Method for inverting underground fluid volume change and three dimension surface deformation using InSAR

A technology of underground fluid and surface deformation, applied in the direction of re-radiation, radio wave reflection/re-radiation, measuring devices, etc., can solve problems such as difficult to monitor three-dimensional surface deformation

Active Publication Date: 2015-12-16
CENT SOUTH UNIV
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However, according to the above analysis, it is currently difficult for InSAR technology to be w

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  • Method for inverting underground fluid volume change and three dimension surface deformation using InSAR
  • Method for inverting underground fluid volume change and three dimension surface deformation using InSAR
  • Method for inverting underground fluid volume change and three dimension surface deformation using InSAR

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[0044] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0045] In order to facilitate understanding of the present invention, at first the theoretical basis of the present invention is provided:

[0046] Such as figure 2 As shown, according to the elastic half-space theory, the volume change of the subsurface fluid will cause the deformation of the surface, and the relationship between the two satisfies:

[0047] d l (x) = ∫ V G l (x,y)D V (y)dy(1)

[0048] where d l (x) is the deformation of the observation point x on the ground, l=1, 2, 3 respectively represent the three components of east-west, north-south and vertical upward; D V (y) is the fluid volume change of block source y in the underground half-space volume V; G l (x,y) is the Green function,

[0049] G l ( x , y ) = ...

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Abstract

The invention discloses a method for inverting underground fluid volume change and three dimension surface deformation using InSAR. For an area influenced by underground fluid motions, firstly, the InSAR technology is utilized to obtain a measurement value of a surface deformation field in a slope distance direction after geographical coding of the area; then InSAR slope distance direction deformation measurement values are utilized to invert depth and thickness of an underground fluid block source in a nonlinear manner; further a combined solution model is established for all surface observation points and the underground fluid block source using satellite imaging geometry and elastic half-space theories; and finally, the least square method is used for computing three dimension deformation of the surface observation points and volume change of the underground fluid block source. The invention breaks through the technical difficulty that InSAR cannot precisely monitor three dimension deformation caused by underground fluid motions, and actively promotes practical development of the InSAR technology. In addition, the invention can obtain results about underground fluid volume change, and can provide important scientific values for reach on the geophysical process inside the earth.

Description

technical field [0001] The invention belongs to the field of geodesy based on remote sensing images, in particular to a method for retrieving underground fluid volume change and three-dimensional surface deformation by using InSAR. Background technique [0002] Differential InSAR (DifferentialInSAR, D-InSAR) technology is currently the most mature technology in the application of InSAR in the world. Its main purpose is to monitor the deformation of the earth's surface at the centimeter or even millimeter level. Multi-temporal InSAR (Multi-Temporal InSAR, MT-InSAR) technology is a surface deformation monitoring method developed on the basis of D-InSAR technology in the past 20 years, such as PS, SBAS and TCP. Through the joint analysis of multi-view SAR images, MT-InSAR technology can better suppress the influence of space-time de-correlation and atmospheric noise in the interferogram, and can provide the deformation sequence of the surface at the time of SAR image acquisitio...

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/885G01S13/9023
Inventor 胡俊丁晓利李志伟朱建军
Owner CENT SOUTH UNIV
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