Moyang River floods in September 2023 in Guangdong:an evaluation and study on river basin flood control
From September 8 to 13,2023,catastrophic floods induced by Typhoon"Haikui"severely impacted the Moyang River basin in Guangdong Province,causing widespread damage in several towns and streets in Yangjiang City.Using collected meteorological and hydrological data,coupled with the Xin'anjiang model and MIKE 11 hydrodynamic model,this study conducted an in-depth analysis of the flood's causes,evolution process,and weaknesses in the existing flood control system.Corresponding improvement measures and suggestions are proposed.The results reveal that during the flood routing process,the scientific operation of the Dahe Reservoir significantly mitigated downstream flood pressure,reducing what would have been a 100-year flood event to a 20-year flood event.The maximum peak flow was decreased by 21.4%.However,evaluations identified two primary issues in the basin's current flood control system:low-standard embankments in certain areas and inadequate drainage capacity in flood-prone regions.To address these issues,the study proposes an integrated flood control strategy combining structural and non-structural measures.For structural measures,it is recommended to accelerate the comprehensive improvement project at the Moyang River estuary,optimize embankments and drainage infrastructure,and construct key reservoirs for flood regulation.For non-structural measures,the emphasis should be on strengthening flood forecasting and scheduling systems to enhance prediction and regulation capabilities.
Moyang River floods in September 2023Yangjiang Cityhydrological modelhydraulic modelflood control and drainage issues
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