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Evaluating the Performance of CHIRPS Satellite Rainfall Data for Streamflow Forecasting

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Abstract

Streamflow forecasting can offer valuable information for optimal management of water resources, flood mitigation, and drought warning. This research aims in evaluating the effectiveness of CHIRPS satellite rainfall data in comparison with IMD gridded Rainfall Data and development of various flow forecasting models. Daily rainfall data for three decades (1983–2012) over the Nethravathi Basin, Karnataka, India is used for analysis. The analysis is carried out for the monsoon season (June–September), out of which 70% data considered for training the model and remaining for testing. Different input combinations are developed, and soft-computing methods like ANFIS, GRNN, PSO-ANN, and ELM are applied for flow forecasting on a temporal scale. The model performance is evaluated using various statistical indices like NNSE, RRMSE, and MAE. The results indicate that CHIRPS rainfall showed better performance in comparison with IMD data. ELM expressed an enhanced effect when compared to all other methods. The usefulness and effectiveness of CHIRPS data compared to IMD data has been explored.

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Acknowledgments

The authors would like to acknowledge the Department of Applied Mechanics and Hydraulics, National Institute of Technology Karnataka Surathkal, India, for providing infrastructural support. The authors are thankful to Mr. Sujay Raghavendra Naganna, Associate Professor, Shri Madhwa Vadiraja Institute of Technology and Management, Udupi, for providing inputs on hydrological modeling and Mr. Surajit Deb Barma, Research Scholar, NITK Surathkal for helping out to download CHIRPS rainfall data by scripting using Google Earth Engine.

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Correspondence to Bhuvanamitra Sulugodu.

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Sulugodu, B., Deka, P.C. Evaluating the Performance of CHIRPS Satellite Rainfall Data for Streamflow Forecasting. Water Resour Manage 33, 3913–3927 (2019). https://doi.org/10.1007/s11269-019-02340-6

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  • DOI: https://doi.org/10.1007/s11269-019-02340-6

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