Hurricane Sandy's Coastal Legacy Lidar Revealed

Press Release
Tuesday, November 27, 2012

Lidar confirms Sandy’s dramatic coastal change Impacts and future coastal vulnerability to US Geological Survey.

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 Bay Park, 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.


 

Maritime Reporter October 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Technology

Rolls-Royce Bags £12 mi Order from Myklebusthaug Management

Rolls-Royce has won a £12 million order to provide design, integrated power and propulsion systems and equipment for a highly advanced multipurpose service vessel

DNV GL “Modification Excellence Award” for Schiffahrt

Classification society DNV GL recognised that E.R. Schiffahrt has retrofitted seven ultra large container vessels to meet the highest energy efficiency standards

Kleven Wins New Yacht Contract

Norwegian ship builder Kleven has secured a new contract for a high specification, 116-metre long Expedition Support Vessel. The order is placed by Mr Graeme Hart,

Marine Science

Rolls-Royce Bags £12 mi Order from Myklebusthaug Management

Rolls-Royce has won a £12 million order to provide design, integrated power and propulsion systems and equipment for a highly advanced multipurpose service vessel

DNV GL “Modification Excellence Award” for Schiffahrt

Classification society DNV GL recognised that E.R. Schiffahrt has retrofitted seven ultra large container vessels to meet the highest energy efficiency standards

Wärtsilä Integrated Solutions for Maersk's AHTS Vessels

A new series of six Anchor Handling Tug Supply vessels to be built at the Kleven Verft AS in Norway for the Danish based Maersk Supply Service A/S - part of the A.

 
 
Maritime Careers / Shipboard Positions Maritime Security Naval Architecture Navigation Pipelines Salvage Ship Electronics Ship Repair Ship Simulators Winch
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.0838 sec (12 req/sec)