Citations
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A review and evaluation of catchment transit time modeling
TL;DR: In this article, the authors present an evaluation and review of the transit time literature in the context of catchments and water transit time estimation and provide a critical analysis of unresolved issues when applied at the catchment-scale.
Journal ArticleDOI
Groundwater recharge and agricultural contamination
TL;DR: For reactive con- taminants like NO 3 -, a combination of chemical, isoto- pic, and environmental-tracer analytical approaches might be required to resolve changing inputs from subse- quent alterations as causes of concentration gradients in groundwater Groundwater records derived from multi- component hydrostratigraphic data can be used to quan- tify recharge rates and residence times of water and dis- solved contaminants, document past variations in recharging contaminant loads, and identify natural contam- inant-remediation processes.
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Combined Use of Groundwater Dating, Chemical, and Isotopic Analyses to Resolve the History and Fate of Nitrate Contamination in Two Agricultural Watersheds, Atlantic Coastal Plain, Maryland
TL;DR: The history and fate of groundwater nitrate contamination were compared in 2 small adjacent agricultural watersheds in the Atlantic coastal plain by combined use of chronologic (CCl2F2, 3H), chemical (dissolved solids, gases), and isotopic (δ15N,δ13C, δ34S) analyses of recharging groundwater, discharging groundwaters, and surface waters as discussed by the authors.
Journal ArticleDOI
Noble Gases in Lakes and Ground Waters
TL;DR: In contrast to most other fields of noble gas geochemistry that mostly regard atmospheric noble gases as contamination, the authors pointed out that air-derived noble gases make up the far largest and hence most important contribution to the noble gas abundance in meteoric waters, such as lakes and ground waters.
Journal ArticleDOI
Direct Simulation of Groundwater Age
TL;DR: In this paper, a new method is proposed to simulate groundwater age directly, by use of an advection-dispersion transport equation with a distributed zero-order source of unit strength, corresponding to the rate of aging.
References
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Journal ArticleDOI
Characterizing aquatic dissolved organic matter.
Minze Stuiver,Henry Polach +1 more
TL;DR: In this article, standards for reporting C-14 age determinations are discussed, and the statistical uncertainty (plus or minus one standard deviation) expresses counting errors, inaccuracies in voltage, pressure, temperature, dilution, and should include errors in C-13 ratios.
Journal ArticleDOI
Dispersion of soluble matter in solvent flowing slowly through a tube
TL;DR: In this paper, it was shown analytically that the distribution of concentration produced in this way is centred on a point which moves with the mean speed of flow and is symmetrical about it in spite of the asymmetry of the flow.
Journal ArticleDOI
The Dispersion of Matter in Turbulent Flow through a Pipe
TL;DR: In this paper, the dispersion of soluble matter introduced into a slow stream of solvent in a capillary tube can be described by means of a virtual coefficient of diffusion (Taylor 1953a), which represents the combined action of variation of velocity over the cross-section of the tube and molecluar diffusion in a radial direction.
Journal ArticleDOI
Dead-End Pore Volume and Dispersion in Porous Media
Keith H. Coats,B.D. Smith +1 more
Journal ArticleDOI
Diffusion in the rock matrix: An important factor in radionuclide retardation?
TL;DR: In this paper, the authors analyzed the accessibility of the rock matrix to radio-nuclides and showed that the diffusion of the nuclides into the rock matrices and their sorption onto the surfaces of the microfissures are the main mechanisms retarding migration from a repository.