeological characteristics that dictated the positioning and structure of the dam and determine the processes that shape the geomorphology and surface roughness of the floodplain, affecting flow conditions. The results show that the impact of a potential dam break at Bramianos dam is serious, and appropriate management measures should be taken to reduce the risk. The water flow downstream of the collapsed dam depends on the water volume stored in the reservoir. Moreover, the comparison of DSM and DEM cases shows that the detailed DSM may indicate more accurately the surface relief and existing natural obstacles such as vegetation, buildings, and greenhouses, enabling more realistic hydraulic simulation results. Dam breach flood simulations and innovative remote sensing data can provide valuable outcomes for engineers and stakeholders for decision-making and planning in order to confront the consequences of similar incidents worldwide.

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