Assessment of Heavy Rainfall using GPM- IMERG Satellite Product over Nepal

Authors

  • Nirmala Regmi Tribhuvan University, Kirtipur, Nepal
  • Bikash Nepal Department of Hydrology and Meteorology (DHM), Government of Nepal, Kathmandu, Nepal
  • Shankar Sharma Tribhuvan University, Kirtipur, Nepal
  • Dibas Shrestha Tribhuvan University, Kirtipur, Nepal
  • Govind Kumar Jha Department of Hydrology and Meteorology (DHM), Government of Nepal, Kathmandu, Nepal

DOI:

https://doi.org/10.3126/jalawaayu.v1i2.41015

Keywords:

Satellite, IMERG, Extreme rainfall, Nepal, MODE

Abstract

This study evaluates the Integrated Multi-satellite Retrievals from Global Precipitation Measurement (IMERG) final product’s ability to represent the extreme precipitation against 310 observations from Nepal between 2015 and 2017. Additionally, Method of Object-based Diagnostic Evaluation (MODE) analysis was also performed to analyze IMERG ability to capture actual spatial distribution of the rainfall extremes. Both datasets show the extreme rainfall events are mostly concentrated at southern low land areas of the country. MODE tool further revealed the slight shifting of heavy precipitation location by IMERG product as compared to observation. It is also noted that, as precipitation intensity increases (threshold values of rainfall), the number of extreme events decreases. Moreover, this work provides a systematic quantification of the performance of IMERG gauge calibrated product and its applicability in extreme precipitation over mountainous region.

Downloads

Download data is not yet available.
Abstract
50
PDF
4

Author Biographies

Nirmala Regmi, Tribhuvan University, Kirtipur, Nepal

Central Department of Hydrology and Meteorology (CDHM) and Department of Hydrology and Meteorology (DHM), Government of Nepal, Kathmandu, Nepal

Shankar Sharma, Tribhuvan University, Kirtipur, Nepal

Central Department of Hydrology and Meteorology (CDHM)

Dibas Shrestha, Tribhuvan University, Kirtipur, Nepal

Central Department of Hydrology and Meteorology (CDHM)

Downloads

Published

2021-12-02

How to Cite

Regmi, N., Nepal, B., Sharma, S., Shrestha, D., & Jha, G. K. (2021). Assessment of Heavy Rainfall using GPM- IMERG Satellite Product over Nepal. Jalawaayu, 1(2), 79–95. https://doi.org/10.3126/jalawaayu.v1i2.41015

Issue

Section

Research Article