大兴安岭地区的冻土热状态模拟

Simulation on Thermal State of Frozen Ground in Daxing’an Mountains

在大兴安岭地区内沿北向南设置4个试验点(二十四站、塔尔根、临海、古源),应用库得里亚采夫(Kudryavtsev)模型(平衡模型)、一维瞬态传热的数值模型(物理模型)对研究区多年冻土活动层厚度与热状态进行模拟;对比实测地温与模型模拟地温,检验模型模拟精度;依据模拟精度、计算成本,比较2种模型的实际应用价值。结果表明:一维瞬态传热数值模型计算精度为0.14~0.18 m,但其计算成本较高;库得里亚采夫模型计算精度为0.19~3.00 m,但计算成本较低,基本能满足工程计算需求,具有较好的实际应用价值。

Four test sites(Ershisizhan,Targen,Linhai,and Guyuan)were set up along the north to south in the Daxing’an Mountains,and the Kudryavtsev model(equilibrium model)and the numerical model of one-dimensional transient heat transfer(physical model)were applied to the thickness and thermal state of the active layer of permafrost in the study area for many years.The accuracy of the model simulation was examined by comparing the measured ground temperature with the model simulation,and the practical application values of two models were compared with the simulation accuracy and computational cost.The calculation accuracy of the one-dimensional transient heat transfer numerical model is 0.14-0.18 m,but its calculation cost is higher.The calculation accuracy of the Kudryavtsev model is 0.19-3.00 m,but the calculation cost is lower,which can basically meet the engineering calculation requirements with good practical application value.