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A Visualized Computation Method for Glacier Variation

HE Chunyang( Resources Science Institute of Beijing Normal University, Beijing 100875) DING Yongjian; LI Xin (Lanzhou Institute of Glaciology and Geocryology, CAS, Lanzhou 730000)  
A new method, visualized method GIS-based, for computing glacier variation is put forward. The Glacier No.1 at the headwaiers of theUrumqi River, Tianshan Mountains, is taken as an example. By tradition. pole method was widely used,whose substance is estimating mass balance for a whole glacier from a few typical and discrete records.Therefore calculated result depends on sampling number, accuracy and representative. The visualized method continuously simulates the change of glacier surface through grid data of DEM and computes glacier variation in a certain duration. The method needs digitized glacier map in different duration or remote sensing data or direct measurement using Global Position System (GPS). As compared with traditional polemethod and calculation method (isoline method), the visualized method has quick, visual and economic advantages and may be realized through remote sensing (RS) and GPS technique. In this paper the principle,process and computing program of the visualized method are discussed. A satisfied result is obtained as applying this method to the Glacier No.1 at the headwaiers of the Urumqi River. The computation result is compared with measured mass balance. In the compared duration from 1980 to 1986, the height of glacier surface and ice volume computed by the visualized method decreased about 1 653 mm and 2.87×106 m3 and those by traditional method decreased 1961 mm and 3.61×106 m3. If measured specific mass balance is corrected based on glacier area change, then the height of glacier surface and ice volume computed by traditional method should decrease 1849 mm and -3.30×106 m3. It is also found that there is a close relation between the visualized method and pole method. The causes of error have been analyzed. Most of error come from measurement and calculation of mass balance. Partial error is caused by digitized DEM and visualized computation. In general, this study is concerned with the application of 3S technique to glaciology. The purpose is now focused on methodology. The method provides a route for study of glacier variation using 3S technique.
【Fund】: 中国科学院特别经费支持项目
【CateGory Index】: P343.6
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