祁连山东段宁张公路达坂山垭口段的冻土分布  

Permafrost Distribution in the Dabanshan Pass Section of Ning-Zhang Highway in Eastern Qilian Mts.

作　　者：王绍令[1] 陈肖柏[1] 张志忠[1] 

机构地区：[1]中国科学院兰州冰川冻土研究所

出　　处：《冰川冻土》1995年第2期184-188,共5页Journal of Glaciology and Geocryology

摘　　要：据观测资料表明，达坂山地区是青海省境内降水最多的地区，公路垭口段降水量大、冷季降雪多、雪层较厚，稳定积雪时间长达１８０－２００天。雪盖的保温作用占主导地位，加之局部小气候影响，使区内多年冻土下界海拔比邻近地区高约２００ｍ，年平均地温偏高，多年冻土层较薄，而且处在极不稳定的状态下。The annual precipitation in Dabanshan region is the highest in Qinghai Province,amounting to 850mm. Snowfall frequently occurs in Dabanshan pass section of the highway during the cold period. The thickness of stable snow cover in the region is generally 70-80cm and the thickest can be 200-300cm. The period with stable snow cover can be aslong as 180 -200 days. The dominant effect of snow cover insulation, accompaning by the influence of local climate, results in higher lower limit of permafrost (about 200m higher than that in nearby region), higher mean annual ground temperature. less permafrost thickness and rather unstable permafrost state in the region.

关 键 词：祁连山 宁张公路 多年冻土 积雪 冻土分布 

分 类 号：P642.14[天文地球—工程地质学]