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

2. Theoretical
introduction
Practical
data acquisition & calibration

3. ADCP measures:
water velocity

4. ADCP measures:
water velocity

5. ADCP measures:
water velocity

7. ADCP measures:
Relative Backscatter
(echo strength)

8. ADCP measures:
Relative Backscatter
Provides:
spatial overview

10. ADCP measures:
Relative Backscatter
Provides:
spatial overview

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

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

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

14. 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]

15. VISEA-DAS Survey & Plume Detection Toolbox

16. 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

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

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

19. 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

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

21. Calibration
Sensor Setup

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

26. Typical sample/measuring scheme
3 Profile/calibration measurements

28. Typical sample/measuring scheme
3 Profile/calibration measurements

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

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

33. Typical sample/measuring scheme
3 Profile/calibration measurements

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

35. Every hour 
3 Profile measurements

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