Higher bridges, more frequent sand replenishment and even “coastal retreat” are among the ways to adapt to rising sea levels outlined in an updated report recently released by Carlsbad.
Coastal cities throughout California are looking at their vulnerability to rising seas. The information gathered will be included in each city’s “local coastal program,” which is a document approved by the state Coastal Commission to guide coastal development and maintain public access to beaches.
Narrower beaches, more flooding during storms and high tides, and increased erosion of coastal bluffs are among the most likely effects of sea-level rise identified in Carlsbad’s Sea Level Rise Vulnerability Assessment.
The city released its initial draft of the assessment in June 2016. The final draft, released in July after considering comments collected from two public meetings and offered by community groups, regulatory agencies and hundreds of residents, takes a closer look at the top strategies for adapting to the ocean’s changes, said Carl Stiehl, an associate planner for the city.
“There’s protection, like building walls or rock revetments,” Stiehl said. “There’s retreat, which is moving back from the coast over time, and adaptation, which is moving structures up.”
The new Interstate 5 bridges being built across the San Elijo and Batiquitos lagoons as part of an ongoing freeway widening project are good examples of adaptation by moving structures up, he said. Those bridges will be slightly higher and longer than the existing bridges to accommodate higher tides and stronger storms.
In Del Mar, another example is the…
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