Enhancing Infrastructure Resilience Through Emergency Bridge Reconstruction: Lessons from the 2023 Tsarevo Floods

Extreme rainfall events on 4-5 September 2023 caused severe flooding in the municipality of Tsarevo (Bulgaria), resulting in significant damage to local infrastructure, including the destruction of multiple bridge structures over the Cherna River. The event led to substantial material losses and human casualties, prompting the declaration of a partial state of emergency. The rapid increase in river and stream water levels caused extensive erosion of riverbanks, undermining reinforced-concrete abutments and piers, flooding urbanized areas, and depositing large quantities of debris, sediments, and vegetation within the riverbeds. This paper presents the emergency reconstruction measures undertaken to restore the affected bridge structures and adjacent infrastructure. The main objectives include: (1) improving the long-term structural performance and loadbearing capacity of the new bridge designs; (2) ensuring safe and reliable traffic conditions and enhanced user comfort; (3) increasing hydraulic capacity to prevent future extreme overflow events; and (4) achieving an environmentally harmonious and aesthetically coherent river corridor. The study discusses the engineering considerations, design criteria, and risk-mitigation strategies applied during the reconstruction process. The proposed solutions aim to enhance the resilience of critical infrastructure to future hydrological extremes, contributing to improved regional safety and sustainable development.

Keywords: Emergency bridge reconstruction, Infrastructure resilience, Structural reliability, Hydraulic capacity, Flood damage assessment.