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Person

Nora C Nelson

Hydrologist
Nevada Water Science Center

Email: ncnelson@usgs.gov
Office Phone: 775-887-7674
Fax: 775-887-7602
ORCID: 0000-0001-8248-2004

Location
USGS NVWSC Building
2730 N. Deer Run Road Suite 3
Carson City , NV 89701
US

Supervisor: Jena M Huntington
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This U.S. Geological Survey (USGS) data release consists of data from two tracer investigations in the Snake Creek drainage of Great Basin National Park, White Pine County, Nevada. The first investigation, occurring from April to September 2019, involved injecting a fluorescein dye tracer below a diversion point in Snake Creek and monitoring 13 sites in the Snake Creek and neighboring Big Wash drainages for presence of the dye. The results of the first investigation were used to select a targeted monitoring location for a second, quantitative investigation. The second investigation, occurring from September 2020 to March 2021, involved injecting two tracers, sodium bromide and fluorescein dye, below the same diversion...
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The electrical conductivity of the earth is used to help infer lithological and pore fluid properties. Various geophysical methods can provide estimates of the distribution of below ground electrical conductivity, with each method having certain limitations. This data release presents raw and processed results from land-based and water-based frequency domain electromagnetic induction imaging (EMI) data collected from March 31 to April 2, 2015. Data were primarily collected by walking throughout the wetland and riparian zones with the GEM-2 instrument (Geophex, Ltd.) at approximately 1 m off the ground in horizontal coplanar (ski flat) mode. A survey along a section of the Colorado River in a kayak was also collected...
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Electrical Geophysical Data Collected in the Scott M. Matheson Wetlands Preserve Near Moab, Utah
Quantitative evaluation of groundwater/surface water exchange dynamics is universally challenging in large river systems, because existing physical methodology often does not yield spatially-distributed data and is difficult to utilize in deeper water. Here we apply combined frequency domain electromagnetic induction (EMI) and direct contact vertical electrical sounding (VES) measurements to identify shallow, fresh groundwater discharge to the Colorado River through a 4 km2 wetland that borders the town of Moab, Utah, USA. EMI data were collected by a mobile tool that was hand carried or floated on the back of a kayak, providing extensive spatial coverage for the upper approximate 5 m of river channel/sediments....
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This Data Release serves as a repository for a set of time-series data used in Scientific Investigations Report 2018-5040. The data represent continuous measurements of specific conductance, water temperature, and/or water level (stage), recorded by a variety of types of data loggers during three multi-day interference tests conducted on the Virgin River at Pah Tempe Springs during November 2013, February 2014, and November 2014. The data presented are the raw data downloaded from the data loggers and are organized according to the date of the test and the type and name of the observation site. The Data Release contains 3 items: 1. An explanatory table, "PahTempe_table1.xlsx", which indicates which parameters...
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Vertical electrical soundings (VES) are used to develop depth-resolved models of aquifer resistivity by making electrical potential measurements at increasingly larger electrode spacing, with the array centered around a common point. Variations in modeled electrical resistivity with depth can be used to infer groundwater salinity and preferential fresh groundwater flow zones. Each of the 4 VES measurement integrates approximately 11 individual electrical soundings with 4 electrodes driven into the soil in a linear Wenner array with electrode spacings ranging from 1 to 40 m. Data were collected manually with a SuperSting electrical resistivity meter (AGI - Advanced Geosciences, Inc) and recorded by hand in a field...
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