Everglades restoration must deal with rising ocean, new report says

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Are we restoring the Everglades just so the ocean can swallow a lot of it back up? Eighteen years into the multibillion-dollar restoration of the Everglades, a scientific review committee called Wednesday for a broad re-examination of future projects in light of the changing climate and rising oceans.

The National Academies of Sciences, which issues a report to Congress every year on the progress of the massive project to restore South Florida's shrunken wilderness, said conditions have changed since the Everglades restoration was planned in the 1990s.

"There is now ample evidence that the South Florida climate is changing," stated the latest report. "There is general consensus that temperatures will increase over time, although considerable uncertainty about future rainfall patterns remains. There is also compelling recent evidence that sea-level rise is accelerating. These changes will have profound impacts on the South Florida ecosystem and the related challenges of providing flood protection and meeting future water and recreational demands."

The restoration of the Everglades is a joint federal and state project to revive what's left of the River of Grass, filling in canals, removing levees, finding ways to store fresh water and taking other steps to undo some of the damage done over the past century to accommodate farms and cities.

Now, the report says, the accelerating rise of the ocean is striking another blow at the Everglades, although projects in the restoration plan could mitigate the damage.

Ocean water, for example, has already intruded on the edges of the Everglades, causing the collapse of the thick that underlies its fields of sawgrass. Once the soil collapses, thick stands of sawgrass are replaced by ponds of open water. But more fresh water, which the Everglades restoration is designed to provide, can shore up the peat soil, helping it withstand the attack from the ocean.

"The restoration efforts are likely to have noteworthy benefits that increase the resilience of the ecosystem in the face of climate change, but these benefits have not yet been adequately studied or quantified," said Bill Boggess, professor of applied economics at Oregon State University and chairman of the committee that wrote the report, in a news release. "With seven large projects to be constructed and three more nearing the end of their planning process, this is the opportune time for a mid-course assessment."

The report made several other observations about the progress of the restoration work, some favorable, some not.

- "Impressive advances" have been made on quality, particularly with reductions of phosphorus. An important plant nutrient that has washed off farms for decades, phosphorus must be limited in the Everglades to prevent non-Everglades plants from crowding out sawgrass.

- There has been progress is doing work at the ground level, with the completion of two projects to deliver more to Everglades National Park.

- Funding remains slow. If average funding levels for the past five years persisted, it would take 65 years to complete the work. "At this pace of restoration," the report said, "it is even more imperative that agencies anticipate and design for the Everglades of the future."
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Citation: Everglades restoration must deal with rising ocean, new report says (2018, October 18) retrieved 25 April 2019 from https://phys.org/news/2018-10-everglades-ocean.html
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