HEC-RAS One-Dimensional Hydrodynamic Modelling for Recent Major Flood Events in Pahang River

Zainalfikry, Muhammad Kashfy; Ghani, Aminuddin Ab.; Zakaria, Nor Azazi; Chan, Ngai Weng

doi:10.1007/978-3-030-32816-0_83

Cited by 18 publications

(10 citation statements)

References 13 publications

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“…The 1D model of HEC-RAS has been widely used in river flood analysis [17][18][19][20][21][22][23][24], as well as their two-dimensional model [24][25][26][27][28]. In their newest version, HEC-RAS added the ability to perform combined 1D and 2D unsteady-flow routing within the unsteady flow model, allowing work on a larger river system, and implementing 2D modeling only in the areas that require a higher level of hydrodynamic precision.…”

Section: Coupled 1d-2d Methodsmentioning

confidence: 99%

Case Study of HEC-RAS 1D–2D Coupling Simulation: 2002 Baeksan Flood Event in Korea

Dasallas

Kim

2019

Water

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Recent studies strongly suggest the possibility of more frequent extreme events as a result of the changing climate. These weather extremes, such as excessive rainfall, result in debris flow, river overflow and urban flooding, which can pose a substantial threat to the community. An effective flood model is therefore a crucial tool in flood disaster control and mitigation. A number of flood models have been established in recent years. However, the major challenge in developing effective and accurate flood models is the disadvantage of running multiple models for separate, individual conditions. Among the solutions in recent research is the development of combined 1D–2D flood modeling. Coupled 1D–2D flood modeling allows the channel flows to be represented in 1D and the overbank flow to be modeled in 2D. In order to test the efficiency of the approach, this research aims to assess the capability of the U.S. Army Corps of Engineers Hydrologic Engineering Center River Analysis System (HEC-RAS) model’s implementation of the combined 1D–2D hydraulic computation in simulating river overflow inundation. For verification, the simulation is applied to the Baeksan river levee breach event in South Korea in 2011. The simulation results show similarities of the observed data and the outputs from widely used flood models. This proves the applicability of the HEC-RAS 1D–2D coupling method as a powerful tool in simulating accurate inundations for flood events.

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Section: Coupled 1d-2d Methodsmentioning

confidence: 99%

Case Study of HEC-RAS 1D–2D Coupling Simulation: 2002 Baeksan Flood Event in Korea

Dasallas

Kim

2019

Water

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“…At the same time, Patel et al [47] executed the 1-D model for an 11 km of the lower part of Ambica River, with 359 surveyed channel cross-section inputs that highlighted the importance of accurate geometry data in 1-D hydrodynamic model. These studies confirm the cost effectiveness, reduced complexity, and reliable prediction of water level along the river of the 1-D model [38]. In this paper, the 1-D modeling approach was applied to validate the base model and ability of HEC-RAS 5.0.7 to simulate extreme events of a flood wave in a downstream dam in the event of failure.…”

Section: One-dimensional Hec-ras Modelingmentioning

confidence: 59%

“…It is a well-established and well-tested model globally and is sometimes used as benchmarked against the performance of other hydrodynamic model simulation software [37]. This software permits users to estimate water surface profiles along a river with steady and unsteady flow river hydraulic calculations, including sediment transport modeling [38]. Energy and momentum Equations ( 1) and ( 2) are used to derive the 1-D Saint Venant equation in generating steady and unsteady state flow water surface profile simulations within HEC-RAS using an implicit finite different method [37].…”

Section: Hec-ras Flood Modelmentioning

confidence: 99%

Modeling and Risk Analysis of Dam-Break Flooding in a Semi-Arid Montane Watershed: A Case Study of the Yabous Dam, Northeastern Algeria

Gaagai

Aouissi

Krauklis

et al. 2022

Water

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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 the dam failure event correspond to various breach parameters, such as width, slope, and formation time. This study aimed to simulate the dam breach failure scenario of the Yabous dam (northeast Algeria) and analyze its influence on the related areas (urban and natural environments) downstream of the dam. The simulation was completed using the sensitivity analysis method to assess the impact of breach parameters and flooding on the dam break scenario. The flood wave propagation associated with the dam break was simulated using the one-dimensional HEC-RAS hydraulic model. This study applied a sensitivity analysis of three breach parameters (slope, width, and formation time) on five sites selected downstream of 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 1972.7 m3/s at about 8.5 km downstream the dam. This study established the map of flood risk areas that illustrated zones threatened by the flooding wave triggered 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 increases in adjustments (±25% and ±50%) of breach width and slope in the five sites. However, flood wave parameters of breach formation time showed significant trends that changed in the opposite direction compared to breach slope and width. Meanwhile, the adjustments (±25% and ±50%) of the flood hydrograph did not significantly influence the flood parameters downstream of the dam. In the present study, the HEC-RAS 1-D modeling demonstrated effectiveness in simulating the propagation of flood waves downstream of the dam in the event of dam failure and highlighted the impact of the breach parameters and the flood hydrographical pattern on flood wave parameters.

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“…However, the unaccounted rainfall in the river basin during the monsoon season (July to September) leads to excessive water flow, causing flooding (Ray & Goel, 2019). Subsequently, the river Narmada has been facing regular floods (Zainal Fikry et al, 2020). According to the Flood Memorandum (2021), in the last decade, the river faced the highest discharge in the years 2013 and 2014, respectively.…”

Section: The Study Areamentioning

confidence: 99%

Flood vulnerability assessment using data envelopment analysis – the case of Narmada river basin districts in central India

2021

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This paper presents a Data Envelopment Analysis (DEA) based framework for estimating the flood vulnerabilities in River basins. The methodology has been exemplified for the 21 districts of the Narmada River basin in central India. Sensitivity and adaptive capacity indicators have been identified and used for the development of the Flood Vulnerability Index (FVI). DEA based study was employed to assess the Scale Efficiencies and the Returns to Scale and insights drawn from the analysis have been discussed in the context of policy and planning related to reduction of flood vulnerabilities. Cluster analysis has also been deployed to classify districts in terms of flood vulnerabilities. Results from the flood vulnerability assessment model case study indicate that 76% of the districts in the Narmada River Basin remain highly vulnerable to flood-risk, while the socio-economic parameters and physical sizes of districts and their resources play a crucial role.

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HEC-RAS One-Dimensional Hydrodynamic Modelling for Recent Major Flood Events in Pahang River

Cited by 18 publications

References 13 publications

Case Study of HEC-RAS 1D–2D Coupling Simulation: 2002 Baeksan Flood Event in Korea

Case Study of HEC-RAS 1D–2D Coupling Simulation: 2002 Baeksan Flood Event in Korea

Modeling and Risk Analysis of Dam-Break Flooding in a Semi-Arid Montane Watershed: A Case Study of the Yabous Dam, Northeastern Algeria

Flood vulnerability assessment using data envelopment analysis – the case of Narmada river basin districts in central India

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