摘要
针对永定河流域(北京段)地表沉降及其与地下水位变化、生态补水之间的关系问题,利用小基线集合成孔径雷达干涉测量技术对覆盖研究区域的32景升轨雷达影像进行处理,提取了地表形变时空分布特征,分析了地表形变与地下水位变化的关系,并探讨了生态补水对区域地表沉降的影响。结果表明,流域上部具有一定的沉降区域,主要沉降速率为5~20 mm/a。地表形变与地下水位变化之间存在显著相关性:流域上部地下水位整体呈下降趋势,区域地表沉降相对严重;流域中下部地下水位整体呈上涨趋势,区域地表沉降得到遏制。生态补水对区域地表沉降有显著影响,但具体类型与区域地形地质、河道特征相关。
In view of the surface subsidence and its relationship with the groundwater level change and ecological water replenishment in Yongding River Basin(Beijing section),this study uses small baseline subset interferometric synthetic aperture radar(SBAS-InSAR)technology to process 32 ascending radar images covering the study area,extracts the temporal and spatial distribution characteristics of surface deformation,analyzes the relationship between surface deformation and groundwater level change,and investigates the influence of ecological water replenishment on regional surface subsidence.The results show that there is a certain subsidence area in the upper part of the basin,and the main subsidence rate is 5~20 mm/a.There is a significant correlation between surface deformation and groundwater level change:the groundwater level in the upper part of the basin shows a decreasing trend as a whole,and the regional surface subsidence is relatively serious;The groundwater level in the middle and lower parts of the basin shows an increasing trend as a whole,and the regional surface subsidence has been curbed.Ecological water replenishment has a significant influence on regional surface subsidence,but the specific type is related to the regional topography,geology and river course characteristics.
作者
田枭
林敦灵
刘洋
韩森
董梦
李航昊
TIAN Xiao;LIN Dunling;LIU Yang;HAN Sen;DONG Meng;LI Hanghao(School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China;BGI Engineering Consultants Ltd.,Beijing 100038,China)
出处
《测绘科学》
CSCD
北大核心
2022年第9期95-101,137,共8页
Science of Surveying and Mapping
基金
国家自然科学基金项目(41874011)
国家重点研发计划项目(2018YFC1503603)
关键词
永定河
SBAS-InSAR
地表形变
地下水位
生态补水
Yongding River
SBAS-InSAR
surface deformation
groundwater level
ecological water replenishment
