Mighty Mississippi: Scientists use model in land loss fight

phys.org | 4/17/2018 | Staff
marika (Posted by) Level 3
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Scientists working on new ways to battle the erosion that threatens Louisiana's coastline have a dramatic new tool: a massive replica of the lower Mississippi River.

The Louisiana State University's Center for River Studies is home to the newly opened Lower Mississippi River Physical Model, a 10,000-square-foot (930-square-meter) reproduction of nearly 200 miles (322 kilometers) of the lower Mississippi from the town of Donaldsonville northwest of New Orleans to the Gulf of Mexico. The model will help experts study one of the most important rivers in North America and how sediment from it can be used to fight coastal erosion.

Flows - Water - Stages - Water - Levels

"Not only can we model the flows and the water stages of the water levels in the Mississippi River, we can also model or simulate the transport or the movement of the Mississippi River sand down the river, and we can do all that in roughly one hour to replicate one year on the river," said Clint Willson, the LSU professor who heads the Center for River Studies.

Louisiana is in a race to protect and rebuild its fragile coastline from decades of erosion while also facing rising seas from climate change. It's estimated to have lost 2,000 square miles (5,180 square kilometers) of coastline since the 1930s, according to Rudy Simoneaux of the state's Coastal Protection and Restoration Authority. That's about the size of Delaware.

Louisiana - Plan - Part - Channels - Diversions

To fight back, Louisiana developed a plan that relies in part on slicing channels or diversions at various locations into the levees that keep the Mississippi River in its course and letting some of the sediment in the river into the rapidly eroding wetlands to rebuild land. The idea, said Simoneaux, is to "put the river back to work to rebuild what it once built on its own."

The Delta region of southeastern Louisiana was built over centuries on...
(Excerpt) Read more at: phys.org
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