Un fluorimètre de terrain compact et son application pour les essais de traçage en environnements karstiques

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

L’essai de traçage est une technique classique en hydrogéologie pour étudier les caractéristiques des écoulements de surface ou souterrains, et il est utile pour de nombreuses applications notamment pour des problématiques environnementales ou industrielles. Le fluorimètre de terrain Fluo-Green a été testé avec succès en milieu karstique et il est spécifiquement adapté pour le monitoring des eaux en grotte. La recherche en environnement karstique utilise souvent des traceurs pour obtenir des informations sur les écoulements d’eau souterraine dans des zones non-explorées. Le dispositif compact, aussi appelé Fluo-G, répond aux exigences du milieu souterrain : compact (10 × 16 × 21 cm), léger (0.75 kg sans lest) et de conception simple. Il est facile pour les spéléologues de le mettre en place et de le manipuler par rapport à d’autres méthodes d’échantillonnage. Le fluorimètre mesure l’uranine, la turbidité et la température avec un intervalle de temps défini par l’utilisateur (1 min – 1 jour). Sa très faible comsommation en énergie permet 9,000 mesures avec six piles AA. L’appareil a été calibré et testé en laboratoire et sur le terrain dans des systèmes karstiques belges. Les résultats sont en adéquation avec d’autres méthodes d’échantillonnage : fluorimètres in-situ et prélèvement automatique d’échantillons d’eau suivi d’analyses au laboratoire. L’enregistrement de données de haute qualité (courbes de restitution) en milieu karstique avec un monitoring en grotte est précieux pour améliorer la connaissance des systèmes karstiques. De nombreuses applications hydrologiques et hydrogéologiques peuvent bénéficier d’un tel équipement compact et peu coûteux. De plus, trouver le meilleur compromis entre les ressources disponibles et une bonne qualité des données est un élément essentiel. Plusieurs améliorations sont possibles mais les essais préliminaires sur le terrain sont très prometteurs.
Titre traduit de la contributionUn fluorimètre de terrain compact et son application pour les essais de traçage en environnements karstiques
langueAnglais
journalHydrogeology Journal
Les DOIs
étatE-pub ahead of print - 20 mars 2017

Empreinte digitale

karst
dye
cave
data quality
groundwater flow
sampling
breakthrough curve
hydrogeology
turbidity
water flow
surface water
monitoring
resource
cost
temperature
water
laboratory
method

mots-clés

  • Tracer tests
  • Karst
  • Groundwater monitoring
  • Fluorometer
  • Field technique

Citer ceci

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title = "A compact field fluorometer and its application to dye tracing in karst environments",
abstract = "Dye tracing is a classic technique in hydrogeology to investigate surface-water or groundwater flow characteristics, and it is useful for many applications including natural or industrial issues. The Fluo-Green field fluorometer has been successfully tested in a karst environment and is specifically suitable for in-cave karst water monitoring. Karst research often uses dyes to obtain information about groundwater flow in unexplored cave passages. The compact device, alternatively named Fluo-G, meets the requirements of cave media: small (10 × 16 × 21 cm), lightweight (0.75 kg without ballast) and simple in conception. It is easy for cavers to set up and handle compared to other sampling methods. The fluorometer records uranine, turbidity and temperature with a user-defined time-step (1 min – 1 day). Very low energy consumption allows 9,000 measurements with six AA batteries. The device was calibrated and tested in the laboratory and in field conditions in Belgian karst systems. Results are in good fit with other sampling methods: in-situ fluorometers and automatic water sampling plus laboratory analysis. Recording high quality data (breakthrough curves) in karst with in-cave monitoring is valuable to improve knowledge of karst systems. Many hydrological and hydrogeological applications can benefit from such a low-cost and compact device, and finding the best compromise between resources and quality data is essential. Several improvements are possible but preliminary field tests are very promising.",
keywords = "Tracer tests, Karst, Groundwater monitoring, Fluorometer, Field technique",
author = "Amael Poulain and Ga{\"e}tan Rochez and {Van Roy}, Jean-Pierre and Lorraine Dewaide and Vincent Hallet and {De Sadelaer}, Geert",
year = "2017",
month = "3",
day = "20",
doi = "10.1007/s10040-017-1577-1",
language = "English",
journal = "Hydrogeology Journal",
issn = "1431-2174",
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T1 - A compact field fluorometer and its application to dye tracing in karst environments

AU - Poulain,Amael

AU - Rochez,Gaëtan

AU - Van Roy,Jean-Pierre

AU - Dewaide,Lorraine

AU - Hallet,Vincent

AU - De Sadelaer,Geert

PY - 2017/3/20

Y1 - 2017/3/20

N2 - Dye tracing is a classic technique in hydrogeology to investigate surface-water or groundwater flow characteristics, and it is useful for many applications including natural or industrial issues. The Fluo-Green field fluorometer has been successfully tested in a karst environment and is specifically suitable for in-cave karst water monitoring. Karst research often uses dyes to obtain information about groundwater flow in unexplored cave passages. The compact device, alternatively named Fluo-G, meets the requirements of cave media: small (10 × 16 × 21 cm), lightweight (0.75 kg without ballast) and simple in conception. It is easy for cavers to set up and handle compared to other sampling methods. The fluorometer records uranine, turbidity and temperature with a user-defined time-step (1 min – 1 day). Very low energy consumption allows 9,000 measurements with six AA batteries. The device was calibrated and tested in the laboratory and in field conditions in Belgian karst systems. Results are in good fit with other sampling methods: in-situ fluorometers and automatic water sampling plus laboratory analysis. Recording high quality data (breakthrough curves) in karst with in-cave monitoring is valuable to improve knowledge of karst systems. Many hydrological and hydrogeological applications can benefit from such a low-cost and compact device, and finding the best compromise between resources and quality data is essential. Several improvements are possible but preliminary field tests are very promising.

AB - Dye tracing is a classic technique in hydrogeology to investigate surface-water or groundwater flow characteristics, and it is useful for many applications including natural or industrial issues. The Fluo-Green field fluorometer has been successfully tested in a karst environment and is specifically suitable for in-cave karst water monitoring. Karst research often uses dyes to obtain information about groundwater flow in unexplored cave passages. The compact device, alternatively named Fluo-G, meets the requirements of cave media: small (10 × 16 × 21 cm), lightweight (0.75 kg without ballast) and simple in conception. It is easy for cavers to set up and handle compared to other sampling methods. The fluorometer records uranine, turbidity and temperature with a user-defined time-step (1 min – 1 day). Very low energy consumption allows 9,000 measurements with six AA batteries. The device was calibrated and tested in the laboratory and in field conditions in Belgian karst systems. Results are in good fit with other sampling methods: in-situ fluorometers and automatic water sampling plus laboratory analysis. Recording high quality data (breakthrough curves) in karst with in-cave monitoring is valuable to improve knowledge of karst systems. Many hydrological and hydrogeological applications can benefit from such a low-cost and compact device, and finding the best compromise between resources and quality data is essential. Several improvements are possible but preliminary field tests are very promising.

KW - Tracer tests

KW - Karst

KW - Groundwater monitoring

KW - Fluorometer

KW - Field technique

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M3 - Article

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SN - 1431-2174

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