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A probabilistic Bayesian framework to deal with the uncertainty in hydro-climate projection of Zayandeh-Rud River Basin

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Abstract

Different sources of uncertainty exist in climate change impacts projection. This study aims to propose a framework to deal with the various sources of uncertainties involved in hydro-climate projections of Zayandeh-Rud River Basin with area of 26,917 km2 in Central Iran. The Bayesian model averaging (BMA) was here used through two distinct approaches for weighting the hydrologic outputs (App. I) as well as the global climate models (GCMs) (App. II) based on their abilities to simulate the baseline period. The results showed that different GCMs have different abilities in estimating the hydro-climatic variables and the application of uncertainty analysis is necessary for climate change studies. Application of the BMA can significantly reduce the errors in historical runoff prediction. Although App. I showed a better performance of generating the stream flow time series during the baseline period, the App. II approach has an acceptable ability in different months. The findings of flow duration curves under both approaches revealed that App. II is more appropriate to deal with uncertainty of hydro-climate projection especially in arid and semi-arid regions.

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Notes

  1. Intergovernmental Panel on Climate Change

  2. Long Ashton Research Station Weather Generator

  3. Expectation-maximization

  4. Root mean square error

  5. Simple model averaging

  6. Multiple linear regression

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Acknowledgements

We acknowledge the Iran Meteorological Organization for providing the historical data and World Climate Research Program’s Working Group on Coupled Modelling, which is responsible for CMIP, and we thank the climate modeling groups (listed in Table 1 of this paper) for producing and making available their model output. The authors thank the anonymous reviewers for their valuable comments and suggestions.

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Authors

Contributions

All authors collaborated in the research presented in this publication by making the following contributions: research conceptualization, Alireza Gohari (A.G.), Ali Alinezhad (A.A.), Saeid Eslamian (S.E.), and Zahra Saberi (Z.S.); methodology, A.G., A.A., and Z.S.; formal analysis, A.A.; writing—original draft preparation, A.A.; writing—review and editing, A.G. and S.E.; supervision, A.G. and S.E.

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Correspondence to Alireza Gohari.

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The authors declare no competing interests.

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Alinezhad, A., Gohari, A., Eslamian, S. et al. A probabilistic Bayesian framework to deal with the uncertainty in hydro-climate projection of Zayandeh-Rud River Basin. Theor Appl Climatol 144, 847–860 (2021). https://doi.org/10.1007/s00704-021-03575-3

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  • DOI: https://doi.org/10.1007/s00704-021-03575-3

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