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St. Petersburg Coastal and Marine Science Center

St. Petersburg Coastal and Marine Science Center > Coastal Change Hazards: Hurricanes and Extreme Storms > Hurricane Katrina

Coastal Change Hazards: Hurricanes and Extreme Storms

Dauphin Island

Hurricane Katrina

Before and After Photo Comparisons: Dauphin Island

Dauphin Island is located directly south of Mobile, Alabama, more than 110 kilometers east of the region where the eye of Katrina came ashore in Plaquemines Parish, LA. The island suffered extensive overwash, and a major breach was formed toward the western end of the island (not shown). Below, photo triplets show the changes that have occurred in the recent hurricane seasons to a developed section of the island. The time period covers Hurricanes Lili (2002), Ivan (2004), Dennis (2005), and Katrina (2005). The first image in each triplet was taken in July 2001, before Hurricane Lili (2002). The second photograph was taken on September 17, 2004, immediately after the passage of Hurricane Ivan. The third image in each triplet was acquired on August 31, 2005, two days after Hurricane Katrina. All triplets show that the changes due to Hurricane Dennis (2005) and Hurricane Katrina are much greater than the changes from Hurricanes Lili and Ivan.

Photo showing locations of pre-and post-storm photo sets
Photo showing locations of pre-and post-storm photo sets. Scroll down or click on the yellow location numbers on the photo above to view the pre- and post-storm photo sets for Dauphin Island.

These photographs show overwash deposits extending roughly half way across the island after Ivan, while the post-Katrina photography shows overwash sand extending nearly the entire island width
Location 1: The top image was taken in July 2001, before Hurricane Lili (2002). The middle photograph was taken on September 17, 2004, immediately after the passage of Hurricane Ivan. The bottom image was acquired on August 31, 2005, two days after Hurricane Katrina. These photographs show overwash deposits extending roughly half way across the island after Ivan, while the post-Katrina photography shows overwash sand extending nearly the entire island width. [larger version]

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 The post-Ivan photo shows overwash deposits covering the road and encroaching on the first canal. The post-Katrina photograph shows the overwash deposit has not only covered the road, but filled the first canal and is encroaching on the second canal.
Location 2: The top image was taken in July 2001, before Hurricane Lili (2002). The middle photograph was taken on September 17, 2004, immediately after the passage of Hurricane Ivan. The bottom image was acquired on August 31, 2005, two days after Hurricane Katrina. Note the road and two parallel canals in the first photograph. The post-Ivan photo shows overwash deposits covering the road and encroaching on the first canal. The post-Katrina photograph shows the overwash deposit has not only covered the road, but filled the first canal and is encroaching on the second canal. The beach appears brown in the bottom photograph due to a "deposit" of plant debris. [larger version]

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These photographs show a significant increase in overwash penetration across the island after Ivan and beyond the island after Katrina.
Location 3: The top image was taken in July 2001, before Hurricane Lili (2002). The middle photograph was taken on September 17, 2004, immediately after the passage of Hurricane Ivan. The bottom image was acquired on August 31, 2005, two days after Hurricane Katrina. These photographs show a significant increase in overwash penetration across the island after Ivan and beyond the island after Katrina. The structure in the lower left corner is an oil rig that broke loose during Katrina and washed ashore. The beach appears brown in the bottom photograph due to a "deposit" of plant debris. [larger version]

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St. Petersburg Coastal and Marine Science Center > Coastal Change Hazards: Hurricanes and Extreme Storms > Hurricane Katrina

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