Tag Archives: Rhode Island

Lessons Learned and Put to the Test at Rhode Island Refuge

When Hurricane Sandy hit the Rhode Island coast in late October 2012, Sachuest Point National Wildlife Refuge got hammered. Five years later to the day, the remnants of Tropical Storm Philippe struck New England, bringing strong winds and heavy rain. This time, the refuge was ready, thanks to work by the U. S. Fish and Wildlife Service and its partners.

The Wrath of Sandy

Hurricane Sandy brought heavy rain, wind gusts exceeding 80 miles per hour, and a storm surge boosted by a full moon to Sachuest Point. It wrought havoc on the refuge, chewing up pavement, strewing rocks and chunks of concrete onto the access road, and knocking down power poles. Maidford Marsh was flooded and its outlet to the Sakonnet River blocked by sand.

Restoring power to the visitor center took three months and re-opening the road another three, at a cost of $648 thousand. Thousands of would-be visitors were inconvenienced.

Hurricane Sandy caused severe damage to the access road at Sachuest Point. Credit: USFWS

Fortifying Infrastructure

Following Sandy, the Service worked with partners to repair and armor the access road, bury 7,000 feet of utility lines that run alongside it, and remove 60 utility poles. The work cost more than $1 million and was supported by Federal funding for Hurricane Sandy recovery and resilience projects and a generous $250,000 donation from local partners.

Mending the Marsh

The northern end of the marsh at Sachuest Point was modified dramatically in the early 20th century, when the Maidford River was rerouted and the Connector Road built from one side to the other. The southern end served as the dump for the Town of Middletown until 2004, when trash was removed and placed in a landfill to the west of the marsh.

With the marsh’s natural water movement, or hydrology, altered, the northern end was prone to flooding during heavy rain storms. After Sandy, it was inundated for an extended period, and the Connector Road was underwater.

In 2015, as part of another project supported by Hurricane Sandy funds, refuge staff created new channels in the marsh to improve its hydrology and drain storm water. When they realized more were needed, they contracted with the Woods Hole Group, in East Falmouth, Massachusetts, to study further the hydrology of the marsh. Another channel was added this fall, and staff will continue to assess the situation.

With support from a Hurricane Sandy Resilience grant from the National Fish and Wildlife Foundation, the Town of Middletown, Rhode Island, raised the Connector Road through the marsh to reduce its chances of being overtopped by floodwaters.

A Trial Run

This year’s storm was the result of bombogenesis, which happens when air pressure drops rapidly, intensifying the winds at the center of the storm. While not a hurricane, it brought heavy rain, high winds, and more power outages than Sandy. Due to the moon phase, tides were lower, reducing storm surge.

This time, there was no flooding and no loss of power at the refuge. The access road and visitor center remained open to the public. Cleanup amounted to closing lids on trash bins.

In the northern Maidford Marsh, stormwater drained through new channels and into the Sakonnet River without backing up. The Connector Road remained above water and open to traffic.

“We were hoping that the new channels would improve drainage, and this storm demonstrated that they have,” said Dr. Jennifer White, the Service’s Hurricane Sandy resiliency coordinator.

A #StrongerCoast

It’s hard to make a direct comparison between last month’s storm and Hurricane Sandy, but the conditions presented by the two are strikingly similar. While Sachuest Point experienced high winds and heavy rain during both, the damage to infrastructure and habitat was like night and day.

Knocked to its knees five years ago, the refuge returned stronger, meeting the recent challenge head-on and remaining up and running for wildlife and people.

A River Runs Free in Rhode Island

Not so long ago, mills were the lifeblood of their communities, harnessing the currents of the Northeast’s rivers to produce lumber, flour, and cotton and woolen goods. Rhode Island was home to many of the early textile mills that brought the Industrial Revolution to New England, with dozens of dams built in the Wood-Pawcatuck Watershed alone.

Only a few generations have passed since the mills were in use. But today many of these dams are no longer gateways to prosperity; they have aged into perilous barriers, blocking migratory fish runs and presenting potential liabilities to the communities they once served.

Suzanne Paton at WR copy

“We’re really trying to step back and look at a landscape scale,” says Service biologist Suzanne Paton. “Everything is connected.”

Supported in part by federal funding for Hurricane Sandy recovery, the U.S. Fish and Wildlife Service, The Nature Conservancy and other partners are removing these dams to restore a natural flow to the Pawcatuck River. Opening and connecting the river helps improve fish habitat and reduces the risk of flooding in towns along the river’s banks. It also helps enhance recreational opportunities like fishing and kayaking and supports local economies.

Follow the story of the river’s restoration as conservation leaders like Service biologist Suzanne Paton work to bring the Pawcatuck back to life.

 

A Bottom-up Boost for Coastal Habitat

Today we hear from Elizabeth Rogers, with the National Park Service at Fire Island National Seashore in New York State. Elizabeth spent some time this spring and summer working as a Public Affairs Specialist with the Fish and Wildlife Service, sharing the stories and science of resilient coastal communities and systems. On her days off, she can be found exploring the outdoors or dabbling in the kitchen.

The smell of the salt marsh can be overwhelming. Deep layers of mud dampened by the tides are rich in nutrients but low in oxygen. Bacteria within these layers feed on sulfate from seawater and produce the characteristic rotten-egg smell of the salt marsh. It is here, in the sometimes-smelly subsurface of the salt marsh, that Dr. Bart Wilson focuses his attention.

Salt marshes are considered “green” infrastructure. These natural habitats can help protect neighboring coastal communities by buffering against wind and waves and absorbing, then slowly releasing, floodwaters.

Salt marshes also provide habitat for fish, birds, and invertebrates and purify water by taking up nutrients that can be harmful in excess. According to Wilson, the U.S. Fish and Wildlife Service’s Northeast region coastal resiliency coordinator, marshes and the many benefits they provide are threatened by accelerated sea-level rise.

Salt marshes, like this one at Prime Hook National Wildlife Refuge in Delaware, offer habitat for fish and wildlife, while purifying water, absorbing floodwaters, and buffering wind and waves. Credit: USFWS

“Marsh elevation builds naturally from the bottom up,” says Wilson. “Organic material, like the roots of saltmarsh grasses, gives the surface a lift.”

To the plants and animals in tidal marshes, elevation is everything. Higher ground is home to plants and animals adapted to survive occasional flooding, and species that can withstand daily flooding by high tide live at lower elevations within the marsh. Smooth cordgrass (Spartina alterniflora) is salt-tolerant and typically grows where high marsh and low marsh meet, near the mean-high-water mark.

In addition to the bottom-up boost from below-ground plant roots, marsh elevation can slowly increase as sediments accumulate at the surface. Sediment may come from a nearby creek or river, or from the adjacent marine environment. Salt marshes tend to thrive in locations where these elevation gains are in a natural balance with elevation losses due to sea-level rise, erosion, and subsidence (the natural, gradual sinking of a land mass).

In many salt marshes, elevation loss has been outpacing elevation gain, threatening the survival of these systems. In response to this trend, nearly three decades ago, scientists began looking for a way to give salt marshes a lift.

According to Wilson, dredging sediment from nearby rivers or other waterways and spreading it onto high marsh free of vegetation builds “elevation capital.” The technique, called thin-layer deposition or TLD, helps salt marshes better withstand sea-level rise and subsidence. In some cases — where ditches or channels have been dug and have altered the way water naturally moves through the marsh, where upstream dams starve a salt marsh of sediment, or where infrastructure impedes the natural shoreward migration of marshes — restoration methods like TLD may be a way to maintain these ecosystems and preserve their many benefits.

The saltmarsh sparrow, whose numbers are declining, is one of many species that depend upon salt marsh habitat for survival. Credit: K. Papanastassiou

The Service first tested TLD in the Northeast in 2003 at Blackwater National Wildlife Refuge in Maryland. This small demonstration project succeeded but left managers and scientists with more questions, including how to decrease costs while maximizing results.

In 2013, dredge material was used for the first time by the State of Delaware to restore a marsh at Pepper Creek. Not only did this effort help land managers better understand the amount of material needed to build maximum resiliency, it also demonstrated the practicality of reusing sediment from nearby dredge sites.

Following Hurricane Sandy in 2012, federal funding for recovery and resiliency offered the opportunity to begin to answer those questions. Sandy funds are supporting five TLD projects at four national wildlife refuges in the Northeast.

For Wilson, these restoration projects go beyond just testing the technique. TLD projects, he says, are about, “conserving bird, fish, invertebrate and mammal habitat; enhancing flood attenuation, carbon sequestration, and nutrient uptake; and, protecting roads, houses, and waterways.”

By restoring elevation, TLD is helping restore natural marsh function, and the multiple benefits of this gorgeous green infrastructure lining our coasts.

A small-scale study with big impact at Blackwater Refuge

For thousands of years, tidal marshes have “kept their heads above water by building up roots below the surface,” says Blackwater National Wildlife Refuge Supervisory Biologist Matt Whitbeck. Only recently has the natural ability of these systems to grow vertically not been enough. As a result, says Whitbeck, “the marsh is essentially sinking.”

The Blackwater Marsh is unique in that the causes of its decline have been well-studied. Until the Chesapeake Bay Nutria Eradication Project began in 2002, nutria, root-loving rodents introduced to the United States in the nineteenth century, hindered natural marsh build-up. Since then, erosion from storm waves and subsidence have been the primary causes of marsh loss.

This historic perspective, and information collected by scientists over the years, helped Whitbeck strategically select 40 of Blackwater Refuge’s 28,000 acres of salt marsh for a Sandy-funded TLD project managed by the Conservation Fund.

To the casual observer, the project site looks as lush and green as any other on the marsh. But Whitbeck, who has spent more than nine years monitoring the marsh, says this project was a much-needed boost for marsh threatened by rising seas and more frequent powerful storms.

“Because we knew this area was losing elevation faster than elsewhere on the marsh, we could work to protect it.” And safeguarding this relatively small site helps protect a swath of salt marsh that supports one of the densest populations of bald eagles on the East Coast.

Partnering for the future at Forsythe Refuge

Restoring marsh elevation requires resources. Securing funds, permits, and a sediment source can be a major challenge for land managers. At Edwin B. Forsythe National Wildlife Refuge in New Jersey, the Service is solving this problem by partnering with federal, state, and local agencies on three TLD projects.

Though the first project is still in the design phase, Edwin B. Forsythe National Wildlife Refuge stands to benefit from a New Jersey Department of Transportation channel-dredging project that will supply sediment for nearly 70 acres of degraded salt marsh. An environmental assessment of the project was completed in the fall of 2016 and will guide implementation, ensuring channel sediment is placed on the marsh when it is least likely to affect fish and wildlife.

This salt marsh at Edwin B. Forsythe National Wildlife Refuge in New Jersey will be restored using thin-layer deposition. Credit: USFWS

The goal of the project is to “re-establish an optimum elevation for salt marsh plant growth,” says Amy Drohan, a Service biologist and lead on the project. As a bonus, Drohan says pulling the permits and plans together for this project will help speed the process in the future.

Recycling sediment to protect marshes at Rhode Island Refuges

The Service’s Hurricane Sandy resiliency coordinator, Dr. Jen White, has managed two TLD projects in Rhode Island since the storm hit in 2012. A focus of these projects has been to work with partners like The Nature Conservancy and Save the Bay to make use of available sediment to restore marsh habitat and function.

TLD, or “elevation enhancement,” as White prefers to call it, is considered a “beneficial reuse” of dredge or construction sediment. Material that would otherwise be disposed of at upland or offshore sites can instead be used to build up degraded salt marsh sites.

Elevation enhancement treatments were carried out at two Rhode Island refuges, where sediment placement helped restore saltmarsh sparrow habitat. “This is really new to Rhode Island,” said White, who is hopeful that understanding how these restoration projects perform will help the Service protect salt marshes for years to come.

Seeing how the marsh responds to restoration treatments will take time White says, but community interest was immediately apparent. Neighbors have been interested in the work and its benefits to coastal communities. Some have even offered to pitch in by planting vegetation at newly restored sites.

Though project sites can sometimes look like a sandy beach, many lie within marshes and require nimble footwork to avoid ditches and pools.

“Getting volunteers out to some of the elevation enhancement project sites can be an adventure,” says Wenley Ferguson, director of habitat restoration at Save the Bay. “But by the end of the day, they look forward to returning to see how their work helps protect this habitat.”

Nature has shaped salt marshes for thousands of years, building resilient natural systems that serve as an important stopover site for migratory shorebirds, critical nesting habitat for vulnerable species like the saltmarsh sparrow, and nursery grounds for valuable fish and shellfish. This productive habitat naturally provides additional benefits for people, like water purification, nutrient cycling, and flood protection.

Restoration techniques like TLD are giving salt marshes a fighting chance against sea-level rise and subsidence. And Hurricane Sandy Relief Aid gave the Service an opportunity to apply and study this technique.

With an improved understanding of TLD and help from partners, the Service can continue to work to ensure that salt marshes are healthy, sustaining species and making coastal communities more resilient to future storms.