Loading...
Please wait, while we are loading the content...
Similar Documents
Fresnel Volume Ground Penetrating Radar Attenuation Difference Tomography and Incorporating Geostatistical Constraints in Nonlinear Inverse Problems
| Content Provider | Semantic Scholar |
|---|---|
| Author | Johnson, Timothy C. |
| Copyright Year | 2006 |
| Abstract | The role of geophysics in the characterization and monitoring of hydrological systems is rapidly expanding to advance the understanding of fluid flow in the Earth. The non-invasive probing of the subsurface using different geophysical methods provides a wide range of possibilities to study the static and dynamic nature of subsurface flow systems. Water resource management is both a local and global concern. Fate and transport of contaminants, environmental remediation, and contaminant monitoring require accurate and spatially extensive knowledge of the heterogeneous subsurface. Direct measurements using borehole techniques are accurate but lack sufficient spatial coverage to determine hydraulic parameters at a large scale. In this thesis I focus on two broad areas: (a) improvement of the physics in tomographic imaging using cross-hole ground-penetrating radar and (b) development of a methodology to incorporate geostatistical scale information into the geophysical images that naturally leads to uncertainty estimation in a statistical sense. Although this method is applicable do inverse problems in general, it is demonstrated in conjunction with a ground-penetrating radar velocity tomography problem. Tomography, a commonly used method in exploration geophysics, is increasingly used in near-surface applications to determine property distributions such as the seismic or radar velocity of the material traversed by propagating seismic or electromagnetic energy. Near-surface investigations using tomographic methods pose significant scientific challenges in terms of determining the uncertainty in the geophysical parameter estimates. This difficulty results from the less-than-optimal coverage needed to image the desired scale of the heterogeneity and infinite frequency assumption that is the basis for commonly used ray theoretical radar tomograms. I examine the attenuation responses |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://d25vtythmttl3o.cloudfront.net/uploads/sites/290/2020/01/Johnson-TC-2006-Fresnel_volume_ground_penetrat.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
