Hydrometeorological analysis of July-2023 floods in Himachal Pradesh, India

Hydrometeorological analysis of July-2023 floods in Himachal Pradesh, India

14 March 2024 | Vivek Gupta¹ · Bilal Syed¹ · Ashish Pathania¹ · Saran Raaj¹ · Aliva Nanda² · Shubham Awasthi³ · Dericks P. Shukla¹
This paper presents a hydrometeorological analysis of the July 2023 floods in Himachal Pradesh, India. The floods, which occurred between July 7-11, 2023, affected several districts and caused significant loss of life, infrastructure, and environmental damage. The study aims to understand the meteorological and hydrological factors that contributed to the flooding. Hydrometeorological data from various observation stations, along with reanalysis data from ERA5, SMAP-L4, and FLDAS-NOAH, were analyzed to identify the key factors leading to the peak floods. The study found that the combination of extremely heavy rainfall with near-saturation antecedent moisture content and snowmelt was the primary cause of the flood peak. The Himalayas, which serve as a natural barrier to moist air masses and regulate the climate of the Indian subcontinent, are particularly vulnerable to extreme weather events. The region is also a critical water source for Asia, supplying water to one-fifth of the global population. The study highlights the increasing frequency and intensity of extreme precipitation events due to climate change, which has significant implications for the region's ecosystems and communities. The analysis underscores the need for a comprehensive understanding of the multiple factors contributing to such extreme events to develop resilient solutions for flood management and damage reduction. The Himalayas have experienced various extreme disasters, including cloud bursts, flash floods, debris flows, and glacial lake outbursts, in recent decades. The study emphasizes the importance of integrating meteorological and hydrological data to better predict and manage such events.This paper presents a hydrometeorological analysis of the July 2023 floods in Himachal Pradesh, India. The floods, which occurred between July 7-11, 2023, affected several districts and caused significant loss of life, infrastructure, and environmental damage. The study aims to understand the meteorological and hydrological factors that contributed to the flooding. Hydrometeorological data from various observation stations, along with reanalysis data from ERA5, SMAP-L4, and FLDAS-NOAH, were analyzed to identify the key factors leading to the peak floods. The study found that the combination of extremely heavy rainfall with near-saturation antecedent moisture content and snowmelt was the primary cause of the flood peak. The Himalayas, which serve as a natural barrier to moist air masses and regulate the climate of the Indian subcontinent, are particularly vulnerable to extreme weather events. The region is also a critical water source for Asia, supplying water to one-fifth of the global population. The study highlights the increasing frequency and intensity of extreme precipitation events due to climate change, which has significant implications for the region's ecosystems and communities. The analysis underscores the need for a comprehensive understanding of the multiple factors contributing to such extreme events to develop resilient solutions for flood management and damage reduction. The Himalayas have experienced various extreme disasters, including cloud bursts, flash floods, debris flows, and glacial lake outbursts, in recent decades. The study emphasizes the importance of integrating meteorological and hydrological data to better predict and manage such events.
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[slides and audio] Hydrometeorological analysis of July-2023 floods in Himachal Pradesh%2C India