Sediment Flux & ADCP

Jeroen Aardoom

Aqua VisionThe Netherlands

Sediment Flux (g/s) = Q (m3/s) * SSC (g/m3)

Q (m3/s)

ADCP measures water velocity (discharge)

Sediment Flux (g/s) = Q (m3/s) * SSC (g/m3)

Q (m3/s)

ADCP measures water velocity (discharge)

ADCP 36.9 m3/s

Sediment Flux (g/s) = Q (m3/s) * SSC (g/m3)

SSC (g/m3)

Take a water sample

Flux 1 sample = 36.9 m3/s * 32 (g/m3) = 1.18 kg/s

Sediment Flux (g/s) = Q (m3/s) * SSC (g/m3)

SSC (g/m3)

Take multiple water samples, Sai

Average SSC samples < Sai > = 30.2 g/m3

Flux 9 samples = 36.9 m3/s * 30.2 (g/m3) = 1.11 kg/s

Sediment Flux (g/s) = Q (m3/s) * SSC (g/m3)

SSC (g/m3)

Averaging should be weighted with Q

Flux = QL*<SaL1,2,3> + QM*<SaM1,,2,3> + QR*<SaR1,,2,3>

QL QM QR

Flux (g/s) = Q (m3/s) * SSC (g/m3)

SSC (g/m3)

Instead of 3 sections

Flux ADCPQbin*SCCbin = 1.85 kg/s

QL QM QR

, use Q per ADCP bin, and SSC per bin

Flux (g/s) = Q (m3/s) * SSC (g/m3)

SSC (g/m3)

Flux 9 samples = 1.11 kg/s

Flux 1 sample = 1.18 kg/s

Flux ADCP = 1.85 kg/s

Flux = QL QM QR

Sediment Flux (g/s) = Q (m3/s) * SSC (g/m3)

SSC (g/m3)

Need to convert ADCP signal to SSC

Software tool for conversion

ViSea - STB (PDT)

ViSea STAR

ViSea STB (PDT) versus ViSea STAR

ViSea STB (PDT)3-D, survey packageReal Time data acquisitionADCP, GPS, OBS, CTD, DS, Gyro etcAccounts for stratified conditionsFor dredge plumes and tidal/estuary

ViSea STAR 1 screen onlyPost processingEasy to useFor inland waterways, natural streams

ViSea STAR