Emmanuel hydrometrie
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Transcript of Emmanuel hydrometrie
HIC - HYDROMETRY
Emmanuel Cornet
HIC – team validatie
05/2015
Hydrological Information Center (HIC)
Terrain & measurements
Sediment laboratory
Data management
GIS
Permanence Forecasts
Data
Validation
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)
Discharge validation workflow
Continuous field measurement Calibration measurements
HIC’s hydrometrical network
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 probe Radar Level Sensor
Acoustic Level Sensors
Monitoring equipment
flowmeters
Acoustic Doppler
Profilers (ADP)
(10 stations)
(34 stations)
Continuous flowmeters
NON-CONTACT DISCHARGE RADAR
SOMMER RQ-30
HTTP://WWW.SOMMER.AT
Discharge validation workflow
Continuous field measurement Calibration measurements
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 hour Operator training
and experience
Calibration equipment
Acoustic Doppler : OTT Q-Liner
“Q-Liner”
max. depth 10m
duration : 10-20’
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)
Measurement configurations with
Acoustic Doppler (ADP) flowmeters
Continuous monitoring
(shallow water) Continuous monitoring
(side looking)
Moving boat
calibration
Discharge validation workflow
Continuous field measurement Calibration measurements
Visualisation tools of calibration
instruments
AGILA
Qreview Q-Liner
RDI Streampro, Rio Grande
Qmeting
Traditional
current meters
WinRiver
DES
“Qreview” for doppler Q-Liner
“WinRiver II” for RDI moving boat
> ASCII output for AGILA
Q
A ?
Vm ?
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
“AGILA” for RDI moving boat
Q
> A
> Vm
Discharge validation workflow
Continuous field measurement Calibration measurements
Discharge evaluation system (DES)
- comparing calibrations regardless of instrument
- rating curve editor for QH and QQ-stations
Discharge evaluation system (DES)
- comparing all calibrations regardless of instrument
- rating curve editor for QH and QQ-stations
Discharge validation workflow
Continuous field measurement Calibration measurements
WISKI - time series validation /
rating curve import from DES
WISKI TS-validation : plausibility checks, spike
removals, offsets, gap filling by correlation,
quality flags…….
WISKI - time series validation
WISKI – importing the rating curve in SKED
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 discharge H = waterlevel
2. QQ-rating
Q=f(Qcont)
level
gauges
flowmeters
QH rating validation Q = f(H)
bottom slope change
bottom siltation / erosion
hysteresis
9 HIC QH-stations
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
QH - stage fall method Q = f(H, dH)
value(1) = H1
value(2) = H2
WISKI TS implementation
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
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)
Discharge validation workflow
Continuous field measurement Calibration measurements
Real time data
www.waterinfo.be
Real time data
www.waterinfo.be
Hydrological yearbook