Survey Toolbox & Plume Detection Toolbox

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Presentation transcript:

Survey Toolbox & Plume Detection Toolbox ViSea-DAS Survey Toolbox & Plume Detection Toolbox (Introduction) Jeroen Aardoom Aqua Vision BV

Theoretical introduction Practical data acquisition & calibration

ADCP measures: water velocity

ADCP measures: water velocity

ADCP measures: water velocity

ADCP measures: Relative Backscatter (echo strength)

ADCP measures: Relative Backscatter Provides: spatial overview

ADCP measures: Relative Backscatter Provides: spatial overview

ADCP measures: Relative Backscatter Provides: spatial overview 3-D

ADCP measures: Relative Backscatter Provides: spatial 3D overview Disadvantage: qualitative, no SSC (mg/l)

The Challenge: Quantify SSC, in Real-Time Correct for signal losses: range&instrument normalization water absorption sediment absorption

The working equation (Deines) Sv normalized backscatter [dB] C constant [dB] TT temperature of the transducer [°K] R slant range along the beam [m] L transmit pulse length [m] PT transmit power [W] aw water absorption [dB/m] as particle attenuation [dB/m] Kc RSSI scale factor [dB/count] E echo intensity [count] Er received noise [count]

VISEA-DAS Survey & Plume Detection Toolbox

Survey & Plume Detection Toolbox VISEA-DAS Survey & Plume Detection Toolbox Converts backscatter to SSC Acquires the data Real Time All data within 1 format & timestamp

Survey & Plume Detection Toolbox VISEA-DAS Survey & Plume Detection Toolbox ViSea-DAS

Survey & Plume Detection Toolbox VISEA-DAS Survey & Plume Detection Toolbox Survey & Plume Detection Toolbox

Correlation / calibration OBS Raw data : Volt/Ampere Is converted -> NTU water samples calibration -> SSC mg/l ADCP Raw data : Relative Backscatter Is converted -> Absolute Backscatter

Correlation / calibration Onboard vessel / Real Time OBS (NTU) ADCP (IdB) Calibration

Calibration Sensor Setup

Typical sample/measuring scheme 3 Profile/calibration measurements Cross section/Transects measurements

Typical sample/measuring scheme 3 Profile/calibration measurements

Typical sample/measuring scheme 3 Profile/calibration measurements

Correlation / calibration Onboard vessel / Real Time OBS (NTU) ADCP (IdB) Calibration

Typical sample/measuring scheme Every hour  3 Profile/calibration measurements

Typical sample/measuring scheme 3 Profile/calibration measurements

Correlation / calibration Post processing / analysis Samples (mg/l) Calibration Calibration OBS (NTU) ADCP (IdB) Cross validation

Every hour  3 Profile measurements

Estuary - hourly calibration Every hour  3 Profile measurements Transect measurements

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