Recent seawater intrusion into deep aquifer determined by the radioactive noble-gas isotopes 81Kr and 39Ar

Yechieli, Yoseph; Yokochi, Reika; Zilberbrand, Michael; Lu, Zheng‐Tian; Purtschert, Roland; Sueltenfuss, Jürgen; Jiang, Wei; Zappala, J. C.; Mueller, Peter; Bernier, Ryan; Avrahamov, Naama; Adar, Eilon; Talhami, Firas; Livshitz, Yakov; Burg, Avihu

doi:10.1016/j.epsl.2018.11.028

Cited by 36 publications

(15 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The most recent development in this field is the introduction of an analytical method from atomic physics (Atom Trap Trace Analysis), which greatly facilitates the use of the noble gas radioisotopes 39 Ar, 81 Kr, and 85 Kr (Lu et al, 2014). This new method of groundwater dating is now increasingly being applied, making successful use of the advantageous properties of the noble gas radioisotopes (e.g., Aggarwal et al, 2015;Gerber et al, 2017;Matsumoto et al, 2018;Ritterbusch et al, 2014;Yechieli et al, 2019).…”

Section: Dating Tracersmentioning

confidence: 99%

The Demographics of Water: A Review of Water Ages in the Critical Zone

Sprenger

Stumpp

Weiler

et al. 2019

Reviews of Geophysics

239

214

View full text Add to dashboard Cite

The time that water takes to travel through the terrestrial hydrological cycle and the critical zone is of great interest in Earth system sciences with broad implications for water quality and quantity. Most water age studies to date have focused on individual compartments (or subdisciplines) of the hydrological cycle such as the unsaturated or saturated zone, vegetation, atmosphere, or rivers. However, recent studies have shown that processes at the interfaces between the hydrological compartments (e.g., soil‐atmosphere or soil‐groundwater) govern the age distribution of the water fluxes between these compartments and thus can greatly affect water travel times. The broad variation from complete to nearly absent mixing of water at these interfaces affects the water ages in the compartments. This is especially the case for the highly heterogeneous critical zone between the top of the vegetation and the bottom of the groundwater storage. Here, we review a wide variety of studies about water ages in the critical zone and provide (1) an overview of new prospects and challenges in the use of hydrological tracers to study water ages, (2) a discussion of the limiting assumptions linked to our lack of process understanding and methodological transfer of water age estimations to individual disciplines or compartments, and (3) a vision for how to improve future interdisciplinary efforts to better understand the feedbacks between the atmosphere, vegetation, soil, groundwater, and surface water that control water ages in the critical zone.

show abstract

Section: Dating Tracersmentioning

confidence: 99%

The Demographics of Water: A Review of Water Ages in the Critical Zone

Sprenger

Stumpp

Weiler

et al. 2019

Reviews of Geophysics

239

214

View full text Add to dashboard Cite

show abstract

“…Yet, it is anoxic with presence of H2S and has higher Mg/Ca ratio as compared to modern seawater. Recent dating using radiocarbon and 81 Kr of this water shows that it is younger than 40 Ka [1]. This water body is found in the western margins of the Yarkon-Taninim basin as well as below the freshwater (Fig.…”

Section: The Western Basinmentioning

confidence: 91%

“…3. East-west schematic geological section of the western basin showing the position of the saline and fresh water bodies (from [1]). Note the lateral lithological transition dolomitic-limestone Judea Group aquifer to the impermeable chalky marly unit to the west which restricts seawater inflow westward into the aquifer.…”

Section: The Western Basinmentioning

confidence: 99%

See 1 more Smart Citation

A highly active karstic aquifer bounded by saline waters: The Judea Group aquifer

et al. 2019

Self Cite

View full text Add to dashboard Cite

The freshwater of the Judea Group aquifer that recharges on the crest of the Judea and Samria Mountain ridge flows east and west, defining two groundwater basins. At the foothills of both basins the freshwater encounters ancient saline or brackish water. The mode of interaction between the two water bodies within each basin is different, although both eventually discharge as brackish spring system. We describe these systems and identify the source of the higher salinity end members.

show abstract

“…Many studies exist on the interface of fresh groundwater and seawater in coastal environments (Post et al, 2013a;Mahlknecht et al, 2018;Yechieli et al, 2019;Parizi et al, 2019). The majority of these studies concentrate on either seawater intrusion in coastal aquifers or submarine groundwater discharge (SGD) through the seafloor into the ocean (Stieglitz et al, 2010;Santos et al, 2009;Bryan et al, 2016;Mahmoodzadeh and Karamouz, 2019;Parizi et al, 2019).…”

mentioning

confidence: 99%

Groundwater mean residence times of a subtropical barrier sand island

Hofmann

Newborn

Cartwright

et al. 2020

Hydrol. Earth Syst. Sci.

View full text Add to dashboard Cite

Abstract. Fresh groundwater on barrier islands is affected by changing sea levels and precipitation variability due to climate change and is also vulnerable to anthropogenic processes, such as contamination and groundwater over-abstraction. Constraining groundwater mean residence times (MRTs) and flow paths is essential for understanding and managing these resources. This study uses tritium (3H) and carbon-14 (14C) to determine the MRTs of groundwater along a transect across subtropical North Stradbroke Island, south-east Queensland, Australia. Hydraulic properties, major ion geochemistry and stable isotopes are used to validate residence times and to identify the processes responsible for their variability. 3H activities range from less than 0.01 to 1 TU (tritium units), which are values lower than those of local average rainfall (1.6–2.0 TU). 14C concentrations range from 62.5 to 111 pMC (percent modern carbon). Estimated MRTs determined using lumped parameter models and 3H activities range from 37 to more than 50 years. Recharge occurs over the entire island, and groundwater MRTs generally increase vertically and laterally towards the coastal discharge areas, although no systematic pattern is observed. MRTs estimated from 14C concentrations display similar spatial relationships but have a much greater range (from modern to approximately 5000 years). Water diversion and retention by lower-permeability units in the unsaturated parts of the dune systems are the most likely course for relatively long MRTs to date. The results indicate that the internal structures within the dune systems increase MRTs in the groundwater system and potentially divert flow paths. The structures produce perched aquifer systems that are wide-spread and have a significant influence on regional recharge. The geochemical composition of groundwater remains relatively consistent throughout the island, with the only irregularities attributed to old groundwater stored within coastal peat. The outcomes of this study enhance the understanding of groundwater flow, recharge diversion and inhibition for large coastal sand masses in general, especially for older sand masses that have developed structures from pedogenesis and dune movement. With respect to south-east Queensland, it allows the existing regional groundwater flow model to be refined by incorporating independent MRTs to test models' validity. The location of this large fresh groundwater reservoir, in dry and populous south-east Queensland, means that its potential to be used as a water source is always high. Background information on aquifer distribution and groundwater MRTs is crucial to better validate impact assessment for water abstraction.

show abstract

Recent seawater intrusion into deep aquifer determined by the radioactive noble-gas isotopes 81Kr and 39Ar

Cited by 36 publications

References 37 publications

The Demographics of Water: A Review of Water Ages in the Critical Zone

The Demographics of Water: A Review of Water Ages in the Critical Zone

A highly active karstic aquifer bounded by saline waters: The Judea Group aquifer

Groundwater mean residence times of a subtropical barrier sand island

Contact Info

Product

Resources

About