【摘要】 以位于青藏高原长江源头的各拉丹冬地区冰川为例 ,利用 2 0 0 0年的TM数字遥感影像资料、196 9年的航空相片遥感资料、地形图及数字地形模型 ,通过遥感图像处理和分析提取研究区小冰期最盛期 (LIA)、196 9年和 2 0 0 0年的冰川范围 ,并在地理信息系统技术支持下分析该地区冰川的进退情况 .研究结果表明 ,该地区 196 9年冰川面积比小冰期最盛期的冰川面积减少了 5 2 % ,2 0 0 0年的冰川面积比 196 9年的冰川面积减少了 1.7% .从 196 9年到 2 0 0 0年最大冰川退缩速度为 - 4 1.5m·a-1,最大冰川前进速度为 +2 1.9m·a-1.本区的冰川基本处于稳定状态 ,冰川退缩的速度不是太大 ,并有前进的冰川存在 .更多还原

【Abstract】 Glaciers on the Tibetan Plateau play an important role in the earths climatic system. Regular survey of glacier change is almost impossible in most parts of the plateau. Remote sensing is a primary technique and becomes the only means in many places. GIS provides an efficient tool to analyze the status and the change of glaciers. In the paper, the Geladandong area, the headwaters of the Yangtze River, was selected as the test area. Glacier variation during the Little Ice Age (LIA) maximum, in 1969 and 2000 were analyzed by means of aerial photos, satellite image, topographical map and the derived digital elevation model (DEM). The results indicate that the glacier area had decreased about 5\^2% from the Little Ice Age Maximum to 1969 and had decreased about 1.7% from 1969 to 2000. However, the glaciers seem almost steady in the test area in consideration of glacier number only.更多还原