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.
温度位移和多年冻土顶板温度是活动层研究和冻土环境研究中重要的能量指标。
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.
在青藏铁路和青藏公路的施工建设中，许多主动保护冻土的措施已经被采用，遮阳板就是其中有效的降温措施之一。
In seasonally frozen ground regions as well as permafrost regions, active layer is the most active terrane in terms of thermodynamics.
活动层夏季融化、冬季冻结的近地表土（岩）层，是冻土地区热力动态最活跃的岩层，在冻土研究中有着重要意义。