Tahir A. A., Adamowski J. F., Chevallier Pierre, Ul Haq A., Terzago S. (2016). Comparative assessment of spatiotemporal snow cover changes and hydrological behavior of the Gilgit, Astore and Hunza River basins (Hindukush-Karakoram-Himalaya region, Pakistan). Meteorology and Atmospheric Physics, 128 (6), p. 793-811. ISSN 0177-7971.
Titre du document
Comparative assessment of spatiotemporal snow cover changes and hydrological behavior of the Gilgit, Astore and Hunza River basins (Hindukush-Karakoram-Himalaya region, Pakistan)
Tahir A. A., Adamowski J. F., Chevallier Pierre, Ul Haq A., Terzago S.
Source
Meteorology and Atmospheric Physics, 2016,
128 (6), p. 793-811 ISSN 0177-7971
The Upper Indus Basin (UIB), situated in the Himalaya-Karakoram-Hindukush (HKH) mountain ranges, is the major contributor to the supply of water for irrigation in Pakistan. Improved management of downstream water resources requires studying and comparing spatiotemporal changes in the snow cover and hydrological behavior of the river basins located in the HKH region. This study explored in detail the recent changes that have occurred in the Gilgit River basin (12,656 km(2); western sub-basin of UIB), which is characterized by a mean catchment elevation of 4250 m above sea level (m ASL). The basin's snow cover was monitored through the snow products provided by the MODIS satellite sensor, while analysis of its hydrological regime was supported by hydrological and climatic data recorded at different altitudes. The Gilgit basin findings were compared to those previously obtained for the lower-altitude Astore basin (mean catchment elevation = 4100 m ASL) and the higher-altitude Hunza basin (mean catchment elevation = 4650 m ASL). These three catchments were selected because of their different glacier coverage, contrasting area distribution at high altitudes and significant impact on the Upper Indus River flow. Almost 7, 5 and 33 % of the area of the Gilgit, Astore and Hunza basins, respectively, are situated above 5000 m ASL, and approximately 8, 6 and 25 %, respectively, are covered by glaciers. The UIB region was found to follow a stable or slightly increasing trend in snow coverage and had a discharge dominated by snow and glacier melt in its western (Hindukush-Karakoram), southern (Western-Himalaya) and northern (Central-Karakoram) sub-basins.
