An integrated flood risk assessment approach based on coupled hydrological-hydraulic modeling and bottom-up hazard vulnerability analysis. (February 2022)

• Record Type: Journal Article
• Authors: Zhang, Ke; Shalehy, Md Halim; Ezaz, Gazi Tawfiq; Chakraborty, Arup; Mohib, Kazi Mushfique; Liu, Linxin
• Is Part Of: Environmental modelling & software. Volume 148(2022)
• Publication Date: 2022-02
• Subjects: Bottom-up hazard vulnerability -- Coupled hydrological-hydraulic model -- Flood frequency analysis -- Flood risk assessment -- Old Brahmaputra River floodplain; Environmental monitoring -- Computer programs -- Periodicals; Ecology -- Computer simulation -- Periodicals; Digital computer simulation -- Periodicals; Computer software -- Periodicals; Environmental Monitoring -- Periodicals; Computer Simulation -- Periodicals; Environnement -- Surveillance -- Logiciels -- Périodiques; Écologie -- Simulation, Méthodes de -- Périodiques; Simulation par ordinateur -- Périodiques; Logiciels -- Périodiques; Computer software; Digital computer simulation; Ecology -- Computer simulation; Environmental monitoring -- Computer programs; Periodicals; Electronic journals; 363.70015118
• DOI: 10.1016/j.envsoft.2021.105279
• Languages: English
• ISSNs: 1364-8152

Abstract

Abstract: Accurately quantifying and assessing the flood risks is critical for flood hazard mitigation and prevention. This study proposed a new integrated flood risk assessment framework to map flood risk, hazard and vulnerability by coupling the HEC-HMS hydrological model, the HEC-RAS 1D and 2D hydraulic models, and a bottom-up hazard vulnerability analysis. The Old Brahmaputra River floodplain of Bangladesh, a flood-prone region, was chosen as a case study. The coupled hydrological-hydraulic model shows a comparable robust performance in both calibration and validation periods with Nash-Sutcliffe efficiency coefficient = 0.93 (0.81), coefficient of determination = 0.95 (0.89), and percent bias = −1.17% (2.40%) for the calibration (validation) period. Our results indicate that the assessed risk levels are roughly consistent with the overall property distribution and flood-hazard potential in the study area. The proposed framework and associated findings are valuable for developing adaptation strategies and early-warning systems to reduce flood impacts in the future. Highlights: Developed an integrated flood risk assessment framework to map flood risk, hazard and vulnerability. Coupled the HEC-HMS hydrological model, the HEC-RAS hydraulic models, and a bottom-up hazard vulnerability analysis. Mapped flood risks of the flood-prone Old Brahmaputra River floodplain of Bangladesh. Provided a used modeling system for flood adaptation and early-warning.