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Estimating impacts of recurring flooding on roadway networks: a Norfolk, Virginia case study

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Abstract

Climate change and sea level rise have increased the frequency and severity of flooding events in coastal communities. This study quantifies transportation impacts of recurring flooding using crowdsourced traffic and flood incident data. Agency-provided continuous count station traffic volume data at 12 locations is supplemented by crowd-sourced traffic data from location-based apps in Norfolk, Virginia, to assess the impacts of recurrent flooding on traffic flow. A random forest data predictive model utilizing roadway features, traffic flow characteristics, and hydrological data as inputs scales the spatial extent of traffic volume data from 12 to 7736 roadway segments. Modeling results suggest that between January 2017 and August 2018, City of Norfolk reported flood events reduced 24 h citywide vehicle-hours of travel (VHT) by 3%, on average. To examine the temporal and spatial variation of impacts, crowdsourced flood incident reports collected by navigation app Waze between August 2017 and August 2018 were also analyzed. Modeling results at the local scale show that on weekday afternoon and evening periods, flood-impacted areas experience a statistically significant 7% reduction in VHT and 12% reduction in vehicle-miles traveled, on average. These impacts vary across roadway types, with substantial decline in traffic volumes on freeways, while principal arterials experience increased traffic volumes during flood periods. Results suggest that analyzing recurring flooding at the local scale is more prudent as the impact is temporally and spatially heterogeneous. Furthermore, countermeasures to mitigate impacts require a dynamic strategy that can adapt to conditions across various time periods and at specific locations.

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Funding

This project is funded by National Science Foundation’s Critical Resilient Interdependent Infrastructure Systems and Planning (CRISP) Award: 1735587.

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The authors confirm contribution to the paper as follows: study conception and design: T. D. C, S. P, M. B, J. G; data collection: S. P; analysis and interpretation of results: S. P, F. Z, T. D. C, J. G; draft manuscript preparation: S. P, T. D. C, F. Z, J. G. All authors reviewed the results and approved the final version of the manuscript.

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Correspondence to T. Donna Chen.

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Praharaj, S., Chen, T.D., Zahura, F.T. et al. Estimating impacts of recurring flooding on roadway networks: a Norfolk, Virginia case study. Nat Hazards 107, 2363–2387 (2021). https://doi.org/10.1007/s11069-020-04427-5

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  • DOI: https://doi.org/10.1007/s11069-020-04427-5

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