An attribution analysis of land subsidence features in the city of Bayannur in Inner Mongolia based on InSAR
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摘要:
巴彦淖尔市位于内蒙古自治区西部，区内第四系松散沉积层厚度大，具有发育地面沉降的基础条件。为填补该地区地面沉降研究的空白，利用PS-InSAR和SBAS-InSAR技术分别对巴彦淖尔市2007—2011年（ALOS PALSAR数据，98景）和2015—2016年（Radarsat-2数据，10景）的地面沉降情况进行定量分析，并现场实地调查验证了InSAR技术监测结果的可靠性，以分析探讨该区域地面沉降成因及发展趋势。研究结果表明：（1）巴彦淖尔市地面沉降属于缓慢性沉降，沉降严重程度为低级，处于发生阶段；（2）2007—2011年沉降速率主要集中在0~10 mm/a，存在3处地面沉降集中区，即杭锦后旗沉降区（A）、临河区沉降区（B）、开发区水源地及北部沉降区（C）；（3）2015—2016年沉降速率主要集中在0~2.6 mm/a，存在1处地面沉降区，即临河区及北部沉降区（D），该沉降区是在B区的基础上继续向周边及北部扩展形成的；（4）巴彦淖尔市地面沉降的主要影响因素为地下水开发利用引起的地下水位下降，沉积层固结压实是重要因素，地表荷载的增加也产生了一定推动作用。
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关键词:
- PS-InSAR /
- SBAS-InSAR /
- 巴彦淖尔市 /
- 地面沉降 /
- 地下水位下降
Abstract:The thickness of Quaternary loose sediments in the city of Bayannur in the west of Inner Mongolia Autonomous Region is large, which provides basic conditions for the development of land subsidence. ALOS PALSAR (98 frames from 2007 to 2011) and RADARSAT-2 (10 frames from 2015 to 2016) are extracted to quantitatively analyze the land subsidence in the city of Bayannur, respectively, by using the PS-InSAR and SBAS-InSAR method for the first time, and field investigation is carried out to verify the reliability of InSAR monitoring results. The causes and development trend of land subsidence in this area are further analyzed, and important technical support for land subsidence disaster prevention and reduction are provided. The results indicate that (1) the land subsidence in the city of Bayannur exhibites a slow trend. The severity of subsidence is low and belongs to the stage of occurrence. (2) The subsidence rate was mainly concentrated in 0−10 mm/a from 2007 to 2011, and three concentrated land subsidence areas were observed: the Hanggin Rear Banner subsidence area (A), Linhe district subsidence area (B), and the water source area of development zone subsidence area (C). (3) From 2015 to 2016, the subsidence rate was mainly concentrated in 0−2.6 mm/a, and one concentrated land subsidence area was detected, that is, the Linhe district and north subsidence area (D), where the land subsidence is based on the Linhe district subsidence area (B), and continues to expand to the surrounding areas and the north. (4) The main influencing factor of land subsidence in the city of Bayannur is the groundwater level drop caused by the development and utilization of groundwater. Besides, the consolidation and compaction of the sediments is also an essential factor for the land subsidence in this area, and the increase in surface load has a certain promoting effect on the land subsidence.
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Key words:
- PS-InSAR /
- SBAS-InSAR /
- Bayannur /
- land subsidence /
- groundwater level drop
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表 1 巴彦淖尔市ALOS PALSAR 和Radarsat-2 数据参数
Table 1. Parameters of ALOS PALSAR data and Radarsat-2 SAR data in the city of Bayannur
传感器 ALOS PALSAR Radarsat-2 卫星高度/km 691.65 798 波段（波长/cm） L（23.6） C（5.6） 空间分辨率/m 4.684（FBS）/9.368（FBD） 5 图幅范围/km 30×70 125×125 影像数/景 98 10 时间跨度 2007-01-13—2011-03-11 2015-06-02—2016-12-31 
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表 2 巴彦淖尔市地面沉降集中区特征
Table 2. Characteristics of land subsidence concentration area in the city of Bayannur
编号 地面沉降区 最大沉降
速率/（mm·a−1）沉降区面积
/km2时间段 A 杭锦后旗 7.285 33.04 2007—2011 B 临河区 8.336 139.98 2007—2011 C 开发区水源地及北部 4.615 51.51 2007—2011 D 临河区及北部 5.634 221.43 2015—2016
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