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Developing Intensity-Duration-Frequency (IDF) curves using GPM-IMERG v6 data: A Case Study from South India
  • Venkatesh Kasi,
  • Maheswaran Rathinasamy,
  • Deva Jarajapu
Venkatesh Kasi
School of Infrastructure, Indian Institute of Technology (IIT) Bhubaneshwar, India

Corresponding Author:20wr06009@iitbbs.ac.in

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Maheswaran Rathinasamy
Department of Civil Engineering, Indian Institute of Technology (IIT) Hyderabad, India
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Deva Jarajapu
Department of Hydrology and Climatology, University of Potsdam, Germany
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With the availability of satellite-based precipitation products, it is pertinent to develop methods to use these data products for the purpose of design of hydraulic structures. The satellite precipitation products play a vital role in ungauged locations or when information is required a catchment scale. Prior to such applications, the accuracy and uncertainty associated with the products have to be investigated. This study compares Intensity Duration Frequency (IDF) curves using the recent precipitation product Global Precipitation Measurement (GPM-IMERG V6) with ground-based gauge data over the southeastern part of India and quantifies the uncertainty associated. Further, for comparison, a bias-corrected dataset is used in the study to understand the implication of bias correction of the satellite product in the IDF generation. The spatial correlation between the satellite IDF and the gauge-based IDF improves significantly after bias correction and the value is as high as 0.75 for 2- 10 year return period. The bias between the satellite IDF and gauge IDF is low in the north part of the study region and is high in the southeastern part, prone to extreme rainfall. Further, a significant percentage of the satellite-based IDFs (with and without bias correction) lie inside the confidence interval of the gauge-based data.