Punctual and continuous estimation of transit time from dissolved organic matter fluorescence properties in karst aquifers, application to groundwaters of ‘Fontaine de Vaucluse’ experimental basin (SE France)

Blondel, Thibault; Emblanch, Christophe; Batiot‐Guilhe, Christelle; Dudal, Yves; Boyer, Daniel

doi:10.1007/s12665-012-1562-x

Cited by 16 publications

(12 citation statements)

References 36 publications

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“…The practical limitation of this is that the CNT architecture will plastically deform beyond some threshold strain 22. Similar nanotube forests have been impregnated by several matrix polymers including polystyrene23 and poly(methylmethacrylate),24 and by introducing a compliant, elastic matrix such as poly(dimethylsiloxane) (PDMS),25 this bed of springs can be supported to allow for high‐cycle recoverability. The compression of a material with such a high degree of filler orientation has yielded distinct orientation‐dependent deformation modes, allowing for the experimental isolation of behavior that assists in the fundamental understanding of how nanoscale fillers influence the bulk properties of nanocomposite materials.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of multiple crack growth in brittle materials with adaptive remeshing

Azadi

Khoei

2010

Numerical Meth Engineering

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SUMMARYIn this paper, an automated adaptive remeshing procedure is presented for simulation of arbitrary shape crack growth in multiple cracked bodies. The Zienkiewicz-Zhu error estimator is employed in conjunction with the modified superconvergent patch recovery (SPR) technique to obtain more accurate estimation of error. A stability analysis is performed to determine active cracks from a set of competitive cracks. Various crack growth criteria together with the respective crack trajectory prediction are compared. Several numerical examples are illustrated to demonstrate the efficiency, robustness and accuracy of computational algorithm in the simulation of multiple crack growth.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation of multiple crack growth in brittle materials with adaptive remeshing

Azadi

Khoei

2010

Numerical Meth Engineering

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“…Additionally, Batiot et al (2003) concluded from a study in the Nerja Cave (southern Spain) that total organic carbon (TOC) can be used as a sensitive natural tracer of infiltration processes. Blondel et al (2012) estimated at the Vaucluse spring, from fluorescence variations of organic matter, transit times of infiltration water using the excitation-emission-matrix (EEM) fluorescence spectra. A multi-parameter study at alpine karst springs in the western part of Austria investigated the transport dynamics of organic matter, faecal bacteria, and particulate matter with use of EEM-fluorescence spectra.…”

Section: Natural Tracersmentioning

confidence: 99%

Review: Advances in the methodology and application of tracing in karst aquifers

Benischke

2021

Hydrogeol J

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Tracer methods have been widely used in many fields of environmental and natural sciences, and also in human health sciences. In particular, tracers are used in the study of karst hydrogeology, typically focusing on phenomena such as sinkholes, sinking rivers and large karst springs. It is known that tracers have been used since antiquity. The aim of tracer tests has been to investigate underground flow paths, transport processes and water–rock interactions, and to get an insight into the functioning of a karst aquifer. In karst hydrogeology, tracer methods are the most important investigation tools beside conventional hydrological methods. In early times, tracer methods were applied only to investigate underground flow-paths. Later they were also used to elucidate transport processes associated with water flow, and today they are often the basis, together with detailed hydrological information, of groundwater protection investigations and aquifer modelling. Many substances (spores, microspheres, bacteriophages, salt tracers, fluorescent dyes, radioactive substances) have been investigated for their properties and potential usage in environmental investigations, in particular the often unknown and inaccessible underground systems of karst areas. A great number of analytical techniques is available. This includes instrumentation for laboratory applications and direct online, on-site or in-situ field measurements. Modern instruments have a high capability for data acquisition, storage and transmission in short intervals, as a basis for quantitative evaluation and modelling. This enables research on the hydrological and hydrochemical dynamics of aquifers and their response to different natural or anthropogenic impacts.

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“…The optical properties of the subgroup of DOM known as fluorescent dissolved organic matter (FDOM) have been shown to correlate with the biogeochemical characteristics of the larger pool . For example, studies by Blondel et al (2012) and Liu et al (2018) reported that FDOM served as good tracers for DOM in larger systems, especially tracking and monitoring of humic-acids.…”

Section: Assessing Dom Characteristics and Measuring Biodegradabilitymentioning

confidence: 99%

Measuring the influence of environmental conditions on dissolved organic matter biodegradability and optical properties: a combined field and laboratory study

Landsman-Gerjoi

Perdrial

Lancellotti³

et al. 2020

Biogeochemistry

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Dissolved organic matter (DOM) plays a vital role in biogeochemical processes and can flux CO2 to the atmosphere when labile fractions are degraded, hence DOM degradation is increasingly studied. Some studies have suggested that fluorescence-derived substrate characteristics are useful metrics for estimating bioavailability (as prerequisite condition for biodegradability), however, recent findings on soil organic matter emphasize the importance of ecosystem scale factors such as physical separation of substrate from soil microbial communities and soil physiochemical cycles driving organic matter stability. I extend this principle to soil derived DOM and hypothesize that such environmental conditions, covariant with season, land use and landscape position, impact the composition of soil DOM and activity and abundance of the microbial community, which together govern DOM biodegradability. As a result, DOM bioavailability may not reliably be predicted using substrate characteristics alone. To test these hypotheses, I assessed aqueous soil extracts for water extractable organic carbon (WEOC) content, biodegradability, microbial biomass and fluorescence spectroscopy on water extractable organic matter (WEOM) across a range of environmental conditions in northern Vermont, USA. My results indicate that changes in environmental conditions affect composition, quantity, and biodegradability of DOM. WEOC concentrations were highest in the fall and lowest in the summer, while no significant differences were found between land covers or landscape position, however, DOM biodegradability was significantly higher in the agricultural (AG) site across seasons. Despite a shift in utilized substrate from less aromatic DOM in summer to more aromatic DOM in winter, biodegradability was similar for all seasons. The only exception were cold temperature incubations where microbial activity was depressed, and processing was halted. These results indicate that bioavailability cannot be reliably predicted based on fluorescence-based metric alone, rather, my core findings illustrate a complex picture of how environmental conditions, landscape characteristics, and substrate composition interact to drive the biodegradability of labile carbon pools in the soil environment. This thesis includes i) a background and comprehensive review of literature to inform the reader of any relevant topics, ii) a paper submitted for publication to Biogeochemistry (Chapter 2), and iii) supplemental information containing figures and tables pertinent to the paper.

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Punctual and continuous estimation of transit time from dissolved organic matter fluorescence properties in karst aquifers, application to groundwaters of ‘Fontaine de Vaucluse’ experimental basin (SE France)

Cited by 16 publications

References 36 publications

Numerical simulation of multiple crack growth in brittle materials with adaptive remeshing

Numerical simulation of multiple crack growth in brittle materials with adaptive remeshing

Review: Advances in the methodology and application of tracing in karst aquifers

Measuring the influence of environmental conditions on dissolved organic matter biodegradability and optical properties: a combined field and laboratory study

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