基于Landsat数据的新藏铁路沿线(西藏段)积雪覆盖变化分析  

Analysis of snow cover changes along the Xinjiang-Xizang Railway(Xizang section)based on Landsat data

作　　者：刘正鑫 赵鑫永 高凤欣 黎覃 旦增宗追 郭朵朵 柴浩森 Liu Zhengxin;Zhao Xinyong;Gao Fengxin;Li Qin;Danzeng Zongzhu;Guo Duoduo;Chai Haosen(Xizang university institute of technology,Lhasa 850000,China)

机构地区：[1]西藏大学工学院,拉萨850000

出　　处：《西藏科技》2024年第9期50-58,共9页Xizang Science And Technology

基　　金：西藏大学高水平人才培养计划项目(2022-GSP-S006)。

摘　　要：文章利用Landsat陆地卫星数据和DEM数据,通过GIS分析了新藏铁路沿线(西藏段)噶尔—普兰—仲巴-吉隆一线2020至2023年雪季积雪覆盖情况和气候变化情况,可对铁路选线提供一定程度参考,后续也可在此基础上对线路段冰雪灾害进行全面分析。研究结果表明:(1)整个雪季稳定积雪主要分布在海拔4200~5500m的山岭上,阿里地区噶尔县昆莎乡和普兰县马悠木山区域的积雪较多,覆盖到研究区的积雪主要是季节性积雪,受气候因素影响较大。(2)西藏西南部积雪的时空分布极不均匀,雪季历年同月分布差异极大,差异均在20%以上,极端月可达50%以上。(3)研究区内冬季平均气温在-35.5~6.9℃之间,平均风速在不同月份均处于0~5.77 m/s的范围内,达到雪颗粒启动风速,利于风吹雪的形成和发展,在铁路选线时应注意冰雪灾害对工程建设的影响。This study utilizes Landsat satellite data and DEM data to analyze the snow cover and climate change along the Garl-Pulan-Zhongba-Gyirong line(Xizang section)of the Xinjiang-Xizang Railway from 2020 to 2023 through GIS.The results can provide a certain degree of reference for railway route selection,and can also be used to conduct a comprehensive analysis of the ice and snow disasters along the line section based on this study.The findings indicate that(1)the stable snow cover throughout the snow season is mainly distributed on mountain ridges at an altitude of 4200~5500 m,and there is more snow in the Kunsa Township of Garl County and the Ma Youmu Mountain area of Pulan County in the Ali region and the snow cover in the study area is mainly seasonal,greatly affected by climatic factors;(2)the spatiotemporal distribution of snow in southwestern Tibet is extremely uneven,and the distribution of snow season varies greatly in the same month of the year,with a difference of more than 20%and an extreme month of more than 50%;(3)he average winter temperature in the study area ranges from-35.5 to 6.9°C,and the average wind speed ranges from 0 to 5.77 m/s in different months,which reaches the starting wind speed of snow particles and is conducive to the formation and development of windblown snow,and the impact of ice and snow disasters on engineering construction should be paid atttention during route selection.

关 键 词：积雪遥感 积雪覆盖分析 冰雪灾害 LANDSAT 西藏 

分 类 号：U216.412[交通运输工程—道路与铁道工程] P407[天文地球—大气科学及气象学]