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Uncertainty in Ecohydrological Modeling in an Arid Region Determined with Bayesian Methods
Junjun Yang1, Zhibin He1, Jun Du1
1Linze Inland River Basin Research Station, Chinese Ecosystem Research Network, Key Laboratory of Eco-hydrology of Inland River Basin, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, China.
Simulating soil moisture in arid regions is challenging. The CoupModel showed improved soil moisture prediction accuracy when uncertainty sources were explicitly characterized, aiding arid land management.
Area of Science:
- Environmental science
- Hydrology
- Ecology
Background:
- Soil moisture is crucial for arid ecosystem functioning, linking surface and subsurface life.
- High variability in arid regions makes soil moisture simulation difficult.
Purpose of the Study:
- To assess the CoupModel's applicability for forecasting soil water relations in arid environments.
- To improve soil moisture prediction accuracy by characterizing uncertainty.
Main Methods:
- Utilized vertical soil moisture profiling for CoupModel calibration.
- Explicitly characterized model-structural uncertainty, input/output data errors, and parameter value array errors.
- Applied Bayesian analysis with prior information to reduce predictive uncertainty.
Main Results:
- The CoupModel struggled to capture extreme low soil moisture events, especially below 40 cm depth.
- Explicit characterization of uncertainty sources significantly improved total soil moisture prediction.
- Bayesian analysis effectively reduced uncertainty in soil moisture simulations.
Conclusions:
- The CoupModel can be enhanced for arid region soil moisture forecasting through rigorous uncertainty analysis.
- Improved soil moisture simulation is vital for effective dune stabilization and revegetation in desert-oasis ecotones.
- Addressing model structural uncertainty is key to accurate arid ecosystem modeling.
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