Rising to meet the tide against the threat of coastal flooding

Flooding from Hurricane Sandy in 2012 (credit: Oliver Rich)

Christina Laughlin usually does whatever she can to avoid the flooding that plagues her neighborhood in Norfolk, Virginia, on the Chesapeake Bay. But on a blustery Sunday morning in October 2019, she donned a windbreaker and rain boots, grabbed her battered smartphone and deliberately headed straight to the high-water line.

Like her, hundreds of other locals were out and about that day, busy taking photos of the water and linking them to GPS markers during the year's highest astronomical tide, known as the king tide." Norfolk is one of several eastern US coastal cities with record rates of sea level rise, and scientists hope that the data collected by these citizen scientists can help hone the ability to forecast exactly when and where damaging floods will occur.

Low-lying mid-latitude cities like Norfolk are especially vulnerable, says geographer James Voogt of the University of Western Ontario, one of the authors of a 2020 article in the Annual Review of Environment and Resources on climate events in urban areas. You've got three things operating in the direction that increases the vulnerability of a city to flooding events," he says: sea level rise, increased chances of severe precipitation events, and an abundance of impervious surfaces that prevent water absorption and encourage runoff.

Read 25 remaining paragraphs | Comments