Study of land subsidence and groundwater activity using SBAS time-series analysis
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摘要: 大同盆地是汾渭盆地北端一个地面沉降较严重的区域,地下水开采是该区域地面沉降发生的一个重要原因。然而地下水活动与地面沉降在空间和时间的相关性却鲜有研究。为了掌握该地区地下水活动与地面沉降的内在联系,该文基于Envisat ASAR数据,利用短基线集( small baseline subset,SBAS)-InSAR技术对大同盆地地面沉降形变特征进行监测;同时利用地下水位监测数据,研究地面沉降中心与地下水位漏斗在空间和时间上的对应关系,定量分析2处地下水位波动与地表形变的关系。研究表明,地下水开采是大同盆地水源地地面沉降的主要原因,但并非所有的地下水位漏斗都存在地面沉降。该研究成果对指导该地区地下水开采及控制地面沉降有一定参考价值。
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关键词:
- 短基线集(SBAS) /
- 地面沉降 /
- InSAR /
- 大同 /
- 地下水开采
Abstract: The Datong Basin located at the northern end of the Fenwei Basin is a serious land subsidence area. The groundwater exploitation is an important factor responsible for the land subsidence. However, the study of the correlation between the groundwater activities and the land subsidence in this area is very insufficient. In order to investigated the relationship between the groundwater and the land subsidence, the authors monitored the characteristics of Datong land subsidence deformation by using small baseline subset( SBAS) InSAR technique with Envisat ASAR images. At the same time, the corresponding spatial - temporal relations between the ground subsidence center and the groundwater funnel were studied. Two models illustrating relationships between the ground subsidence and the groundwater funnel were built. The research shows that underground water exploitation is a major factor responsible for land subsidence in Datong; nevertheless, not all the underground water exploitation can cause land subsidence. This study has a good reference value for guiding the production and control of the underground water exploitation and land subsidence.-
Key words:
- small baseline subset( SBAS) /
- ground subsidence /
- InSAR /
- Datong /
- groundwater exploitation
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