阴山北部耕作土壤冻结过程温度变化的数值模拟  

Numerical simulation on soil freezing process of agro-pastoral mixed region at northern Yinshan Mountains of Inner Mongolia

作　　者：刘铁军[1] 何京丽[1] 张瑞强[1] 李晓丽[2] 申向东[2] 

机构地区：[1]水利部牧区水利科学研究所,内蒙古呼和浩特010020 [2]内蒙古农业大学水利与土木建筑工程学院,内蒙古呼和浩特010018

出　　处：《干旱区地理》2008年第6期850-854,共5页Arid Land Geography

基　　金：国家自然科学基金资助项目(10262001);重大基础研究前期研究专项项目(2002ccc03400)

摘　　要：在建立土壤冻结模型的基础上,对内蒙古阴山北部农牧交错带耕作土壤冻结过程进行了数值模拟,计算方法采用三点中心差分格式,模拟出冻结缘变化情况下的土壤冻结过程中温度曲线。模拟结果与野外试验进行对比,结果可信。通过阴山北部耕作土壤的冻结模拟研究,揭示了该地区耕作土壤的冻结特性,对进一步研究该地区的土壤冻融变异下的风蚀提供帮助。This paper has made field experiment of the soil freezing process of agro-pastoral ecotone at northern Yinshan Mountains of Inner Mongolia and numerically simulated this process. Soil samples were collected from the region of northern Yinshan Mountains of Inner Mongolia, which are silt loam and never been studied by any researchers both in China and abroad. In field experiment, the soil of 0 -25 cm depth freezing temperature was tested and a temperature curve of soil-freezing process under the condition of variable frozen fringe was simulated with the numerical simulation method of the third differential. The simulating result was compared with that of the field experiment, which proved that they are identified with each other. From the simulating result, it is found that soil temperature changed violently on frozen fringe, which means that the inner characteristics of soil frozen fringe is very complicated during the freezing process. The computer program FEMLAB has been applied in the simulating process, whose interface is much more visual, whose language compiling process is simpler, and whose simulating result is more precise and intuitionist. By means of numerical simulation on temperature variation characteristics of field freezing process of northern Yinshan Mountains, the freezing law of this area is probed, which provides basic theoretical gist with regard to wind erosion research on soil freezing-thawing variation, agricultural frozen field research.

关 键 词：冻融侵蚀 土壤冻结 冻结缘 数值模拟 

分 类 号：S152[农业科学—土壤学]