淮北城镇地下水开采地面沉降InSAR监测研究

Research on InSAR monitoring of land subsidence caused by groundwater extraction in Huaibei Towns

长期超量开采地下水是打破地下水循环平衡,导致地下水位快速下降,引发地面沉降灾害的重要因素。本文以淮北平原地区的临泉县为研究对象,采用SBAS-InSAR技术监测该地区2018年1月20日至2019年12月29日期间的地面沉降,获取了该地区空间连续的地面沉降场,分析了地下水开采对地面沉降时空特征分布的影响,研究了地面沉降与地下水之间的相关性。结果表明,监测期间临泉县城区各区域均发生了不同程度的地面沉降,最大沉降速率达56mm/yr,最大累计沉降量超过110mm。对该区域的研究分析发现,在沉降严重的区域周围有大量采水井分布,而无采水井分布的区域沉降情况则相对轻微,表明该地区地面沉降受地下水开采的影响较为显著。研究区域内的形变分布特征与影响因素分析可为地下水的合理开采与利用提供参考信息。

Long-term overexploitation of groundwater is an important factor that breaks the balance of groundwater circulation, leads to a rapid drop in groundwater level, and causes land subsidence disasters. Taking Linquan County in the Huaibei Plain as the research object, this paper uses SBAS-InSAR technology to monitor the land subsidence in this area from January 20, 2018 to December 29, 2019, and obtains the spatially continuous land subsidence field in this area, analyzes the influence of groundwater exploitation on the distribution of spatial and temporal characteristics of land subsidence, and studies the correlation between land subsidence and groundwater. The results show that different degrees of land subsidence occurred in all areas of Linquan County during the monitoring period, the maximum subsidence rate reached 56 mm/yr, and the maximum accumulated subsidence exceeded 110 mm. The research on this area shows that there are a large number of water extraction wells distributed around the area with severe subsidence, while the subsidence of the area without water extraction well is relatively slight, indicating that the ground subsidence in this area is significantly affected by groundwater extraction. The analysis of deformation distribution characteristics and influencing factors in the study area will provide references for rational exploitation and utilization of groundwater.