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

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


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

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


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

Congo River is a major biogeographic barrier

American Museum of Natural History


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

“...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


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

American Museum of Natural History


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

CURRENT SPECIES COUNT ca. 135

~ 30% endemism

American Museum of Natural History


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

Lamprologus werneri

Lamprologus tigripictilis

Lamprologus lethops

American Museum of Natural History


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

Lamprologus lethops

American Museum of Natural History


Field verification and hydroacoustic measurements

Field Verification and Hydroacoustic Measurements

  • 7-man kayak team

  • 80 mile reach

  • NGS Photo/ videography

  • Single line bathymetry


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

Kayak Team

2X

  • Differential GPS

  • Echo sounder

  • Power supply

  • Data logger

  • Kayak-cam

  • Helmet-cam

  • QW sampling supplies


John ned s excellent adventure

John & Ned’s Excellent Adventure


Congo river at luozi

Congo River at Luozi

  • 1.26 million CFS in 22 minutes

  • 1.3 miles wide

  • 80 feet deep


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

…upstream to Pioka


Processing issues

Processing Issues

  • Power

  • Power

  • Bugs


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

…downstream to Bulu


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

Water-quality monitor

Solar Panel

Differential GPS

Echo sounder transducer

300 kHz ADCP

Laptop

Echo sounder

Power supply


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

What IS the deepest river??

ADCP Beam Depth

Echo Sounder Depth


Velocity distribution relearned

Velocity Distribution--Relearned

  • Areas of significant down-welling

  • Downstream “jets” at depth


Adcp measurements lower congo river 2008

ADCP measurements: Lower Congo River 2008

  • 6 random transects

  • Four surveys

Ned Gardiner, PhD AMNH/NOAA


Below bulu

Below Bulu

Ned Gardiner, PhD AMNH/NOAA


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

Ned Gardiner, PhD AMNH/NOAA


Turbulence definition longitudinal transect

Turbulence Definition—Longitudinal transect

  • Accelerations in “constricted” areas

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


The turbulence

“The Turbulence”


Where do we go from here

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

Questions


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