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The accuracy of water table elevatio...

Trenholm, Nicole Marie.

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The accuracy of water table elevation estimates determined from ground-penetrating radar data.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	The accuracy of water table elevation estimates determined from ground-penetrating radar data./
作者:	Trenholm, Nicole Marie.
面頁冊數:	196 p.
附註:	Adviser: L. R. Bentley.
Contained By:	Masters Abstracts International39-03.
標題:	Geophysics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=MQ55289
ISBN:	0612552896

The accuracy of water table elevation estimates determined from ground-penetrating radar data.
Trenholm, Nicole Marie.

The accuracy of water table elevation estimates determined from ground-penetrating radar data. - 196 p.

Adviser: L. R. Bentley.

Thesis (M.Sc.)--University of Calgary (Canada), 2000.

In hydrogeologic investigations, water table elevations measured at sparsely distributed monitoring wells are used to interpolate the water table surface for a field site. Ground penetrating radar is one non-invasive technique which have been used to estimate water table elevations between monitoring wells. The accuracy of these estimates is effected by numerous sources of error, including surface elevations, GPR wave velocity, spatial velocity variations, capillary rise estimates and the time sampling interval. We have identified and quantified these uncertainties at two sites. When the sources of error are minimized, the uncertainty in water table elevation estimates from GPR data is ±0.10 to 0.15 m. At a third site, we were unable to obtain a reflection from the water table on the GPR sections. However, a non-linear, inverse relationship between the depth to the brackish water table and the apparent conductivity values measured with a Geonics EM-31 system was found, showing that the unsaturated zone has a conductivity of approximately 6 mS/m. Therefore, poor GPR data quality at this site cannot be attributed to the conductivity of the unsaturated zone.

ISBN: 0612552896Subjects--Topical Terms:

535228
Geophysics.

The accuracy of water table elevation estimates determined from ground-penetrating radar data.
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520 $a In hydrogeologic investigations, water table elevations measured at sparsely distributed monitoring wells are used to interpolate the water table surface for a field site. Ground penetrating radar is one non-invasive technique which have been used to estimate water table elevations between monitoring wells. The accuracy of these estimates is effected by numerous sources of error, including surface elevations, GPR wave velocity, spatial velocity variations, capillary rise estimates and the time sampling interval. We have identified and quantified these uncertainties at two sites. When the sources of error are minimized, the uncertainty in water table elevation estimates from GPR data is ±0.10 to 0.15 m. At a third site, we were unable to obtain a reflection from the water table on the GPR sections. However, a non-linear, inverse relationship between the depth to the brackish water table and the apparent conductivity values measured with a Geonics EM-31 system was found, showing that the unsaturated zone has a conductivity of approximately 6 mS/m. Therefore, poor GPR data quality at this site cannot be attributed to the conductivity of the unsaturated zone.
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