Vinnarasi Rajendran

Assistant Professor, Department of Civil Engineering, IIT Roorkee ·
Research Interests

Hydro-climatological Extremes
Hydrological Hazard
Multivariate Hydrological Analysis
Detection and Attribution of Extreme Events
Regional Hydrological Modelling
Water Accounting
Climate and Ecological Resilience


Journal Articles

  1. Vinnarasi, R. and Dhanya C. T. (2019). Quantifying the shifts and intensification in the annual cycles of diurnal temperature extremes for human comfort and crop production. Environmental Research Letters. DOI: 10.1088/1748-9326/ab0fe5
  2. Vinnarasi, R. and Dhanya C. T. (2019). Bringing realism into a dynamic copula-based non-stationary intensity-duration model. Advances in Water Resources. DOI: 10.1016/j.advwatres.2019.06.009
  3. Ghodichore, N, Vinnarasi, R., Dhanya, C. T. and Roy, S. B. (2018). Reliability of reanalyses products in simulating precipitation and temperature characteristics over India. Journal of Earth System Science. DOI: 10.1007/s12040-018-1024-2
  4. Chaudhary, S., Dhanya, C. T. and Vinnarasi, R. (2017). Dry and Wet Extreme Spell Variability During Monsoon in Gauge-Based Gridded Daily Precipitation Datasets over India. Journal of Hydrology. DOI: 10.1016/j.jhydrol.2017.01.023
  5. Ghodichore N., Dhanya C.T. and Vinnarasi R. (2017). Examination of Mean Precipitation and Moisture Transport in Reanalysis Products over India. ISH Journal of Hydraulic Engineering. DOI: 10.1080/09715010.2017.1364983
  6. Vinnarasi, R., Dhanya, C. T., Chakravorty, A. and Aghakouchak, A. (2017). Unravelling Diurnal Asymmetry of Surface Temperature in Different Climate Zones. Scientific Reports. DOI: 10.1038/s41598-017-07627-5
  7. Vinnarasi, R. and Dhanya, C. T. (2016). Changing characteristics of extreme wet and dry spell of Indian rainfall. Journal of Geophysical Research Atmospheres. DOI: 10.1002/2015JD024310

Book Chapter

  1. Vinnarasi, R. and Sarma, A. K. (2018). Climate Change Consideration in Planning and Development of Semi-Urban Area (Chapter). 9783319744940, 3319744941 Springer


  1. Vinnarasi, R., Dhanya, C. T. and Chaudhary, S. (2020). Covariate based Time-Varying Intensity-Duration-Frequency Curve for Changing Climate. EGU General Assembly 2019. Place: Vienna, Austria
  2. Vinnarasi, R. and Dhanya, C. T. (2020). Time-Varying Meteorological Drought Index for a Changing Climate. EGU General Assembly 2020. DOI: 10.5194/egusphere-egu2020-621 Place: Vienna, Austria
  3. Vinnarasi, R., Dhanya, C. T. and Kumar, H. (2018). Copula-Based Non-Stationary Joint Deficit Index for Drought Characterization. AGU-Fall Meeting 2018. Place: Washington D.C., USA
  4. Vinnarasi, R. and Dhanya, C. T. (2018). Event Based Intensity-Duration Model for Changing Climate. EGU General Assembly 2018. Place: Vienna, Austria
  5. Vinnarasi, R., Chakravorty, A., Dhanya, C. T. and Aghakouchak, A. (2016). Evolution of Diurnal Asymmetry of Surface Temperature over Different Climatic Zones. AGU-Fall Meeting 2016. Place: San Francisco, USA
  6. Chakravorty, A., Vinnarasi, R. and Dhanya, C. T. (2016). Feasibility of Multidecadal Satellite Soil Moisture for Drought Monitoring over India. AGU-Fall Meeting 2016. Place: San Francisco, USA
  7. Ghodichore, N., Dhanya, C. T. and Vinnarasi, R. (2016). Performance Evaluation of Reanalysis Products in Simulating the Hydrological Cycle Over India. HYDRO-2016. Place: IIT Roorkee
  8. Vinnarasi, R. and Dhanya, C. T. (2016). Evolution of Extreme Temperature Events under Changing Climate. Asia Oceania Geosciences Society (AOGS) 13th Annual Meeting. Place: Beijing, China
  9. Vinnarasi, R., Dhanya, C. T. and Devak M. (2015). Examining Spatio-Temporal Intensity-Frequency Variations in Extreme Monsoon Rainfall using High Resolution Data. AGU-Fall Meeting 2015. Place: San Francisco, USA
  10. Dhanya, C. T. and Vinnarasi, R. (2015). On a Phase Space Reconstruction Approach to Improve the Statistical Downscaling of Regional Precipitation. AGU-Fall Meeting 2015. Place: San Francisco, USA
  11. Vinnarasi, R. and Dhanya, C. T. (2015). Changes in the Characteristics of Extreme Rainfall in Indian Monsoon”, in Proceedings of International Conference on Agriculture. Food Engineering and Environmental Sciences- Sustainable Approaches. Place: New Delhi, India
  12. Jain, A., Vinnarasi, R. and Dhanya, C. T. (2015). Intensity-Duration-Frequency Relationship using Event Based Approach. International Conference on Agriculture, Food Engineering and Environmental Sciences- Sustainable Approaches. Place: New Delhi, India
  13. Vinnarasi, R., Dhanya, C. T. (2015). Spatio-Temporal Variations of Precipitation Extremes in India. Proceeding of the International Conference on Hydraulics, Water Resources and River Engineering (HYDRO-2015). Place: Roorkee
  14. Vinnarasi, R., Sarma, A. K. (2012). Statistical Downscaling of GCM for Predicting Seasonal Rainfall with Short Duration Historical Data. Proceedings of 2nd International Conference on Advances in Mechanical, Manufacturing and Building Sciences (ICAMB – 2012). Place: SMBS, VIT Univertisy, Vellore, India
  15. Vinnarasi, R. and Sarma A. K. (2012). Climate Change Consideration of Planning and Management for Semi-Urban Area. International Conference on Environmentally Sustainable Urban Ecosystems (ENSURE 2012). Place: Guwahati, Assam, India

Research Group

Current Students

  1. Dikshant Bodana
  2. Ritesh Moon
M. Tech.
  1. Harshal Shende
  2. Aman Gupta

Project Staff

  1. Vijay Lakshmanan (Project Assistant, HiROS)

Research Projects

  1. Hindon Roots Sensing (HiROS): River Rejuvenation through Scalable Water and Solute Balance Modelling and Informed Farmer's Actions
  2. Sponsor: DST, New Delhi under Indo Dutch DST-NWO Cleaning Ganga and Agri Water Call
    Sanctioned Year: 2021
    Amount: ₹ 457.96 Lakhs
    Role: PI
  3. Regional Hydrological Modelling for Dynamic Catchment
  4. Sponsor: SRIC, IIT Roorkee
    Sanctioned Year: 2021
    Amount: ₹ 20 Lakhs
    Role: PI

Open Positions


Click here for more details.

HiROS Project

  1. Post Doc: Apply here
  2. Check here for more details
  3. JRF: Apply here
  4. Check here for more details

Courses Taught

  1. CEN-108: Fluid Mechanics
  2. CEN-534: Modelling and Simulation

Accelerate Vigyan Internship (Vritika)

Unravelling the Cause and Evolution of Meteorological Drought in India Under Changing Climate


Meteorological drought is the initial stage of drought, and the prolonged duration of meteorological drought leads to agricultural, hydrological, and socio-economic droughts. The major hydrological component which causes meteorological drought is rainfall. One of the familiar indices used to extract meteorological drought characteristics is the standard precipitation index (SPI), which is developed on the basic assumption of stationary (i.e., the statistical properties do not change over time) climate. However, numerous studies proved that the statistical properties of precipitation have changed. Hence, the stationary assumption used in SPI is no longer reliable and cannot trace the changing characteristics of drought. Recently more attention is given to the development of a nonstationary drought index. The major drawback of the nonstationary drought index is the uncertainty about future prediction and the lack of knowledge about the physical processes (Climate-informed covariates) behind the changes. Moreover, the spatio-temporal evolution of meteorological drought over India is still not established. Hence, this study aims to understand the cause and effect of meteorological drought and re-examine the meteorological drought severity trend by extracting the drought characteristics using a nonstationary drought index. The following objectives are formulated to achieve this goal:

  1. Identifying the causal factors for time-varying drought characteristics
  2. Spatio-temporal evolution of time-varying meteorological drought over India

Benefit for Interns

Interns will be introduced to the new research world of non-stationarity. By the end of this internship, the student will be well versed in programming language and stochastic hydrology.


  1. Regular students pursuing their PG (M. Tech./ME/MS) in University/Institution within India.
  2. Specialization: Water Resources Engineering, Water Resources Management, Hydrology, and related domains
  3. Demonstrate interest in research and has strong analytical skills
  4. Knowledge of MATLAB

How to apply

  1. Please fill the form @
  2. The last date for application is 5th May 2022
  3. The selected interns will be intimated on or before 7th May 2022.
  4. The selected interns should produce a “No Objection Certificate (NOC)” from their Supervisor / Head of the Department / Head of the Institute allowing their student to undergo internship.


  1. Number of interns required: 2
  2. Outstation candidates will be eligible for TA
  3. Each intern will be supported with daily necessary expenses such as stationery, consumables, accommodation, food, etc., up to Rs. 30000 for the whole internship period.
  4. No stipend will be provided for the internship
  5. After completion, the intern will be awarded a certificate


Room No. 228
Department of Civil Engineering
Indian Institute of Technology Roorkee
Roorkee - 247667
Haridwar District, Uttarakhand