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

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
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



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



CURRENT SPECIES COUNT ca. 135 mya) by a short

~ 30% endemism

American Museum of Natural History


Lamprologus werneri mya) by a short

Lamprologus tigripictilis

Lamprologus lethops

American Museum of Natural History


Lamprologus lethops mya) by a short

American Museum of Natural History


Field verification and hydroacoustic measurements
Field Verification and mya) by a shortHydroacoustic Measurements

  • 7-man kayak team

  • 80 mile reach

  • NGS Photo/ videography

  • Single line bathymetry


Kayak Team mya) by a short

2X

  • Differential GPS

  • Echo sounder

  • Power supply

  • Data logger

  • Kayak-cam

  • Helmet-cam

  • QW sampling supplies



Congo river at luozi
Congo River at mya) by a shortLuozi

  • 1.26 million CFS in 22 minutes

  • 1.3 miles wide

  • 80 feet deep


…upstream to Pioka mya) by a short


Processing issues
Processing Issues mya) by a short

  • Power

  • Power

  • Bugs


…downstream to Bulu mya) by a short


Water-quality monitor mya) by a short

Solar Panel

Differential GPS

Echo sounder transducer

300 kHz ADCP

Laptop

Echo sounder

Power supply


What IS the deepest river?? mya) by a short

ADCP Beam Depth

Echo Sounder Depth


Velocity distribution relearned
Velocity Distribution--Relearned mya) by a short

  • Areas of significant down-welling

  • Downstream “jets” at depth


Adcp measurements lower congo river 2008
ADCP measurements: Lower Congo River 2008 mya) by a short

  • 6 random transects

  • Four surveys

Ned Gardiner, PhD AMNH/NOAA


Below bulu
Below mya) by a shortBulu

Ned Gardiner, PhD AMNH/NOAA



Turbulence definition longitudinal transect
Turbulence Definition—Longitudinal transect mya) by a short

  • Accelerations in “constricted” areas

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


The turbulence
“The Turbulence” mya) by a short


Where do we go from here
Where do we go from here? mya) by a short

  • 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
Questions mya) by a short


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