The data are a digitized permafrost map along the Qinghai-Tibet Highway (1:600,000) (Boliang Tong, et al. 1983), which was compiled by Boliang Tong, shude Li, Jueying bu, and Guoqing Qiu from the Cold and Arid Regions Environmental and Engineering Research Institute of the Chinese Academy of Sciences (originally called the Lanzhou Institute of Glaciology and Cryopedology, Chinese Academy of Sciences) in 1981. The map aims to reflect the basic laws of permafrost distribution along the highway and its relationship with the main natural environmental factors.
The basic data for the compilation of the map include hydrogeological and engineering geological survey results and maps along the Qinghai-Tibet Highway(1:200000) (First Hydrogeological Engineering Geological Brigade of Qinghai Province, Institute of Geomechanics of the Academy of Geological Science), the cryopedological research results of the Institute of Glaciology and Cryopedology of Chinese Academy of Sciences since 1960 in nine locations along the Qinghai-Tibet Highway (West Datan, Kunlun pass basin, Qingshuihe, Fenghuohe, Tuotuohe, the Sangma Basin, Buquhe, Tumengela, and Liangdaohe) and drilling data of the Golmud-Lhasa oil pipeline and aerial topographic data of the work area. Taking the 1:200000 topographic map as the working base map, a permafrost map was compiled, which was then downscaled to a 1:600000 map to ensure the accuracy of the map. To make up for the lack of data in a larger area along the line, the characteristics and principles of the frozen soils found in the nine frozen soil research points along the highway were applied to areas with the same geologic and geographical conditions; meanwhile, aerial photographs were used as supplements to the freeze-thaw geology and frozen soil characteristics.
The permafrost map along the Qinghai-Tibet Highway (1:600,000) includes the annual average temperature contour map along the Qinghai-Tibet Highway (1:7,200,000) and the permafrost map along the Qinghai-Tibet Highway (1:600,000). The permafrost map along the Qinghai-Tibet Highway also contains information on permafrost types, lithology, frozen soil phenomena, types of through-melting zones, classification of frozen soil engineering, and geological structural fractures. These data contain only digitized permafrost information. The spatial coverage is from Daxitan on the Qinghai-Tibet Highway in the north to Sangxiong in the south and is nearly 800 kilometers long and 40-50 kilometers wide.
The data set includes a vectorized and a scanned map of the permafrost map along the Qinghai-Tibet Highway. The attribute information of the map is as follows.
A-1; Continuous permafrost; >0°C; remained as a frozen soil layer and isolation layer
A-2; Continuous permafrost; 0~-0.5°C; 0-25 m
A-3; Continuous permafrost; -0.5~-1.5°C; 25-60 m
A-4; Continuous permafrost; -1.5~-3.5°C; 60-120 m
A-5;Continuous permafrost;<-3.5°C;>120 m
B-1; Island permafrost ground; Seasonal Frozen Ground;
B-2; Continuous permafrost; >0°C; remained as a frozen soil layer and isolation layer
B-3; Island permafrost extent; 0~-0.5°C; 0-25 m
B-4; Island permafrost extent; -0.5~-1.5°C; 25-60 m
B-5; Island permafrost extent; -1.5~-3.5°C; 60-120 m
|collect time||1981/01/01 -|
|data size||3.1 MiB|
The basic data for the preparation of the map include: 1:200000 hydrogeological and engineering geological survey and map along the Qinghai Tibet highway (the first hydrogeological and engineering geological team of Qinghai Province, Institute of geomechanics, Academy of Geosciences); Institute of glacial and glacial soil, Chinese Academy of Sciences, since 1960, in Xidatan, kunlunshanyakou basin, Qingshuihe, Fenghuoshan, Tuotuohe and sanglun along the Qinghai Tibet highway The research results of permafrost in nine places including Ma basin, Buqu River, tumengra and Liangdao River, the drilling data of Golmud Lhasa oil pipeline and the aerial topographic data of the working area. With 1:20000000 topographic map as working base map, the permafrost map is compiled, and then reduced to 1:600000 to ensure the accuracy of the map. In order to make up for the lack of data in a wider range along the road, the characteristics of frozen soil on nine frozen soil research points along the road are applied to the sections with similar geological and geographical conditions, and the geological process of freezing and thawing and the characteristics of frozen soil in the mapping area are supplemented by aerial photos.
Data set quality control through strict manual audit
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