Watch this drone from AeroVironment, which is moving its headquarters to Simi Valley.
Juan Carlo, VC Star
In the wake of such use against Ventura County’s Woolsey Fire, an arsenal of new technology is being put to the test fighting floods this year as rivers inundate towns and farm fields across the central United States.
Drones, supercomputers and sonar that scans deep underwater are helping to maintain flood-control projects and predict just where rivers will roar out of their banks.
Together, these tools are putting detailed information to use in real time, enabling emergency managers and people at risk to make decisions that can save lives and property, said Kristie Franz, associate professor of geological and atmospheric sciences at Iowa State University.
The cost of this technology is coming down even as disaster recovery becomes more expensive, so “anything we can do to reduce the costs of these floods and natural hazards is worth it,” she said. “Of course, loss of life, which you can’t put a dollar amount on, is certainly worth that, as well.”
Closer to home
Such technology was used in a disaster closer to home for Ventura County residents.
Simi Valley-based drone maker AeroVironment Inc. put its technology to work after the Woolsey Fire struck Ventura and Los Angeles counties in November.
Although AeroVironment primarily produces reconnaissance drones for the U.S. military, the company released Quantix, its first commercially available drone, last year. Designed for agricultural use, it ships with an Android tablet computer that works with the drone to produce high-resolution data and images of agricultural fields.
The National Park Service reached out to AeroVironment for assistance after the Woolsey Fire began to spread, eventually burning nearly 97,000 acres and destroying 1,643 homes and other buildings before it was contained Nov. 21.
The company used Quantix drones to analyze plant health to determine whether oak trees and vegetation in the fire’s path would survive. The National Park Service used the data provided by the drones to determine which vegetation areas would need to be restored.
AeroVironment’s services were invaluable during the Woolsey Fire as the company was able to quickly survey burned areas, Amanda Kaplan of the National Park Service said.
“AeroVironment donated its services to provide the imagery and the analytics platform that could quickly analyze the picture to help us quickly assess fire impacts,” Kaplan said in an email. “This was very important because a rainstorm was heading to the park that would likely wash away ash, making it much more difficult to measure impacts to the landscape, such as the mortality of oak trees.”
Much of the technology used against the flooding, such as the National Water Model , didn’t exist until recently. Fueled by supercomputers in Virginia and Florida, it came online about three years ago and expanded streamflow data by 700-fold, assembling data from 5 million river miles of rivers and streams nationwide, including many smaller ones in remote areas.
“Our models simulate exactly what happens when the rain falls on the Earth and whether it runs off or infiltrates,” said Ed Clark, director of the National Water Center in Tuscaloosa, Alabama, a flood forecasting hub. “And so the current conditions, whether that be snow pack or the soil moisture in the snow pack, well that’s something we can measure and monitor and know.”
Emergency managers and dam safety officials can see simulations of the consequences of floodwaters washing away a levee or crashing through a dam using technology developed at the University of Mississippi — a web-based system known as DSS-WISE . The software went online in 2017 and quickly provided simulations that informed the response to heavy rains that damaged spillways at the nation’s tallest dam in northern California. The program also helped forecast the flooding after Hurricane Harvey in Texas and Louisiana that year.
Engineers monitoring levees along the Mississippi River have been collecting and checking data using a geographic information system produced by Esri, said Nick Bidlack, levee safety program manager for the Memphis district of the U.S. Army Corps of Engineers. The company produces mapping tools such as an interactive site showing the nation’s largest rivers and their average monthly flow.
On the Mississippi River, flood inspectors use smartphones or tablets in the field to input data into map-driven forms for water levels and the locations of inoperable flood gates, seepages, sand boils or levee slides, which are cracks or ditches in the slopes of an earthen levee. Photos, videos and other data are sent to an emergency flood operation center in real time, allowing Corps officials to visualize any problems and their exact location, instantly informing the response, Bidlack said.
“If people in the field have concerns about something, they can let us know to go out there and look at it,” Bidlack said. “There’s a picture associated with it, a description of it, and it helps us take care of it.”
Corps engineers are increasingly flying drones to get their own aerial photography and video of flooded areas they can’t otherwise get to because of high water or rough terrain, said Edward Dean, a Corps engineer.
“We can reach areas that are unreachable,” Dean said.
The Corps also now uses high-definition sonar in its daily operations to survey the riverbed, pinpointing where maintenance work needs to be done, said Corps engineer Andy Simmerman. The Memphis district uses a 26-foot survey boat called the Tiger Shark, with a sonar head that looks like an old-fashioned vacuum cleaner and collects millions of points per square inch of data, Simmerman said.
The technology has helped them find cars and trucks that have been dumped into the river, along with weak spots in the levees.
“These areas are 20 to 80 feet underwater, we’d never get to see them without sonar,” Simmerman said. “The water never gets low enough for us to see a lot of these failures.”
During recent flooding near Cairo, Illinois, a culvert that should have been closed was sending water onto the dry side of a levee. The sonar pointed engineers to the precise location of a log that was stuck 20 feet deep in murky water, keeping the culvert open. Plastic sheathing and sandbags were brought in to stop the flow and save the land below.
“The sonar definitely made a difference,” said Simmerman. “A big success.”
From reports by Star staff writer Tyler Hersko and Adrian Sainz and Jeff Martin of The Associated Press
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