Coastal regions and estuaries worldwide are characterized by dense populations, thriving economic activities, and abundant natural resources. However, these areas are highly susceptible to adverse weather conditions and face recurring challenges from natural hazards, such as rising sea levels and extreme events. My research focuses on understanding the dynamic responses of estuaries to both natural and human-induced geomorphic changes (e.g., reduced wetland areas, shipping channels widening and deepening due to navigational developments). These changes often diminish the natural protective features against storms and rising sea levels. Additionally, I investigate the effects of sea-level rise and climate-driven variations in storm surge characteristics on the risk of coastal flooding. To address these issues, I explore innovative solutions rooted in nature-based approaches and eco-hydraulics to mitigate the geomorphic and climatic alterations that intensify flood risks in already vulnerable coastal regions.