U. S. Geological Survey Toxic Substances Hydrology Program--Abstracts of the Technical Meeting, Colorado Springs, Colorado, September 20-24, 1993

The U.S. Geological Survey, in cooperation with the Kentucky Natural Resources and Environmental Protection Cabinet, constructed a two-dimensional, steady-state ground-waterflow model to estimate hydraulic properties, contributing areas to discharge boundaries, and the average linear velocity at selected locations in an aquifer system near Calvert City, Ky. Nonlinear regression was used to estimate values of model parameters and their reliability. The regression minimizes the weighted difference between observed and calculated hydraulic heads and rates of flow. The calibrated model generally was better than alternative models considered, and although adding transmissive faults in the bedrock produced a slightly better model, fault transmissivity was not estimated reliably. The average transmissivity of the aquifer was 20,000 feet squared per day. Estimated recharge to two outcrop areas, the Cretaceous McNairy Formation and the Quaternary alluvium, was 0.00269 feet per day (11.8 inches per year) and 0.000484 feet per day (2.1 inches per year), respectively. Contributing areas to wells at the Calvert City Water Company in 1992 did not include the Calvert City Industrial Complex. Since completing the field work for this study in 1992, the Calvert City Water Company discontinued use of its wells and began withdrawing water from new wells that were located 4.5 miles east-southeast of the previous location; the contributing area for these new wells moved farther from the industrial complex. The extent of the alluvium contributing water to wells was limited by the overlying lacustrine deposits. The average linear groundwater velocity at the industrial complex ranged from 0.90 to 4.47 feet per day with a mean of 1.98 feet per day.

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Direct Inversion Method of Fault Slip Analysis to Determine the Orientation of Principal Stresses and Relative Chronology for Tectonic Events in Southwestern White Mountain Region of New Hampshire, USA

Barton

Angelier

2020

Geosciences

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The orientation and relative magnitudes of paleo tectonic stresses in the western central region of the White Mountains of New Hampshire is reconstructed using the direct inversion method of fault slip analysis on 1–10-m long fractures exposed on a series of road cuts along Interstate 93, just east of the Hubbard Brook Experimental Forest in North Woodstock, NH, USA. The inversion yields nine stress regimes which identify five tectonic events that impacted the White Mountain region over the last 410 Ma. The inversion method has potential application in basin analysis.

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U. S. Geological Survey Toxic Substances Hydrology Program--Abstracts of the Technical Meeting, Colorado Springs, Colorado, September 20-24, 1993

Abstract: Bemidji Multiphase-flow modeling at the Bemidji, Minnesota, crude-oil spill site with geostatistical simulation of hydraulic properties, by Leslie A. .J2.illm:d, Hedeff I. ~.

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Long-Term Evolution of Biodegradation and Volatilization Rates in a Crude Oil-Contaminated Aquifer

Long-Term Evolution of Biodegradation and Volatilization Rates in a Crude Oil-Contaminated Aquifer

Geohydrology and simulation of ground-water flow in the aquifer system near Calvert City, Kentucky

Direct Inversion Method of Fault Slip Analysis to Determine the Orientation of Principal Stresses and Relative Chronology for Tectonic Events in Southwestern White Mountain Region of New Hampshire, USA

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