Coastal & Marine Geology InfoBank

Home FACS Activities Atlas Geology School Related Sites More

USGS CMG InfoBank: Bed Load

Skip navigational links
Dictionaries: Our Mapping Systems   The USGS and Science Education   USGS Fact Sheets   Topics   Keywords   Data Dictionary   Metadata Dictionary   Computer Terminology   Digital Formats  
InfoBank Terms: Activity ID   activity overview   crew   digital data   formal metadata   lines   metadata   NGDC   port stops   project/theme   region   ship   stations   time   virtual globe   year  
Data Types: bathymetry   biological   geochemical   gravity   ground penetrating radar   imaging   LIDAR   logs   magnetics   metering equipment   navigation   samples   seismic   total station   definitions disclaimer  
Data Formats: ARC coverage   E00   FGDC metadata   gridded/image   imaging   material   scattered/swath   Shapefile   vector/polygon  
Comment: 22:44 - 24:06 (01:22)
Source: Annenberg/CPB Resources - Earth Revealed - 20. Running Water II: Landscape Evolution
Keywords: "Nancy Powell", "Old River", dam, "U.S. Army Corps of Engineers", "Old River Control Project", river, "Mississippi River", "Atchafalaya River", "bed load", flow-rate, "flow velocity", sediment, scouring, transportation

Our transcription: The effect on the Mississippi of the bed load remaining behind is a buildup of sediment in its channel.
So sediment flow, especially bed load as well as water flow, must be kept in check.
With this in mind, the Auxiliary Structure was strategically placed.
One of the goals of placing the Auxiliary Structure where it is to try to increase the amount of sediments being diverted from the Mississippi to the Atchafalaya.
One of the lessons we learned since the operation of the Low Sill Structure was that we were not diverting the same proportion of sediments through the Structure through Low Sill Structure, as we were water.
The Mississippi River was continuing to show evidence that it wanted to fill up, and the Atchafalaya was continuing to scour.
So we felt that if we increase the amount of sediments being diverted here at Old River that we would actually try to stabilize the Mississippi River and the Atchafalaya River, at least slow the trend down in the Atchafalaya.
So we located the Auxiliary Structure on the inside of a bend where there's actually more sediments.
And we angled it such that we would get the sediments moving along the bottom of the River.
These sediments would want to go into the inflow channel of the Auxiliary Structure and actually go through the Structure and on down to the Atchafalaya.

Geology School Keywords
Skip footer navigational links

Coastal and Marine Science Centers:  Pacific   St. Petersburg   Woods Hole  
InfoBank   Coastal and Marine Geology Program   Geologic Information   Ask-A-Geologist   USGS Disclaimer  

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: InfoBank staff
Page Last Modified: Thu Oct 31 04:28:11 PDT 2013  (chd)