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Evaluating the performance of MIKE NAM model on rainfall–runoff in lower Gangetic floodplain, West Bengal, India

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Abstract

Any hydrological model can be used to plan and evaluate the water resources of a particular basin and provide a comprehensive idea of flood disasters. In this article, the MIKE NAM model in the MIKE HYDRO RIVER environment is used as a long-term plan to integrate rainfall–runoff analysis with the hydrodynamic condition through the flood region, encompassing the Bhagirathi–Hooghly river. The model is calibrated (2005–2014) and validated (2015–2018) based on the rainfall–runoff amount, including water level and runoff discharge. The acceptance and applicability of the model parameters are also examined through sensitivity analysis. This region faces constant flooding due to the whimsy weather, rainfall, and urban congested development. The calibrated result creates a fairly good relationship with the simulated data, measured using EI, R2, RMSE, and PBIAS values. This model also gives a good idea of the region’s water balance, and parameters such as CQOF, CK 1,2, and Lmax are very sensitive for high runoff discharge in this region. Although a strong relationship between high and low runoff discharges is developed through the MIKE NAM model, this model does not directly address the possibility of flooding. The NAM model explores the future flood control system through various government policies, ranging from high runoff discharge periods to flood periods.

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Acknowledgements

The authors show sincere gratitude to Kolkata port trust (hydrography section) and Irrigation and Waterways Directorate, Government of West Bengal for providing the hydro dynamic, past bathymetric and discharge data of the sub-catchment section (Nabadwip-Kalyani stretch) of Bhagirathi–Hooghly River. The authors acknowledge the technical support provided by DHI India regarding MIKE HYDRO RIVER hydrodynamic and NAM model on basis of student license. The authors also acknowledge the Digital Library of School of Water Resources Engineering, Jadavpur University, for allowing access all the GIS and statistical software.

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Correspondence to Malabika Biswas Roy.

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Ghosh, A., Roy, M.B. & Roy, P.K. Evaluating the performance of MIKE NAM model on rainfall–runoff in lower Gangetic floodplain, West Bengal, India. Model. Earth Syst. Environ. 8, 4001–4017 (2022). https://doi.org/10.1007/s40808-021-01347-6

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  • DOI: https://doi.org/10.1007/s40808-021-01347-6

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