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