The Center Groin Plum Island

Slide 1: 

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The Center Groin : 

The Center Groin

Groins act as dams that slow or halt migrating sand. They will hold sand above water, as well as underwater in the near shore shallows… : 

Groins act as dams that slow or halt migrating sand. They will hold sand above water, as well as underwater in the near shore shallows… Source: Project Oceanica, College of Charleston Dept of Geology & Environmental GeoSciences 1. 2. 3. 4. 5.

Slide 4: 

In August of 2008, a large column of sand was streaming north from the Wildlife Refuge. But there was a Major obstacle.

Slide 5: 

At the largest & most intact groin on Plum Island, the Center Groin, the shoreline abruptly changes… Sand traveling North stops & gathers on the south side, while Sand Erosion occurs in the shadow of the groin… Groin Halts Sand Sand Piles Up Sand Continues To Migrate Away Sand Migration August 28, 2008

Slide 6: 

Nature forces sand through the groin Migrating Sand Topples Rocks To the North

Given how groins trap sand, were the sand indeed flowing south,there wouldn’t be an erosional void on the North side of the Center Groin… : 

Given how groins trap sand, were the sand indeed flowing south,there wouldn’t be an erosional void on the North side of the Center Groin… Rather, like an open catcher’s mitt, it would fill up with sand.

Slide 8: 

When these two sources of sand meet & interact, the center’s void will fill with sand.