University of Miami

Measuring the size of a Tsunami

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How big was the size of the tsunami that hit Tonga last year? A new study led by scientists at the University of Miami and the Khaled bin Sultan Living Oceans Foundation measured the size of the Tongan tsunami and found that it was similar in size to the one caused by the eruption of Krakatoa in 1883.

The 2022 eruption of a submarine volcano in Tonga was more powerful than the largest U.S. nuclear explosion, according to a new study led by scientists at the University of Miami Rosenstiel School of Marine, Atmospheric, and Earth Science and the Khaled bin Sultan Living Oceans Foundation.  

The 15-megaton volcanic explosion from Hunga Tonga-Hunga Ha’apai, one of the largest natural explosions in more than a century, generated a mega-tsunami with waves up to 45-meters high (148 feet) along the coast of Tonga’s Tofua Island and waves up to 17 meters (56 feet) on Tongatapu, the country’s most populated island.

In a new analysis in Science Advances, researchers used a combination of before-and-after satellite imagery, drone mapping, field observations collected by scientists at The University of Auckland, and high-resolution bathymetric maps from the Khaled bin Sultan Living Oceans Foundation’s Global Reef Expedition, to produce a tsunami simulation of the Tongan Archipelago. The results showed how the complex shallow bathymetry in the region acted as a low-velocity wave trap, capturing a more than hour-long tsunami with waves up to 85 meters (279 feet) high one minute after the initial explosion.

Little Creatures with a Big Message: An Educator’s Guide

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Lately, you have been hearing from our partners at the University of Miami (UM) about their experiences processing and picking tiny foraminifera from sand samples that we collected on the Global Reef Expedition (GRE). As our colleagues continue to process the large quantity (2,500) of sand samples, we are creating an educator’s guide called “Little Creatures with a Big Message.”

Together, the University of Miami and the Khaled bin Sultan Living Oceans Foundation received a three-year grant from the National Science Foundation (NSF) to utilize microscopic organisms, called foraminifera (‘forams’ for short), to assess the state of coral reefs over the past 1,000 years, and potentially create new metrics that can be used to assess reef health.

NSF recognizes that a critical component to any research project is how it can benefit society. This is what NSF defines as the “Broader Impacts.” As a part of this grant, we will deliver on the broader impacts portion of the grant to educate and communicate this science to others. One of the ways will do this is by creating curriculum that improves STEM (science, technology, engineering, and math) education and increases participation of minorities in STEM.

Measuring reef health from space

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With compelling evidence that we have lost half of the world’s tropical coral reefs over the last few decades, there is an urgent need to understand their overall health. Without this basic information to use as a baseline, it is near impossible to mount a response to the so-called global reef crisis. The most straightforward method we have for monitoring reefs is conducting SCUBA diver surveys. However, this type of field work is logistically and financially challenging to execute on large scales, so developing a new method to monitor reefs remotely is key.

In attempt to find a solution, Anna Bakker combines the fields of remote sensing, computer science, and ecology to measure reef health from space. Recently, Anna published a paper in Coral Reefs, which utilized the Living Oceans Foundation’s Global Reef Expedition field dataset to build a model that can predict coral cover and other metrics of coral reef health using open-source satellite data.

Surveying the Reefs of Lana’i – by Air and by Sea

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As the sun begins to rise over the island ridges of Lana’i, Hawai’i, the drone lifts off from its landing pad on the beach and begins to fly a grid along the coast, imaging the nearshore coral reefs. The drone is being flown by Dr. Ved Chirayath from the University of Miami Rosenstiel School of Marine, Atmospheric, and Earth Science’s Aircraft Center for Earth Studies (ACES). Ved has pioneered a new approach to mapping reefs using drones equipped with fluid lensing technology. While this cutting-edge technology is capturing reefs by air, the need for in-water validation of those images and census of marine life is critical to understanding the status of this coral reef ecosystem. And that is where my expertise comes into play.

I have been surveying reefs all over the world for the past 10 years, and I am excited to be putting my skill set to use again in the field. Traditional underwater surveys of both the benthic and fish communities, combined with drone surveys, gives the most detailed information regarding the health of the coral reef ecosystem…

Surveying Coral Reefs in Hawaii with ACES

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Earlier this year, the Khaled bin Sultan Living Oceans Foundation joined Dr. Ved Chirayath on a research mission to survey and map coral reefs in Lana’i, Hawaii. Chirayath leads the University of Miami’s Rosenstiel School of Marine, Atmospheric, and Earth Science’s Aircraft Center for Earth Studies (ACES), and has pioneered a new approach to mapping reefs using drones equipped with fluid lensing technology.

Fluid lensing harnesses the unique power of waves to magnify and concentrate light on the seafloor, essentially allowing users to see through the water and map the seafloor in stunning detail…

Shark tagging with our partners, Black Girls Dive Foundation

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“There’s a shark on the line!” The young ladies from Black Girls Dive Foundation (BGDF) squirmed with anticipation and giggled with excitement. As their chaperone, I could feel my own adrenaline surging as we watched the University of Miami (UM) team scurrying around at the back of the boat. The chaperones fitted the first four students with gloves and life vests. Then the students lined up in single file to begin their assigned individual and group tasks. It was time to get to work.

In December, I had the honor of being asked to join our partners at Black Girls Dive Foundation on a shark tagging expedition with the UM Professor Neil Hammerschlag’s Shark Research and Conservation team at Rosenstiel School of Marine and Atmosphere Science. The trip is part of BGDF’s Science, Technology, Robotics, Engineering, Arts and Mathematics with SCUBA (STREAMS) program, which is designed to introduce black girls between the ages of 9 and 17 to a multitude of activities. The Shark Research and Conservation Capstone is a component of the STREAMS program that teaches about the behavioral ecology and conservation of sharks. After completing a series of lecture and lab activities, this part of the program culminates with a field-intensive research expedition: shark tagging.

Coral Reef Educator on the Water (CREW)

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The CREW program offers high school teachers the opportunity to join the Global Reef Expedition (GRE) on one of its missions. Participants gain first-hand experience of life on board a working scientific research vessel, a greater understanding of the importance …