青藏公路沿线1：60万多年冻土图（1983）

该数据是对青藏公路沿线多年冻土图（1：60万）（童伯良 等，1983）的数字化，青藏公路沿线多年冻土图是1981年由中国科学院寒区旱区环境与工程研究所（原中国科学院兰州冰川冻土研究所）童伯良、李数德、卜觉英、邱国庆等编制的，其目的在于反映公路沿线多年冻土层分布的基本规律及其与主要自然环境因素的生成关系总貌。 编制该图的基础资料包括有：青藏公路沿线1：200000水文地质和工程地质调查和图件（青海省第一水文地质工程地质大队、地质科学院地质力学所）；中国科学院冰川冰土研究所自1960年以来在青藏公路沿线的西大滩、昆仑山垭口盆地、清水河、风火山、沱沱河、桑马盆地、布曲河、土门格拉、两道河等九个地点的冻土研究成果；格尔木—拉萨输油管线的钻探资料以及工作区的航测地形资料。以1：200000万地形图当工作底图，编绘成多年冻土图，再缩编成1：600000的成图，以保证图的精确性。为了弥补沿线更大范围内资料的不足，把公路沿线九个冻土研究点上探明的冻土特征规律应用于地质地理条件类同的地段，同时利用航片补充编图区的冻融地质作用和冻土特征。 青藏公路沿线多年冻土图（1：60万）包括青藏公路沿线年平均气温等值线图（1：720万）和青藏公路沿线多年冻土图（1：60万），其中青藏公路沿线多年冻土图中又包含多年冻土类型、岩性、冻土现象、贯通融区类型、冻土工程分类、地质构造断裂等信息。本数据仅对多年冻土信息进行了数字化，其空间范围北起青藏公路的大西滩，南至桑雄，长达近800公里，宽约40-50公里。 本数据集包括：矢量化的青藏公路沿线多年冻土图和《青藏公路沿线多年冻土图》扫描图，其中青藏公路沿线多年冻土图的属性信息如下： A-1;Continuous permafrost;大片多年冻土区;>0°C;残留多年冻土层、隔年层 A-2;Continuous permafrost;大片多年冻土区;0~-0.5°C;0-25m A-3;Continuous permafrost;大片多年冻土区;-0.5~-1.5°C;25-60m A-4;Continuous permafrost;大片多年冻土区;-1.5~-3.5°C;60-120m A-5;Continuous permafrost;大片多年冻土区;<-3.5°C;>120m B-1;Island permafrost ground;岛状多年冻土;季节冻土(Seasonal Frozen Ground); B-2;Continuous permafrost;大片多年冻土区;>0°C;残留多年冻土层、隔年层 B-3;Island permafrost extent;岛状多年冻土区;0~-0.5°C;0-25m B-4;Island permafrost extent;岛状多年冻土区;-0.5~-1.5°C;25-60m B-5;Island permafrost extent;岛状多年冻土区;-1.5~-3.5°C;60-120mThis dataset is the digitization of the Permafrost Map along the Qinghai-Tibet Highway (1:600,000 scale) (Tong et al., 1983). This map was compiled in 1981 by Tong Boliang, Li Shude, Bu Jueying, Qiu Guoqing, et al. from the Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences (formerly Lanzhou Institute of Glaciology and Geocryology, Chinese Academy of Sciences), aiming to reflect the general pattern of permafrost distribution along the Qinghai-Tibet Highway and its genetic relationship with major natural environmental factors. The basic data used for compiling this map include: 1:200,000 scale hydrogeological and engineering geological surveys and maps along the Qinghai-Tibet Highway (No. 1 Hydrogeological and Engineering Geological Team of Qinghai Province, Institute of Geomechanics, Chinese Academy of Geological Sciences); permafrost research achievements from 1960 onward at nine sites along the Qinghai-Tibet Highway (Xidatan, Kunlun Pass Basin, Qingshuihe, Fenghuoshan, Tuotuohe, Sangma Basin, Buqu River, Tumen Gela, Liangdaohe) by the Lanzhou Institute of Glaciology and Geocryology, Chinese Academy of Sciences; drilling data from the Geermu-Lhasa Oil Pipeline; and aerial topographic survey data of the working area. The permafrost map was compiled using 1:200,000 scale topographic maps as the working base, then reduced to the final 1:600,000 scale map to ensure mapping accuracy. To compensate for the lack of data in larger areas along the highway, the confirmed permafrost characteristics and rules from the nine permafrost research sites along the highway were applied to sections with similar geo-environmental conditions, while aerial photographs were used to supplement freeze-thaw geological processes and permafrost characteristics in the mapping area. The Permafrost Map along the Qinghai-Tibet Highway (1:600,000 scale) includes the Mean Annual Temperature Contour Map along the Qinghai-Tibet Highway (1:720,000 scale) and the Permafrost Map along the Qinghai-Tibet Highway (1:600,000 scale). The latter contains information such as permafrost types, lithology, permafrost phenomena, through-thaw zone types, permafrost engineering classification, and geological structural faults. This dataset only digitizes the permafrost-related information, with a spatial scope extending from Daxitan along the Qinghai-Tibet Highway in the north to Sangxiong in the south, covering a length of nearly 800 km and a width of approximately 40-50 km. This dataset includes the vectorized Permafrost Map along the Qinghai-Tibet Highway and the scanned version of the *Permafrost Map along the Qinghai-Tibet Highway*. The attribute information of the vectorized permafrost map is as follows: A-1; Continuous permafrost; Extensive continuous permafrost zone; >0°C; Residual permafrost and interannual frozen layers A-2; Continuous permafrost; Extensive continuous permafrost zone; 0~-0.5°C; 0-25m A-3; Continuous permafrost; Extensive continuous permafrost zone; -0.5~-1.5°C; 25-60m A-4; Continuous permafrost; Extensive continuous permafrost zone; -1.5~-3.5°C; 60-120m A-5; Continuous permafrost; Extensive continuous permafrost zone; <-3.5°C; >120m B-1; Island permafrost ground; Insular permafrost zone; Seasonal Frozen Ground B-2; Continuous permafrost; Extensive continuous permafrost zone; >0°C; Residual permafrost and interannual frozen layers B-3; Insular permafrost extent; Insular permafrost zone; 0~-0.5°C; 0-25m B-4; Insular permafrost extent; Insular permafrost zone; -0.5~-1.5°C; 25-60m B-5; Insular permafrost extent; Insular permafrost zone; -1.5~-3.5°C; 60-120m