Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Autriche → Rezente Gletscheränderung im Einzugsgebiet des Gunts, Tadschikistan

Leopold-Franzens-Universität Innsbruck (2013)

Rezente Gletscheränderung im Einzugsgebiet des Gunts, Tadschikistan

LINDNER MARTIN

Titre : Rezente Gletscheränderung im Einzugsgebiet des Gunts, Tadschikistan

Changement récent des glaciers dans le bassin versant de Gunts, Tadjikistan

Auteur (s)  : LINDNER MARTIN

Grade  : Masterarbeit, 2013

Université : Leopold-Franzens-Universität Innsbruck

Résumé
The often discussed Aral Sea basin, which receives its substantial amount of water from the high mountains of Central Asia, is affected by water scarcity. Glaciers in the upstream area are expected to retreat due to global warming. Therefore, reliable information about past and current glaciation is essential for understanding and modelling the hydrological system. Based on a lack of mass balance data, a space based assessment of the planimetric and volumetric glacier change was performed for the catchment area of the river Gunt, Tajikistan. Multitemporal satellite imagery from the last decades (Corona KH-4B, Landsat MSS/TM, Terra ASTER and RapidEye) was classified to measure the area under change. To derive information about volumetric changes, the elevation difference between a digital terrain model based on Corona-KH4B stereo data and SRTM data was calculated. Furthermore, the ice-thickness distribution was modelled to obtain area-wide volumetric information. The results show that the glacier lost an area of 189,6km2 ( =23,7 %) between 1977 and 2011. The specific mass balance between 1977 and 1998 changed from −0,399 m a−1 water equivalent to −0,662 m a−1 in 1998-2011. The annual mass loss of 0,36 gigatonnes contributed about 12,2 % to the annual average discharge of the Gunt.

Mots Clés : Gletscher, Pamir, Zentralasien, Fernerkundung, Klimawandel, Rapideye, Landsat, Corona, ASTER, Gletschervolumen, Modellierung, Klassifizierun

Présentation (GRIN Verlag )

Page publiée le 19 juin 2021