active permafrost

基本解釋

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(dòng)層研究和凍土環(huán)境研究中重要的能量指標(biāo)。
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.
在青藏鐵路和青藏公路的施工建設(shè)中，許多主動(dòng)保護(hù)凍土的措施已經(jīng)被采用，遮陽(yáng)板就是其中有效的降溫措施之一。
In seasonally frozen ground regions as well as permafrost regions, active layer is the most active terrane in terms of thermodynamics.
活動(dòng)層夏季融化、冬季凍結(jié)的近地表土（巖）層，是凍土地區(qū)熱力動(dòng)態(tài)最活躍的巖層，在凍土研究中有著重要意義。