摘要
在全球变暖和人类活动的双重作用下,位于青藏高原腹地的青藏工程走廊多年冻土区段多年冻土退化强烈,从而引发了一系列病害问题,这为位于其内的青藏公路、青藏铁路等线性工程基础设施的维护和安全带来了较大的困扰。地表形变作为路基病害及环境地质灾害的第一表征,可以对工程病害进行有效的指示,但到目前为止,尚未有覆盖整个工程走廊多年冻土区的相关地表形变数据集,特别是垂直向的形变数据。本研究首先基于Li CSBAS工具包对Li CSAR产品进行时序InSAR处理,以获得工程走廊多年冻土区地表升、降轨一维LOS向形变;然后以SAR影像获取日期为条件,筛选出影像获取日期相同或相近的升、降轨时序InSAR形变监测数据,在忽略南北向形变的情况下解算出地表东西向和垂直向形变,从而获得2017–2022年观测期内的地表一维(升、降轨LOS向)和二维(东西向和垂直向)形变速率和时序累积形变结果(共计51期),即青藏工程走廊多年冻土区地表形变数据集。基于现场监测的形变结果与垂直向形变结果的对比表明,精度大多在10 mm内,最大不超过30 mm。本数据集不仅可以作为后续相关InSAR形变监测的对比数据,而且还可以为交通线性工程,如青藏公路、青藏铁路等的正常运营和维护提供数据支撑和有效建议。此外,本数据集还可以作为输入数据用于多年冻土活动层厚度的反演等工作。
Under the dual effect of global warming and human activities,permafrost degradation in the Qinghai-Tibet Engineering Corridor(QTEC),located in the hinterland of Qinghai-Tibet Plateau(QTP),has been intense,triggering a series of geohazards and posing significant challenges to the maintenance and safety of linear engineering infrastructures such as the Qinghai-Xizang Highway(QTH)and Qinghai-Xizang Railway(QTR).Ground deformation,as the primary indicator of common embankment and pavement distresses as well as related environmental geological hazards,can be as an effective proxy for engineering problems.While until now,there is no relevant ground deformation dataset covering the whole QTEC permafrost section,especially in the vertical(up and down,UD)deformation.In this study,LiCSAR(Looking Into Continents from Space with Synthetic Aperture Radar)products were firstly processed using time-series InSAR(Synthetic Aperture Radar Interferometry)via the LiCSBAS toolkit(an open-source InSAR time-series analysis package developed by the Looking inside the Continents from Space project)to obtain one-dimensional line-of-sight(LOS)deformation results of the surface ascending and descending orbits in the permafrost zone of the QTEC.Then,using SAR image acquisition dates as a constraint,we filtered out the ascending and descending orbit time-series InSAR deformation datasets with the same or similar acquisition dates for two-dimensional surface deformation,namely surface east-west(EW)and vertical(UD)directions,while ignoring north-south deformation.As a result,both one-dimensional(ascending and descending LOS)and two-dimensional(EW and UD)deformation velocities and cumulative time-series deformation for 51 periods from 2017 to 2022 were obtained.Comparison with field-based monitoring indicates that the vertical deformation results show an accuracy mostly within 10 mm,with a maximum error not exceeding 30 mm.This dataset can not only be used as a benchmark for subsequent InSAR deformation monitoring,but also provide data support and effective suggestions for the normal operation and maintenance of transportation linear projects,such as QTH and QTR.In addition,it can be used as input for the inversion of permafrost active layer thickness and other related geotechnical analyses.
作者
杜青松
李国玉
车涛
穆彦虎
马巍
DU Qingsong;LI Guoyu;CHE Tao;MU Yanhu;Ma Wei(State Key Laboratory of Cryospheric Science and Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,P.R.China;International Research Center for China-Mongolia-Russia Cold and Arid Regions Environment and Engineering,Chinese Academy of Sciences,Lanzhou 730000,P.R.China;Da Xing’an ling Observation and Research Station of Frozen-Ground Engineering and Environment,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Jiagedaqi 165000,P.R.China;University of Chinese Academy of Sciences,Beijing 100049,P.R.China)
基金
第二次青藏高原综合科学考察研究项目(2019QZKK0905)
青海省青藏高原公路建设与养护重点实验室开放课题(2024-JY-D-03)
冻土工程国家重点实验室自主研究项目(SKLFSE-ZQ-202303)
甘肃省科技重大专项(23ZDFA017)
西藏自治区科技计划项目(XZ202401ZY0040)
甘肃省青年科技基金项目(25JRRA515)。
关键词
青藏工程走廊
多年冻土
地表形变
INSAR
寒区工程
Qinghai-Xizang Engineering Corridor
permafrost
ground deformation
InSAR
cold regions engineering
