青藏高原北麓河附近不同地表覆被下活动层的水热差异研究

通过对青藏高原北麓河附近天然状态和工程活动状态下不同场地(砂砾路面、铲除植被、草甸地表)的活动层水热状态监测研究,对比分析了不同工程活动对场地活动层的水热传输特征和冻融过程的影响.结果表明,由于工程活动改变了场地下垫面性质,造成了不同场地活动层冻融过程、活动层厚度等的差异,进而影响了多年冻土变化.冻融期间工程活动场地活动层的水热状态变化要比天然场地强烈而且差异较大,工程活动场地冻土的稳定性比天然场地低.

Heat and Water Difference of Active Layers Beneath Different Surface Conditions near Beiluhe in Qinghai-Xizang Plateau

By monitoring the heat and water process of the active layers for some sites(included sand-gravel site,removed vegetation site and meadow site beneath the original surface and the effect of engineering activity near Beiluhe,Tibetan Plateau,the effect of engineering activity on the characteristics of heat and water transfer and of freezing and thawing are compartively analyzed.It is concluded that the freezing and thawing process and the thickness of active layers change with the changes of ground characteristics,affecting the permafrost further.The change of heat and water process of the active layers at the engineering sites is intenser than that at the original surface site,and the permafrost stability of the engineering sites is lower than that at the original surface site.