Inverse modeling of natural tracer transport in a granite massif with lumped-parameter and physically based models: case study of a tunnel in Czechia

Balvín, Aleš; Hokr, Milan; Šteklová, Klára; Rálek, Petr

doi:10.1007/s10040-021-02389-x

Cited by 3 publications

(2 citation statements)

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“…We used meteorological, hydrological, and groundwater monitoring data from 1980 to 2017 for the study area, both before and after the operation of the Xiaolangdi Reservoir. The principles of groundwater dynamics and a one-dimensional seepage model of "dual structure" were applied to calculate and analyze the influence zone width of the secondary perched reach before and after the operation of the reservoir [14,27]. Additionally, the hydraulic slope J = ∆h/L of the groundwater level in the secondary perched reach and in the wells was calculated based on the infiltration influence distance of the secondary perched reach and the hydrogeological conditions of the study area [13].…”

Section: Methodsmentioning

confidence: 99%

Impact of Xiaolangdi Reservoir on the Evolution of Water Infiltration Influence Zones of the Secondary Perched Reach of the Lower Yellow River

Zhang,

Ping,

Zou

et al. 2023

Water

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Understanding the complex interplay between water management infrastructure and groundwater dynamics is crucial for sustainable resource utilization. This study investigates water infiltration dynamics in the secondary perched reach of the Yellow River after the operation of the Xiaolangdi Reservoir. The methodology included the application of the single-factor analysis of variance and water balance method, alongside a dual-structure, one-dimensional seepage model to simulate interactions within the system, while exploring characteristics of the groundwater flow system and the exploitation depth of below 100 m. Furthermore, we studied the influence zone range and alterations in river water infiltration in the secondary perched reach of the river following the operation of Xiaolangdi Reservoir. The results show that before the operation of the reservoir, the influence ranges of the north and south banks of the aboveground reach extended from 20.13 km to 20.48 km and 15.85 km to 16.13 km, respectively. Following the initiation of the reservoir, the river channel underwent scouring, leading to enhanced riverbed permeability. Additionally, the influence of long-term groundwater exploitation on both riverbanks extended the influence range of groundwater recharge within the secondary perched reach of the river. The influence zone of the north bank is now 23.41 km–26.74 km and the south bank 18.43 km–21.05 km. After years of shallow groundwater extraction, multiple groundwater depression cones emerged within the five major groundwater source areas on both sides of the river. Notably, deeper water levels (Zhengzhou to Kaifeng) have significantly decreased, with a drop of 42 m to 20 m to 15 m. This change in groundwater dynamics extended beyond the main channel of the river, creating a localized shallow groundwater field.

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Section: Methodsmentioning

confidence: 99%

Impact of Xiaolangdi Reservoir on the Evolution of Water Infiltration Influence Zones of the Secondary Perched Reach of the Lower Yellow River

Zhang,

Ping,

Zou

et al. 2023

Water

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“…Note This topical collection brings together selected studies illustrating hydrogeologic problems that were presented and discussed at the international conference on 'Groundwater in Fractured Rocks', Chaves, Portugal, in 2017. The articles are: Lachassagne et al (2021), Blake et al (2021), Moore and Walsh (2021), Balvín et al (2021), and Naves et al (2021).…”

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confidence: 99%

Topical Collection: Progress in fractured-rock hydrogeology

Troeger¹,

Chambel

2021

Hydrogeol J

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The development of hydrogeology with respect to hard-rock and fractured-rock aquifers is described. The differences between porous aquifers and karst are explained, as well as the groundwater flow regimes in the different fractured rocks. A position is taken on numerical modeling, from the beginning of modeling to the present day, with focus on particular challenges. Because of the importance of fractured-rock aquifers, the tools for groundwater exploration and future resource management are mentioned. The essay introduces a topical collection of articles. KeywordsFractured rocks • Groundwater flow • Fracture rock models • Groundwater management This article is part of the topical collection "Progress in fracturedrock hydrogeology" * Uwe Troeger

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Short high-accuracy tritium data time series for assessing groundwater mean transit times in the vadose and saturated zones of the Luxembourg Sandstone aquifer

Gourdol,

Stewart,

Morgenstern

et al. 2024

Hydrol. Earth Syst. Sci.

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Abstract. Among the manifold of environmental tracers at hand, tritium is the only one that can give information on groundwater age within the timescale of 100 years for the entire flow system, i.e., unsaturated and saturated. However, while in the Southern Hemisphere, a single water sample is sufficient for tritium-based young groundwater dating, several tritium measurements spanning multiple years are still needed in the Northern Hemisphere to disentangle the natural cosmogenic tritium input from that caused by the atmospheric thermonuclear weapons tests mainly carried out in the early 1960s. Although it is advised to focus tritium dating on sites where long chronicles of tritium data are available, in this study we tested the potential for short high-accuracy tritium data series (∼4 years) to date groundwater from 35 springs draining the Luxembourg Sandstone aquifer (central western Europe). We determined groundwater mean transit times using the lumped-parameter model approach in a Monte Carlo uncertainty estimation framework to provide uncertainty ranges inherent to the low number of tritium data at hand and their related analytical errors. Our results show that unambiguous groundwater mean transit time assessments cannot be determined solely based on such recent short tritium time series, given that several ranges of mean transit times appeared theoretically possible. Nonetheless we succeeded in discriminating groundwater mean transit times in the vadose and saturated zones of the aquifer through a stepwise decision process guided with several supplementary data. The mean transit time required for water to cross the vadose zone was estimated to be between 0.5±0.5 and 8.1±1.2 years depending on the spring, while for water to flow through the saturated zone, it varied from 5.7±2.4 to 18.9±4.6 years (median ± half of the 5–95 percentile range). Our findings are consistent with both the tritium measurements of individual springs and the hydrogeological context of the study area. We specifically corroborated the dating results using the known hydrogeological properties of the Luxembourg Sandstone aquifer, the hydrochemistry of the studied springs, and their discharge dynamics. When translated into water velocities (which average ∼12 and ∼170 m yr−1 for the vadose and the saturated zones, respectively), the tritium dating results mirrored the horizontal–vertical anisotropy of the aquifer's hydraulic properties caused by the bedded character of the Luxembourg Sandstone. In addition to improving our understanding of water transit times in the Luxembourg Sandstone aquifer, this study demonstrates how it is currently possible to use short tritium time series to date young groundwater bodies at new sites in central Europe.

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Inverse modeling of natural tracer transport in a granite massif with lumped-parameter and physically based models: case study of a tunnel in Czechia

Cited by 3 publications

References 43 publications

Impact of Xiaolangdi Reservoir on the Evolution of Water Infiltration Influence Zones of the Secondary Perched Reach of the Lower Yellow River

Impact of Xiaolangdi Reservoir on the Evolution of Water Infiltration Influence Zones of the Secondary Perched Reach of the Lower Yellow River

Topical Collection: Progress in fractured-rock hydrogeology

Short high-accuracy tritium data time series for assessing groundwater mean transit times in the vadose and saturated zones of the Luxembourg Sandstone aquifer

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