基于时序InSAR的北京地区地面沉降对地下水开采的响应机理研究

项目名称： 基于时序InSAR的北京地区地面沉降对地下水开采的响应机理研究

项目编号： No.41201376

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 地理学

项目作者： 张有全

作者单位： 首都师范大学

项目金额： 25万元

中文摘要： 以北京平原区为研究区，在现有常规监测网的基础上，开展遥感与水文地质、土力学交叉研究，揭示抽水作用下的地面沉降响应机理。针对大区域、缓慢地表形变干涉测量中轨道误差难以分离这一技术问题，提出采用小波多分辨率分解技术与加权最小二乘法结合，抑制其它误差组分影响，分解、评估轨道误差。在此基础上，分析沉降空间上的演化规律。结合分层观测数据深入分析含水层系统分层介质应力应变关系，建立监测形变与含水层系统水力参数、响应过程的关系模型。评估区域含水层系统水力参数，解决地下水资源评估计算、地面沉降预测中参数不确定性问题。从地下水可更新能力、地层岩性差异、含水层系统介质释水形变特性角度出发，研究残余形变空间分布模式，揭示抽水作用下含水层系统响应的空间各向异性机理。为北京地区地面沉降调控、南水北调客水进京后地下水资源调蓄提供科学数据和理论依据。

中文关键词： 地面沉降；驱动；干涉测量；机理；灾变模式

英文摘要： Using InSAR and hydrogeologic time-series from 1991 to 2010, we characterize the hydraulic properties and the mechanism which land subsidence response to overdraft in Beijing area. The region is a unconsolidated, heterogeneous aquifer systems that supplies groundwater to Beijing. Current application of satellite interferometry to estimate aquifer hydraulic properties over large area is limited by the orbital error. It can propagate to the deformation data analysis and may even entirely obscure the interpretation. In this project, we present a new method that combines wavelet multiresolution analysis and least square to distinguish between the orbital errors and other components (e.g., atmospheric signal). Base on the 5 extensometer data, we analysis the stress-strain of aquifer system. This study aims to formalize the integration of InSAR results, storage, time, idual compaction and groundwater level time-series. Then we try to estimates the hydraulic properties (compressibility nd storage) in multi-aquifer system. All these results can help us reveal the spatial pattern and the mechanism of aquifer system. The study results can quantity be used to migrate the land subsidence in Beijing. And the results can be used to manage the regional groundwater to assure aquifer sustainability especially when the water of S

英文关键词： Land Subsidence；Drive；Interferometry；Mechanism；Evolution pattern