A conceptual model of flow and transport in a karst aquifer based on spatial and temporal variations of natural tracers

Citation

Material Information

Title:
A conceptual model of flow and transport in a karst aquifer based on spatial and temporal variations of natural tracers
Creator:
Perrin, Jérôme
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Karst Aquifer ( local )
Carbonate Aquifer ( local )
Milandre Test Site ( local )
Epikarst ( local )
Infiltration ( local )
Transport ( local )
Isotope ( local )
Nitrate ( local )
Dissolution ( local )
Natural Tracers ( local )
Mixing ( local )
Chemographs ( local )
Spatio-Temporal Variability ( local )
Structure ( local )
Storage ( local )
Transit Times ( local )
Vulnerability ( local )
Local Scale ( local )
Catchment Scale ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
Karst aquifers represent an important groundwater resource world-wide. They are highly vulnerable to contamination due to fast transport through the system and limited attenuation of contaminants. The two main hydrogeological approaches developed for studying flow and transport are: inference of the system structure from karst spring hydrographs and chemographs; numerical modelling of flow and transport using a theoretical distribution of flow and transport field parameters. These two approaches lack of validation by detailed field measurements and observations. The main objective of this thesis is to “fill the gap” existing between field and model data. Observations of flow and transport parameters at several locations within the system were used to develop a conceptual model. This model was then compared to the existing models. The main field test site is the Milandre karst aquifer, located in the Swiss tabular Jura. Natural tracers (major ions, oxygen-18, specific conductance) and discharge were measured on the underground river, its main tributaries, percolation waters, and the main spring. These data were collected on a long-term basis in order to assess the spatial variability of the parameters, and on a short time scale (i.e. flood events) in order to investigate the dynamic processes. Complementary sites (Brandt and Grand Bochat) were used for more observations at the base of the epikarst. The proposed conceptual model considers four sub-systems: the soil zone, the epikarst, the unsaturated zone, and the phreatic zone. Each has its own specificity with respect to flow and transport. The soil zone controls the actual infiltration into the system. It contributes efficiently to groundwater storage. It mixes quickly stored water with fresh infiltrated water. Its thickness determines land-use: thick soils are generally cultivated whereas thin soils are under forested areas. The solutes concentration of soil waters depends on land-use for pollution-related parameters (nitrate, chloride, sulfate, potassium, sodi

Record Information

Source Institution:
University of South Florida Library
Holding Location:
University of South Florida
Rights Management:
This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.

USFLDC Membership

Aggregations:
University of South Florida
Karst Information Portal

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serial

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