CHANGE MONITORING OF BHAGIRATHI ALAKHNANDA BASIN GLACIER USING SATELLITE IMAGE

摘要

The history of glacier length fluctuations serves as a reliable indicator of the past climate. In this paper, a numerical flow line model has been used to study the relationship between length variations of the Himalayan glacier and local climate since 1876. The front positions of Alakhnanda & Bhagirathi area drained by a river huge mass of ice are in agreement with those followed. After a successful test run that appears to the real thing of the past retreat, the model was also used to describe a possible future event over time of the huge mass of ice for the next 100 years under different climatic situations. This work puts into numbers huge mass of ice different versions in the Alakhnanda & Bhagirathi basin area of the northern Himalaya by integrating huge mass of ice existing in satellite data from IRS LISS and Landsat series of different years, which are 2001 and 2016. Glacier variations were mapped and analysed; discrepancies between images could be detected and removed from the integrated data using remap tables in Arc/Info grid both graphically and numerically. Our results show that glaciers in the region both retreated and advanced during the last 15 years; difference between the year 2001 and 2016, average Alakhnanda & Bhagirathi basin glacier area decreased from 1.71m~2& 1.11m~2. On average, during the period 2001 and 2016 respectively, suggesting that glacier retreat has an expedition.