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5.15 Groundwater Dating and Residence-time Measurements

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3 H, 3 H⁄ 3 He, CFCs, and SF 6 have been generally used as age dating tracers for young groundwater in the U environmental tracers for age-dating young ground water.S. and Europe. Each tracer has its own advantages and disadvantages so that multi tracers method is the most reliable approach in estimating groundwater age.Environmental tracers for age-dating young ground water. In: Alley, W.M. (Ed.), Regional Ground-Water Quality. Library of Congress Catalog Card Number 92-36483.Environmental tracers for age dating young ground water: Year Published: 1993: Language: English: Publisher: Van Nostrand Reinhold: Publisher location: New York: Contributing office(s) National Research Program - Eastern Branch, Toxic Substances Hydrology Program: Description: 40 p. Larger Work Type: Book: Larger Work Title: Regional ground.[1] We tested three models of mixing between old interbasin groundwater flow (IGF) and young, locally derived groundwater in a lowland rain forest in Costa Rica using a large suite of environmental tracers. We focus on the young fraction of water using the transient tracers CFC-11, CFC-12, CFC-113, SF 6, 3 H, and bomb 14 C.CFCs are useful tracers for age dating young water. Two critical assumptions are typically invoked: (1) the initial concentration needs to be known, and (2) the tracer must be stable. A series of 800In contrast young- age dating tracers such as Tritium or anthropogenic trace gases (CFCs and SF6) were used to quantify the duration of water flow from the recharge area to the springs (Yechieli et al. 1994; Lange 2011). Environmental tracer investigations of the main Cretaceous aquifers (Upper Cenomanian and Albian) in the westernChlorofluorocarbons (CFC method) and tritium and helium isotopes (3H-3He method) were used as environmental tracers to estimate ground-water age in conjunction with efforts to develop a regional ground-water flow model of the buried-valley aquifer in the Dayton area, southwestern Ohio.These age-dating tracers can help water-resource managers to develop management strategies for shallow groundwater systems that contain mostly young groundwater. Old groundwater is defined as water that entered the aquifer before 1950 and more commonly refers to water older than 1,000 years.Lakeshore Environmental, Inc. (LEI) was awarded a research grant from the National Ground Water Research and Educational Foundation to conduct an assessment of groundwater age and rate of recharge using environmental tracers. Environmental tracers for age-dating young ground water.

Groundwater age-dating simplified - USGS

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  7. Dating of Young Groundwater | SpringerLink
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Groundwater age dating with chlorofluorocarbons - Oster

Dating method for young groundwater using environmental tracers −Application of CFCs dating method to spring in volcanic areas J. Jpn. Assoc. Hydrol. Sci. , 39 ( 2009 ) , pp environmental tracers for age-dating young ground water. 67 - 78 , 10.4145/jahs.39.67Use of Chlorofluorocarbons (CCl 3 F and CCl 2 F 2) as hydrologic tracers and age-dating tools: The alluvium and terrace system of central Oklahoma. Water Resour. Res., 28: 2257-2283. • Busenberg, E. and Plummer, L.N. (1993). Use of trichlorofluorocarbon-113 (CFC-113) as a hydrologic tracer and age-dating tool of young ground water.Plummer LN, Michel RL, Thurman EM, Glynn PD (1993) Environmental tracers for age-dating young ground water. In: Regional ground-water quality, Reinhold, New York, pp 255–294 Pollock DW (1994) User’s guide for MODPATH/MODPATH-PLOT, version 3: a particle post-processing package for MODFLOW, the U.S. Geological Survey finite-difference ground.A new USGS report documents a simple method to classify groundwater age as premodern (recharged before 1953), modern (recharge in 1953 or later), or a mix of the two. The method—tritium-based age classification, or TBAC—requires just a single measurement of tritium, along with knowledge of sample date and location.CFCs are useful tracers for age dating young water. Two critical assumptions are typically invoked: (1) the initial concentration needs to be known, and (2) the tracer must be stable. A series of 800Coplen, T.B., 1993, Uses of environmental. and hydrologic tracers in shallow ground water of. tracers for age-dating young groundwater.Eganhouse, R.P., and Pontolillo, J., 2003, Reply to commentary on "Assessing the reliability of physico-chemical property data (Kow, Sw) for hydrophobic organic compounds--DDT and DDE as a case study: SETAC Globe (Learned Discourses), January-February.•tracers are relatively expensive •but one-time sampling can sometimes be used to characterize aquifer (rather than long-term monitoring) •tracers average over regional/aquifer spatial scale, but also average out some temporal variability GW age-dating tracer approachMass transfer between aquifer solids and ground water occurs, resulting in a relationship between ground-water travel time (or contact time) and the 4 He concentration in ground water. If the 4 He solid-to-liquid mass transfer rate is known, it is possible to use 4 He as a quantitative tracer of ground-water travel times (e.g. Marine, 1979. Environmental tracers for age-dating young ground water.

(PDF) Environmental tracers for age dating young ground water

3 H/ 3 He Dating Background. Tritium ( 3 H, half-life of 12.43 years (Unterweger and others, 1980)) has provided an excellent tracer of young waters. Tritium input to ground water has occurred in a series of spikes following periods of atmospheric testing of nuclear devices that began in 1952 and reached a maximum in 1963-1964.Chlorofluorocarbons (CFC method) and tritium and helium isotopes (3H-3He method) were used as environmental tracers to estimate ground-water age in conjunction with efforts to develop a regional ground-water flow model of the buried-valley aquifer in the Dayton area, southwestern Ohio.Use of Chlorofluorocarbons (CCl 3 F and CCl 2 F 2) as hydrologic tracers and age-dating tools: The alluvium and terrace system of central Oklahoma. Water Resour. Res., 28: 2257-2283. • Busenberg, E. and Plummer, L.N. (1993). Use of trichlorofluorocarbon-113 (CFC-113) as a hydrologic tracer and age-dating tool of young ground water.Papers with reference to environmental tracers and ground water age from USGS ground water dating group. USGS Publication Warehouse. Plummer, L.N., Busby, J.F., Lee.Coplen, T.B., 1993, Uses of environmental. and hydrologic tracers in shallow ground water of. tracers for age-dating young groundwater.Testing mixing models of old and young groundwater in a tropical lowland rain forest with environmental tracers: TESTING MIXING MODELS WITH ENVIRONMENTAL TRACERS journal, April 2010. Solomon, D. Kip; Genereux, David P.; Plummer, L. Niel; Water Resources Research, Vol. 46, Issue 4; DOI: 10.1029/2009WR008341U.S. Environmental Protection Agency Modeling Project Subcommittee (Science Advisory Board), 1993, Review of the assessment framework for ground-water model applications: Environmental Protection Agency, 12 p.Abstract We describe field observations and numerical simulations of the environmental tracers 3 H, 85 Kr, CFC-113 (C 2 Cl 3 F 3 ), SF 6 and Ne in groundwater. The field site is a well-characterised shallow aquifer in central Germany, consisting of basalts of Miocene age, overlain by up to 15 m of loess deposits. A two-dimensional numerical model was used to simulate tracer transport at the.This document is also available in pdf format: fs-134-99.pdf Tracing and Dating Young Ground Water. Data on concentrations of environmental tracers, such as chlorofluorocarbons (CFCs), tritium (3 H), and other chemical and isotopic substances in ground water, can be used to trace the flow of young water (water recharged within the past 50 years) and to determine the time elapsed since recharge. Environmental tracers for age-dating young ground water.

(PDF) Environmental tracers for age dating young ground water

In contrast young- age dating tracers such as Tritium or anthropogenic trace gases (CFCs and SF6) were used to quantify the duration of water flow from the recharge area to the springs (Yechieli et al. 1994; Lange 2011). Environmental tracer investigations of the main Cretaceous aquifers (Upper Cenomanian and Albian) in the westernEnvironmental Protection Agency (USEPA) established provisional action levels in 1999 of 4-18. Environmental tracers for age-dating young ground water. In Regional.Using Environmental Tracers in Modeling Flow in a Complex Shallow Aquifer System By Klaus Hinsby , Lars Troldborg , J. Refsgaard , and Peter Engesgaard Factors controlling terrigenic SF6 in young groundwater of the Odenwald region (GermanySolomon, D. K., Genereux, D. P., Plummer, L. N., and Busenbeg, E., Testing Mixing Models of Old and Young Groundwater in a Tropical Lowland Rainforest with environmental tracers for age-dating young ground water.Mazor, E., and A. Bosch, 1992, Helium as a semi-quantitative tool for groundwater dating in the range of 10 4 –10 8 years, in, Isotopes of Noble Gases as Tracers in Environmental Studies, International Atomic Energy Association (IAEA), Vienna, pages 163-178.•tracers are relatively expensive •but one-time sampling can sometimes be used to characterize aquifer (rather than long-term monitoring) •tracers average over regional/aquifer spatial scale, but also average out some temporal variability GW age-dating tracer approachTesting mixing models of old and young groundwater in a tropical lowland rain forest with environmental tracers: TESTING MIXING MODELS WITH ENVIRONMENTAL TRACERS journal, April 2010. Solomon, D. Kip; Genereux, David P.; Plummer, L. Niel; Water Resources Research, Vol. 46, Issue 4; DOI: 10.1029/2009WR008341The Reston Groundwater Dating Laboratory. Tritium 3 H, half-life of. Tritium input to ground water has occurred in a series of spikes following periods of atmospheric testing of nuclear devices that began in and reached a maximum in. Concentrations of 3 H in precipitation using decreased tritium the mids bomb peak, except for some small increases laboratory French and Chinese tests tritium the.3 H, 3 H⁄ 3 He, CFCs, and SF 6 have been generally used as age dating tracers for young groundwater in the U environmental tracers for age-dating young ground water.S. and Europe. Each tracer has its own advantages and disadvantages so that multi tracers method is the most reliable approach in estimating groundwater age. Environmental tracers for age-dating young ground water.

(PDF) 36Cl in modern groundwater dated by a multi-tracer

[1] We tested three models of mixing between old interbasin groundwater flow (IGF) and young, locally derived groundwater in a lowland rain forest in Costa Rica using a large suite of environmental tracers. We focus on the young fraction of water using the transient tracers CFC-11, CFC-12, CFC-113, SF 6, 3 H, and bomb 14 C.Tritium/helium-3 (3H/3He) and chlorofluorocarbons (CFCs) were investigated as environmental tracers in ground water from Jeju Island (Republic of Korea), a basaltic volcanic island. Ground-water mixing was evaluated by comparing 3H and CFC-12Dating method for young groundwater using environmental tracers −Application of CFCs dating method to spring in volcanic areas J. Jpn. Assoc. Hydrol. Sci. , 39 ( 2009 ) , pp environmental tracers for age-dating young ground water. 67 - 78 , 10.4145/jahs.39.67Abstract. Besides other environmental tracers, the use of the 3 H-3 He method enables the estimation of modern groundwater ages. Widely used in fresh groundwater studies, the combination of tritium (3 H) and its stable daughter product tritiogenic helium-3 (3 He trit), however, has so far only been applied in a few studies to date groundwater in coastal aquifers.Testing mixing models of old and young groundwater in a tropical lowland rain forest with environmental tracers: TESTING MIXING MODELS WITH ENVIRONMENTAL TRACERS journal, April 2010. Solomon, D. Kip; Genereux, David P.; Plummer, L. Niel; Water Resources Research, Vol. 46, Issue 4; DOI: 10.1029/2009WR008341The apparent age of ground water is considered to be the amount of time determined from an age-dating tracer that has elapsed since the water was last in contact with the atmosphere. Modern ground water generally is more susceptible to contamination than old ground water because of the many man-made contaminants introduced during the 20th. Environmental tracers for age-dating young ground water.

Groundwater Age Dating Using Tritium - The Reston Groundwater