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Characterization approaches using ground-penetrating radar and hydrological measurements in variably saturated porous media

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Characterization approaches using ground-penetrating radar and hydrological measurements in variably saturated porous media
作者:	Kowalsky, Michael Brendan.
面頁冊數:	194 p.
附註:	Chair: Yoram Rubin.
附註:	Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0624.
Contained By:	Dissertation Abstracts International65-02B.
標題:	Hydrology.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3121559
ISBN:	049668910X

Characterization approaches using ground-penetrating radar and hydrological measurements in variably saturated porous media
Kowalsky, Michael Brendan.

Characterization approaches using ground-penetrating radar and hydrological measurements in variably saturated porous media [electronic resource] - 194 p.

Chair: Yoram Rubin.

Thesis (Ph.D.)--University of California, Berkeley, 2003.

An overview of GPR methods is given, including reviews of previous applications and of techniques for simulating GPR measurements, and is followed by a series of case studies. Comparison of real field data and simulations performed with an outcrop-derived model under various states of water saturation shows that the detectability of some sedimentary units depends on in-situ moisture conditions. Then, the simultaneous simulation of GPR surveys and transient flow shows that time-lapsed measurements offer information that might be useful for inferring hydrological parameter distributions in the vadose zone. An inverse technique is then presented which allows for the estimation of actual flow parameters using GPR and hydrological measurements collected during transient flow experiments. This approach employs concepts from the pilot point method in a maximum a posteriori (MAP) framework to allow for estimation of the non-uniform permeability field and other uniform flow parameters. Through a synthetic example (with a simplified model for calculating GPR-inferred values of water saturation), the joint use of transient GPR and other data types is found to be useful for parameter estimation. The method is then extended to allow for the simulation of actual GPR travel times for complex data collection configurations. Finally, inversion of field data collected during an infiltration test in Hanford, Washington, allows for the strengths and limitations of the approach to be explored with real data in a three-dimensional setting.

ISBN: 049668910XSubjects--Topical Terms:

196201
Hydrology.

Characterization approaches using ground-penetrating radar and hydrological measurements in variably saturated porous media
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500 $a Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0624.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2003.
520 # $a An overview of GPR methods is given, including reviews of previous applications and of techniques for simulating GPR measurements, and is followed by a series of case studies. Comparison of real field data and simulations performed with an outcrop-derived model under various states of water saturation shows that the detectability of some sedimentary units depends on in-situ moisture conditions. Then, the simultaneous simulation of GPR surveys and transient flow shows that time-lapsed measurements offer information that might be useful for inferring hydrological parameter distributions in the vadose zone. An inverse technique is then presented which allows for the estimation of actual flow parameters using GPR and hydrological measurements collected during transient flow experiments. This approach employs concepts from the pilot point method in a maximum a posteriori (MAP) framework to allow for estimation of the non-uniform permeability field and other uniform flow parameters. Through a synthetic example (with a simplified model for calculating GPR-inferred values of water saturation), the joint use of transient GPR and other data types is found to be useful for parameter estimation. The method is then extended to allow for the simulation of actual GPR travel times for complex data collection configurations. Finally, inversion of field data collected during an infiltration test in Hanford, Washington, allows for the strengths and limitations of the approach to be explored with real data in a three-dimensional setting.
520 # $a Modeling the flow of water or the transport of contaminants through the subsurface requires the characterization of soil properties including permeability, porosity, and water retention. Such hydrological parameters are commonly heterogeneous, and uncertainty in their spatial distributions makes it difficult to construct hydrological models from only point measurements, which are commonly limited since their collection is expensive, time consuming and invasive. The application of geophysical methods offers a promising alternative for inferring hydrological properties in the subsurface.
520 # $a The focus of this dissertation is on a variety of applications of ground penetrating radar (GPR), a geophysical method that provides data non-invasively (or minimally invasively) with high spatial resolution and at low cost. While GPR data are increasingly used in shallow subsurface characterization, relations between such data and subsurface flow processes are poorly understood. The research presented in this dissertation stems from the need for (1) a better understanding of GPR data in relation to non-uniform and transient distributions of pore water, and (2) an approach relating GPR attributes, possibly in combination with additional data types, to hydrological parameters.
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