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Geophysical Characterization of the American River Levees, Sacramento, California, Using Electromagnetics, Capacitively Coupled Resistivity, and DC Resistivity: Usgs Open-File Report 2008-1109

Geophysical Characterization of the American River Levees, Sacramento, California, Using Electromagnetics, Capacitively Coupled Resistivity, and DC Resistivity: Usgs Open-File Report 2008-1109

          
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A geophysical characterization of a portion of American River levees in Sacramento, California was conducted in May, 2007. Targets of interest included the distribution and thickness of sand lenses that underlie the levees and the depth to a clay unit that underlies the sand. The concern is that the erosion of these sand lenses can lead to levee failure in highly populated areas of Sacramento. DC resistivity (Geometric's OhmMapper and Advanced Geosciences, Inc.'s SuperSting R8 systems) and electromagnetic surveys (Geophex's GEM-2) were conducted over a 6 mile length of the levee on roads and bicycle and horse trails. 2-D inversions were conducted on all the geophysical data. The OhmMapper and SuperSting surveys produced consistent inversion results that delineated potential sand and clay units. GEM-2 apparent resistivity data were consistent with the DC inversion results. However, the GEM-2 data could not be inverted due to low electromagnetic response levels, high ambient electromagnetic noise, and large system drifts. While this would not be as large a problem in conductive terrains, it is a problem for a small induction number electromagnetic profiling system such as the GEM-2 in a resistive terrain (the sand lenses). An integrated interpretation of the geophysical data acquired in this investigation is presented in this report that includes delineation of those areas consisting of predominantly sand and those areas consisting predominantly of clay. In general, along most of this part of the American River levee system, sand lenses are located closest to the river and clay deposits are located further away from the river. The interpreted thicknesses of the detected sand deposits are variable and range from 10 ft up to 60 ft. Thus, despite issues with the GEM-2 inversion, this geophysical investigation successfully delineated sand lenses and clay deposits along the American River levee system and the approximate depths to underlying clay zones. The results of thi


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Product Details
  • ISBN-13: 9781288713721
  • Publisher: Bibliogov
  • Publisher Imprint: Bibliogov
  • Height: 246 mm
  • No of Pages: 26
  • Series Title: English
  • Sub Title: Usgs Open-File Report 2008-1109
  • Width: 189 mm
  • ISBN-10: 128871372X
  • Publisher Date: 06 Feb 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 1 mm
  • Weight: 68 gr


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Geophysical Characterization of the American River Levees, Sacramento, California, Using Electromagnetics, Capacitively Coupled Resistivity, and DC Resistivity: Usgs Open-File Report 2008-1109
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