摘要
本文提出了一种确定相变界面位置的新方法,其要点如下:首先根据冻结和融化过程中温度场在不同区域的特征,将温度波分成线性分量和非线性分量;然后详细研究表面温度波非线性变换的第一个谐波,并分析日波分量在z_(?)的变化。证明随深度变化有极大值存在,其与相界面的位置相一致。与实验资料相比较,证明文中给出的确定相变界面深度的方法是正确的。本文给出的方法只适合于有自动数据采集的系统。
In this paper, a new method of determining phase change front is presented. Basis procudure of the method is mainly as follows, first, temperature wave is divided into linear component and non-linear component according to characteristic of freezing and thawing process of soil; then, first barmonic wave of non-linear translation of the surface temperature wave is researched in detail, and characteristic of the component of daily harmonic wave at zrp is analsed. It is proved that KΦK exists the maximum as changing with depth, and the maximum consists with phase change front. It is goal of this paper. Compared with experimental data, it is proved that the method presented in this paper is correct. It is noteworthy that this method is only suitable for the system with data collection automatically.
出处
《冰川冻土》
CSCD
北大核心
1992年第3期193-201,共9页
Journal of Glaciology and Geocryology
关键词
土
水分
凝聚
冻-融界面
深度
freezing-thawing interface, temperature wave, periodic temperature function zone of phase change frozen region, thawing region
