1 / 27

A Field Trip to the Congo-- Hydroacoustic measurements in "the river that swallows all rivers"

A Field Trip to the Congo-- Hydroacoustic measurements in "the river that swallows all rivers". John Shelton South Carolina Water Science Center. Congo River Project. History with AMNH Field verification of model predictions (depth, slope, stream power, roughness, Froude)—WHY??

courtney
Download Presentation

A Field Trip to the Congo-- Hydroacoustic measurements in "the river that swallows all rivers"

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. A Field Trip to the Congo--Hydroacoustic measurements in "the river that swallows all rivers" John Shelton South Carolina Water Science Center

  2. Congo River Project • History with AMNH • Field verification of model predictions (depth, slope, stream power, roughness, Froude)—WHY?? • Acoustic and Water Quality measurement --Fish diversity definition --OSW time tests --Turbulence definition --QW field parameters and samples • --Bathymetry • --Discharge

  3. http://research.amnh.org/ichthyology/congo/index.html

  4. Congo River is a major biogeographic barrier American Museum of Natural History

  5. “...landlocked system was captured in the Miocene (5-15 mya) by a short river draining into the Atlantic Ocean, producing the drainage pattern of Central Africa seen today.” (Stankiewicz & de Wit, 2006) BUT others claim the capture event happened as recently as 400,000 ya (very young) while yet others claim it occurred as long ago as 35mya (very old) American Museum of Natural History

  6. American Museum of Natural History

  7. CURRENT SPECIES COUNT ca. 135 ~ 30% endemism American Museum of Natural History

  8. Lamprologus werneri Lamprologus tigripictilis Lamprologus lethops American Museum of Natural History

  9. Lamprologus lethops American Museum of Natural History

  10. Field Verification and Hydroacoustic Measurements • 7-man kayak team • 80 mile reach • NGS Photo/ videography • Single line bathymetry

  11. Kayak Team 2X • Differential GPS • Echo sounder • Power supply • Data logger • Kayak-cam • Helmet-cam • QW sampling supplies

  12. John & Ned’s Excellent Adventure

  13. Congo River at Luozi • 1.26 million CFS in 22 minutes • 1.3 miles wide • 80 feet deep

  14. …upstream to Pioka

  15. Processing Issues • Power • Power • Bugs

  16. …downstream to Bulu

  17. Water-quality monitor Solar Panel Differential GPS Echo sounder transducer 300 kHz ADCP Laptop Echo sounder Power supply

  18. What IS the deepest river?? ADCP Beam Depth Echo Sounder Depth

  19. Velocity Distribution--Relearned • Areas of significant down-welling • Downstream “jets” at depth

  20. ADCP measurements: Lower Congo River 2008 • 6 random transects • Four surveys Ned Gardiner, PhD AMNH/NOAA

  21. Below Bulu Ned Gardiner, PhD AMNH/NOAA

  22. Ned Gardiner, PhD AMNH/NOAA

  23. Turbulence Definition—Longitudinal transect • Accelerations in “constricted” areas • Velocity “ramps” and “dives” due to bedforms

  24. “The Turbulence”

  25. Where do we go from here? • Primary data processing/interpretation • Relate hydraulic data to fish data • Visualization products --Animations, fact sheets, NG Explorer • Water-quality samples (nutrients, major cations, metals) • Future projects

  26. Questions

More Related