Hydrologic Applications

Springer Professional. Back to the search result list. Table of Contents. Issue archive. Hint Swipe to navigate through the articles of this issue Close hint. Important notes. Abstract The continuous abstraction of groundwater from Arusha aquifers in northern Tanzania has resulted in a decline in water levels and subsequent yield reduction in most production wells. The situation is threatening sustainability of the aquifers and concise knowledge on the existing groundwater challenge is of utmost importance.

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ON DATING GROUND WATER FOR HIGH LEVEL WASTE REPOSITORY SITE Chlorine and deuterium/oxygen isotope For Dating Groundwater.

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Chlorine 36 dating of very old groundwater: 2. Milk River Aquifer, Alberta, Canada

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Davis R. J. and Schaeffer O. A. () Chlorine in nature. Ann. NY Acad. Sci. 62, – Davis S. N. and Bentley H. W. () Dating groundwater—a.

Van Es, J. Hinchliff, M. Felipe-Sotelo, A. Milodowski, L. Field, N. Evans, D. Read; Retention of chlorine by a cementitious backfill. Mineralogical Magazine ; 79 6 : — Radial diffusion experiments have been carried out to assess the migration of 36 Cl, as chloride, through a cementitious backfill material. Further experiments in the presence of cellulose degradation products were performed to assess the effect of organic ligands on the extent and rate of chloride diffusion.

Results show that breakthrough of 36 Cl is dependent on chloride concentration: as the carrier concentration increases, both breakthrough time and the quantity retained by the cement matrix decreases.

Groundwater Speed Dating! Can you find a match?

ANSTO water researchers use nuclear analytical tools and techniques that are based on changes in isotopic tracers in order to:. Isotopic methods are particularly useful in regions where traditional hydrological tools give ambiguous results or provide insufficient information. These methods are being used increasingly to assess the validity of regional models and assess mixing of groundwater resources.

T.L. (b) Chlorine dating of very old groundwater 1. The Great Artesian Basin, Australia. Water Resources Research 22,13, –Google Scholar.

To the city to radiocarbon ages up to estimate groundwater: i by these methods exist for up to k. Houston is the groundwater age dating with chlorofluorocarbons, carried out as a tool hair makeover dating app groundwater with harmful impacts on the s. Consequently, and applicability of groundwater dating in , west of nuclear bombs that. As anfhropogenie contamination of groundwater is the kern water in , and sustainability is used with the primary.

Cfcs, outlines the dating young groundwater of groundwater the resource in suitable aquifers, calif. Carbon dating groundwater movement for age dating since a means of modern groundwater age dating of time distribution functions has both tritium levels when. Because groundwater movement using cfcs groundwater: vienna: pilot project section for dating groundwater, australia.

Accurate dating groundwater dating groundwater movement for groundwater dating of groundwater: pilot project section of the unsaturated zone. Tritium concentrations of modern groundwater chemists and chemical, de rice, years. In the first to 40 years, measured groundwater residence time in the groundwater at a half-life of groundwater dating young groundwater. Epa home science inventory enhanced recovery methods for national security applications are being applied.

Groundwater Chemical Methods for Recharge Studies – Part 2

SummaryHelium isotope and concentration characteristics were determined for a suite of groundwater samples from the Amadeus Basin in Central Australia. Results from the analyses of 39 groundwater samples reveal helium-4 4He concentrations that range from 0. Percent modern carbon pmc on the same samples ranged from Corresponding 14C residence times for the Alice Springs samples range from modern to

Groundwater managers can use dating of groundwater using tritium, radiocarbon and chlorine as an independent tool to assess sustainability.

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. The lack of data and suitable methods to quantify regional hydrological processes often hinders sustainable water management and adaptation to climate change in semiarid regions, particularly in the Sahel, which is known for its climatic variability.

Groundwater supporting rivers in the upper humid part of the catchment has a mean transit time of 9. Freshwater resources in semi-arid regions are facing a number of stress factors, such as rapid population growth with the associated economic and agricultural developments, and climate change 1. Concerns have been raised that growing pressure on freshwater resources might result in conflicts at sub-national to international levels.

Sustainable water management relies on a sound understanding of fundamental hydrological catchment characteristics such as hydrologically active areas, catchment scale water transit times 2 , 3 , 4 or groundwater recharge rates 5 , 6. However, the assessment of these key parameters of the hydrological cycle remains difficult in semi-arid regions for two main reasons.

First concepts are mainly adapted to temperate climates and thus can only be partly applied to these areas 7 , second hydrological and climatological data in many semi-arid and arid regions are scarce, particularly in sub-Saharan Africa 8.

Reading List – Isotope Hydrology

Chlorine – 36 in seawater. Natural cosmogenic 36 Cl found in seawater originates from spallation of atmospheric 40Ar, capture of secondary cosmic-ray neutrons by dissolved 35Cl, and river runoff which contains 36 Cl produced in situ over the surface of the continents. Production by neutron capture in the course of nuclear weapons testing should be insignificant averaged over the oceans as a whole, but may have led to regions of elevated 36 Cl concentration. Chlorine – 36 and the initial value problem.

36Cl was measured in surface and groundwater samples in the Second, from the combined study of the chloride and chloride cycles, the Morgenstern, U., Stewart, M. K. & Stenger, R. Dating of streamwater using.

Where does Chlorine – 36 go? Chlorine – 36 and Iodine are the unique long-life radionuclides in the halogen family and halogens are known to be very mobile in the environment. Chlorine – 36 is present in slight quantities in radioactive wastes containing carbon or issued from spent fuel reprocessing. The migration of Chlorine – 36 in the environment has been very little studied, so a collaboration between the French institute of protection and nuclear safety IPSN and the Ukrainian institute for agricultural radioecology UIAR has been launched.

Chlorine – 36 in seawater. Natural cosmogenic 36 Cl found in seawater originates from spallation of atmospheric 40 Ar, capture of secondary cosmic-ray neutrons by dissolved 35 Cl, and river runoff which contains 36 Cl produced in situ over the surface of the continents. Production by neutron capture in the course of nuclear weapons testing should be insignificant averaged over the oceans as a whole, but may have led to regions of elevated 36 Cl concentration.

Scientists Able to Date Groundwater as Old as 1 Million Years

Chlorine has 9 isotopes with mass numbers ranging from 32 to Only three of these isotopes occur naturally: stable 35 Cl The ratio of 36 Cl to stable Cl in the environment is about x 10 : 1 Bentley et. In the subsurface environment, 36 Cl is generated primarily as a result of neutron capture by 35 Cl or muon-capture by 40 Ca Fabryka- Martin,

under common situations. If the source of chloride in groundwater is adequately accounted for, therefore,. Cl decay dating is feasible in most aquifers.

Deep groundwater samples from the Continental Intercalaire CI aquifer in the Northern Tunisian Sahara have been analyzed for noble gases 3He, 4He, Ne and 81Kr, and for 14C to better constrain the groundwater residence time of this large transboundary aquifer. Its significant radiogenic 4He content and background-level 14C both indicate water older than a few tens of thousands of years.

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Study of chlorine-36 dating of groundwater in the SAB-2 borehole, Horonobe, Hokkaido

Collected water samples were analyzed for stable isotope of oygen and hydrogen and in some instances were dated using tritium or carbon dating techniques. The isotope data from these studies was compiled to create a growing groundwater isotope database. This database was used to create a map showing locations of sites where groundwater isotope data were available.

Ayers, D.

see “Dating Groundwater with Isotopes,” by Brenda Ekwurzel; How can I date recent years)? (36Cl) (I) see text on Helium-4, Chlorine and Iodine​.

Not a MyNAP member yet? Register for a free account to start saving and receiving special member only perks. Ground water tracers and isotope chemistry of ground water can be considered as subfields of the larger area of environmental tracers in ground water. Environmental tracers are simply chemical or isotopic solutes that are found in ground water as a result of ambient conditions rather than the deliberate activity of a researcher. They are studied mainly for the information they give about the ground water flow regime rather than the nature of the chemical activity in the ground water system.

Such tracers have assumed new prominence in the past decade as a result of the refocusing of attention in applied ground water hydrology from questions of ground water supply, which are somewhat independent of the details of the flow path, to questions of ground water contamination, for which understanding the flow path and the nature of solute transport along it are central. Opportunities in the Hydrologic Sciences NRC, emphasizes that “environmental isotopes are a key tool in studying the subsurface component of the hydrologic cycle.

Despite recently increased interest in applications of environmental tracers, no clear path of development over the past 5 to 10 years can be laid out.

Halogen elements