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Hydrology
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Advances in Isotope Investigations of Groundwater Resources
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Advances in Isotope Investigations of Groundwater Resources

A special issue of Hydrology (ISSN 2306-5338). This special issue belongs to the section "Surface Waters and Groundwaters".

Deadline for manuscript submissions: 30 April 2024 | Viewed by 5913

Special Issue Editor

Dr. Mahmoud Sherif

E-Mail Website
Guest Editor
1. National High Magnetic Field Laboratory, 1800 E Paul Dirac Dr, B302, Tallahassee, FL 32310, USA
2. National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32306, USA
Interests: isotope hydrology; hydrogeology; radium; isotopic tracers; groundwater
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

I am pleased to invite you to contribute to the special issue on "Advances in Isotope Investigations of Groundwater Resources" for Hydrology. Dr. Mahmoud Sherif (Tanta university, Egypt) will serve as a guest editor for this issue.

Global freshwater stock accounts for approximately 35 million cubic kilometers, distributed over a wide range of forms and locations. However, several parts around the world experience water scarcity owing to the regional and temporal imbalances in water supply and demand. Estimates indicated that almost 500 million people live in countries that experience severe water stress. Groundwater provides around 24.5% of the world’s freshwater supply. It’s considered the only source of freshwater in many countries where surface water is not reachable. Exploitation of groundwater is expected to increase in the near future to accommodate increased demand and developmental goals of countries. However, understanding complexities of aquifer systems remain crucial in order to better manage groundwater resources. Isotopes (stable and radiogenic) have proven as useful tracers to decipher hydrological and hydrogeological processes of aquifer systems.

In this special issue, we seek both research and review papers on the recent advances of isotopes to address one or more of the following topics:

  • Groundwater recharge and movement of water
  • Sources and origin of groundwaters
  • Sources of pollutants and their transport dynamics
  • Water salinization in coastal aquifers
  • Residence times of groundwater
  • Assessment and management groundwater resources in aquifer systems

Dr. Mahmoud Sherif
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Hydrology is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • groundwater
  • aquifers
  • hydrogeology
  • isotopes
  • tracers
  • groundwater age
  • groundwater management

Published Papers (3 papers)

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Research

25 pages, 9095 KiB  
Article
Boron Isotopes in Fresh Surface Waters in a Temperate Coastal Setting
by Brooke N. Peritore, E. Troy Rasbury, Kathleen M. Wooton, Carrie C. Wright, Deanna M. Downs, Anastasia Iorga and Shannon L. Letscher
Hydrology 2023, 10(9), 186; https://doi.org/10.3390/hydrology10090186 - 14 Sep 2023
Viewed by 1271
Abstract
The results from a four-year study of a freshwater pond on Long Island, NY, USA, do not point to a single source of boron (and by proxy other elements including nutrients) in this system. However, boron data from samples associated with this pond [...] Read more.
The results from a four-year study of a freshwater pond on Long Island, NY, USA, do not point to a single source of boron (and by proxy other elements including nutrients) in this system. However, boron data from samples associated with this pond can be explained by mixing between average precipitation (weighted average δ11B = 22.7) in the area and the local sources of boron, both natural and anthropogenic. This multiyear study provided the opportunity to see both yearly and seasonal differences. One algae sample from the pond showed significant fractionation and enrichment in light boron relative to the water and suggests algae may act as a boron sink. This type of biological fractionation could explain an observed down-gradient trend to heavier boron isotope values in pond water, which corresponds to the slight reduction in boron concentration seen in 2021. However, the trend was subdued in the following year, likely due to differences in the water flow rates and/or rate of algal growth. An opposite trend was seen with depth in the water, where δ11B showed a positive correlation to boron concentration, which increased with depth from the surface of the pond. This gradient may be explained by the stratification of the pond with a heavy source concentrating in the bottom waters. The bottom water composition was consistent with goose feces (δ11B = 25.8) or the addition of chemicals from the application of rock salt to local roads in winter. Surprisingly, boron from seawater (average δ11B = 39.8) did not appear to have a direct impact on Setauket Pond, other than its influence on precipitation, providing heavy δ11B and very low boron concentrations. Full article
(This article belongs to the Special Issue Advances in Isotope Investigations of Groundwater Resources)
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24 pages, 7357 KiB  
Article
Stable Isotopic Evaluation of Recharge into a Karst Aquifer in a Glaciated Agricultural Region of Northeastern Wisconsin, USA
by John A. Luczaj, Amber Konrad, Mark Norfleet and Andrew Schauer
Hydrology 2023, 10(6), 133; https://doi.org/10.3390/hydrology10060133 - 17 Jun 2023
Viewed by 1982
Abstract
Ground water contamination from septic systems and the application of dairy cattle manure has been a long-standing problem in rural northeastern Wisconsin, especially in areas with thin soils over karstified Silurian dolostone bedrock, where as many as 60% of the wells show evidence [...] Read more.
Ground water contamination from septic systems and the application of dairy cattle manure has been a long-standing problem in rural northeastern Wisconsin, especially in areas with thin soils over karstified Silurian dolostone bedrock, where as many as 60% of the wells show evidence of fecal contamination. We present the results of a citizen science supported water-isotope study in Kewaunee County, Wisconsin to evaluate aquifer recharge processes in the critical zone and to demonstrate the viability of time-series stable isotope data as a supplement to traditional water quality indicators in a contamination-prone aquifer. A meteoric water line was also constructed for Green Bay, Wisconsin, providing reasonable isotopic ranges for aquifer recharge events. Volunteer homeowners collected water samples from their domestic wells for a period of ~14 months to provide a measure of long-term isotopic variation in produced water and to determine whether event-driven responses could be identified using δ18O and δ2H isotopic values. Three shallower wells with a prior history of contamination exhibited significant seasonal variation, while the deepest well with the greatest soil thickness (above bedrock) showed less variation. For moderate precipitation events, the shallowest well showed as much as 5–13% of produced water coming from direct recharge, with smaller contributions for deeper wells. Our case study provides a clear example of how citizen science can collect useful time-series isotopic data to support groundwater recharge studies. Full article
(This article belongs to the Special Issue Advances in Isotope Investigations of Groundwater Resources)
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15 pages, 2834 KiB  
Article
The Boron Budget in Waters of the Mono Basin, California
by Mengqu Han, E. Troy Rasbury, N. Gary Hemming, Sidney R. Hemming and Paul B. Tomascak
Hydrology 2023, 10(6), 122; https://doi.org/10.3390/hydrology10060122 - 28 May 2023
Viewed by 1812
Abstract
Mono Lake in eastern California has the highest natural boron concentrations measured in a natural water body. Inputs to Mono Lake are from creeks that drain from the Sierra Nevada, accounting for over 80% of the total water input, and springs account for [...] Read more.
Mono Lake in eastern California has the highest natural boron concentrations measured in a natural water body. Inputs to Mono Lake are from creeks that drain from the Sierra Nevada, accounting for over 80% of the total water input, and springs account for most of the rest of the water budget. We measured boron concentrations and isotope compositions of water sources in the lake and lake water collected over several seasons. The δ11B offset of at least +2.5‰ between Mono Lake water compared to its inputs suggests that, like seawater, the boron isotopic composition of the lake is influenced by the removal of light boron by coprecipitation and/or sorption of borate. Given the alkalinity of the lake, boron fractionation likely occurs before or as the water sources enter the lake. The famous tufa towers around the lake are a physical representation of a ‘chemical delta’ that alters the boron isotopic composition of the source fluids as they enter the lake. Based on different combinations of the measured end members, the residence time of boron in Mono Lake is estimated to be within the range of 5~80 ka. Full article
(This article belongs to the Special Issue Advances in Isotope Investigations of Groundwater Resources)
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