Directions Magazine
Hello. Login | Register

Press Releases

Home | Submit Press Release

Lidar Confirms Sandy’s Dramatic Coastal Change Impacts and Future Coastal Vulnerability

Bookmark and Share
Monday, November 26th 2012
U.S. Geological Survey | Reston, VA


Posted: 26 Nov 2012 06:31 AM PST

ST. PETERSURG, Fla. –The extent of Hurricane Sandy's wrath -- and the future coastal vulnerability of the region -- is clear in a new U.S. Geological Survey analysis of recently collected lidar coastal data. The research documented particularly dramatic impacts within the Fire Island National Seashore on Long Island, NY.

Lidar, or light detection and ranging, uses lasers to measure elevations in a specific distance/area. Researchers used the lidar data, collected during an airborne survey, to construct a high-resolution three-dimensional map of before- and after-storm conditions. 

This information can help scientists and decision-makers identify the areas along the shore that have been made more vulnerable to future coastal hazards in the storm’s wake.

"Coastal dunes are our last line of natural defense from the onslaught of storms and rising seas," said USGS Director Marcia McNutt. "They are dynamic features that retreat from the battering of major storms like Sandy and rebuild in the aftermath; their natural cycle is inconsistent with immobile development."

USGS research oceanographer Hilary Stockdon said that the lidar data show that at Ocean Beach, for example, storm surge and waves associated with Sandy demolished protective dunes – and the structures built on top of them.

"In the pre-storm elevation image of Ocean Beach, you can see houses that are sitting right on the sand dune," Stockdon said. "But in the post-storm elevation image, the high dune elevation is gone. The dune and the houses on it were completely washed away."

The pre- and post-storm ground conditions at Fire Island were similarly dramatic, USGS coastal geologist Cheryl Hapke said, noting that the USGS worked closely with the National Park Service to gather field data on the island.

"We found that there was widespread dune erosion and overwash," Hapke said. "On average, where the dunes were not completely overwashed, they eroded back 70 feet -- the equivalent of 30 years of change. Our research also showed that dunes lost as much as 15 feet of elevation."

The lidar analysis, said Stockdon and Hapke, combined with ground survey data, and pre- and post-storm oblique aerial photography, tell a dramatic story of Sandy’s catastrophic effect on the shoreline – and future coastal vulnerability – in this region. It will also help to demonstrate the accuracy of coastal change predictions calculated before the storm in this area.

"This work can help coastal communities understand where they are most vulnerable to future storms," Stockdon said "and help decision makers at all levels create policies that protect their economic, environmental, and ecological health in the coastal areas most susceptible to extreme storm impacts."

Bookmark and Share

Stay Connected

Twitter RSS Facebook LinkedIn Delicious Apple Devices Android Blackberry






Recent Comments

Microsoft Back in the Geo Game?

Microsoft seems to be finally making waves in geo: Bing Maps Favelas; Azure Search; Power BI Visualization. Does all this point to a renewed focus on geospatial for consumer and enterprise?

Study shows Where on the Planet new Roads Should and Should not Go
NOAA analysis Reveals Significant Land Cover Changes in U.S. Coastal Regions
Landsat and Water: Using Space to Advance Resource Solutions
Thinking Inside the Box - Leveraging Audience Data for Optimal Mobile Marketing Performance
Enhanced Elevation Data to Sharpen Global Focus on Climate Issues
Every GIS Student’s Nightmare: Finding a Research Topic
Crime Data Analysis Using MapInfo: A Tutorial
Mapping Could help stop Ebola’s Spread

DirectionsMag.com

About Us | Advertise | Contact Us | Web Terms & Conditions | Privacy Policy
© 2014 Directions Media. All Rights Reserved