Discharge and environmental isotope behaviours of adjacent fractured and porous aquifers

Deiana, Manuela; Mussi, Mario; Ronchetti, Francesco

doi:10.1007/s12665-017-6897-x

Cited by 15 publications

(9 citation statements)

References 48 publications

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“…This would allow conditions to return to background levels in the summer when little recharge occurs. This pulse of snowmelt is similar to the observations from Gleeson et al (2009) and Deiana et al (2017), however the residence time of the pulse in this case is several months compared to several weeks in those studies. The rate at which the aquifer rebounds to prior isotopic conditions, may be an indication of storage and vulnerability to extreme climate events, as this observation is more pronounced in crystalline rock where storage is very low.…”

Section: Isotope Response From Climate Conditionssupporting

confidence: 88%

“…Despite the use of multi-level or nested wells in these studies, only one sampling event was utilized, which restricts interpretation to one point in time and cannot indicate arrival or residence times of recharge. Studies that do incorporate temporal sampling of stable isotopes in bedrock groundwater are typically from springs (Deiana et al, 2017;Jódar et al, 2016;Winograd et al, 1998), domestic wells (Abbott et al, 2000;Velderman, 1994), open boreholes (Doveri and Mussi, 2014;Negrel et al, 2011) or open-hole discrete samplers (Padilla et al, 2015;Saxena, 1984). Sampling from open boreholes or springs blends the contributions from discrete fractures and inhibits the ability to identify the relative contribution of individual flow systems with depth.…”

Section: Introductionmentioning

confidence: 99%

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Groundwater recharge, flow and stable isotope attenuation in sedimentary and crystalline fractured rocks: Spatiotemporal monitoring from multi-level wells

Wright

Novakowski

2019

Journal of Hydrology

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The complexities of fractured rock systems necessitate the use of multi-level monitoring wells for the measurement of isotopic tracers with depth. These methods, however, are rarely employed in groundwater flow studies, particularly involving temporal isotope measurements in multiple rock types. To understand the use of isotopic snowmelt tracers for exploring surface connections and recharge, an investigation was undertaken at three geologically-distinct field sites in south-eastern Ontario, Canada. Results of constant head injection tests at 2-m intervals were used to identify and isolate high transmissivity zones (2-3 in each well) for the construction of eight multi-level wells (22 intervals) for groundwater sampling. Deuterium and oxygen-18 were measured in rain (n=64), snow (n=67), soil water (n=118) and groundwater (n=594) on a bi-weekly to monthly basis over two seasonal snowmelt cycles (> 1.5 years). In combination with stable isotopes, measurements of hydraulic head, groundwater temperature, specific conductance and two rounds of tritium sampling contributed to the development of a conceptual model for snowmelt recharge and flow in sandstone, limestone and crystalline rock. Seasonal variation of ẟ 2 H and ẟ 18 O was observed in all rock types indicating recent recharge and strong surface connections. The dampening and residence time of the snowmelt tracer increased with depth in crystalline rock. Attenuation was highest in higherporosity sedimentary rock and strong confining conditions were observed to inhibit recent recharge.Substantial isotopic attenuation measured in the overburden indicated that the strong snowmelt signal measured in groundwater stems from water infiltrating through areas with thin or no overburden.Identification of the periodic trends and distinct isotopic horizons in this study would not have been possible without the use of multi-level wells.

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Section: Isotope Response From Climate Conditionssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Groundwater recharge, flow and stable isotope attenuation in sedimentary and crystalline fractured rocks: Spatiotemporal monitoring from multi-level wells

Wright

Novakowski

2019

Journal of Hydrology

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“…The evaluation of the recharge areas of aquifers mainly involves the altitude effect and is based upon the following: (a) the long-term sampling of precipitations, (b) the calculation of the isotopic gradient, and (c) in a few cases, the use of little springs as natural pluviometers [22][23][24][25]. Some authors have reported isotopic altitude gradients that are valid for Italy [26] or for selected areas [2,20,25,[27][28][29][30][31][32]. A recent study indexed δ 18 O data collected by several authors along the entire Italian peninsula, thus updating a previous similar work [4,26].…”

Section: Introductionmentioning

confidence: 99%

“…In most cases, the isotopic gradients were obtained by starting from rain gauges datasets, and thus, their further comparison with groundwater did not take into account possible hydrological processes occurring at the soil surface (and the consequent isotopic changes in infiltrative water). In some cases, the isotopic gradients were obtained from springs, thus taking into account hydrological processes occurring at the soil surface, but the area involved in the abovementioned studies was relatively small (between 25 and 100 km 2 ) [22,25,32].…”

Section: Introductionmentioning

confidence: 99%

Estimating the Isotopic Altitude Gradient for Hydrogeological Studies in Mountainous Areas: Are the Low-Yield Springs Suitable? Insights from the Northern Apennines of Italy

Tazioli

Cervi²,

Doveri

et al. 2019

Water

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Several prior studies investigated the use of stable isotopes of water in hydrogeological applications, most on a local scale and often involving the isotopic gradient (evaluated by exploiting the so-called altitude effect), calculated on the basis of rainwater isotopes. A few times, this gradient has been obtained using the stable isotopic contents of low-yield springs in a limited time series. Despite the fact that this method has been recognized by the hydrogeological community, marked differences have been observed with respect to the mean stable isotopes content of groundwater and rainwater. The present investigation compares the stable isotopic signatures of 23 low-yield springs discharging along two transects from the Tyrrhenian sea to the Po Plain of Italy, evaluates the different isotopic gradients and assesses their distribution in relation to some climatic and topographic conditions. Stable isotopes of water show that groundwater in the study area is recharged by precipitation and that the precipitation regime in the eastern portion of the study area is strongly controlled by a shadow effect caused by the Alps chain on the air masses from central Europe. Stable isotopes (in particular the δ18O and deuterium excess (d-excess) contents together with the obtained isotopic gradients) allow us to identify in the study area an opposite oriented orographic effect and a different provenance of the air masses. When the windward slope is located on the Tyrrhenian side, the precipitation shows a predominant oceanic origin; when the windward slope moves to the Adriatic side, the precipitation is characterized by a continental origin. The main results of this study confirm the usefulness of low-yield springs and the need for a highly detailed survey-scale hydrological investigation in the mountainous context.

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“…Stable isotope compositions can be used to measure the biogeochemical behavior of groundwater, including determining sources and recharge [1][2][3][4][5], the evolution of water quality [6], and transitions between surface and groundwater [7,8]. Geothermal water is abundant deep underground around the city of Kaifeng, Henan Province, China, and contains a variety of minerals that are beneficial to humans [9], so it can be used for drinking, bathing, medical treatment, and health care.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Burial and Migration Characteristics of Deep Geothermal Water Using Hydrogen, Oxygen, and Inorganic Carbon Isotopes

Wang

Qiao

Chen

et al. 2017

Water

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Geothermal water samples taken from deep aquifers within the city of Kaifeng at depths between 800 and 1650 m were analyzed for conventional water chemical compositions and stable isotopes. These results were then combined with the deuterium excess parameter (d value), and the contribution ratios of different carbon sources were calculated along with distributional characteristics and data on the migration and transformation of geothermal water. These results included the conventional water chemical group, hydrogen, and oxygen isotopes (δD-δ 18 O), dissolved inorganic carbon (DIC) and associated isotopes (δ 13 C DIC ). The results of this study show that geothermal water in the city of Kaifeng is weakly alkaline, water chemistry mostly comprises a HCO 3 -Na type, and the range of variation of δD is between −76.12‰ and −70.48‰, (average: −74.25‰), while the range of variation of δ 18 O is between −11.08‰ and −9.41‰ (average: −10.15‰). Data show that values of d vary between 1.3‰ and 13.3‰ (average: 6.91‰), while DIC content is between 91.523 and 156.969 mg/L (average: 127.158 mg/L). The recorded range of δ 13 C DIC was between −10.160‰ and −6.386‰ (average: −9.019‰). The results presented in this study show that as depth increases, so do δD and δ 18 O, while d values decrease and DIC content and δ 13 C DIC gradually increase. Thus, δD, δ 18 O, d values, DIC, and δ 13 C DIC can all be used as proxies for the burial characteristics of geothermal water. Because data show that the changes in d values and DIC content are larger along the direction of geothermal water flow, so these proxies can be used to indicate migration. This study also shows demonstrates that the main source of DIC in geothermal water is CO 2 thathas a biological origin in soils, as well as the dissolution of carbonate minerals in surrounding rocks. Thus, as depth increases, the contribution of soil biogenic carbon sources to DIC decreases while the influence of carbonate dissolution on DIC increases.

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Discharge and environmental isotope behaviours of adjacent fractured and porous aquifers

Cited by 15 publications

References 48 publications

Groundwater recharge, flow and stable isotope attenuation in sedimentary and crystalline fractured rocks: Spatiotemporal monitoring from multi-level wells

Groundwater recharge, flow and stable isotope attenuation in sedimentary and crystalline fractured rocks: Spatiotemporal monitoring from multi-level wells

Estimating the Isotopic Altitude Gradient for Hydrogeological Studies in Mountainous Areas: Are the Low-Yield Springs Suitable? Insights from the Northern Apennines of Italy

Understanding the Burial and Migration Characteristics of Deep Geothermal Water Using Hydrogen, Oxygen, and Inorganic Carbon Isotopes

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