Mobility and Resilience : A Global Assessment of Flood Impacts on Road Transportation Networks
This study provides the first global evaluation of both direct and indirect flood hazard impacts on road transportation networks. It constructs topological road networks for 2,564 human settlements, representing over 14 million kilometers of urban...
| Main Authors: | , , , , , |
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| Format: | Working Paper |
| Language: | English |
| Published: |
World Bank, Washington, DC
2022
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| Subjects: | |
| Online Access: | http://documents.worldbank.org/curated/en/099552305172228687/IDU0e38cb88d018d704a8e08a220c09ce9f1be91 http://hdl.handle.net/10986/37452 |
| Summary: | This study provides the first global
evaluation of both direct and indirect flood hazard impacts
on road transportation networks. It constructs topological
road networks for 2,564 human settlements, representing over
14 million kilometers of urban roads. It assesses their
exposure to pluvial and fluvial flood risks under 10
scenarios, corresponding to different flood intensities (1:5
year to 1:1,000 year return periods). Under each scenario,
the study analyzes direct infrastructure exposure and
assesses the indirect effects of flood-induced mobility
disruptions: route failures, travel delays, and travel
distance increases. The results document a positive
relationship between flood return period and flood impact
(both direct and indirect). Compared with direct flood
hazard exposure, the indirect impact of floods on mobility
is more prominent and heterogeneous. The average share of
the road network that is flooded by at least 0.3 meters is
3.64 percent (or 24.84 percent) under the 5-year (or
1,000-year) return period, yet 11.58 percent (or 65.67
percent) of the simulated trips fail in the same scenario.
The results enable comparisons of exposure and vulnerability
of road networks to flood hazards across countries, allowing
the identification and prioritization of urban transport
resilience measures. |
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