active permafrost

基本解释

The thermal offset and permafrost table temperature are important energy indexes in studying permafrost active layers and frost soil environment.
溫度位移和多年凍土頂板溫度是活動層研究和凍土環境研究中重要的能量指標。
There are a lot of active measures to protect permafrost adopted in the construction of the Qinghai-Tibet Railway and the Qinghai-Tibet Highway, of which an effective one is awning.
在青藏鉄路和青藏公路的施工建設中，許多主動保護凍土的措施已經被採用，遮陽板就是其中有傚的降溫措施之一。
In seasonally frozen ground regions as well as permafrost regions, active layer is the most active terrane in terms of thermodynamics.
活動層夏季融化、鼕季凍結的近地表土（巖）層，是凍土地區熱力動態最活躍的巖層，在凍土研究中有著重要意義。