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"Probing the Depths of the Big Muddy," by Caroline Elliott

Download Transcript: http://kcdv.tv/big-muddy-speakers-ser... “Film & Discussion of the film, "Exxpedition - Making the Unseen Seen," by Caroline (Carrie) Elliott, geologist with U.S. Geological Survey – River Studies Branch Tuesday, April 25th, 2017 Drawing/Illustrations for Titles & Credits: "Tanning Sturgeon," by Tom Abellera, Kansas City, Missouri The Big Muddy is deep and mysterious. One can’t just look down and see what is on the bottom the way you can in a clear Ozark stream. Scientists from the US Geological Survey at the Columbia Environmental Research Center have developed a variety of tools to see through the murky river and watch what is happening on the bottom. They use precise measurements to watch and measure the migration of sand dunes and we can see details like rocky outcrops and large trees on the bottom of the river. Through the use of sonar they image fish like the pallid sturgeon as they swim upstream and even spawn in fast deep areas near the bottom of the river. USGS Geologist Caroline Elliott reveals what she’s learned about the hidden world of the bottom of the Missouri River, and share images of this murky and shifting environment. Caroline’s research is part of the Comprehensive Sturgeon Project. Her team is measuring bedload transport rates and mapping out the parts of the river that are moving and parts of the river channel that are stable. The research questions for pallid sturgeon recruitment and survival involve determining if the places where pallid sturgeon are currently spawning in the Missouri River are stable enough to support successful incubation of sturgeon embryos. When pallid sturgeon spawn they release eggs that adhere to rocky substrates in the river and scientists think these eggs require stable substrates for four to eight days before they hatch. Other questions related to bed and sand dune movement involve understanding how sturgeon move upstream through the river during their pre-spawning migrations and how drifting invertebrates many bottom-dwelling fish feed on move along the bed of the river. The USGS geomorphologists use sonar, specifically a multibeam echosounder and survey-grade GPS to map the bottom of the river. They use an acoustic Doppler current profiler to map velocity flow fields in the river channel and several types of sonar and underwater cameras to view fish and sediment in the river. They’ve made measurements at the bottom of the river in many places along the 811 miles of the Lower Missouri River downstream from Gavins Point Dam and on the Yellowstone River, a Missouri River tributary upstream in Montana and North Dakota. Videography by Kansas City Digital Video. Live broadcast of Big Muddy Speaker Series: http://www.kcdv.tv Index of the Big Muddy Speaker Series: http://www.kcdv.tv/big-muddy-speakers... For information about upcoming presentations visit: http://bigmuddyspeakers.org/kansascity/ Big Muddy Speakers Series (Kansas City) hosted by Healthy Rivers Partnership (http://www.healthyriverspartnership.c..., Lakeside Nature Center (http://www.lakesidenaturecenter.org/), and RiverRelief (http://www.riverrelief.org/) at the Westport Coffeehouse Theater (http://www.westportcoffeehouse.com)