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Full-Text Articles in Physical Sciences and Mathematics
Complex Dielectric Permittivity Measurements From Ground-Penetrating Radar Data To Estimate Snow Liquid Water Content In The Pendular Regime, John H. Bradford, Joel T. Harper, Joel Brown
Complex Dielectric Permittivity Measurements From Ground-Penetrating Radar Data To Estimate Snow Liquid Water Content In The Pendular Regime, John H. Bradford, Joel T. Harper, Joel Brown
Geosciences Faculty Publications
Monitoring the snow water equivalent (SWE) is critical to effective management of water resources in many parts of the world that depend on the mountain snowpack for water storage. There are currently no methods to remotely sense SWE with accuracy over large lateral distances in the steep and often forested terrain of mountain basins. Previous studies have shown that measurements of ground-penetrating radar (GPR) velocity can provide accurate estimates of SWE in dry snow. Introduction of liquid water into the snowpack results in a three-phase system that cannot be accurately characterized with GPR velocity alone. We show that measuring the …
Continuous Profiles Of Electromagnetic Wave Velocity And Water Content In Glaciers: An Example From Bench Glacier, Alaska, Usa, John H. Bradford, Joshua Nichols, T. Dylan Mikesell, Joel T. Harper
Continuous Profiles Of Electromagnetic Wave Velocity And Water Content In Glaciers: An Example From Bench Glacier, Alaska, Usa, John H. Bradford, Joshua Nichols, T. Dylan Mikesell, Joel T. Harper
Geosciences Faculty Publications
We conducted two-dimensional continuous multi-offset georadar surveys on Bench Glacier, south-central Alaska, USA, to measure the distribution of englacial water. We acquired data with a multi channel 25 MHz radar system using transmitter-receiver offsets ranging from 5 to 150 m. We towed the radar system at 5-10 kmh-1 with a snow machine with transmitter/receiver positions established by geodetic-grade kinematic deferentially corrected GPS (nominal 0.5 m trace spacing). For radar velocity analyses, we employed reflection tomography in the pre-stack depth-migrated domain to attain an estimated 2% velocity uncertainty when averaged over three to five wavelengths. We estimated water content from …
Tailings Tale: Mike Horse Looms Dark Over The Blackfoot, Elizabeth L. Harrison
Tailings Tale: Mike Horse Looms Dark Over The Blackfoot, Elizabeth L. Harrison
Graduate Student Portfolios, Professional Papers, and Capstone Projects
In the spring of 1975, a heavy rain blew out an earthen dam holding back toxic metal waste from the now defunct Mike Horse mine at the headwaters of the scenic Big Blackfoot River. Federal agencies, a corporate mining giant, and the small town community of Lincoln, Montana, grapple with the repercussions and future of the watershed.