Highways in the Coastal Environment: Hydraulic Engineering Circular Number 25 - Third Edition
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2020-01-01
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Abstract:This manual presents tools for the planning, design, and operation of highways in the coastal environment. It focuses on roads near the coast that are influenced by coastal tides and waves constantly, or occasionally during storms. FHWA estimates that there are more than 60,000 miles of these "coastal highways" in the US. A primary goal is the integration of coastal engineering principles and practices in the planning and design of these roads and bridges to make them more resilient. The manual summarizes coastal science concepts and modeling tools that have been developed by the coastal engineering community, and are applicable to highways. This includes engineering tools for estimating water levels, waves, and sand movement. Coastal highway applications include coastal revetment design; planning and alternatives for highways that are threatened by coastal erosion, including nature-based solutions; roads that overwash in storms; roads that are experiencing increased flooding due to sea level rise; coastal bridge issues including wave loads on bridge decks; and coastal scour. The manual presents technical information and methods for assessing the vulnerability of coastal transportation facilities to extreme events with techniques to improve resilience. Some coastal transportation infrastructure is highly exposed to extreme events and that exposure will increase as sea levels rise. Many of the adaptations needed for future sea levels are the same engineering approaches needed for improving infrastructure resilience today.
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