Spatio-temporal variations in air/ground freezing–thawing indices along the China–Nepal Highway during 1987–2017  

作　　者：ZHANG Tianqi LUO Tao ZHANG Chonglei YU Wenbing PEI Wansheng 

机构地区：[1]Shaanxi Key Laboratory of Safety and Durability of Concrete Structures,Xijing University,Xi’an 710123,China [2]State Key Laboratory of Mountain Hazards and Engineering Resilience,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China [3]Institute of Future Civil Engineering Science and Technology,Chongqing Jiaotong University,Chongqing 400074,China [4]Key Laboratory of Cryospheric Science and Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China

出　　处：《Journal of Mountain Science》2025年第2期521-536,共16页山地科学学报(英文)

基　　金：supported by the Second Tibetan Plateau Scientific Expedition and Research Program(STEP)(Grant No.2021QZKK0202);Shaanxi Provincial Youth Science and Technology Rising Star Project(No.2022KJXX-85);Key Scientific Research Project of Shaanxi Provincial Department of Education(No.22JS041);Youth Innovation Team Research Project of Shaanxi Provincial Department of Education(Nos.22JP099,21JP137);The Youth Innovation Team of Shaanxi Universities;the Support Program for Outstanding Young Talents of Shaanxi Universities(Dr.Tao Luo)。

摘　　要：Freezing–thawing indices serve as a comprehensive indicator of both the duration of the freezing/thawing periods and the degree of cold and heat in a given region.In-depth analysis of the freezing-thawing indices not only enables the prediction of permafrost distribution and its dynamic changes,but also facilitates the assessment of damage risk to infrastructure under freeze-thaw action.In this paper,the air/ground freezing–thawing indices from 1987 to 2017,based on daily temperature observations from meteorological stations along the China–Nepal Highway(CNH),were calculated,and their spatial and temporal variation patterns were analyzed.The results showed that:(1)Both mean annual air temperature and mean annual ground surface temperature along the CNH fluctuated upward,with climate tendency rates of 0.43 and 0.52.C·(10a)~(-1),respectively;(2)The number of days with negative air temperature and ground temperature showed fluctuated downward,with change rates of-8.6 and-8.3 d·(10a)~(-1),respectively;(3)The ranges of air freezing index,air thawing index,ground freezing index,and ground thawing index over the years were 157.05-458.88°C·d,2034.20-2560.73°C·d,108.78-396.83°C·d,and 3515.25-4288.67°C·d,respectively.The climate tendency rates were-5.42,10.22,-6.79,and 12.14.C·d·a-1,respectively,showing a general warming trend;(4)The air freezing index,ground freezing index,and ground thawing index changed abruptly in 1999,2000,and 2002,respectively,evincing significant changes after 2002.The research results can provide a basis for the risk assessment of freezing–thawing erosion and the prevention and control of permafrost engineering diseases along the CNH.

关 键 词：China–Nepal Transportation Corridor China–Nepal Highway Freezing–thawing indices Spatio–temporal change 

分 类 号：U412.22[交通运输工程—道路与铁道工程] P642.14[天文地球—工程地质学]