Assimilation of Streamflow Assimilation of Streamflow and Surface Soil Moisture and Surface Soil Moisture Observations Observations into a Land Surface Model into a Land Surface Model Christoph Rüdiger, Jeffrey P. Walker Christoph Rüdiger, Jeffrey P. Walker Dept. of Civil & Env. Engineering., University of Melbourne Dept. of Civil & Env. Engineering., University of Melbourne Jetse D. Kalma Jetse D. Kalma School of Engineering, University of Newcastle School of Engineering, University of Newcastle Garry R. Willgoose Garry R. Willgoose Earth & Biosphere Institute, School of Geography, University of Earth & Biosphere Institute, School of Geography, University of Leeds Leeds Paul R. Houser Paul R. Houser Hydrological 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 George Mason University & Center for Research on Environment and Water and Water
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Assimilation of Streamflow and Surface Soil Moisture Observations into a Land Surface Model
Assimilation of Streamflow and Surface Soil Moisture Observations into a Land Surface Model. Christoph Rüdiger, Jeffrey P. Walker Dept. of Civil & Env. Engineering., University of Melbourne Jetse D. Kalma School of Engineering, University of Newcastle Garry R. Willgoose - PowerPoint PPT Presentation
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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
Christoph RüdigerEGU05
Background
Koster et al., JHM, 2000
Christoph RüdigerEGU05
State of Art
Christoph RüdigerEGU05
Location of Study Catchment
Melbourne
NewcastleSydney
1000km0km
Christoph RüdigerEGU05
Location of Study Catchment
Streamgauge
Soil Moisture
Climate
www.sasmas.unimelb.edu.au
Christoph RüdigerEGU05
Methodology (NLFIT)
Kuczera, 1982
Christoph RüdigerEGU05
Streamflow Assimilation- Single catchement -
Discharge Soil Moisture
Assimilation with "wrong" forcing data (profile mc)
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Assimilation with "wrong" forcing data (runoff)
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Assimilation with "wrong" forcing data (runoff)
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assim
Assimilation with "wrong" forcing data (profile mc)
0
0.05
0.1
0.15
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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
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Christoph RüdigerEGU05
Streamflow Assimilation- Single catchement -
Root Zone Surface Layer
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?
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)