From UPSC perspective, the following things are important :
Prelims level: Shift in snowfall patterns in Himachal, Rivers and glaciers located
Why in the News?
Himachal Pradesh is experiencing a reducing snow cover over the years.
There is a noticeable shift in snowfall occurrence from winter months towards early summer months.
Findings from the Latest Study:
The study by the Centre on Climate Change of Himachal Pradesh Council for Science Technology-Environment (HIMCOSTE) shows an overall decrease of 12.72% in snow cover area in 2023-24 compared to 2022-23.
The study used Advanced Wide Field Sensor (AWiFS) satellite data to analyze snow cover trends.
Early winter months (October-November) showed a decrease in snow cover area except for the Ravi basin, which showed a marginal increase in October.
Peak winter months (December-January) saw a negative trend in snow cover area.
Late winter months (February-March) showed a positive trend with an increase in snow cover area in all basins compared to the previous year.
Snow cover area increased in April due to fresh snowfall in the early summer period.
Impact on Water Availability
The decrease in snow cover during peak winter months (December and January) is especially alarming.
Snowfall during these months sustains longer and enhances the discharge dependability of major river basins during summer.
Reduced snow cover in winter could affect water availability during the summer months.
Concerns and Implications
Environmentalists and scientists are concerned about the shifting snowfall patterns.
Depleting snow cover and changing snowfall patterns have significant impacts on hydro-power, water sources, people, livestock, forests, farms, and infrastructure.
Back2Basics: Rivers of Himachal Pradesh
Description
Satluj
Originating from Rakas Lake in Tibet, the Satluj River is the longest river in Himachal Pradesh.
It flows through the districts of Kinnaur, Shimla, Kullu, Mandi, Solan, and Bilaspur, and enters Punjab near Nangal.
The river is crucial for hydropower generation and irrigation.