Hurricanes and other natural hazards pose a severe threat to the agricultural industry, with long-lasting economic consequences. Specifically, these events can harm crops and livestock, disrupt harvest cycles, and damage essential farm structures. What is the interplay between rigorous engineering codes for structures in high-hazard areas and the need of the agricultural community to produce good results without massive expense? Researchers Gabriela Yáñez González and Christine E. Wittich sought to address this dichotomy, to understand the gap between designing for functionality and cost-effectiveness and designing for extreme wind events.
Their study “Virtual Reconnaissance and Fragility Analysis of Center Pivot Irrigation Systems and Poultry Houses Following Hurricane Idalia,” investigates the wind vulnerability of critical agricultural infrastructure. The authors performed a virtual reconnaissance using high-resolution aerial imagery and county property appraiser databases to evaluate damage to center pivot irrigation systems and poultry houses in northern Florida, following Hurricane Idalia, which struck in August 2023.
They analyzed variable independence to compare failure rates across structural groupings, implemented multivariate logistic regression models, and developed lognormal cumulative distribution fragility functions. By providing probabilistic fragility analysis of these structures using postevent virtual reconnaissance data, engineers can enable better risk assessment, mitigation planning, and community resilience decision-making. Learn how agricultural producers, engineers, and emergency planners can improve rural community resilience in the Journal of Performance of Constructed Facilities at https://ascelibrary.org/doi/10.1061/JPCFEV.CFENG-5479. The abstract is below.
Abstract
Agricultural structures, including center pivot irrigation systems and poultry houses, are critical in sustaining food production and supporting the economy, particularly in the United States’ rural communities. The vulnerability of these structures to extreme wind events, such as hurricanes and derechos, can significantly disrupt agricultural operations, affecting food supply, local economies, and livelihoods. These structures are not only vital for the functioning of farms but also deeply intertwined with the resilience of agricultural communities. Despite their importance, there is limited understanding of how these structures perform under extreme weather conditions and how their failure affects agricultural productivity, community recovery, and resilience. This paper investigates the impact of strong winds on center pivot irrigation systems and poultry houses, leveraging the event of Hurricane Idalia in northern Florida. A probabilistic analysis of post-event aerial imagery was performed to assess the damage to the agricultural structures and identify key variables correlated to their vulnerability. Notably, shorter center pivot irrigation systems have a higher probability of withstanding strong winds. Within the Hurricane Idalia dataset, longer poultry houses exhibited lower observed damage rates within construction-age groups; however, multivariate analysis indicates that wind speed and construction era are the most consistent predictors of damage probability, with geometric effects contributing more modest conditional influence. By quantifying the structural characteristics associated with reduced wind vulnerability, this paper provides evidence that can inform design improvements and targeted mitigation strategies to bolster the resilience of agricultural communities.
Explore the findings and recommendations in more detail in the ASCE Library: https://ascelibrary.org/doi/10.1061/JPCFEV.CFENG-5479.
