assimilation of streamflow and surface soil moisture observations into a land surface model...
TRANSCRIPT
![Page 1: Assimilation of Streamflow and Surface Soil Moisture Observations into a Land Surface Model Christoph Rüdiger, Jeffrey P. Walker Dept. of Civil & Env](https://reader036.vdocument.in/reader036/viewer/2022070307/551af63e5503466b6a8b65f6/html5/thumbnails/1.jpg)
Assimilation of Streamflow Assimilation of Streamflow and Surface Soil Moisture and Surface Soil Moisture
Observations Observations into a Land Surface Modelinto a Land Surface ModelChristoph Rüdiger, Jeffrey P. WalkerChristoph Rüdiger, Jeffrey P. Walker
Dept. of Civil & Env. Engineering., University of MelbourneDept. of Civil & Env. Engineering., University of Melbourne
Jetse D. KalmaJetse D. KalmaSchool of Engineering, University of NewcastleSchool of Engineering, University of Newcastle
Garry R. WillgooseGarry R. WillgooseEarth & Biosphere Institute, School of Geography, University of LeedsEarth & Biosphere Institute, School of Geography, University of Leeds
Paul R. HouserPaul R. HouserHydrological Sciences Branch, NASA Goddard Space Flight Center,Hydrological Sciences Branch, NASA Goddard Space Flight Center,
Now: Now: George Mason University & Center for Research on Environment and George Mason University & Center for Research on Environment and WaterWater
![Page 2: Assimilation of Streamflow and Surface Soil Moisture Observations into a Land Surface Model Christoph Rüdiger, Jeffrey P. Walker Dept. of Civil & Env](https://reader036.vdocument.in/reader036/viewer/2022070307/551af63e5503466b6a8b65f6/html5/thumbnails/2.jpg)
Christoph RüdigerEGU05
Background
Koster et al., JHM, 2000
![Page 3: Assimilation of Streamflow and Surface Soil Moisture Observations into a Land Surface Model Christoph Rüdiger, Jeffrey P. Walker Dept. of Civil & Env](https://reader036.vdocument.in/reader036/viewer/2022070307/551af63e5503466b6a8b65f6/html5/thumbnails/3.jpg)
Christoph RüdigerEGU05
State of Art
![Page 4: Assimilation of Streamflow and Surface Soil Moisture Observations into a Land Surface Model Christoph Rüdiger, Jeffrey P. Walker Dept. of Civil & Env](https://reader036.vdocument.in/reader036/viewer/2022070307/551af63e5503466b6a8b65f6/html5/thumbnails/4.jpg)
Christoph RüdigerEGU05
Location of Study Catchment
Melbourne
NewcastleSydney
1000km0km
![Page 5: Assimilation of Streamflow and Surface Soil Moisture Observations into a Land Surface Model Christoph Rüdiger, Jeffrey P. Walker Dept. of Civil & Env](https://reader036.vdocument.in/reader036/viewer/2022070307/551af63e5503466b6a8b65f6/html5/thumbnails/5.jpg)
Christoph RüdigerEGU05
Location of Study Catchment
Streamgauge
Soil Moisture
Climate
www.sasmas.unimelb.edu.au
![Page 6: Assimilation of Streamflow and Surface Soil Moisture Observations into a Land Surface Model Christoph Rüdiger, Jeffrey P. Walker Dept. of Civil & Env](https://reader036.vdocument.in/reader036/viewer/2022070307/551af63e5503466b6a8b65f6/html5/thumbnails/6.jpg)
Christoph RüdigerEGU05
Methodology (NLFIT)
Kuczera, 1982
![Page 7: Assimilation of Streamflow and Surface Soil Moisture Observations into a Land Surface Model Christoph Rüdiger, Jeffrey P. Walker Dept. of Civil & Env](https://reader036.vdocument.in/reader036/viewer/2022070307/551af63e5503466b6a8b65f6/html5/thumbnails/7.jpg)
Christoph RüdigerEGU05
Streamflow Assimilation- Single catchement -
Discharge Soil Moisture
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
01/08/03 08/08/03 15/08/03 22/08/03 29/08/03
Date
Vo
lum
etri
c M
ois
ture
Co
nte
nt
[-]
true
Assimilation with "wrong" forcing data (runoff)
0
100
200
300
400
500
600
01/08/03 08/08/03 15/08/03 22/08/03 29/08/03
Date
Dis
char
ge
[m^
3/s]
true
Assimilation with "wrong" forcing data (runoff)
0
100
200
300
400
500
600
01/08/03 08/08/03 15/08/03 22/08/03 29/08/03
Date
Dis
char
ge
[m^
3/s]
true
deg
Assimilation with "wrong" forcing data (runoff)
0
100
200
300
400
500
600
01/08/03 08/08/03 15/08/03 22/08/03 29/08/03
Date
Dis
char
ge
[m^
3/s]
true
deg
assim
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
01/08/03 08/08/03 15/08/03 22/08/03 29/08/03
Date
Vo
lum
etri
c M
ois
ture
Co
nte
nt
[-]
true
degr.
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
01/08/03 08/08/03 15/08/03 22/08/03 29/08/03
Date
Vo
lum
etri
c M
ois
ture
Co
nte
nt
[-]
true
degr.
assim
![Page 8: Assimilation of Streamflow and Surface Soil Moisture Observations into a Land Surface Model Christoph Rüdiger, Jeffrey P. Walker Dept. of Civil & Env](https://reader036.vdocument.in/reader036/viewer/2022070307/551af63e5503466b6a8b65f6/html5/thumbnails/8.jpg)
Christoph RüdigerEGU05
Streamflow Assimilation- Single catchement -
Root Zone Surface Layer
![Page 9: Assimilation of Streamflow and Surface Soil Moisture Observations into a Land Surface Model Christoph Rüdiger, Jeffrey P. Walker Dept. of Civil & Env](https://reader036.vdocument.in/reader036/viewer/2022070307/551af63e5503466b6a8b65f6/html5/thumbnails/9.jpg)
Christoph RüdigerEGU05
Surface Soil Moisture Assimilation
• Eg. Walker et al. (2001) have shown that surface soil moisture assimilation is generally a viable tool for SM updating.
• Can remote sensing data then be used to further constrain variational type assimilations?
![Page 10: Assimilation of Streamflow and Surface Soil Moisture Observations into a Land Surface Model Christoph Rüdiger, Jeffrey P. Walker Dept. of Civil & Env](https://reader036.vdocument.in/reader036/viewer/2022070307/551af63e5503466b6a8b65f6/html5/thumbnails/10.jpg)
Christoph RüdigerEGU05
Adjustments to Experiment Runs
• First initial state estimates are set to average values, rather than extremes
• Maximum and minimum values are not allowed to be violated
• Observation errors of forcing data are made more “realistic” by changing pure bias to bias and white noise errors (Turner et al., in review)
![Page 11: Assimilation of Streamflow and Surface Soil Moisture Observations into a Land Surface Model Christoph Rüdiger, Jeffrey P. Walker Dept. of Civil & Env](https://reader036.vdocument.in/reader036/viewer/2022070307/551af63e5503466b6a8b65f6/html5/thumbnails/11.jpg)
Christoph RüdigerEGU05
Errors and Biases of Forcing Data
Bias Error
Rainfall 25% 25%
Radiation 0% 15%
![Page 12: Assimilation of Streamflow and Surface Soil Moisture Observations into a Land Surface Model Christoph Rüdiger, Jeffrey P. Walker Dept. of Civil & Env](https://reader036.vdocument.in/reader036/viewer/2022070307/551af63e5503466b6a8b65f6/html5/thumbnails/12.jpg)
Christoph RüdigerEGU05
Variational-type Surface Soil Moisture Assimilation
Surf
ace
SM
Run
off
Root
Zone S
M
Pro
file
SM
![Page 13: Assimilation of Streamflow and Surface Soil Moisture Observations into a Land Surface Model Christoph Rüdiger, Jeffrey P. Walker Dept. of Civil & Env](https://reader036.vdocument.in/reader036/viewer/2022070307/551af63e5503466b6a8b65f6/html5/thumbnails/13.jpg)
Christoph RüdigerEGU05
Focus CatchmentsUpper Catchment
Lower Catchment
![Page 14: Assimilation of Streamflow and Surface Soil Moisture Observations into a Land Surface Model Christoph Rüdiger, Jeffrey P. Walker Dept. of Civil & Env](https://reader036.vdocument.in/reader036/viewer/2022070307/551af63e5503466b6a8b65f6/html5/thumbnails/14.jpg)
Christoph RüdigerEGU05
Unmonitored Catchments
Upper Catch.Lower Catch.
Truth Degrad. Assim.
Catchment Deficit
221.744270.119
150.461 148.909
228.773253.190
Root Zone Excess
-5.76858-3.60799
0.00.0
0.0-3.21003
Surface Excess
-0.00615-0.46736
0.79978 0.97535
0.51269 -6.7E-05
![Page 15: Assimilation of Streamflow and Surface Soil Moisture Observations into a Land Surface Model Christoph Rüdiger, Jeffrey P. Walker Dept. of Civil & Env](https://reader036.vdocument.in/reader036/viewer/2022070307/551af63e5503466b6a8b65f6/html5/thumbnails/15.jpg)
Christoph RüdigerEGU05
Summary
• Streamflow Assimilation in subhumid catchments can produce adequate estimates of initial moisture states.
• DA of surface soil moisture observations can act as an additional constraint for the observed catchment.
• Assimilation of both observations has potential for use in finding initial lumped moisture states for a LSM for ungauged upstream catchments.
![Page 16: Assimilation of Streamflow and Surface Soil Moisture Observations into a Land Surface Model Christoph Rüdiger, Jeffrey P. Walker Dept. of Civil & Env](https://reader036.vdocument.in/reader036/viewer/2022070307/551af63e5503466b6a8b65f6/html5/thumbnails/16.jpg)
Christoph RüdigerEGU05
Conclusions
• States of ungauged upstream basins can be retrieved to a certain extent.
• Length of assimilation window will have to be variable for different conditions, esp. if errors in forcing are large and biased.
• Some states may not have an impact on the objective function, but may be retrieved using additional observations of other variables.
• First estimate of initial states can potentially be crucial to success of the proposed DA scheme, hence have to handled appropriately.
![Page 17: Assimilation of Streamflow and Surface Soil Moisture Observations into a Land Surface Model Christoph Rüdiger, Jeffrey P. Walker Dept. of Civil & Env](https://reader036.vdocument.in/reader036/viewer/2022070307/551af63e5503466b6a8b65f6/html5/thumbnails/17.jpg)
Christoph RüdigerEGU05
Acknowledgment• 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)