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Open AccessArticle

An Operational High-Performance Forecasting System for City-Scale Pluvial Flash Floods in the Southwestern Plain Areas of Taiwan

1
National Science and Technology Center for Disaster Reduction, New Taipei City 23143, Taiwan
2
Department of Geosciences, National Taiwan University, Taipei City 10617, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Giuseppe T. Aronica
Water 2021, 13(4), 405; https://doi.org/10.3390/w13040405
Received: 31 December 2020 / Revised: 29 January 2021 / Accepted: 2 February 2021 / Published: 4 February 2021
A pluvial flash flood is rapid flooding induced by intense rainfall associated with a severe weather system, such as thunderstorms or typhoons. Additionally, topography, ground cover, and soil conditions also account for the occurrence of pluvial flash floods. Pluvial flash floods are among the most devastating natural disasters that occur in Taiwan, and these floods always /occur within a few minutes or hours of excessive rainfall. Pluvial flash floods usually threaten large plain areas with high population densities; therefore, there is a great need to implement an operational high-performance forecasting system for pluvial flash flood mitigation and evacuation decisions. This study developed a high-performance two-dimensional hydrodynamic model based on the finite-element method and unstructured grids. The operational high-performance forecasting system is composed of the Weather Research and Forecasting (WRF) model, the Storm Water Management Model (SWMM), a two-dimensional hydrodynamic model, and a map-oriented visualization tool. The forecasting system employs digital elevation data with a 1-m resolution to simulate city-scale pluvial flash floods. The extent of flooding during historical inundation events derived from the forecasting system agrees well with the surveyed data for plain areas in southwestern Taiwan. The entire process of the operational high-performance forecasting system prediction of pluvial flash floods in the subsequent 24 h is accomplished within 8–10 min, and forecasts are updated every six hours. View Full-Text
Keywords: city-scale pluvial flash flood; plain area; operational high-performance forecasting system; two-dimensional hydrodynamic model city-scale pluvial flash flood; plain area; operational high-performance forecasting system; two-dimensional hydrodynamic model
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MDPI and ACS Style

Chang, T.-Y.; Chen, H.; Fu, H.-S.; Chen, W.-B.; Yu, Y.-C.; Su, W.-R.; Lin, L.-Y. An Operational High-Performance Forecasting System for City-Scale Pluvial Flash Floods in the Southwestern Plain Areas of Taiwan. Water 2021, 13, 405. https://doi.org/10.3390/w13040405

AMA Style

Chang T-Y, Chen H, Fu H-S, Chen W-B, Yu Y-C, Su W-R, Lin L-Y. An Operational High-Performance Forecasting System for City-Scale Pluvial Flash Floods in the Southwestern Plain Areas of Taiwan. Water. 2021; 13(4):405. https://doi.org/10.3390/w13040405

Chicago/Turabian Style

Chang, Tzu-Yin; Chen, Hongey; Fu, Huei-Shuin; Chen, Wei-Bo; Yu, Yi-Chiang; Su, Wen-Ray; Lin, Lee-Yaw. 2021. "An Operational High-Performance Forecasting System for City-Scale Pluvial Flash Floods in the Southwestern Plain Areas of Taiwan" Water 13, no. 4: 405. https://doi.org/10.3390/w13040405

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