Thursday, May 6, 2021

Fact Check

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US Politics
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Rerouting the Mississippi River could build new land—and save a retreating coast

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The state of Louisiana plans to divert sediment from the Mississippi River into Barataria Bay, creating an estimated 54 square kilometers of marshland over the next half-century.

Gerrit Vyn/NPL/Minden Pictures

In a swamp at the edge of Louisiana’s Barataria Bay, plastic-capped GPS antennas sprout like oversize mushrooms from four small wooden platforms. The gear, which helps scientists monitor changes in the surrounding marsh, is easy to miss in this expanse of water and swampland the size of Delaware. But it represents something even bigger: the beginnings of a grand ecosystem engineering experiment that has been 50 years in the making and could ultimately cost some $50 billion.

If all goes as planned, 2 years from now engineers will punch a massive hole in a nearby levee that holds back the Mississippi River. A 3.5-kilometer-long canal will carry sand and muck from the muddy river into the bay, helping rebuild vast wetlands eroded by sinking land and rising seas. Over 5 decades, researchers forecast that the project—formally known as the Mid-Barataria Sediment Diversion—could move enough sediment to bury the island of Manhattan under 3 meters of muck and create at least 54 square kilometers of new wetlands. The diversion, expected to cost $2 billion, is a critical part of a much larger effort aimed at preventing coastal Louisiana, and the human and wild communities it supports, from slipping beneath the sea.

“There’s nothing like [it] anywhere in the world,” says coastal geoscientist Torbjörn Törnqvist of Tulane University, one of a small army of researchers who have helped shape the project through years of fieldwork, computer models, and even the use of a giant replica of the Mississippi River in Massachusetts. “It’s going to be completely new.”

The project, which will be financed with money paid by oil giant BP after the 2010 Deepwater Horizon oil spill, last month reached a key regulatory milestone and could begin by 2023. But it is not universally loved. Fishers who make their living pulling oysters and shrimp from nearby waters fear the influx of freshwater could harm their livelihoods. Local officials are questioning the cost. And some scientists are skeptical it will achieve the desired results, given the complexity of trying to tinker with one of the world’s largest and most dynamic rivers.

But others are thrilled that the experiment may finally get underway, saying it could help heal the Louisiana coast and shape similar restoration projects elsewhere. “There’s no question that this is huge,” says John Lopez, a coastal scientist who was an early architect of coastwide restoration proposals for Louisiana and now runs a private consulting firm that advises environmental groups about the issue. He hopes it will become “a model for other areas in the world.”

From water, land

Researchers forecast that a $2 billion diversion project planned for the lower Mississippi River will build 54 square kilometers of new wetlands in Barataria Bay over a half-century.