retrieving soil moisture states using streamflow data assimilation c. rüdiger a supervisors:...
TRANSCRIPT
![Page 1: Retrieving Soil Moisture States Using Streamflow Data Assimilation C. Rüdiger a Supervisors: Jeffrey P. Walker a, Jetse D. Kalma b, Garry R. Willgoose](https://reader036.vdocuments.net/reader036/viewer/2022062404/551af6405503462e578b4c24/html5/thumbnails/1.jpg)
Retrieving Soil Moisture States Using Streamflow Data
Assimilation C. Rüdigera
Supervisors:Jeffrey P. Walkera, Jetse D. Kalmab,
Garry R. Willgoosec
a Dept. of Civil & Env. Eng., University of Melbourne, Australia
b School of Engineering, University of Newcastle, Australia
c School of Geography, University of Leeds, United Kingdom
![Page 2: Retrieving Soil Moisture States Using Streamflow Data Assimilation C. Rüdiger a Supervisors: Jeffrey P. Walker a, Jetse D. Kalma b, Garry R. Willgoose](https://reader036.vdocuments.net/reader036/viewer/2022062404/551af6405503462e578b4c24/html5/thumbnails/2.jpg)
Christoph Rüdiger
Postgrad Seminar 2004
Koster et al., JHM, 2000
![Page 3: Retrieving Soil Moisture States Using Streamflow Data Assimilation C. Rüdiger a Supervisors: Jeffrey P. Walker a, Jetse D. Kalma b, Garry R. Willgoose](https://reader036.vdocuments.net/reader036/viewer/2022062404/551af6405503462e578b4c24/html5/thumbnails/3.jpg)
Christoph Rüdiger
Postgrad Seminar 2004
![Page 4: Retrieving Soil Moisture States Using Streamflow Data Assimilation C. Rüdiger a Supervisors: Jeffrey P. Walker a, Jetse D. Kalma b, Garry R. Willgoose](https://reader036.vdocuments.net/reader036/viewer/2022062404/551af6405503462e578b4c24/html5/thumbnails/4.jpg)
Christoph Rüdiger
Postgrad Seminar 2004
Goulburn Catchment
Melbourne
NewcastleSydney
1000km0km
![Page 5: Retrieving Soil Moisture States Using Streamflow Data Assimilation C. Rüdiger a Supervisors: Jeffrey P. Walker a, Jetse D. Kalma b, Garry R. Willgoose](https://reader036.vdocuments.net/reader036/viewer/2022062404/551af6405503462e578b4c24/html5/thumbnails/5.jpg)
Christoph Rüdiger
Postgrad Seminar 2004
Goulburn Catchment
Streamgauge
Soil Moisture
Climate
www.civenv.unimelb.edu.au/~jwalker/data/oznet/
![Page 6: Retrieving Soil Moisture States Using Streamflow Data Assimilation C. Rüdiger a Supervisors: Jeffrey P. Walker a, Jetse D. Kalma b, Garry R. Willgoose](https://reader036.vdocuments.net/reader036/viewer/2022062404/551af6405503462e578b4c24/html5/thumbnails/6.jpg)
Christoph Rüdiger
Postgrad Seminar 2004
Catchment Land Surface Model
Koster et al., JGR, 2000Saturation
Depth
Water Table
Eq. profile
Moisture Deficit
D = 0
D = smallD = large
Prognostic variables:
•Catchment Deficit
•Surface Moisture Excess
•Root Zone Excess
![Page 7: Retrieving Soil Moisture States Using Streamflow Data Assimilation C. Rüdiger a Supervisors: Jeffrey P. Walker a, Jetse D. Kalma b, Garry R. Willgoose](https://reader036.vdocuments.net/reader036/viewer/2022062404/551af6405503462e578b4c24/html5/thumbnails/7.jpg)
Christoph Rüdiger
Postgrad Seminar 2004
Internal routing
Travel time TpiVelocity weight v-1
Unit Hydrograph for Catchment
0
0.05
0.1
0.15
0.2
0.25
0.3
1 2 3 4 5 6 7 8
Hours
Co
ntr
ibu
tin
g F
rac.
of
To
tal
Are
a [1
/h]
![Page 8: Retrieving Soil Moisture States Using Streamflow Data Assimilation C. Rüdiger a Supervisors: Jeffrey P. Walker a, Jetse D. Kalma b, Garry R. Willgoose](https://reader036.vdocuments.net/reader036/viewer/2022062404/551af6405503462e578b4c24/html5/thumbnails/8.jpg)
Christoph Rüdiger
Postgrad Seminar 2004
Synthetic ExperimentVariational Data Assimilation
model outp
ut
time
ob
j. f
un
ctio
n
assimilation step
NLFIT (Kuczera, WRR, 1982)
• “Truth”:– 10yr spin up– 1yr full run
• “Experiment 1”:– One month only– Degraded soil moisture values (low catchment deficit)
• “Experiment 2”:– “Openloop 1” and changed forcing (33% lower radiation and
20% higher precipitation)
![Page 9: Retrieving Soil Moisture States Using Streamflow Data Assimilation C. Rüdiger a Supervisors: Jeffrey P. Walker a, Jetse D. Kalma b, Garry R. Willgoose](https://reader036.vdocuments.net/reader036/viewer/2022062404/551af6405503462e578b4c24/html5/thumbnails/9.jpg)
Christoph Rüdiger
Postgrad Seminar 2004
Results from assimilation with "true" forcing (runoff)
0
50
100
150
200
250
300
350
400
01-Aug 08-Aug 15-Aug 22-Aug 29-Aug
Date
Dis
char
ge [
m^3
/s]
true
Results from assimilation with "true" forcing (profile mc)
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
01-Aug 08-Aug 15-Aug 22-Aug 29-Aug
DateV
WC
[-]
true
Results from assimilation with "true" forcing (runoff)
0
50
100
150
200
250
300
350
400
01-Aug 08-Aug 15-Aug 22-Aug 29-Aug
Date
Dis
char
ge [
m^3
/s]
truedeg
Results from assimilation with "true" forcing (profile mc)
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
01-Aug 08-Aug 15-Aug 22-Aug 29-Aug
DateV
WC
[-]
truedeg
Results from assimilation with "true" forcing (runoff)
0
50
100
150
200
250
300
350
400
01-Aug 08-Aug 15-Aug 22-Aug 29-Aug
Date
Dis
char
ge [
m^3
/s]
truedegDA
Results from assimilation with "true" forcing (profile mc)
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
01-Aug 08-Aug 15-Aug 22-Aug 29-Aug
DateV
WC
[-] true
degDA
Results “Experiment 1”
Discharge Soil Moisture
![Page 10: Retrieving Soil Moisture States Using Streamflow Data Assimilation C. Rüdiger a Supervisors: Jeffrey P. Walker a, Jetse D. Kalma b, Garry R. Willgoose](https://reader036.vdocuments.net/reader036/viewer/2022062404/551af6405503462e578b4c24/html5/thumbnails/10.jpg)
Christoph Rüdiger
Postgrad Seminar 2004
Results “Experiment 1”Results from assimilation with "true" forcing (runoff)
0
50
100
150
200
250
300
350
400
01/08/2003 02/08/2003 03/08/2003
Date
Dis
char
ge [m
^3/s
]
truedegDA
![Page 11: Retrieving Soil Moisture States Using Streamflow Data Assimilation C. Rüdiger a Supervisors: Jeffrey P. Walker a, Jetse D. Kalma b, Garry R. Willgoose](https://reader036.vdocuments.net/reader036/viewer/2022062404/551af6405503462e578b4c24/html5/thumbnails/11.jpg)
Christoph Rüdiger
Postgrad Seminar 2004
Results form assimilation with "wrong" forcing data (runoff)
0
100
200
300
400
500
600
01-Aug 08-Aug 15-Aug 22-Aug 29-Aug
Date
Dis
char
ge [
m^3
/s]
true
Results form assimilation with "wrong" forcing data (profile mc)
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
01-Aug 08-Aug 15-Aug 22-Aug 29-Aug
DateV
olu
met
ric M
ois
ture
Co
nte
nt [-
]
true
Results form assimilation with "wrong" forcing data (runoff)
0
100
200
300
400
500
600
01-Aug 08-Aug 15-Aug 22-Aug 29-Aug
Date
Dis
char
ge [
m^3
/s]
truedeg
Results form assimilation with "wrong" forcing data (profile mc)
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
01-Aug 08-Aug 15-Aug 22-Aug 29-Aug
DateV
olu
met
ric M
ois
ture
Co
nte
nt [-
]
truedeg
Results form assimilation with "wrong" forcing data (runoff)
0
100
200
300
400
500
600
01-Aug 08-Aug 15-Aug 22-Aug 29-Aug
Date
Dis
char
ge [
m^3
/s]
truedegDA
Results form assimilation with "wrong" forcing data (profile mc)
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
01-Aug 08-Aug 15-Aug 22-Aug 29-Aug
DateV
olu
met
ric M
ois
ture
Co
nte
nt [-
]
truedegDA
Results “Experiment 2”
Discharge Soil Moisture
![Page 12: Retrieving Soil Moisture States Using Streamflow Data Assimilation C. Rüdiger a Supervisors: Jeffrey P. Walker a, Jetse D. Kalma b, Garry R. Willgoose](https://reader036.vdocuments.net/reader036/viewer/2022062404/551af6405503462e578b4c24/html5/thumbnails/12.jpg)
Christoph Rüdiger
Postgrad Seminar 2004
Results “Experiment 2”Results form assimilation with "wrong" forcing data (runoff)
0
100
200
300
400
500
600
23-Aug 24-Aug 25-Aug
Date
Dis
char
ge [
m^3
/s]
truedegDA
![Page 13: Retrieving Soil Moisture States Using Streamflow Data Assimilation C. Rüdiger a Supervisors: Jeffrey P. Walker a, Jetse D. Kalma b, Garry R. Willgoose](https://reader036.vdocuments.net/reader036/viewer/2022062404/551af6405503462e578b4c24/html5/thumbnails/13.jpg)
Christoph Rüdiger
Postgrad Seminar 2004
Conclusion from Results
• Results show that runoff has useful information about soil moisture states
• Problems in semi-arid regions, when overestimation of water input due to degraded forcing data (potentially for too dry, as well!?)
• Monthly assimilation windows have positive impact, reduction of assimilation window should improve results further
![Page 14: Retrieving Soil Moisture States Using Streamflow Data Assimilation C. Rüdiger a Supervisors: Jeffrey P. Walker a, Jetse D. Kalma b, Garry R. Willgoose](https://reader036.vdocuments.net/reader036/viewer/2022062404/551af6405503462e578b4c24/html5/thumbnails/14.jpg)
Christoph Rüdiger
Postgrad Seminar 2004
Future Work
• Including inter-catchment routing• Comparison of different climates
(real data)• Assimilation of surface soil moisture
![Page 15: Retrieving Soil Moisture States Using Streamflow Data Assimilation C. Rüdiger a Supervisors: Jeffrey P. Walker a, Jetse D. Kalma b, Garry R. Willgoose](https://reader036.vdocuments.net/reader036/viewer/2022062404/551af6405503462e578b4c24/html5/thumbnails/15.jpg)
Christoph Rüdiger
Postgrad Seminar 2004
Acknowledgments• Australian Research Council (ARC-DP grant
0209724)• Hydrological Sciences Branch, National
Aeronautics and Space Administration (NASA), USA
• University of Melbourne – Melbourne International Fee Remission
Scholarship (MIFRS)– Postgraduate Overseas Research Experience
Scholarship (PORES)