Post on 28-Dec-2015
Final Presentation
UNSA, NiceHydroEurope
05th March, 2010
What are or what should be the reasonable criteria for the Var model calibration (MIKE 11 & MIKE SHE) ?
Team Members Claire Elodie Freda Yi Gopi
Sandor Sun-Ah
MODEL CALIBRATION IN GENERAL
MIKE SHE
MIKE 11
RECOMMENDATIONS & CONCLUSION
HYDROEUROPE
Before Calibration *Details of the model area
*Input data *Model selection
*Sensitivity analysis During calibration *Physical meaning of parameters
After calibration *Compare with validation data
Spatial discretisation:
• 300 m grid resolution• Not able to consider sharp changes in topography• Discharge is underestimated• Simulated discharge Q= 100 cu.m/sec• Coupling would help to overcome this problem
Simulation Period Selection ( 1 or 3 days ) Influence – before & after
3 days result 1 day result
Data Accuracy & Reliability Height is known but the discharge value is
estimated from height
Do we need to calibrate everytime?
Built only for the Lower Var River Provided data i.e. network, x-sects Upstream boundary – Q at Var and
Esteron confluence from MIKE SHE/ MIKE 11 coupled model of entire Var catchment.
Downstream – Sea level Strickler, M = 30 m1/3/s (default) Weir coeff same for all ≈ 0.486
(provided in river network file)
Rougness decreases , discharge downstream increases
Rougness decreases , Max water level increases
Weir coeff decreases, Max Water level increases
2900
2950
3000
3050
3100
Disc
harg
e (m
3 /s)
Time (hrs)
M=15
M=20
M=25
M=30
M=35
0
500
1000
1500
2000
2500
3000
3500
Discha
rge (m
3 /s)
Time (hrs)
M=15
M=20
M=25
M=30
M=3516
18
20
22
24
Max. w
ater le
vel (m
)
Chainage (m)
M = 35
M = 30
M = 25
M = 20
M = 15
020406080
100120140160
Max
. wat
er le
vel (m
)
Chainage (m)
M = 35
M = 30
M = 25
M = 20
M = 15
60
62.5
65
67.5
70
Max
. wat
er le
vel (
m)
Chainage (m)
C= 1.5
C = 2.0
C = 2.5
Weir 8
Weir 7
•No reliable observed discharge values – no calibration done with discharge.•Max water level - discharge relation only established for the low usual discharge values of stage•Calibration done using maximum water levels over river length.
•After Calibration,•Strickler, M = 24•Weir coeff = 0.465
90
92
94
96
98
100
Max
wat
er le
vel (
m)
Chainage (m)
Measured
M=24
90
92
94
96
98
100M
ax w
ater
leve
l (m
)
Chainage (m)
Measured
M=24
Honma weir equation with an original, C ≈ 0.486 =c √2g and calibrated coefficient C = c √2g = 2
Calibrated value of C= 2 (has a factor of √2g) Without the factor, c ≈0.465 for all weirs. Usu.range
is 0.5 – 0.7 but 0.465 is acceptable – higher energy loss due to power station.
Not realistic for all weirs to have similar coeffs.
40
60
80
10000 12000 14000
Max
wat
er le
vel (
m)
Chainage (m)
Initial Simulation C = 0.486Measured stagecalibrated wier coeff=2.0
40
60
80
10000 12000 14000
Max
wat
er le
vel (
m)
Chainage (m)
Initial Simulation C = 0.486Measured stagecalibrated wier coeff=2.0
Weir 6
Weir 7
Weir 5
Weir 4
Sediment transport not simulated Flooding over the river banks not accounted for by model Weirs 10 and 16 are currently submerged Weirs 2 and 3 washed away during flood of 1994 but existed
during the flood, so also had a effect on the flood routing Cross sections are always changing. Flood was in 1994.
sections measured in 2001 and we are designing for the future. Model questionable???
Upstream boundary is from a model, with uncertainty Downstream boundary is also not very certain (sea level???) No validation data available
Set up more data collection/metrological stations in entire catchment i.e. rainfall
Use updated data Observations during flood Cross sections Weir characteristics
Appropriate resolutions give better results according to study objectives
During calibration, do not forget to think about the physical processes and significance of parameters.
Including the flooded zone (e.g. MIKE FLOOD) is recommended to have better model calibration i.e. simulate water that flows over the river banks.
Seek the opinion of the experts and model for a wider range of possible events
Team AQUAHOLIX
Happy B’day Kate !!!
Thanks for your attention !!!
감사합니다
köszönöm a figyelmet
Danke
Gracias
Merci
Gràcies
धन्यवा�द
Спасибо
謝謝
ありがとう
Bedankt
Хвала
Cảm ơn
Mwanyala nnabiAsante sana