Transit Time Environmental Tracing from Dissolved Organic Matter Fluorescence Properties in Karstic Aquifers. Application to Different Flows of Fontaine de Vaucluse Experimental Basin (SE France)

Blondel, T.; Emblanch, Christophe; Dudal, Yves; Batiot‐Guilhe, Christelle; Travi, Yves; Gaffet, Stéphane

doi:10.1007/978-3-642-12486-0_22

Cited by 10 publications

(9 citation statements)

References 11 publications

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“…At Golgotha Cave, the collection of drip logger data is ongoing, as well as analysis of tracers of water movement such as stable isotopes. These data will be the focus of future research to expand the possibility of classifying geochemical properties of drip regimes covering large-scale observation, and even describing the hydrodynamic response of the unsaturated zone in the cave (Carrasco et al, 2006;Blondel et al, 2010;Mudry et al, 2008).…”

Section: Resultsmentioning

confidence: 99%

Estimation of deep infiltration in unsaturated limestone environments using cave lidar and drip count data

Mahmud¹,

Mariethoz

Baker³

et al. 2016

Hydrol. Earth Syst. Sci.

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Abstract. Limestone aeolianites constitute karstic aquifers covering much of the western and southern Australian coastal fringe. They are a key groundwater resource for a range of industries such as winery and tourism, and provide important ecosystem services such as habitat for stygofauna. Moreover, recharge estimation is important for understanding the water cycle, for contaminant transport, for water management, and for stalagmite-based paleoclimate reconstructions. Caves offer a natural inception point to observe both the long-term groundwater recharge and the preferential movement of water through the unsaturated zone of such limestone. With the availability of automated drip rate logging systems and remote sensing techniques, it is now possible to deploy the combination of these methods for largerscale studies of infiltration processes within a cave. In this study, we utilize a spatial survey of automated cave drip monitoring in two large chambers of Golgotha Cave, southwestern Western Australia (SWWA), with the aim of better understanding infiltration water movement and the relationship between infiltration, stalactite morphology, and unsaturated zone recharge. By applying morphological analysis of ceiling features from Terrestrial LiDAR (T-LiDAR) data, coupled with drip time series and climate data from 2012 to 2014, we demonstrate the nature of the relationships between infiltration through fractures in the limestone and unsaturated zone recharge. Similarities between drip rate time series are interpreted in terms of flow patterns, cave chamber morphology, and lithology. Moreover, we develop a new technique to estimate recharge in large-scale caves, engaging flow classification to determine the cave ceiling area covered by each flow category and drip data for the entire observation period, to calculate the total volume of cave discharge. This new technique can be applied to other cave sites to identify highly focussed areas of recharge and can help to better estimate the total recharge volume.

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Section: Resultsmentioning

confidence: 99%

Estimation of deep infiltration in unsaturated limestone environments using cave lidar and drip count data

Mahmud¹,

Mariethoz

Baker³

et al. 2016

Hydrol. Earth Syst. Sci.

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“…The correlation matrix (Table 1) showed generally poor correlation coefficients. Only the Electrical Conductivity (EC) was significantly correlated with soluble major elements (Ca 2+ , SO 4 2− , Mg 2+ , Cl − , Na + ) with correlation coefficients close to 0.75-0.85. These major ions were moderately correlated with each other, with the correlation between Na + and Cl − being the highest.…”

Section: Principal Component Analysismentioning

confidence: 97%

“…Groundwater conveys information acquired during its journey from the surface to the aquifer [1]. Its composition reflects the inputs from the atmosphere, and the interactions with the vegetation cover, presence of agricultural or industrial activities, characteristics of the soil through which it percolated, and lithology of the geological formations that shelter the aquifers [2][3][4][5][6][7][8][9]. Thus, the chemical and bacteriological composition of the water is a source of information that can help characterize different landscape units and the impact of human and industrial activities [10].…”

Section: Introductionmentioning

confidence: 99%

Dimension Reduction and Analysis of a 10-Year Physicochemical and Biological Water Database Applied to Water Resources Intended for Human Consumption in the Provence-Alpes-Côte d’Azur Region, France

Tiouiouine

Yaméogo

Vallès

et al. 2020

Water

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The SISE-Eaux database of water intended for human consumption, archived by the French Regional Health Agency (ARS) since 1990, is a rich source of information. However, more or less regular monitoring over almost 30 years and the multiplication of parameters lead to a sparse matrix (observations × parameters) and a large dimension of the hyperspace of data. These characteristics make it difficult to exploit this database for a synthetic mapping of water quality, and to identify of the processes responsible for its diversity in a complex geological context and anthropized environment. A 10-year period (2006–2016) was selected from the Provence-Alpes- Côte d’Azur region database (PACA, southeastern France). We extracted 5,295 water samples, each with 15 parameters. A treatment by principal component analysis (PCA) followed with orthomax rotation allows for identifying and ranking six principal components (PCs) totaling 75% of the initial information. The association of the parameters with the principal components, and the regional distribution of the PCs make it possible to identify water-rock interactions, bacteriological contamination, redox processes and arsenic occurrence as the main sources of variability. However, the results also highlight a decrease of useful information, a constraint linked to the vast size and diversity of the study area. The development of a relevant tool for the protecting and managing of water resources will require identifying of subsets based on functional landscape units or the grouping of groundwater bodies.

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“…At both sites, the karst vadose zone isotopic signal is provided by underground seepage and springs. At Rustrel, two seepage zones named "point D" and "point C" (at 33 m and 256 m below the surface, respectively) have been monitored since 2003 (Garry et al 2008;Blondel et al 2010) in the Low Noise Underground Laboratory tunnel (http://lsbb.eu/presentation/). At the Mont Ventoux site, two springs are present: Mont Serein spring (MtS), located at a distance of 1.6 km from the experimental plot (44°10'51.47'' N; 5°15'48.25'' E; 1446 m.a.s.l.…”

Section: Environmental and Groundwater Settingsmentioning

confidence: 99%

The role of deep vadose zone water in tree transpiration during drought periods in karst settings – Insights from isotopic tracing and leaf water potential

Carrière¹,

Martin‐StPaul²,

Cakpo

et al. 2020

Science of The Total Environment

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Karst environments are unusual because their dry, stony and shallow soils seem to be unfavorable to vegetation, and yet they are often covered with forests. How can trees survive in these environments ? Where do they find the water that allows them to survive? This study uses midday and predawn water potentials and xylem water isotopes of branches to assess tree water status and the origin of transpired water. Monitoring was conducted during the summers of 2014 and 2015 in two dissimilar plots of Mediterranean forest located in karst environments. The results show that the three monitored tree species (Abies alba Mill, Fagus sylvatica L, and Quercus ilex L.) use deep water resources present in the karst vadose zone (unsaturated zone) more intensively during drier years. Quercus ilex, a species welladapted to water stress, which grows at the drier site, uses the deep water resource very early in the summer season. Conversely, the two other species exploit the deep water resource only during severe drought. These results open up new perspectives to a better understanding of ecohydrological equilibrium and to improved water balance modeling in karst forest settings. 1-Introduction: Changes in temperature and rainfall patterns across many forest ecosystems are expected to increase the risk of drought-induced tree mortality (Allen et al. 2010). Tree resistance to drought is therefore of concern to scientists (Chaves et al. 2002; Breda et al. 2006) and stakeholders (Spies et al. 2010; Keenan 2015). To cope with drought, trees have developed various strategies at different time scales. Stomata closure is a universal process designed to limit transpiration (Limousin et al. 2010), avoid water potential drop, and prevent irreversible damage caused by embolism to the plant hydraulic system (Martin-StPaul et al. 2017). Other mechanisms that take place at longer time scales involve changes in leaf area to decrease water consumption (Limousin et al. 2009, van Hees 1997, Martin-StPaul et al. 2013). Instead of regulating water loss, trees can also take up water from groundwater when the water table is accessible (e.g.

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Transit Time Environmental Tracing from Dissolved Organic Matter Fluorescence Properties in Karstic Aquifers. Application to Different Flows of Fontaine de Vaucluse Experimental Basin (SE France)

Cited by 10 publications

References 11 publications

Estimation of deep infiltration in unsaturated limestone environments using cave lidar and drip count data

Estimation of deep infiltration in unsaturated limestone environments using cave lidar and drip count data

Dimension Reduction and Analysis of a 10-Year Physicochemical and Biological Water Database Applied to Water Resources Intended for Human Consumption in the Provence-Alpes-Côte d’Azur Region, France

The role of deep vadose zone water in tree transpiration during drought periods in karst settings – Insights from isotopic tracing and leaf water potential

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