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原文传递 Corps, USGS Deploy 800-Pound 'Dart' To Map Levees

题名：	Corps, USGS Deploy 800-Pound 'Dart' To Map Levees
正文语种：	eng
作者：	FRANK MCCORMACK
摘要：	Last summer, people living along the Mississippi River from its confluence with the Ohio all the way down to Baton Rouge, La., might have seen a strange sight: a helicopter with a giant red-tailed dart tethered beneath, flying along the river levee. No, it wasn't a mirage or performance art. Instead, it was an innovative tool the Vicksburg Engineer District and the U.S. Geological Survey (USGS) are using to scan and map beneath the surface of levees along the river. The dart, technically called a "frequency domain system," is paving the way for a first-of-its-kind regional geophysical survey of the Mississippi River's mainline levees. The device uses something akin to LiDAR technology to see the different soil layers down to about 150 feet below the surface. "Borings show us the general lay of the land under the surface, but using this technology is like getting an MRI on your brain," said Kent Parrish, project manag- er with the Vicksburg Engineer District. "It can tell me whether it senses silt, sand, clay or gravel and show me data between boring areas, like where the clay blanket might be too thin."
出版年：	2022
期刊名称：	The Waterways Jouranl
卷：	135
期：	43
页码：	6-6