Emmanuel Cornet (WL-HIC) stelde het meetnet van het HIC voor met aandacht voor het opstellen van Q/H relaties en de instrumenten die worden gebruikt om meetlocaties te ijken. De workshop gaf de deelnemers inzichten en tools die ze zelf kunnen gebruiken in hun eigen werk. Een interessante kruisbestuiving!

1. HIC - HYDROMETRY
Emmanuel Cornet
HIC – team validatie
05/2015

2. Hydrological Information Center (HIC)
Terrain &
measurements
Sediment
laboratory
Data
management
GIS
PermanenceForecasts
Data
Validation

3. Hydrometry*or streamgaging
in a river location involves
1. a continuous record of stage H (, current velocity V + field discharge Qcont)
2. periodic calibration measurements of discharge (m³/s)
3. defining the discharge relation (QH or QQ)
4. using the discharge relation to convert the continuously measured H or Qcont into discharge
time series
* Hydrometry is the monitoring of the components of the hydrological cycle including
rainfall, groundwater characteristics, as well as water quality and flow characteristics of
surface waters (Wikipedia)

4. Discharge validation workflow
Continuous field measurement Calibration measurements

5. HIC’s hydrometrical network

6. Monitoring equipment
Level gauges
staff gauge
• standard/calibration of stage measurement
• must not move vertically
• topographic levelling: reference elevation (datum
in m TAW)
• s.g. regular readings: level gauge control (time
series)
Pressure probeRadar Level Sensor
Acoustic Level Sensors

7. Monitoring equipment
flowmeters
Acoustic Doppler
Profilers (ADP)
(10 stations)
(34 stations)

8. Continuous flowmeters
NON-CONTACT DISCHARGE RADAR
SOMMER RQ-30
HTTP://WWW.SOMMER.AT

9. Discharge validation workflow
Continuous field measurement Calibration measurements

10. Calibration equipment
traditional current meters
International Standard –
Measurement of liquid flow in
open channels – Velocity-area
methods, ISO 748 :1997 (E)
max. depth 10m
duration : >1 hourOperator training
and experience

11. Calibration equipment
Acoustic Doppler : OTT Q-Liner
“Q-Liner”
max. depth 10m
duration : 10-20’

12. Calibration equipment :
Moving boat Acoustic Doppler (ADCP)
“RDI Streampro”
max. depth 4 m
duration : 1-3 min
“RDI Rio Grande”
max.depth 15-20 m
duration : 1-3 min
ISO/TS 24154:2005(E)

13. Measurement configurations with
Acoustic Doppler (ADP) flowmeters
Continuous monitoring
(shallow water)
Continuous monitoring
(side looking)
Moving boat
calibration

14. Discharge validation workflow
Continuous field measurement Calibration measurements

15. Visualisation tools of calibration
instruments
AGILA
Qreview Q-Liner
RDI Streampro, Rio Grande
Qmeting
Traditional
current meters
WinRiver
DES

16. “Qreview” for doppler Q-Liner

17. “WinRiver II” for RDI moving boat
> ASCII output for AGILA
Q
A ?
Vm ?

18. from WinRiver II to AGILA
making non-linear moving boat calibrations
comparable with linear ones
WinRiver
Qtotal = 20.26 m³/s
Area = 226.14 m² too high
Vm = Q/A = 0.09 m/s too low
AGILA
Qtrans = 19.62 m³/s
Qagila = 21.01 m³/s
Area = 174.64 m² corrected
Vm = 0.12 m/s corrected
DES

19. “AGILA” for RDI moving boat
Q
> A
> Vm

20. Discharge validation workflow
Continuous field measurement Calibration measurements

21. Discharge evaluation system (DES)
- comparing calibrations regardless of instrument
- rating curve editor for QH and QQ-stations

22. Discharge evaluation system (DES)
- comparing all calibrations regardless of instrument
- rating curve editor for QH and QQ-stations

23. Discharge validation workflow
Continuous field measurement Calibration measurements

24. WISKI - time series validation /
rating curve import from DES
WISKI TS-validation : plausibility checks, spike
removals, offsets, gap filling by correlation,
quality flags…….

25. WISKI - time series validation

26. WISKI – importing the rating curve in SKED

27. Q rating curves for QH and QQ stations
1. QH-rating
Q=f(H)
natural rivers
no backwater
steady flow
Canals, canalized rivers
(weirs, locks)
Tidal rivers
Qcont = continuous flowmeter dischargeH = waterlevel
2. QQ-rating
Q=f(Qcont)
level
gauges
flowmeters

28. QH rating validation Q = f(H)
bottom slope change
bottom siltation / erosion
hysteresis
9 HIC QH-stations

29. QH - stage fall method Q = f(H, dH)
Station 1 stage H1
Station 2 stage H2
Q = f(H,dH) dH = H1 – H2
• Backwater analysis for measured high waterlevel events
• When a flowmeter is difficult to install and no velocities can be monitored
• Low gradient / shallow sloped – backwater corrections
• Establish the functional relation of stage, fall and discharge!
Q
t
Station 2
Station 1
IJzer
floodplain

30. QH - stage fall method Q = f(H, dH)
value(1) = H1
value(2) = H2
WISKI TS implementation

31. QH - weed growth corrections
Discharge correction based on
correlation with summer stages in a weedless
station and/or
multiple summer calibration measurements
Vegetation prone HIC-rivers:
• Zenne (+Dijle)
• Kleine en Grote Nete
• Demer

32. QQ rating – Q = f(Qcont)
correcting continuous field discharge
Calibrated
discharge
Continuous flow
measurement
Corrected discharge = f(continuous discharge)
calibration
Continuous
discharge
Index velocity Q = A * Vm Vm = f(Vcont)

33. Discharge validation workflow
Continuous field measurement Calibration measurements

34. Real time data
www.waterinfo.be

35. Real time data
www.waterinfo.be

36. Hydrological yearbook