The effect of storm-induced precipitation on flooding in macau city
Yang,Jie1,2,3; Liu,Jiandong4; Kim,Dong Eon4; Li,Linlin5,6; Mok,Kai Meng7; Liu,Philip L.F.3,8,9
Source PublicationProceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
AbstractThe extent and depth of coastal flooding caused by tropical cyclone can be underestimated without considering the contribution by storm-induced precipitation. In this study, the dynamic flooding processes in Macau are simulated accounting for the combined effect of storm surge and precipitation during Typhoon Mangkhut in 2018. The surface wind and atmospheric pressure during this typhoon event are generated by a parametric vortex model and are used to drive a surge-tide- wave model for producing storm-induced water levels. The precipitation rate from ERA5 reanalysis data is utilized in this modelling suite as an additional source of water mass. The numerical model is first thoroughly validated by comparing the numerical results against the measured water levels and significant wave heights at tidal gauge and wave buoy stations. By switching on/off the rainfall function in the mass conservation and momentum equations, we compare and analyze the differences of inundation depths and inundation extent induced by precipitation. The differences in the maximum inundation depths vary spatially and the increments owing to precipitation are less than 50 mm in most flooded regions, the associated contribution is less than 10% in areas with moderate and severe flooding. The effect of precipitation as additional rainfallinduced forces in the momentum equations plays a more important role than that in the mass conservation. The inundation depths induced by tide and surge are approximately two times of that induced by precipitation. Moreover, the compound effects by ocean waves and precipitation tend to decrease the increment of precipitation-induced inundation depths by precipitation alone. Finally, we also assess the performance of the overland flow model Itzï on Macau Peninsula for the same typhoon event. The present study helps identifying vulnerable areas subject to heavy precipitation in Macau and gaining more understanding of flooding mechanisms by different physical drivers.
KeywordInundation simulation Itzï Pearl River Delta (PRD) Precipitation SCHISM-WWMIII Typhoon Mangkhut (2018)
URLView the original
Scopus ID2-s2.0-85099280540
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Document TypeConference paper
CollectionUniversity of Macau
Affiliation1.Key Laboratory of Coastal Disaster and Defence (Hohai University),Ministry of Education,Hohai University,Nanjing,China
2.College of Harbor,Coastal and Offshore Engineering,Hohai University,Nanjing,China
3.Department of Civil and Environmental Engineering,National University of Singapore,Singapore
4.Tropical Marine Science Institute,National University of Singapore,Singapore
5.Guangdong Provincial Key Laboratory of Geodynamics and Geohazards,School of Earth Sciences and Engineering,Sun Yat-Sen University,Guangzhou,China
6.Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai),Zhuhai,China
7.Department of Civil and Environmental Engineering,University of Macau,Macao
8.School of Civil and Environmental Engineering,Cornell University,United States
9.Institute of Hydrological and Ocean Research,National Central University,Taiwan
Recommended Citation
GB/T 7714
Yang,Jie,Liu,Jiandong,Kim,Dong Eon,et al. The effect of storm-induced precipitation on flooding in macau city[C],2020.
APA Yang,Jie,Liu,Jiandong,Kim,Dong Eon,Li,Linlin,Mok,Kai Meng,&Liu,Philip L.F..(2020).The effect of storm-induced precipitation on flooding in macau city.Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE,6A-2020.
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