The National Aquarium’s new Harbor Wetland shows the great potential of creating wildlife habitat in cities. With just 10,000 square feet, it has already drawn otters, herons, ducks, crabs, fish, eels, and jellyfish.
The $14 million constructed wetland in Baltimore, Maryland was designed by landscape architects at Ayers Saint Gross, a multidisciplinary firm. It improves the harbor environment and advances research and innovation. It’s also a free educational landscape that inspires the public to reconnect with nature.
“Harbor Wetland is an example of how to marry science and art,” said Amelle Schultz, ASLA, PLA, a principal and landscape architect with Ayers Saint Gross. “It leaves no doubt that landscape architecture is a STEM discipline.”
Schultz said the floating wetland may look simple but in reality it’s a complex work of design and engineering. “Only about one-third of the project is visible; two-thirds is below the surface.”
The wetland has many layers. More than 32,000 native tidal marsh shrubs and grasses form the top. They were planted in recycled plastic matting that will allow the plant roots to grow down into the water, providing habitat for dozens of species and filtering harbor water.
Amid these plants are shallow channels, with beds of oyster shells that provide additional habitat. Compressed air is pumped into these channels, bringing dissolved oxygen into the harbor and keeping water circulating, like in a natural tidal marsh.
This entire system sits on top of another layer of custom pontoons. Their buoyancy is adjusted as the weight of the wetland increases with plant growth. The pontoons also support the walkways and outdoor classroom spaces that line the installation. “Traditional constructed wetlands eventually sink under their weight — this one won’t,” Schultz said.
Sitting at the end of the classroom space, hundreds of feet into the harbor, there is a moment of serenity. It’s easy to forget about all the engineering and technology and just imagine you are in a natural wetland.
And the project also makes it easy to imagine more wetlands. The project supports the aquarium’s long-term ecological research and will inform the creation of future constructed wetlands. The system is designed to help make the case: Sensors embedded in the wetland test the water quality, and researchers are documenting species populations.
Schultz thinks one measure of the project’s success is the incredible range of species that now visit. “The aquarium’s interior exhibitions are built to be natural, but the animals can’t leave. The animals that visit the wetland choose to be here,” she said. Some of the species that visit were a surprise: “American eels are really hard to find in the harbor.”
The grasses are important habitat for many species the aquarium wants to track. As they were growing in, the aquarium even added a plastic coyote to scare off geese, which would have made a meal of them. “It’s more of a joke now than a deterrent,” said Shelley Johnson, ASLA, PLA, senior associate with Ayers Saint Gross.
Harbor Wetland also builds on research conducted on a smaller prototype just a few feet away in the same bulkhead, which was initiated more than 10 years ago. Ayers Saint Gross worked with Biohabitats, McLaren Engineering Group, and Kovacs, Whitney & Associates to advance an initial concept created by Studio Gang.
“Even in the prototype, the aquarium team saw small fish come to the small stream in the middle of the wetland. No one expected that to happen,” Schultz said.
The aquarium thinks Harbor Wetland will boost the local economy. “The wetland will bring more people to the inner harbor,” Johnson said. “Not everyone can afford tickets to the aquarium, but they can visit this.”
School groups are already visiting, where they are given tours by aquarium researchers. The mural that frames the project expresses the aquarium’s hope that more young people in Baltimore will be inspired to join the effort to restore the Chesapeake Bay.
“Landscape architects led the team to the solution — the technical and scientific aspects, and married that to the public realm,” Schultz said.
The technical work alone realized benefits: their innovations led to a new patent application focused on the integrated buoyancy and aeration system.