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Armed with a $7 million grant from the Army Corp of Engineers, University of Florida researchers are working to bolster shoreline resilience and restore troubled wetlands in St. Augustine through nature-based solutions.
“The idea of nature-based solutions is to build what we sometimes refer to as green infrastructure, to use living, natural components as the building blocks,” said Andrew Altieri, Ph.D., an assistant professor with the Engineering School of Sustainable Infrastructure & Environment and interim director of the Center for Coastal Solutions, also known as CCS. Instead of building man-made structures to protect wetlands, for example, restoration crews can move dredged natural sediment otherwise destined for costly disposal to increase wetlands’ size and elevation, restoring their ability to protect shorelines from storm surge, keep pace with sea-level change, filter toxins, store carbon and provide habitats for wildlife.
The project is in concert with the Army Corps of Engineers’ goal to naturally reuse and repurpose at least 70% of dredged sediment into other natural areas to benefit habitats and restoration by 2030.
“It is critical to understand, test and model how natural processes can be harnessed and strategically implemented to sustainably meet the challenge of rapidly intensifying coastal hazards while also providing environmental, economic and social benefits,” Altieri wrote in the project’s technical summary. Overall, the multi-disciplinary project closely examines patterns and processes of change in coastal landscapes. That includes wetlands — marshes and mangroves — and beach/dune systems.
The project comes as these coastal areas are facing threats both natural and human. These areas are essential to wildlife, air quality, native vegetation, storm protection and the overall health of the ecosystem. A 2008 study by the U.S. Fish and Wildlife Service reported a net loss of about 361,000 acres of wetlands in the coastal watersheds of the eastern United States between 1998 and 2004 — an average net decrease of 59,000 acres each year, with experts citing sea-level rise as one of the primary factors.
“We're trying to understand the patterns of that loss and what's leading to it,” Altieri said. “These systems are essentially the first and sometimes last line of defense against coastal hazards, risks that include storm surges and coastal flooding. They are forming a buffer, this kind of protective layer on our coast. But they're changing, generally for the worse and are in danger of being lost.” With this project, the CCS-led research team plans to advance the science, technology and engineering principles of nature-based solutions.
With marshes, the primary concern is elevation loss, which can drown the vegetation critical to the ecosystem. They are sinking, eroding and succumbing to sea-level changes, Altieri said.
“The plants are really important for trapping sediment and holding sediment,” he said. “You lose some of the plants, then you get more erosional loss and a lack of the accumulation of sediment.” Sediment is natural muck on the bottom of water bodies.
“If we can add sufficient sediment to increase the elevation to a level where the plants thrive, then they will retain that sediment that's been added to hopefully trap more sediment and accumulate more biomass through their growth,” Altieri said. “It’s something that may need to be done periodically. You may stop that decline, but you may even reverse the process of loss and change the trajectory.” As a bonus, this process saves the cost of disposing of dredged sediment, which is usually piped offshore or to a materials-management area.
This project is the next step for CCS-led coastal resilience efforts in St. Augustine. In 2024, CCS and WSP Environment & Infrastructure Inc. launched a coastal wetlands-restoration project to keep pace with sea level change and erosion. The 2025 work is a standalone project with separate funding, Altieri said.
The current project also has more research disciplines and project partners, including UF researchers from Landscape Architecture, Geological Sciences and the School of Forest, Fisheries and Geomatic Sciences.
“Storm surges, wave energy, coastal flooding – all of that can be slowed or reduced because of wetlands,” Altieri said. “They are basically like shock absorbers. These wetlands, beaches and dunes can be lost or eroded to some degree, but the upland area behind them is essentially protected.” Researching the resilience of dunes comes with a different set of dynamics. Here, they are looking at the plants that support the dunes – sea oats and panic grass, for example. That vegetation also provides a habitat for animals such as beach mice, turtles and birds.
On the beach, the team also is looking at water energy and how grain size affects the stability of dunes.
“It’s understanding water movement, water energy. How is that interacting with depositing sediment, moving sediment around, sorting sediment? With water, you tend to carry finer particles further than coarser materials,” he said. What does success look like after the award’s five years end?
“We'll have an understanding of what's changing on our coasts and why,” Altieri said. “We'll have an understanding of how we can work within this system to modify the natural components and utilize the natural processes. And we will hopefully be working with partners through additional funding mechanisms to actually apply that towards implementation of solutions to increase coastal resilience.” The team also includes Peter Adams, Department of Geological Sciences; Julie Bruck, Department of Landscape Architecture, School of Landscape Architecture and Planning; Maitane Olabarrieta, ESSIE; Alex Sheremet, ESSIE; Nina Stark, ESSIE; Ben Wilkinson, Geomatics Program, School of Forest, Fisheries, and Geomatics Sciences; and Xiao Yu, ESSIE.
A team of researchers, including Kevin Butler, Ph.D., a professor in the Department of Computer and Information Science and Engineering at the University of Florida, is sounding the alarm on a disturbing trend in artificial intelligence: the rapid rise of AI-generated sexually explicit images created without the subject’s consent.
With funding from the National Science Foundation, Butler and colleagues from UF, Georgetown University and the University of Washington investigated a growing class of tools that allow users to generate realistic nude images from uploaded photos — tools that require little skill, cost virtually nothing and are largely unregulated.
“Anybody can do this,” said Butler, director of the Florida Institute for Cybersecurity Research. “It’s done on the web, often anonymously, and there’s no meaningful enforcement of age or consent.” The team has coined the term SNEACI, short for synthetic non-consensual explicit AI-created imagery, to define this new category of abuse. The acronym, pronounced “sneaky,” highlights the secretive and deceptive nature of the practice. “SNEACI really typifies the fact that a lot of these are made without the knowledge of the potential victim and often in very sneaky ways,” said Patrick Traynor, a professor and associate chair of research in UF's Department of Computer and Information Science and Engineering and co-author of the paper. In their study, which will be presented at the upcoming USENIX Security Symposium this summer, the researchers conducted a systematic analysis of 20 AI “nudification” websites. These platforms allow users to upload an image, manipulate clothing, body shape and pose, and generate a sexually explicit photo — usually in seconds.
Unlike traditional tools like Photoshop, these AI services remove nearly all barriers to entry, Butler said.
“Photoshop requires skill, time and money,” he said. “These AI application websites are fast, cheap — from free to as little as six cents per image — and don’t require any expertise.” According to the team’s review, women are disproportionately targeted, but the technology can be used on anyone, including children. While the researchers did not test tools with images of minors due to legal and ethical constraints, they found “no technical safeguards preventing someone from doing so.”
Only seven of the 20 sites they examined included terms of service that require image subjects to be over 18, and even fewer enforced any kind of user age verification.
“Even when sites asked users to confirm they were over 18, there was no real validation,” Butler said. “It’s an unregulated environment.” The platforms operate with little transparency, using cryptocurrency for payments and hosting on mainstream cloud providers. Seven of the sites studied used Amazon Web Services, and 12 were supported by Cloudflare — legitimate services that inadvertently support these operations.
“There’s a misconception that this kind of content lives on the dark web,” Butler said. “In reality, many of these tools are hosted on reputable platforms.” Butler’s team also found little to no information about how the sites store or use the generated images.
“We couldn’t find out what the generators are doing with the images once they’re created” he said. “It doesn’t appear that any of this information is deleted.” High-profile cases have already brought attention to the issue. Celebrities such as Taylor Swift and Melania Trump have reportedly been victims of AI-generated non-consensual explicit images. Earlier this year, Trump voiced support for the Take It Down Act, which targets these types of abuses and was signed into law this week by President Donald Trump.
But the impact extends beyond the famous. Butler cited a case in South Florida where a city councilwoman stepped down after fake explicit images of her — created using AI — were circulated online.
“These images aren’t just created for amusement,” Butler said. “They’re used to embarrass, humiliate and even extort victims. The mental health toll can be devastating.” The researchers emphasized that the technology enabling these abuses was originally developed for beneficial purposes — such as enhancing computer vision or supporting academic research — and is often shared openly in the AI community.
“There’s an emerging conversation in the machine learning community about whether some of these tools should be restricted,” Butler said. “We need to rethink how open-source technologies are shared and used.” Butler said the published paper — authored by student Cassidy Gibson, who was advised by Butler and Traynor and received her doctorate degree this month — is just the first step in their deeper investigation into the world of AI-powered nudification tools and an extension of the work they are doing at the Center for Privacy and Security for Marginalized Populations, or PRISM, an NSF-funded center housed at the UF Herbert Wertheim College of Engineering.
Butler and Gibson recently met with U.S. Congresswoman Kat Cammack for a roundtable discussion on the growing spread of non-consensual imagery online. In a newsletter to constituents, Cammack, who serves on the House Energy and Commerce Committee, called the issue a major priority. She emphasized the need to understand how these images are created and their impact on the mental health of children, teens and adults, calling it “paramount to putting an end to this dangerous trend.”
"As lawmakers take a closer look at these technologies, we want to give them technical insights that can help shape smarter regulation and push for more accountability from those involved," said Butler. “Our goal is to use our skills as cybersecurity researchers to address real-world problems and help people.”
The slimy algae topping Florida’s waterways are more than just unsightly. They are often toxic to humans, animals and the environment.
To mitigate those risks, University of Florida researchers are collaborating with North Carolina State University and University of South Florida scientists on a next-day prediction model to warn and inform water managers about harmful algal blooms.
The research is funded by two U.S. Army Corps of Engineers grants for two phases, totaling $4.4 million. The project is led by David Kaplan, Ph.D., a professor with the Engineering School of Sustainable Infrastructure and Environment in the Herbert Wertheim College of Engineering and director of the Howard T. Odum Center for Wetlands, and Mauricio Arias, Ph.D., an associate professor at USF.
In a paper published recently in the Journal of Environmental Management, Kaplan, UF assistant professor Elise Morrison, Ph.D., and NCSU’s Maria Menchu Maldonado, Ph.D., chronicled their work with harmful algal blooms in the Caloosahatchee River and Estuary, the environmentally sensitive link between Lake Okeechobee and Florida’s southwestern coast. Maldonado performed the work under the guidance of NCSU collaborator Natalie Nelson.
In a collaboration between multiple colleges, organizations, departments and universities, the paper’s other authors are Eric Milbrandt of the Sanibel-Captiva Conservation Foundation, Edward Phlips of UF and Natalie G. Nelson of NCSU. The project’s facilitators include Darlene Velez, research coordinator with the UF Water Institute, and Lisa Krimsky, Ph.D., a water resources regional specialized agent with IFAS.
Using water samples and computer algorithms, the team developed prediction models based on two water sources feeding the river: Lake Okeechobee and the river’s watershed – the water run-off from the surrounding land. The models determine levels of chlorophyll-a, which is a pigment in algae that is indicative of algal bloom conditions.
“For watershed-dominated conditions, the model was able to predict 49% of the variation in next-day chlorophyll-a, which isn’t bad, but for lake-dominated conditions, the model was much better, explaining 78% of the variation in next-day chlorophyll-a in the water,” Kaplan noted. Unlike traditional forecasting models for algal blooms, which are often complex and require much computing power, these models are designed to be practical for daily decision-making, particularly for the Southwest Florida Water Management District (SWFWMD), which has made improving the health of the Caloosahatchee Estuary a state priority.
Ultimately, researchers want to develop an algae-prediction system and tools for water managers to reduce risks in all freshwater bodies.
“Definitely, this model could be expanded with the use of more data,” said Maldonado. “The same procedure could be applied in other lakes that are highly managed. And this could be done around the world.” Algal blooms in Florida’s lakes, rivers and estuaries have caused significant environmental and economic damage in recent years, UF researchers contend. Blooms are becoming more frequent and longer lasting.
The initial project – called Coupling Lake, Estuarine, and Watershed Models for the Caloosahatchee River and Estuary (CLEW) – designed data- and model-driven guidance for Lake Okeechobee water releases.
“The overall motivation is that Lake Okeechobee is a challenging natural resource to manage, particularly deciding when and how much water to discharge from the lake to either estuary,” Kaplan said. “There are many competing needs surrounding management of the lake, which has only so much volume. We don't want to cause flooding or other ecological harm.”
The follow-up project is UF’s collaboration with USF to develop tools for end users, meaning agencies and managers to make better decisions. The team wants to deliver a system where water managers press the button to get the one-day risk forecast.
The study was organized to predict whether the algae-toxin risk is low, medium or high.
“In this case, there is a threshold of algal organisms that is considered harmful,” Maldonado said. “Those waters carry phytoplankton species, a microscopic algae that produce toxins. They can be dangerous to swim in, and they can be harmful to the environment. It can be a liver toxin.” Beginning in the late 19th century, the Caloosahatchee River and its watershed underwent extensive modifications that significantly altered the hydrology of the region, according to SWFWMD. The once-shallow river was deepened and widened into a regulated waterway that was connected to Lake Okeechobee and the Kissimmee Chain of Lakes for navigation, water supply and flood control purposes.
“Water quality is a challenge in Lake Okeechobee, including sometimes pretty bad harmful algal blooms,” Kaplan said. “And then, of course, the downstream recipients of whatever water is discharged are very sensitive to the amount of water they're getting and what's in it. They’d prefer it to be only the right amount at only the right times with the best quality."
