为探究青藏公路沿线多年冻土活动层地温变化规律与影响因素,本文选取青藏公路沿线2个代表性地区(西大滩、五道梁)2013-2022年多年冻土活动层地温及气象数据,对多年冻土活动层地温的时空变化规律和4个主要影响因素(气温、比湿度、降水量、表层40 cm 土壤含水量)展开研究.结果显示:青藏公路沿线多年冻土活动层地温在空间特征上表现为活动层地温波动幅度随着土壤深度的加深逐渐趋于平稳;在时间特征上表现为随着土壤深度的加深,气温对活动层地温产生的滞后天数逐渐增加.4个主要影响因素对多年冻土活动层地温影响的顺序为气温＞比湿度＞降水量＞表层40 cm 土壤含水量,其中气温与比湿度对浅层活动层地温的贡献率最大,表层40 cm 土壤含水量贡献率最小.该结果可为青藏公路的病害分析和防治对策研究提供科学依据.
Study on the variation rules and influencing factors of ground temperature of permafrost active layer along the Qinghai-Tibet Highway
The ground temperature and meteorological data of permafrost active layer in the two representative regions(Xidatan and Wudaoliang)along the Qinghai-Tibet Highway from 2013 to 2022 are taken as research object to explore the variation rules and influencing factors of ground tem-perature of permafrost active layer along the route.The spatiotemporal variation patterns of ground temperature and four main influencing factors(temperature,specific humidity,precipitation and sur-face 40 cm soil moisture content)are investigated for the research.The results show that the fluctua-tion amplitude of ground temperature of permafrost active layer along the route gradually stabilizes with the deepening of soil depth.Besides,the lag days of temperature on the active layer ground temperature gradually increase as the soil depth deepens.The order in which the four main influen-cing factors affect the ground temperature of permafrost active layer is temperature＞specific humidi-ty＞precipitation＞surface 40 cm soil moisture content.Among them,temperature and specific hu-midity have the greatest contribution to the ground temperature of shallow active layer,while the con-tribution of surface 40 cm soil moisture content is the smallest.The result can provide scientific basis for disease analysis and prevention strategies research on the Qinghai-Tibet Highway.
NETL
NSTL
万方数据
