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Impact of land-use changes on the genesis and evolution of extreme rainfall event: a case study over Uttarakhand, India

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Abstract

This study is about the impact assessment of different land-use data sets on the simulation of an Extreme Rainfall Event (ERE) which is one of the unusually rare events that occurred between 14th to 18th of June 2013 over Uttarakhand in India. In this work, high-resolution (2-km), time ensemble simulations are carried out using Weather Research and Forecasting model (WRFV3.5) with a 3-nest configuration. The sensitivity analysis of the model in simulating rainfall to different land-use data i.e. USGS-24 category (1992–93), ISRO (2004–05) and (2012–13) are carried out. Comparison of simulated rainfall which is averaged over the study region with that of IMD observed station data (averaged over 23 stations) showed that the simulations based on ISRO land-use data are comparatively more accurate with lesser simulation error when compared to simulations with USGS land-use data. The percentage of error in rainfall for the 3 simulations was found to be 24% (USGS), 9.5% (ISRO-2005) and 10% (ISRO-2013) with respect to the IMD observation. During the initial stage, the results have shown maximum convergence and vorticity with a strong updraft. The strong updraft, however, persisted throughout the simulation period. The increasing tendency of positive vorticity both in the simulation and observation suggests an intensification of cyclonic circulation in a vertical direction and hence creates instability in the boundary layer causing ERE over Uttarakhand. This study shows that ISRO land-use data is a relatively more realistic representation of the study region than the USGS data, and found to be useful in reducing the model error in the simulation of such rare events over this kind of mountainous region.

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Acknowledgments

This work is supported by the projects funded by the Department of Science and Technology (Grant number: SB/S4/AS-113/2013 and SB/S4/AS-120/2014), Govt. of India and another project funded under National Mission on Himalayan Studies (NMHS) of Ministry of Environment, forest and climate change, Govt. of India (grant no: GBPNI/NMHS-2019-20/MG/315). The CSIR 4PI high-performance computing (HPC) facility used for computing is acknowledged gratefully. The authors acknowledge Head, CSIR 4PI for support and encouragement. Authors acknowledge National Center for Atmospheric Research (NCAR) for making Weather Research and Forecast (WRF) modelling system open for researchers and National Centers for Environmental Prediction (NCEP) for providing the analysis data used for simulation in this study. Authors also acknowledge USGS Global Land Cover Characterization (GLCC) and Indian Space Research Organization for making available the Land use and Land cover (LULC) data. Rainfall data from TRMM satellite and India Meteorological Department (IMD) observations are also highly acknowledged.

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Correspondence to K C Gouda.

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Sahoo, S.K., Ajilesh P P, Gouda, K.C. et al. Impact of land-use changes on the genesis and evolution of extreme rainfall event: a case study over Uttarakhand, India. Theor Appl Climatol 140, 915–926 (2020). https://doi.org/10.1007/s00704-020-03129-z

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  • DOI: https://doi.org/10.1007/s00704-020-03129-z

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