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利用COUPMODEL模型,对唐古拉研究区活动层土壤的水热特征进行模拟,与观测结果进行对比发现,在活动层土壤温度方面,COUPMODEL模型的模拟结果R2>0.94,其平均值为0.98,均方根误差较小,模拟效果较理想;在活动层水分特征方面,模拟结果存在一定偏差,R2介于0.88~0.93之间,平均值0.90,均方根误差平均值4.24,基本反映了高海拔多年冻土区活动层水热变化;在土壤热通量方面,0~20 cm土壤热通量的模拟结果与观测值基本一致;模型模拟的冻结深度在3 m左右,接近观测值,COUPMODEL模型可用于多年冻土区活动层土壤水热变化规律研究。
The COUPMODEL model was used to simulate the hydrothermal characteristics of the soils in the active layer in the Tanggula study area. Comparing with the observed results, it was found that the COUPMODEL model was R2> 0.94 with an average of 0.98 in terms of soil temperature in the active layer. The root mean square The error is smaller and the simulation result is more ideal. There is a certain deviation in the water characteristics of the active layer, R2 is between 0.88 ~ 0.93, the average is 0.90, the average root mean square error is 4.24, basically reflecting the high-altitude perennial freeze In the soil heat flux, the simulation results of soil heat fluxes at 0 ~ 20 cm are basically consistent with the observed values. The freezing depth of the model simulation is about 3 m, which is close to the observed value. COUPMODEL model can be used for Study on Soil Water and Heat Variation Laws of Active Soil in Permafrost Regions.