Conference Papers
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Effectiveness of the addition of alkaline materials at surface coal mines in preventing or abating acid mine drainage--Part 1. Geochemical considerations Effectiveness of the addition of alkaline materials at surface coal mines in preventing or abating acid mine drainage--Part 1. Geochemical considerations
The addition of alkaline materials to supplement deficient "neutralization potential" (NP) of mine spoil, and thus to prevent or abate acid mine drainage, has riot been successful at most surface coal mines in Pennsylvania. A basic problem may have been improper accounting for acid‐production potential and thus inadequate addition rates of calcium carbonate (CaCO3 ), calcium oxide (CaO)...
Authors
Charles A. Cravotta, Keith Brady, Michael W. Smith, Richard L. Beam
Effectiveness of the addition of alkaline materials at surface coal mines in preventing or abating acid mine drainage--Part 2. Mine site case studies Effectiveness of the addition of alkaline materials at surface coal mines in preventing or abating acid mine drainage--Part 2. Mine site case studies
The effectiveness of preventing or ameliorating acid mine drainage (AMD) through the application of alkaline additives is evaluated for eight surface coal mines in Pennsylvania. Many of the mine sites had overburden characteristics that made prediction of post‐mining water quality uncertain. Alkaline materials were applied at rates ranging from 42 to greater than 1,000 tons as calcium...
Authors
Keith Brady, Michael W. Smith, Richard L. Beam, Charles A. Cravotta
Methods of measurement of exploratory well impacts, offshore Florida Methods of measurement of exploratory well impacts, offshore Florida
Six offshore oil well tests were drilled off Key West in the late 1950s and early 1960s. Two wells were drilled on coral bottom, two on carbonate sand, and two on mixed turtle grass and gorgonian/sponge hardbottom. After locating the sites with a proton magnetometer; several underwater assessment methods were used to measure the ecological impacts of drilling. Because of differing...
Authors
Phillip A. Dustan, Jack L. Kindinger, B. H. Lidz, J.H. Hudson
Offshore and onshore sediment resource delineation and usage for coastal erosion control in Louisiana: The Isles Dernieres and Plaquemines barrier systems Offshore and onshore sediment resource delineation and usage for coastal erosion control in Louisiana: The Isles Dernieres and Plaquemines barrier systems
No abstract available.
Authors
S. Penland, J. Mossa, R.A. McBride, K. Ramsey, J.R. Suter, C.G. Groat, S.J. Williamson
Reevaluation of large-scale dispersivities for a waste chloride plume: Effects of transient flow Reevaluation of large-scale dispersivities for a waste chloride plume: Effects of transient flow
This paper investigates the effects of transient groundwater flow on dispersion of a waste chloride plume in the basaltic aquifer beneath the Idaho (USA) National Engineering Laboratory. In an early application of numerical modeling techniques to the two-dimensional simulation of field-scale plumes, previous investigators identified longitudinal and transverse dispersivities using an...
Authors
Daniel J. Goode, Leonard F. Konikow
Selected geographic analysis projects: U. S. Fish and Wildlife Service's National Wetlands Research Center Selected geographic analysis projects: U. S. Fish and Wildlife Service's National Wetlands Research Center
No abstract available.
Authors
Floyd O. Stayner, James D. Scurry, James B. Johnston, Mary C. Watzin, Pasquale F. Roscigno
The New Ireland Basin; a frontier basin in Papua New Guinea The New Ireland Basin; a frontier basin in Papua New Guinea
No abstract available.
Authors
N.F. Exon, Michael S. Marlow
Development of an aquifer management model AQMAN3D Development of an aquifer management model AQMAN3D
A computer code that enables the use of the USGS Modular groundwater flow model for aquifermanagement modeling has been developed. Aquifermanagement techniques integrate groundwater flow modeling with linear quadratic optimization methods for the solution of various aquifer management problems. The model AQMAN3D, is a modified version of a previously developed two-dimensional AQMAN model...
Authors
Juan Carlos Puig, L. I. Rolon-Collazo, Ishmael Pagan-Trinidad
Field trip guide - American Water Resources Association Field trip guide - American Water Resources Association
No abstract available.
Authors
Matthew C. Larsen, Thalia D. Veve
Landslide processes in saprolitic soils of a tropical rain forest, Puerto Rico Landslide processes in saprolitic soils of a tropical rain forest, Puerto Rico
Shallow soil slips, earth and debris slides appear to be a primary mechanism of hillslope denudation in the rainforest of eastern Puerto Rico. Annual rainfall in excess of 4,000 mm, and thick sequences (up to 20 m) of residual soils (saprolite) combine to produce these landslides. Shear strength testing and observatons of tension cracks indicate that landslides may start as tensile...
Authors
Matthew C. Larsen, Andrew Simon
Rainfall-soil moisture relations in landslide-prone areas of a tropical rain forest, Puerto Rico Rainfall-soil moisture relations in landslide-prone areas of a tropical rain forest, Puerto Rico
Soil moisture conditions are not well documented in steep, tropical landslide-prone terrain. In the 11,330 ha Caribbean National Forest (CNF) in northeastern Puerto Rico more than 170 landslides that occurred from one to approximately 60 years ago have been mapped. Most of these landslides are shallow, with failure depths of 0.5 ot 7 m, and are associated with periods of intense...
Authors
Matthew C. Larsen, Angel J. Torres-Sanchez