摘要
区域性的气候条件控制了该区季节冻土形成、发展和消亡的一般规律和特征,地貌单元是区内季节冻土发育最重要的地域分异因素,地下水埋深是细土平原上冻土发育差异的主要原因,人为活动对冻土条件影响极大。依地貌单元和地下埋深可对区内季节冻土进行冻胀的自然区划。
Based on the field data of the seasonally frozen ground during 1985-1986, the authors mainly discuss the developing characteristics of seasonally frozen ground, analyse the factors and laws influencing on the development of the seasonally frozen ground in the region of Yumenzhen, Gansu. Meanwhile, the authors put forward the frost heaving classification which is suitable for natural frozen ground conditions in this region. In addition, the division and evaluation of natural frost heaving are also proposed.
The research indicates that the reginal climatic conditions control the general laws and features of the formation development and disappearence of the seasonally frozen ground. Geomorphic unit is the most important factor resulting in the difference of the seasonally frozen ground. The buried depth of ground water is the difinitive factor leading to differentiation of the seasonally frozen ground in fine-grained soil plane and human activity has a great influence on frozen condition.
According to geomorphic unit and buried depth of ground water, seasonally frozen ground in this region can be corresponding divided into 4 seasonally frozen ground areas and 4 frost heaving types, they are unfrost heaving, weak frost heaving, frost heaving and strong frost heaving.
出处
《冰川冻土》
CSCD
北大核心
1989年第4期372-382,共11页
Journal of Glaciology and Geocryology
关键词
季节冻土
冻胀
冻结深度
地域分异
seasonally frozen ground, freezing depth, frost heaving, geographica differentiation
