Steady-state simulation of ground-water flow conditions in the Kingshill aquifer, St. Croix, U.S. Virgin Islands
Sigfredo Torres-Gonzalez
Fernando Gomez-Gomez, Vicente Quinones-Aponte, A.I. Johnson, editor(s)
1991, Conference Paper, AWRA Monograph Series no. 15
Water-resources development and its influence on the water budget for the aquifer system in the Salinas to Patillas area
Vicente Quinones-Aponte
Fernando Gomez-Gomez, A.I. Johnson, editor(s)
1991, Conference Paper, Regional aquifer systems of the United States, aquifers of the Caribbean Islands : papers presented at AWRA International Symposium on Tropical Hydrology
Quartz dissolution in organic-rich aqueous systems
Philip C. Bennett
1991, Geochimica et Cosmochimica Acta (55) 1781-1797
Organic electrolytes are a common component of natural waters and are known to be important in many rock-water interactions. The influence of organic electrolytes on silica mobility, quartz solubility, and quartz dissolution kinetics, however, is less well understood. While there is mounting evidence supporting the presence of an aqueous organic-silica...
Variability of an unsaturated sand unit underlying a radioactive- waste trench
Richard W. Healy, Patrick C. Miller
1991, Soil Science Society of America Journal (55) 899-907
Properties of soils vary considerably within any field. This study was conducted to investigate the variability in properties of an unsaturated sand unit that lies at a depth of 13 m below land surface. Four-hundred-forty soil core samples, obtained from a 1.75 by 18-m horizontal plane within a sand unit...
Collimated neutron probe for soil water content measurements
J.M. Klenke, Alan L. Flint
1991, Soil Science Society of America Journal (55) 916-923
The use of uncollimated (undirected) neutron moisture meters is common in the biological and geophysical sciences. A collimated neutron probe was designed to enable measurements in specific directions from the access tube. To determine the size and shape of soil volume affecting the neutron counts, experiments were conducted to evaluate:...
Open marsh water management in the mid-Atlantic region: Aerial surveys of waterbird use
R.M. Erwin, D.K. Dawson, Daniel B. Stotts, L.S. McAllister, P.H. Geissler
1991, Wetlands (11) 209-228
Nine marsh sites were selected in Maryland, Delaware, and New Jersey to assess the importance of ponds created by Open Marsh Water Management (OMWM) to migratory birds. At eight of the nine sites, OMWM ponds were paired with areas of similar-sized natural ponds. Eleven aerial surveys were conducted,...
Gages for measuring fluvial-sediment concentration
J. V. Skinner, J.J. Szalona
1991, Conference Paper
No abstract available....
Mechanisms controlling the transport of organic chemicals in subsurface environments
G. R. Aiken, P. D. Capel, E. T. Furlong, M. F. Hult, K. A. Thorn
1991, Book chapter, U.S. Geological Survey Toxic Substances Hydrology Program---Proceedings of the technical meeting, Monterey, California, March 11-15, 1991
No abstract available....
Seasonal variations of carbon dioxide concentrations in stony, coarse-textured desert soils of southern Nevada, USA
Christina L. Terhune, Jennifer W. Harden
1991, Soil Science (151) 417-429
Knowledge of carbon dioxide concentration in desert soils is required in theoretical models of the development of pedogenic and ground-water calcium carbonate. Most studies have concentrated on medium- to fine-textured soils in temperate to humid environments. Very little data exist for CO2 concentrations in stony, coarse-textured deposits such as those making...
Agricultural research to improve water quality
C.A. Onstad, M. R. Burkart, G.D. Bubenzer
1991, Journal of Soil and Water Conservation (46) 184-188
ime courses for ingest~on, retention and release via feces of microbial food was investigatedusing 2 b~valves w~th d~fferent feeding strategies, Potamocorbula amurensis and Macomabalthica. The results showed 2 pathways for the uptake of food material in these clams. The first isrepresented by an initlal label pulse in the feces....
Centrifugal techniques for measuring saturated hydraulic conductivity
John R. Nimmo, Karen A. Mello
1991, Water Resources Research (27) 1263-1269
Centrifugal force is an alternative to large pressure gradients for the measurement of low values of saturated hydraulic conductivity (Ksat). With a head of water above a porous medium in a centrifuge bucket, both constant-head and falling-head measurements are practical at forces up to at least 1800 times normal gravity....
Rotenone persistence in freshwater ponds: Effects of temperature and sediment adsorption
V. K. Dawson, W.H. Gingerich, R. A. Davis, P.A. Gilderhus
1991, North American Journal of Fisheries Management (11) 226-231
The persistence of rotenone was compared between a cement-lined pond (0.04 hectare) and an earthen-bottom pond (0.02 hectare) treated with 5 μL Noxfish/L (250 μg rotenone/L) during spring, summer, and fall. Water temperatures on the days of treatment in each season were 8, 22, and 15°C, respectively. Both ponds were...
Sampling design for groundwater solute transport: Tests of methods and analysis of Cape Cod tracer test data
Debra S. Knopman, Clifford I. Voss, Stephen P. Garabedian
1991, Water Resources Research (27) 925-949
Tests of a one-dimensional sampling design methodology on measurements of bromide concentration collected during the natural gradient tracer test conducted by the U.S. Geological Survey on Cape Cod, Massachusetts, demonstrate its efficacy for field studies of solute transport in groundwater and the utility of one-dimensional analysis. The methodology was applied...
Large-scale natural gradient tracer test in sand and gravel, Cape Cod, Massachusetts: 1. Experimental design and observed tracer movement
Denis R. LeBlanc, Stephen P. Garabedian, Kathryn M. Hess, Lynn W. Gelhar, Richard D. Quadri, Kenneth G. Stollenwerk, Warren W. Wood
1991, Water Resources Research (27) 895-910
A large-scale natural gradient tracer experiment was conducted on Cape Cod, Massachusetts, to examine the transport and dispersion of solutes in a sand and gravel aquifer. The nonreactive tracer, bromide, and the reactive tracers, lithium and molybdate, were injected as a pulse in July 1985 and monitored in three dimensions...
Large-scale natural gradient tracer test in sand and gravel, Cape Cod, Massachusetts: 2. Analysis of spatial moments for a nonreactive tracer
Stephen P. Garabedian, Dennis R. LeBlanc, Lynn W. Gelhar, Michael A. Celia
1991, Water Resources Research (27) 911-924
A large-scale natural gradient tracer test was conducted to examine the transport of reactive and nonreactive tracers in a sand and gravel aquifer on Cape Cod, Massachusetts. As part of this test the transport of bromide, a nonreactive tracer, was monitored for about 280 m and quantified using spatial moments....
Aquatic habitat measurement and valuation: imputing social benefits to instream flow levels
Aaron J. Douglas, Richard L. Johnson
1991, Journal of Environmental Management (32) 267-280
Instream flow conflicts have been analysed from the perspectives offered by policy oriented applied (physical) science, theories of conflict resolution and negotiation strategy, and psychological analyses of the behavior patterns of the bargaining parties. Economics also offers some useful insights in analysing conflict resolution within the context of these water...
Comment on the treatment of residual water content in “A consistent set of parametric models for the two-phase flow of immiscible fluids in the subsurface” by L. Luckner et al.
John R. Nimmo
1991, Water Resources Research (27) 661-662
Luckner et al. [1989] (hereinafter LVN) present a clear summary and generalization of popular formulations used for convenient representation of porous media fluid flow characteristics, including water content (θ) related to suction (h) and hydraulic conductivity (K) related to θ or h. One essential but problematic element in the LVN...
Construction effects on sediment for two basins in Puerto Rico
Allen C. Gellis
Shou-Shan Fan, Y.-H. Kuo, editor(s)
1991, Conference Paper, Proceedings of the Fifth Federal Interagency Sedimentation Conference
Sedimentation rates and capacity restoration options, Lago Loíza, Puerto Rico
P.D. Collar, Senen Guzman-Rios
1991, Conference Paper, Proceedings of the Fifth Federal Interagency Sedimentation Conference
Structure and depositional patterns and their influence on the hydraulic conductivity of fan-deltas in southern Puerto Rico
Robert A. Renken, Fernando Gomez-Gomez, Vicente Quinones-Aponte, Rafael Dacosta
Fernando Gomez-Gomez, Vicente Quinones-Aponte, A.I. Johnson, editor(s)
1991, Conference Paper, Regional Aquifer Systems of the United States, Aquifers of the Caribbean Islands, American Water Association Monograph Series No. 15
Physical aspects of Hurricane Hugo in Puerto Rico
F.N. Scatena, Matthew C. Larsen
1991, Biotropica (23) 317-323
On 18 September 1989 the western part ofHurricane Hugo crossed eastern Puerto Rico and the Luquillo Experimental Forest (LEF). Storm-facing slopes on the northeastern part of the island that were within 15 km of the eye and received greater than 200 mm of rain were most affected by the storm....
Hydrochemistry of the south coastal plain aquifer system of Puerto Rico and its relation to surface water recharge
Fernando Gomez-Gomez
Fernando Gomez-Gomez, Vicente Quinones-Aponte, A.I. Johnson, editor(s)
1991, Conference Paper, International Symposium on Tropical Hydrology
Minnesota floods and drought
G.H. Carlson
1991, Book chapter, National Water Summary 1988-89: U.S. Geological Survey Water-Supply Paper 2375
No abstract available...
Atmospheric deposition and solute export in giant sequoia: Mixed conifer watersheds in the Sierra Nevada, California
Thomas J. Stohlgren, John M. Melack, Anne M. Esperanza, David J. Parsons
1991, Biogeochemistry (12) 207-230
Atmospheric depostion and stream discharge and solutes were measured for three years (September 1984 — August 1987) in two mixed conifer watersheds in Sequoia National Park, in the southern Sierra Nevada of California. The Log Creek watershed (50 ha, 2067–2397 m elev.) is drained by a perennial stream, while Tharp's...
Structure and depositional patterns and their influence on the hydraulic conductivity of fan-deltas in southern Puerto Rico
Robert A. Renken, Fernando Gomez-Gomez, Vicente Quinones-Aponte, Rafael Dacosta
Fernando Gomez-Gomez, Vicente Quinones-Aponte, A.I. Johnson, editor(s)
1991, Conference Paper, Aquifers of the Caribbean Islands, Proceedings of the International Symposium on Tropical Hydrology
