青藏高原不同半径热融湖下融区发展差异的非线性分析

以青藏高原北麓河地区的气象资料、热融湖信息和冻土监测数据为基础,以柱坐标系下伴有相变的热传导方程为模型,在假设不同半径热融湖湖底温度和湖水深度相同条件下,模拟了不同半径热融湖对湖下多年冻土热状况和融区发展长期影响的差异.计算结果表明,不同半径热融湖湖下土壤热状况和融区发展都有较大差异,精确模拟热融湖下土壤热状况和融区发展的数学模型必须考虑热融滑塌引起的热融湖横向扩展作用.

Nonlinear Analysis of Talik Development Differences under Thaw Lakes with Different Radiuses on Qinghai-Tibet Plateau

On the basis of the meteorological data,thaw lake information,and the observed permafrost data from a monitoring project in the Beiluhe Basin on the Qinghai-Tibet Plateau,this study analyzes the differences of the long-term influence of thaw lake on ground thermal regime and talik development under thaw lakes with different lake radiuses,by using a heat transfer model with phase change under a cylindrical coordinate system.The lake bottom temperature and the lake water depth are assumed to be identical for lakes with different radiuses.The simulated results indicate that the considerable differences exist in both ground thermal regime and talik development under thaw lakes with different radiuses.An accurate mathematical model for ground thermal regime and talik development under a thaw lake should include the impact of horizontal expansion of the thaw lake caused by thaw slumping.