In the north, where forests fade into frozen ground, the influence of tradition and folklore is strong.

在北方，森林逐漸消失為冰凍的土地色区在线，在這里男士免费黄网，傳統(tǒng)和民俗有很深的影響

In the north, where forests fade (2) into frozen ground, the influence of tradition and folklore (3) is strong.

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The local factors such as topography, vegetations and soil moisture contents, have great influences on the distribution, ground temperatures, and ground ice contents of permafrost. About 50 km of wetlands have been identified along the China-Russia crude oil pipeline route. In these segments, the surficial deposits consist of peat and humic layers on the top of thick ground-ice, or ice-rich permafrost. The frozen ground engineering geology conditions in wetlands generally are the worst for building and operating the pipeline. The hazardous periglacial processes, such as the widespreadpresence of pingos, icings and frost mounds due to the extensive occurrence of the frost-susceptible soils and ample supplies of surface and ground waters in winter pose significant threats on pipeline operation.

地形地貌單元一级a黄色视频在线99、植被分布、地表水分條件的變化等局部因素對多年凍土的分布和地下冰的賦存產(chǎn)生重要的影響AV第页几久，管道沿線大約分布有50 km左右的沼澤濕地中国美女一级婬片A片免费播放，其表層為腐殖質(zhì)土及泥炭層，泥炭層下面分布著含土冰層或地下冰久久99久久2，是管道沿線最差的凍土工程地質(zhì)地段3d无码h；由于中俄原油管道沿線水系發(fā)育多，凍脹丘免费一级A片毛毛片在线播放i、冰椎和冰幔等不良凍土現(xiàn)象廣泛分布免费AⅤ网址在线播放。

perennially frozen ground：長期凍土

perennial stream 常劣 | perennially frozen ground 長期凍土 | perfect crystal 完整晶體

perennially frozen ground：永凍地

壅塞處 choke | 永凍地 perennially frozen ground | 永凍面 permafrost table

seasonally frozen ground：季節(jié)性凍土

多年凍土地區(qū):Perennially frozen soil zone | 季節(jié)性凍土:seasonally frozen ground | 凍土隧道:tunnel in frozen earth