Effect of increasing rainfall on the thermal–moisture dynamics of permafrost active layer in the central Qinghai–Tibet Plateau

作     者：ZHOU Zhi-xiong ZHOU Feng-xi ZHANG Ming-li LEI Bing-bing MA Zhao ZHOU Zhi-xiong;ZHOU Feng-xi;ZHANG Ming-li;LEI Bing-bing;MA Zhao

作者机构：College of Civil EngineeringLanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Frozen Soil EngineeringNorthwest Institute of Eco-Environmental and ResourcesChinese Academy of SciencesLanzhou 730000China Geological Hazards Prevention InstituteGansu Academy of SciencesLanzhou 730000China 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2021年第18卷第11期

页      面：2929-2945页

核心收录：

学科分类：07[理学] 0705[理学-地理学] 070501[理学-自然地理学] 

基　　金：This study was supported by the Natural Science Foundation of China(No.41801033,No.41961010) Young doctor Foundation of Education Department of Gansu Province(2021QB-039) open fund of the State Key Laboratory of Frozen Soil Engineering(SKLFSE201804) Hongliu Support Funds for Excellent Youth Talents of Lanzhou University of Technology(Dr.ZHANG Mingli) Industrial support program of higher education of Gansu province(2020C-40) Basic Research Innovation Group of Gansu province(20JR5RA478) 

主　　题：Active layer Rainfall Qinghai–Tibet Plateau(QTP) Thermal–moisture dynamics Numerical modeling 

摘      要：In the past several decades,the trend of rainfall have been significantly increasing in the Qinghai–Tibet Plateau,which inevitably leads to a change in the surface energy balance processes and thermal-moisture status of the permafrost active ***,the influence of mechanisms and associated effects of increasing rainfall on active layers are still poorly ***,in this study,a validated coupled numerical water–vapor–heat model was applied for simulating the surface energy components,liquid and vapor water migration,and energy transfer within the permafrost active layer under the action of increasing rainfallin the case of an especially wet *** obtained results demonstrate that the surface heat flux decreaseswith the increase in rainfall,and the dominant form of energy exchange between the ground and atmospherebecomes the latent heatflux,which is beneficial for the preservation of *** increasing rainfall will also cause the migration of liquid and vapor water,and the migration of liquid will be more *** liquid and vapor water migrationcaused by the increasing rainfallis also accompanied by energy *** the increase in rainfall,the decrease in total soil heat flux directly leads to a cooling effect on the soil,and then the upper limit of the frozen soil rises,which alleviates the degradation of *** results provide further insights into engineering structures,regional ecological climate change,hydrology,and environmental issues in permafrost regions.