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Does comprehensive evaluation of hydrological models influence projected changes of mean and high flows in the Godavari River basin?

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Abstract

Understanding the projected changes in the mean and high flows remains a significant challenge due to uncertainty arising from global climate models (GCMs) and hydrological models. Moreover, the calibration approaches used for hydrological models can influence the climate change impact assessment. We use the combination of three hydrological models, four global climate models, and two RCPs (2.6 and 8.5) to analyze the projected changes in mean flow, high flow, and the frequency of high flow under the projected future climate in the Godavari River basin (GRB) until the gauge Tekra. The two evaluation approaches: a simple approach (TASK A) based on the calibration and validation at a single streamflow gauge station and a comprehensive approach (TASK B) based on multi-variable and multisite calibration and validation and trend analysis were employed to evaluate the hydrological models. The differences between the projected changes in mean and high flows calculated using models after TASK A and TASK B were estimated. Our results show that the differences can be up to 10–13% in mean annual flow and high flow, and up to 40% in high flow frequency. The comprehensively evaluated hydrological models were chosen for impact assessment, and they project increases in mean and high flows, and the frequency of high flow at all four gauge stations in the GRB. The projected increases are higher under RCP 8.5 and in the End century (2071–2100). Our results demonstrate the importance of the comprehensive evaluation of hydrological models in advance of climate change impact assessment.

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Acknowledgments

This work was supported by the Ministry of Earth Sciences and Ministry of Water Resources Government of India. The Federal Ministry for the Environment, Nature Conservation, and Nuclear Safety (BMU) support this initiative on the basis of a decision adopted by the German Bundestag. We appreciate the assistance from Stephanie Gleixner in preparation of supplemental figure(s).

Funding

The financial support was received for the project An Experimental Operational Hydrologic Modeling and Forecasting System for River Basin Hydrology and Extremes for India project, the East Africa Peru India Climate Capacities (EPICC) project, and the International Climate Initiative (IKI) project. The first author acknowledge the funding from Ministry of Water Resources, Ministry of Earth Sciences, and Ministry of Environment, Forest, and Climate Change, Government of India.

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Correspondence to Vimal Mishra.

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This article is part of a Special Issue on “How evaluation of hydrological models influences results of climate impact assessment”, edited by Valentina Krysanova, Fred Hattermann and Zbigniew Kundzewicz

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Mishra, V., Shah, H., López, M.R.R. et al. Does comprehensive evaluation of hydrological models influence projected changes of mean and high flows in the Godavari River basin?. Climatic Change 163, 1187–1205 (2020). https://doi.org/10.1007/s10584-020-02847-7

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  • DOI: https://doi.org/10.1007/s10584-020-02847-7

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