Application of XTOP_PRMS model in Green Lakes Valley, Colorado front range: Runoff simulation and flowpath identification
F. Liu, Murray Williams, R. Webb, T. Ackerman
2002, Conference Paper, Proceedings of The Western Snow Conference
Stream runoff was simulated from 1996 to 2000 using XTOP_PRMS (coupling of TOPMODEL and Precipitation Runoff Modeling System) model under Modular Modeling System at Martinelli and Green Lake 4 catchments in Green Lakes Valley, Colorado Front Range. Two flowpaths determined by XTOP_PRMS model, surface flow (infiltration-excess overland flow) and subsurface...
Transport of suspended solids from a karstic to an alluvial aquifer: The role of the karst/alluvium interface
N. Massei, M. Lacroix, H.Q. Wang, B.J. Mahler, J.P. Dupont
2002, Journal of Hydrology (260) 88-101
This study focuses on the coupled transport of dissolved constituents and particulates, from their infiltration on a karst plateau to their discharge from a karst spring and their arrival at a well in an alluvial plain. Particulate markers were identified and the transport of solids was characterised in situ in...
Multispecies reactive tracer test in an aquifer with spatially variable chemical conditions, Cape Cod, Massachusetts: Dispersive transport of bromide and nickel
Kathryn M. Hess, James A. Davis, Douglas B. Kent, Jennifer A. Coston
2002, Water Resources Research (38) 36-1-36-17
Dispersive transport of groundwater solutes was investigated as part of a multispecies reactive tracer test conducted under spatially variable chemical conditions in an unconfined, sewage‐contaminated sand and gravel aquifer on Cape Cod, Massachusetts. Transport of the nonreactive tracer bromide (Br) reflected physical and hydrologic processes. Transport of the reactive tracer...
Effects of a coastal golf complex on water quality, periphyton, and seagrass
M.A. Lewis, R.G. Boustany, D.D. Dantin, R.L. Quarles, J.C. Moore, R. S. Stanley
2002, Ecotoxicology and Environmental Safety (53) 154-162
The objective of this study was to provide baseline information on the effects of a golf course complex on water quality, colonized periphyton, and seagrass meadows in adjacent freshwater, near-coastal, and wetland areas. The chemical and biological impacts of the recreational facility, which uses reclaimed municipal wastewater for irrigation, were...
Effect of adsorbed metals ions on the transport of Zn- and Ni-EDTA complexes in a sand and gravel aquifer
D.B. Kent, J.A. Davis, L.C.D. Anderson, B.A. Rea, J.A. Coston
2002, Geochimica et Cosmochimica Acta (66) 3017-3036
Adsorption, complexation, and dissolution reactions strongly influenced the transport of metal ions complexed with ethylenediaminetetraacetic acid (EDTA) in a predominantly quartz-sand aquifer during two tracer tests conducted under mildly reducing conditions at pH 5.8 to 6.1. In tracer test M89, EDTA complexes of zinc...
Middle Palaeolithic refugium, or archaeological misconception? A new U-Series and radiocarbon chronology of Abric Agut (Capellades, Spain)
Manola Vaquero, M. Esteban, E. Allue, J. Vallverdu, E. Carbonell, J. L. Bischoff
2002, Journal of Archaeological Science (29) 953-958
New U-Series and C14 (AMS) dates are provided for the Abric Agut (Capellades, Barcelona, Spain). This site was previously considered to be of Middle Palaeolithic age according to the characteristics of the lithic assemblage. In addition, human teeth were uncovered and attributed to neandertals. However, radiometric dating clearly indicates a...
Distribution and transport of suspended particulate matter in Monterey Canyon, California
J. P. Xu, M. Noble, S.L. Eittreim, L.K. Rosenfeld, F.B. Schwing, C.H. Pilskaln
2002, Marine Geology (181) 215-234
From August 1993 to August 1994, six moorings that measure current, temperature, salinity, and water clarity were deployed along the axis of Monterey Canyon to study the circulation and transport of water and suspended particulate matter through the canyon system. The moorings occupied three sites that are morphologically different: a...
A Brownian model for recurrent earthquakes
M.V. Matthews, W.L. Ellsworth, P.A. Reasenberg
2002, Bulletin of the Seismological Society of America (92) 2233-2250
We construct a probability model for rupture times on a recurrent earthquake source. Adding Brownian perturbations to steady tectonic loading produces a stochastic load-state process. Rupture is assumed to occur when this process reaches a critical-failure threshold. An earthquake relaxes the load state to a characteristic ground level and begins...
U-Pb geochronology of zircon and polygenetic titanite from the Glastonbury Complex, Connecticut, USA: An integrated SEM, EMPA, TIMS, and SHRIMP study
J. N. Aleinikoff, R. P. Wintsch, C.M. Fanning, M. J. Dorais
2002, Chemical Geology (188) 125-147
U-Pb ages for zircon and titanite from a granodioritic gneiss in the Glastonbury Complex, Connecticut, have been determined using both isotope dilution thermal ionization mass spectrometry (TIMS) and the sensitive high resolution ion microprobe (SHRIMP). Zircons occur in three morphologic populations: (1) equant to stubby, multifaceted, colorless, (2) prismatic, dark...
Allocation of extracellular enzymatic activity in relation to litter composition, N deposition, and mass loss
R. L. Sinsabaugh, M.M. Carreiro, D.A. Repert
2002, Biogeochemistry (60) 1-24
Decomposition of plant material is a complex process that requires interaction among a diversity of microorganisms whose presence and activity is subject to regulation by a wide range of environmental factors. Analysis of extracellular enzyme activity (EEA) provides a way to relate the functional organization of microdecomposer communities to environmental...
Subsurface geometry and evolution of the Seattle fault zone and the Seattle Basin, Washington
Uri S. ten Brink, P.C. Molzer, M. A. Fisher, R.J. Blakely, R.C. Bucknam, T. Parsons, R. S. Crosson, K. C. Creager
2002, Bulletin of the Seismological Society of America (92) 1737-1753
The Seattle fault, a large, seismically active, east-west-striking fault zone under Seattle, is the best-studied fault within the tectonically active Puget Lowland in western Washington, yet its subsurface geometry and evolution are not well constrained. We combine several analysis and modeling approaches to study the fault geometry and evolution, including...
Parasite (Ribeiroia ondatrae) infection linked to amphibian malformations in the western United States
P.T.J. Johnson, K.B. Lunde, E.M. Thurman, E.G. Ritchie, S.N. Wray, D.R. Sutherland, J.M. Kapfer, T.J. Frest, J. Bowerman, A.R. Blaustein
2002, Ecological Monographs (72) 151-168
Parasites and pathogens can influence the survivorship, behavior, and very structure of their host species. For example, experimental studies have shown that trematode parasites can cause high frequencies of severe limb malformations in amphibians. In a broad-scale field survey covering parts of California, Oregon, Washington, Idaho, and Montana, we examined...
Geology, distribution, and classification of gold deposits in the western Qinling belt, central China
J. Mao, Yumin Qiu, R.J. Goldfarb, Z. Zhang, S. Garwin, R. Fengshou
2002, Mineralium Deposita (37) 352-377
Gold deposits of the western Qinling belt occur within the western part of the Qinling-Dabie-Sulu orogen, which is located between the Precambrian North China and Yangtze cratons and east of the Songpan-Ganzi basin. The early Paleozoic to early Mesozoic orogen can be divided into northern, central, and southern zones, separated...
Deep arid system hydrodynamics 2. Application to paleohydrologic reconstruction using vadose zone profiles from the northern Mojave Desert
Michelle Ann Walvoord, Fred M. Phillips, Scott W. Tyler, Peter C. Hartsough
2002, Water Resources Research (38) 27-1-27-12
Site‐specific numerical modeling of four sites in two arid alluvial basins within the Nevada Test Site employs a conceptual model of deep arid system hydrodynamics that includes vapor transport, the role of xeric vegetation, and long‐term surface boundary transients. Surface boundary sequences, spanning 110 kyr, that best reproduce measured chloride...
Paleozoic–early Mesozoic gold deposits of the Xinjiang Autonomous Region, northwestern China
Zongyao Rui, Richard J. Goldfarb, Yumin Qiu, T. Zhou, R. Chen, Franco Pirajno, Grace Yun
2002, Mineralium Deposita (37) 393-418
The late Paleozoic–early Mesozoic tectonic evolution of Xinjiang Autonomous Region, northwestern China provided a favorable geological setting for the formation of lode gold deposits along the sutures between a number of the major Eastern Asia cratonic blocks. These sutures are now represented by the Altay Shan, Tian Shan, and Kunlun...
Web-based distribution of geo-scientific models
S.L. Markstrom, G. McCabe, O. David
2002, Computers & Geosciences (28) 577-581
[No abstract available]...
Increased oxidative stress and decreased activities of Ca2+/Mg2+-ATPase and Na+/K+-ATPase in the red blood cells of the hibernating black bear
V.P.S. Chauhan, J.A. Tsiouris, A. Chauhan, A.M. Sheikh, W. Ted Brown, M. Vaughan
2002, Life Sciences (71) 153-161
During hibernation, animals undergo metabolic changes that result in reduced utilization of glucose and oxygen. Fat is known to be the preferential source of energy for hibernating animals. Malonyldialdehyde (MDA) is an end product of fatty acid oxidation, and is generally used as an index of lipid peroxidation. We report...
Oxygen isotope corrections for online δ34S analysis
B. Fry, S. R. Silva, C. Kendall, R.K. Anderson
2002, Rapid Communications in Mass Spectrometry (16) 854-858
Elemental analyzers have been successfully coupled to stable-isotope-ratio mass spectrometers for online measurements of the δ34S isotopic composition of plants, animals and soils. We found that the online technology for automated δ34S isotopic determinations did not yield reproducible oxygen isotopic compositions in the SO2 produced, and as a result calculated...
Uranium-series disequilibrium in tuffs from Yucca Mountain, Nevada, as evidence of pore-fluid flow over the last million years
M. Gascoyne, N.H. Miller, L.A. Neymark
2002, Applied Geochemistry (17) 781-792
Samples of tuff from boreholes drilled into fault zones in the Exploratory Studies Facility (ESF) and relatively unfractured rock of the Cross Drift tunnels, at Yucca Mountain, Nevada, have been analysed by U-series methods. This work is part of a project to verify the finding of fast flow-paths through the...
Geochemistry of rock units at the potential repository level, Yucca Mountain, Nevada
Z. E. Peterman, P.L. Cloke
2002, Applied Geochemistry (17) 683-698
The compositional variability of the phenocryst-poor member of the 12.8 Ma Topopah Spring Tuff at the potential repository level was assessed by duplicate analysis of 20 core samples from the cross drift at Yucca Mountain, Nevada. Previous analyses of outcrop and core samples of the Topopah Spring Tuff showed that...
Complex earthquake rupture and local tsunamis
Eric L Geist
2002, Journal of Geophysical Research B: Solid Earth (107) ESE 2-1-ESE 2-15
In contrast to far-field tsunami amplitudes that are fairly well predicted by the seismic moment of subduction zone earthquakes, there exists significant variation in the scaling of local tsunami amplitude with respect to seismic moment. From a global catalog of tsunami runup observations this variability is greatest for the most...
Differences in attenuation among the stable continental regions
W. H. Bakun, Art McGarr
2002, Geophysical Research Letters (29) 36-1-36-4
There are systematic differences in the attenuation of damaging earthquake ground motions between different stable continental regions (SCRs). Seismic intensity and weak-motion data show that the attenuation in seismic waves for eastern North America (ENA) is less than for India, Africa, Australia, and northwest Europe. If ENA ground-motion attenuation relations...
Regional controls on geomorphology, hydrology, and ecosystem integrity in the Orinoco Delta, Venezuela
A.G. Warne, R.H. Meade, W.A. White, E.H. Guevara, J. Gibeaut, R.C. Smyth, A. Aslan, T. Tremblay
2002, Geomorphology (44) 273-307
Interacting river discharge, tidal oscillation, and tropical rainfall across the 22,000 km2 Orinoco delta plain support diverse fresh and brackish water ecosystems. To develop environmental baseline information for this largely unpopulated region, we evaluate major coastal plain, shallow marine, and river systems of northeastern South America, which serves to identify...
The geohydrologic setting of Yucca Mountain, Nevada
J. S. Stuckless, W. W. Dudley
2002, Applied Geochemistry (17) 659-682
This paper provides a geologic and hydrologic framework of the Yucca Mountain region for the geochemical papers in this volume. The regional geologic units, which range in age from late Precambrian through Holocene, are briefly described. Yucca Mountain is composed of dominantly pyroclastic units that range in age from 11.4...
Shallow seismic imaging of folds above the Puente Hills blind-thrust fault, Los Angeles, California
Thomas L. Pratt, John H. Shaw, James F. Dolan, Shari A. Christofferson, Robert Williams, Jack K. Odum, Andreas Plesch
2002, Geophysical Research Letters (29) 18-1-18-4
High-resolution seismic reflection profiles image discrete folds in the shallow subsurface (<600 m) above two segments of the Puente Hills blind-thrust fault system, Los Angeles basin, California. The profiles demonstrate late Quaternary activity at the fault tip, precisely locate the axial surfaces of folds within the upper 100 m, and...
