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Variations and trends of the freezing and thaw- ing index along the qinghai-xizang railway for 1966-2004

Journal of Geographical Sciences 2008年第1期18卷 3-16页

作者： JIANG Fengqing HU Ruji LI Zhen Xinjiang Institute of Ecology and Geography CAS Urumqi 830011 China

Annual freezing and thawing index of 7 meteorological stations along the Qing- hai-xizang railway were calculated based on daily maximum and minimum temperature records for 1966-2004. Trends of annual freezing and thawing index were analyzed using the Mann-Kendall test and a simple linear regression method. The results show that： 1） The mean annual freezing indices range from 95 to 2300℃·d and the mean annual thawing indices range from 630 to 3250℃·d. The mean annual freezing index of the 7 stations exhibited decreasing trends with decreasing rate of -16.6- -59.1 ℃·d/10a. The mean annual thawing index of these 7 stations showed increasing trends with the related decreasing rate is 19.83-45.6℃·d/10a. 2） The MK trend test indicated the significant decreasing trends （significant at 〈 0.05 significant level） in the annual freezing index for most stations except for Golmud. The significant increasing trends can be observed in the annual thawing index for 4 stations except Golmud and Tuotuohe. Golmud was the only station with no trends in both annual freezing and annual thawing index.

关键词： freezing and thawing index global warming trends qinghai-xizang railway

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青藏铁路多年冻土工程地质勘察(英文)

青藏铁路多年冻土工程地质勘察(英文)

引用

第六届国际多年冻土工程会议

作者：张钊 The First Survey and Design Institute of China railway State Key Laboratory of Frozen Soil Engineering CAREERICAS

The effective and assured measures in criteria of formulation,procedures,techniques and methods for geological prospecting of qinghai-xizang railway have been *** permafrost engineering geological investigation indicate the talik and those sections with annual average ground temperature higher than 1 ℃ takes up 68.8%of total amount;the high ice content permafrost also account for 50%of real permafrost *** distribution of permafrost characteristics is obviously influenced by altitude and *** prospecting also shows the distribution of permafrost characteristics is rather *** on two predications of air temperature-rising tendency,by calculating climate model of permafrost thermal status,and comparing and analyzing geological distribution of qinghai-xizang railway,the tendency of permafrost recession range has been predicated.

关键词： qinghai-xizang railway permafrost engineering geological investigation engineering geological characteristics

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