Assessment of recharge and flowpaths in a limestone thermomineral aquifer system using environmental isotope tracers (Central Portugal)

Marques, Jorge S.; Eggenkamp, Hans; Graça, Henrique; Carreira, Paulà M.; Matias, M.J.; Mayer, Bernhard; Nunes, Dina

doi:10.1080/10256016.2010.491152

Cited by 11 publications

(13 citation statements)

References 18 publications

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“…wells QISB and LobFr; Table 3) down to the discharge area at the foothills south of the Dhofar mountains, or northwards into the Najd groundwater basin. Groundwater in fractured limestone aquifers, that is, under karstic conditions, keeps its isotopic compositions [23] or follows seasonal variations in rainfall composition with mixing depending on the geological conditions of the limestone aquifers as evident in typical karstic regions of Germany [24], Iran [25], Slovenia [26], Florida [27], and Portugal [28]. But also in the western part of Saudi Arabia, groundwater reflects the isotopic composition of the two main sources, monsoon and continental air masses, during its recharge [29].…”

Section: Isotope Pattern In Spring Watermentioning

confidence: 99%

Stable H and O isotope variations reveal sources of recharge in Dhofar, Sultanate of Oman

Strauch

Al-Mashaikhi²,

Bawain³

et al. 2014

Isotopes in Environmental and Health Studies

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Due to the ability of stable water isotopes to characterize the origin of water and connected processes of groundwater recharge, we used the isotope variations of hydrogen and oxygen in different water sources for assessing the recharge process in the Dhofar region. δ(18)O and δ(2)H of precipitation, spring water, and groundwater cover a range from -10 to +2 and from -70 to +7 ‰ (vs Vienna Standard Mean Ocean Water), respectively, and correlate in a linear relationship close to the Global Meteoric Water Line. No obvious evaporation processes are detected. A clear signal of the recent precipitation is given by the annual monsoon. The monsoon signal is confirmed by several springs existing in the south at the foot of the Dhofar mountains and sources at Gogub above 450 m and Tawi Atir at 650 m above sea level. They occur here first in the form of water intercepted by trees as stemflow and throughflow. The isotope signature of groundwater in the Dhofar mountains reflects the climatic conditions at the time of recharge and the lithological features of the limestone matrix. To the north, the isotope patterns of the groundwater are continuously depleted from the monsoon signal along the outcropping aquifer D (Lower Umm Er Radhuma). Here, a more negative signature towards the wells in the Najd desert region was observed. Cyclone water that flooded wadis in the Dhofar region occasionally, as observed in November 2011, falls isotopically into the same range as we observed in the fossil groundwater. Taking into account the different sources of precipitation and groundwater and thus a clear distinction of the isotopic composition of the water sources, we conclude a recharge process divided into a southward and a northward component in the Dhofar region.

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Section: Isotope Pattern In Spring Watermentioning

confidence: 99%

Stable H and O isotope variations reveal sources of recharge in Dhofar, Sultanate of Oman

Strauch

Al-Mashaikhi²,

Bawain³

et al. 2014

Isotopes in Environmental and Health Studies

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“…Following the previous knowledge in other thermal waters, such as Caldas da Rainha (Marques et al, 2010) and low-medium geothermal gradients (c. f. Correia and Ramalho, 2010) in the Portuguese Occidental Meso-Cenozoic Basin, the existence of warm springs in Alfama area can only be explained by the favorable conjunction of groundwater circulation in deep aquifer formations and faults or geological structures important enough to allow groundwater uprising towards the surface.…”

Section: Final Remarksmentioning

confidence: 65%

3D Modelling of a Hydrothermal System in a Densely Populated Urban Area – the Alfama Springs Case-Study (Lisbon, Portugal)

Marrero-Diaz¹,

Ramalho

Carvalho

et al. 2021

Preprint

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In the XIX th century, the Alfama thermal and non-thermal springs were qualified as “mineral water” by the governmental authorities. But after a few years of legal usage in balneotherapy, all of them knew a constant and progressive definitive decay, and the last balneotherapic facility was abandoned and sealed more than 40 years ago. Despite their significant influence in Lisbon life along the History, their exact location is now only approximate. Nowadays, they are all buried below the city buildings, squares and streets. Since some of the Alfama springs reached temperatures up to 34 °C, groundwater from these springs can be used in a new modern spa or in district heating facilities in the heart of the city of Lisbon, if adequately recovered. But priorly, to carry out this task, a global understanding of the conceptual hydrogeological model is needed. However, the springs are located in a densely urbanized and touristic area, where geological outcrops are no longer visible and old springs’ location is unknown; therefore, a review of geological and hydrogeological data and geotechnical reports was carried out to plan further research works. Adding to this exhaustive bibliographic review and data integration, new seismic reflection data were acquired, and brought some new insights on the groundwater circulation system. All these data interpretations contributed significantly to achieve a better knowledge on the main and secondary faults that control the occurrence of Alfama springs and framed them into the complex regional tectonic framework. The entire set of historical hydrogeological data, geotechnical information, and newly acquired data lead to a reasonably accurate and data supported 3D geological and hydrogeological conceptual model of the deep groundwater flow circuit. This paper describes the research work that led to the conception of the local and complex 3D hydrogeological model of the Alfama springs system. With this 3D model, the best location for a dipped well can now be envisaged, keeping in mind the narrow local urban constraints, possible future users, and stakeholders.

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“…Many methods, such as hydrodynamic methods [6,7], hydrochemical methods [8][9][10], and environmental isotope methods [11,12] have been reported for studying the relationship between groundwater recharging and discharging.…”

Section: Introduction 1research Statusmentioning

confidence: 99%

Mixed-Unit-Model-Based and Quantitative Studies on Groundwater Recharging and Discharging between Aquifers of Aksu River

Huang

2022

Sustainability

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The confined aquifer in the Aksu River Basin is the main aquifer for drinking water within the area. In this study, the unconfined aquifer and the confined aquifer in the Aksu River Basin were divided into different water circulation units through analysis of their flow field. After the hydrochemistry and isotope characteristics of each unit were analyzed, these data were used as water volume quantitative information of the aquifer according to the mixed-unit model. With this quantitative information, the transformation relationship between the unconfined aquifer and the confined aquifer, the recharging source, recharging amount, recharging proportion, and discharging amount of the confined aquifer were revealed. The results showed that the confined aquifer receives a recharge of 21.48 × 106 m3/a from the unconfined aquifer. The recharging sources of the confined aquifer in the middle and upper stream of the Aksu River mainly included side recharging and leakage recharging from the unconfined aquifer, while the confined aquifer received little recharging from unconfined aquifer downstream of the Aksu River and did not receive recharging from the unconfined aquifer in the southeast of the basin. Additionally, drainage methods of the confined aquifer were mainly lateral flowing and artificial well-group pumping. The side discharging volume through the whole area was 15.67 × 106 m3/a, and the artificial pumping volume was 21.20 × 106 m3/a. The confined aquifer was in a negative balance state from the middle-upper stream to the downstream. The downstream confined aquifer and its unconfined aquifer had a plane laminar flow movement, and the unconfined aquifer provided very little recharging to the confined one, which was further enhanced by the artificial well pumping and caused an accumulating negative balance state of the downstream aquifer.

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Assessment of recharge and flowpaths in a limestone thermomineral aquifer system using environmental isotope tracers (Central Portugal)

Cited by 11 publications

References 18 publications

Stable H and O isotope variations reveal sources of recharge in Dhofar, Sultanate of Oman

Stable H and O isotope variations reveal sources of recharge in Dhofar, Sultanate of Oman

3D Modelling of a Hydrothermal System in a Densely Populated Urban Area – the Alfama Springs Case-Study (Lisbon, Portugal)

Mixed-Unit-Model-Based and Quantitative Studies on Groundwater Recharging and Discharging between Aquifers of Aksu River

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