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新疆天格尔山末次冰期冰川的分布特征研究
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摘要
以《天山天格尔峰区末次冰期冰川分布图》为基础资料,本文结合DEM数据,利用ArcGIS提取天格尔山地区的高程、坡度、坡向、现代冰川分布范围、末次冰期冰川分布范围及其物质平衡线高度。对提取的数据进行相关性分析,分别比较南北坡和以冰川面积中位数划分的两部分冰川,并结合平衡线高度计算方法,探讨研究区末次冰期冰川分布的面积、坡度、坡向和平衡线比值等特征以及与其它地区的差异。
     研究表明:研究区末次冰期早中冰阶的冰川类型大多属于山谷冰川和复式山谷冰川,个别属于树枝状山谷冰川;乌鲁木齐河源地区末次冰期早中冰阶发育的冰川与其在末次冰盛期发育的冰川相比,不仅积累区面积比值大,而且积累区面积也大;与青藏高原及其周边山地(主要是高原西南部和南部)的末次冰盛期平衡线特征相比,天格尔山区末次冰期早中冰阶发育的冰川更偏向于大陆性冰川特征;坡度较小、面积较大的冰川,AAR值(积累区面积比值)相对较小,且与THAR值(冰川末端-冰斗后壁比值)、TSAM值(冰川末端-最高峰高差比值)、H fer值(冰川末端-分水岭平均高度比值)具相对较好的相关性;采用的数据处理方法,其结果与其他研究资料得到的结果基本吻合。
The elevation, slope, aspect, the distribution of modern glaciers, the range of the LastGlacier glaciers and its material equilibrium line altitude in the Tianger Mountain wereinvestigated by ArcGIS on the base of DEM date and the” the distribution of the glacier in theTianger Mountain during the Last Glacial”. In this research, we analyzedthe correlation of thesedata,comparison between southern and northern slope and between two types divided by themedian area value. Then we discussed the distribution, slope, aspect, and ratio of the equilibriumline of the Last Glacial in the Tianger Mountain and compared them with other areas.
     The results suggested that valley glaciers and duplex valley glaciers were the major type ofthe Tianger Mountain area during the early and middle stages of the Last Glacial, and there werea few dendritic valley glaciers. In the headwater of Urumqi River, the early and middle stages ofthe Last Glacial not only had a higher ratio of accumulation area, but also had a larger area andmore continental features compared with the Last Glacial Maximum. Compared with the LastGlacial Maximum equilibrium line characteristics of the Qinghai-Tibet Plateau and its surroundingmountains, mainly in the south and southwest of the plateau, the glaciers of the TiangerMountain area during the early and middle stages of the Last Glacial were more continental. TheAAR value of the glaciers with smaller slope and larger area is relatively smaller, and had arelatively better correlation with THAR value, TSAM value and H fer value. The data results fromthis processing method basically meet those results in other studies.
引文
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