Experimental Study on Coastal Drainage Solutions for Ky Anh Urban Area, Ha Tinh Province, Vietnam
DOI:
https://doi.org/10.31272/jeasd.3956الكلمات المفتاحية:
Coastal urban drainage، Hydrodynamic modeling، Ky Anh ، Vietnam، Tidal، Urban Floodingالملخص
In the Central region of Vietnam, the heavy rains, low land, tidal influence, and rapid urbanization have caused coastal urban flooding to be a major and growing concern. This study focuses on assessing the drainage capacity and proposing flood drainage solutions for the Ky Anh urban area (Ha Tinh Province) through an integrated hydrological-hydraulic modeling approach. The MIKE modeling system was applied to study, including MIKE NAM, MIKE 11, MIKE 21 FM, and MIKE FLOOD. Calculation scenarios were developed based on the historical rainfall event of October 2020, combined with a 10% design tidal range and climate change projections. Simulation results indicate that the existing drainage system in Ky Anh has exceeded its capacity, resulting in severe and prolonged flooding under adverse rainfall–tidal interaction conditions. Unidirectional drainage solutions offer limited effectiveness, whereas diversion schemes and multidirectional combined solutions yield superior results. Analysis shows that peak flood levels were reduced by 0.7–0.9 m, alongside a reduction in inundated areas of over 60% and a significant shortening of flooding duration. The study confirms that a systems-based, inter-regional, and modeling-based drainage approach is a crucial scientific basis for planning and managing coastal urban areas adapted to climate change.
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