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寒区土壤温度场观测多采用垂直埋管方式,常用管材有铁管、PVC管、PPR管、PE管等,在实践中发现同一地点不同材质测管所测温度场存在较大差异.为研究几种常用测温管材测试值的差异性,2014年11月3日至2015年4月29日对四种材质垂直埋管与土壤直埋传感器的测温方式进行了现场比对试验.结果表明:(1)不同材质垂直埋管因其物理性质的差异,在测温过程中对温度场有不同程度的影响,PVC管和PPR管的测温值分别偏高于相应土层温度约0.8℃和0.3℃,而铁管和PE管则分别偏低于相应土层温度约0.4℃和0.6℃.(2)管材中温度场数据与土壤温度场数据相关性由高到低排序为:铁管>PPR管>PVC管>PE管.(3)通过最小二乘法,求得铁管-土壤各层埋深温度场的转换系数,并得到铁管-土壤温度场拟合方程,经证实相关性显著.
In cold area, the soil temperature field observation mostly adopts the vertical buried pipe method, commonly used pipe material is iron pipe, PVC pipe, PPR pipe, PE pipe, etc. In practice, there is a big difference in the temperature field measured by different material pipes in the same place. Several commonly used temperature pipe testing value differences, November 3, 2014 to April 29, 2015 on the four kinds of material vertical buried pipe and soil Buried sensor temperature measurement methods were compared on-site test results show that : (1) Due to the different physical properties of vertical pipes of different materials, the temperature field has different degrees of influence in the temperature measurement. The temperature of PVC pipe and PPR pipe are higher than the corresponding soil temperature by about 0.8 ℃ And 0.3 ℃, respectively, while that of the iron pipe and PE pipe were respectively lower than the corresponding soil temperature by about 0.4 ℃ and 0.6 ℃. (2) The correlation between temperature field data and soil temperature field data in descending order was: iron pipe > PPR tube> PVC tube> PE tube. (3) The least square method was used to get the conversion coefficient of the temperature field of the tube-soil layers and the fitting equation of iron tube-soil temperature field was obtained. Significant.