基于SBAS-InSAR的西安市鱼化寨地区地面沉降与地裂缝时空演变特征研究

    SPATIAL-TEMPORAL EVOLUTION CHARACTERISTICS OF LAND SUB-SIDENCE AND GROUND FISSURE IN YUHUA VILLAGE OF XI'AN CITY USING SBAS-INSAR TECHNIQUE

    • 摘要: 自20世纪50年代末以来,西安市遭受了严重的地面沉降和地裂缝灾害,严重制约了西安市城市建设发展规划。本文以西安市典型地面沉降区之一的鱼化寨为研究区,基于短基线集合成孔径雷达干涉测量技术,采用覆盖研究区的ERS(1992~1993年)、Envisat(2003~2010年)、Sentinel-1A(2015~2020年)3种卫星数据,并结合区内钻孔、地下水开采及城市发展建设历史和现状资料,分析鱼化寨周边地区地面沉降与地裂缝时空演变特征,探讨区内地面沉降与地裂缝的成因机制。本文获取的主要结果如下:获取了鱼化寨周边地区1992~2020年3阶段年均沉降速率图,揭示区内沉降中心由90年代电子城处(90mm ·a-1)变为现今鱼化寨处(50mm ·a-1);证实了地面沉降与地裂缝在时空分布上具有关联性,地裂缝发育于地面沉降槽的北侧边缘,限制了地面沉降槽向北扩展,且随地面沉降槽的发展而延伸;揭示了鱼化寨沉降中心仍在扩大,f4地裂缝还存在向西延伸的可能;明确了鱼化寨周边地区地面沉降和地裂缝的发展受地下承压含水层的开采及人类建设活动等的影响。上述认识可为受地面沉降和地裂缝影响的城市地面开发利用和灾害防治提供一定参考和支撑。

       

      Abstract: Since the late 1950s,Xi'an City has suffered from serious land subsidence and ground fissure,which seriously restricted the urban construction and development planning of Xi'an City. In this study,Yuhua Village,one of the typical land subsidence areas in Xi'an City,was taken as the research area. Based on the SBAS-InSAR technique,ERS(1992-1993),Envisat(2003-2010) and Sentinel-1A(2015-2020)satellite datas covering the study area are used to analyze the temporal and spatial evolution characteristics of land subsidence and ground fissures in the surrounding area of Yuhua Village. The drilling data and the history and current situation of groundwater exploitation and urban development are used in this paper. The genetic mechanism of land subsidence and ground fissures in the study area is also discussed. The main conclusions of this study are as follows. (1)The annual average subsidence rate of three stages in the surrounding area of Yuhua Village from 1992 to 2020 is obtained,which reveals that the subsidence center changes from the Electronic City(90mm ·a-1)in the 1990s to the present Yuhua Village(50mm ·a-1). (2)It is confirmed that there is a correlation between the land subsidence and the ground fissure in the temporal and spatial distribution. The ground fissures develop in the north edge of the land subsidence trough,which limit the northward development of land subsidence trough. And the ground fissures extend with the development of the land subsidence trough. (3)It is revealed that the Yuhua Village subsidence center is still expanding,and the f4 ground fissure may extend westward. (4)The development of land subsidence and ground fissure around Yuhua Village is affected by the exploitation of underground confined aquifer and human construction activities. The above understanding can provide certain reference and support for urban land development and disaster prevention affected by land subsidence and ground fissures.

       

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