A field trip to the congo hydroacoustic measurements in the river that swallows all rivers
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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??

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

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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??

  • Acoustic and Water Quality measurement

    --Fish diversity definition

    --OSW time tests

    --Turbulence definition

    --QW field parameters and samples

  • --Bathymetry

  • --Discharge


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


Congo River is a major biogeographic barrier

American Museum of Natural History


“...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


American Museum of Natural History


CURRENT SPECIES COUNT ca. 135

~ 30% endemism

American Museum of Natural History


Lamprologus werneri

Lamprologus tigripictilis

Lamprologus lethops

American Museum of Natural History


Lamprologus lethops

American Museum of Natural History


Field Verification and Hydroacoustic Measurements

  • 7-man kayak team

  • 80 mile reach

  • NGS Photo/ videography

  • Single line bathymetry


Kayak Team

2X

  • Differential GPS

  • Echo sounder

  • Power supply

  • Data logger

  • Kayak-cam

  • Helmet-cam

  • QW sampling supplies


John & Ned’s Excellent Adventure


Congo River at Luozi

  • 1.26 million CFS in 22 minutes

  • 1.3 miles wide

  • 80 feet deep


…upstream to Pioka


Processing Issues

  • Power

  • Power

  • Bugs


…downstream to Bulu


Water-quality monitor

Solar Panel

Differential GPS

Echo sounder transducer

300 kHz ADCP

Laptop

Echo sounder

Power supply


What IS the deepest river??

ADCP Beam Depth

Echo Sounder Depth


Velocity Distribution--Relearned

  • Areas of significant down-welling

  • Downstream “jets” at depth


ADCP measurements: Lower Congo River 2008

  • 6 random transects

  • Four surveys

Ned Gardiner, PhD AMNH/NOAA


Below Bulu

Ned Gardiner, PhD AMNH/NOAA


Ned Gardiner, PhD AMNH/NOAA


Turbulence Definition—Longitudinal transect

  • Accelerations in “constricted” areas

  • Velocity “ramps” and “dives” due to bedforms


“The Turbulence”


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


Questions


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