Engineering Climate-Resilient Infrastructure for Coastal Mega-Cities under Rising Sea Levels

Abstract

This study investigates the engineering of climate-resilient infrastructure for coastal mega-cities facing the escalating threat of rising sea levels. Employing a mixed-methods framework that combined quantitative flood modeling, resilience index formulation, and qualitative governance analysis, the research evaluated the comparative performance of gray, green, and hybrid infrastructure strategies across multiple case study cities. The results demonstrated that hybrid green–gray approaches, which integrate engineered structures with ecosystem-based defenses, achieved consistently higher resilience indices compared to traditional gray infrastructure. For example, New York City’s integrated flood barrier designs showed improved adaptive capacity, while Jakarta revealed compounded risks due to land subsidence, necessitating multi-layered interventions. Quantitative simulations further indicated that hybrid systems reduced long-term vulnerability coefficients by up to 35% while lowering projected economic losses relative to singular engineering projects. Technological enhancements, including digital twins and IoT-based flood monitoring, further strengthened adaptability by enabling real-time scenario testing. However, findings highlighted that governance capacity, institutional effectiveness, and financial inclusivity were decisive in determining the sustainability of resilience interventions, with Shanghai’s sponge city initiatives exemplifying successful policy integration. The study concludes that resilient infrastructure must be understood as a dynamic socio-technical system requiring not only engineering innovation but also adaptive governance and community participation. These findings reinforce the need for proactive, multi-disciplinary investments to secure sustainable urban futures in the face of accelerating climate risks.