Tracer-Based Solute Transport in Karst Aquifers
Summary
Karst aquifers, formed by the dissolution of carbonate rocks, exhibit a complex network of conduits, fractures and matrix pores that govern groundwater flow and solute migration. Tracer-based investigations employ substances—typically fluorescent dyes, salts or microbial surrogates—introduced at sink points to characterise travel times, flow velocities, dispersion and attenuation mechanisms. Breakthrough curves derived from field tests reveal the dominance of advection in high-velocity conduits, the role of stagnant zones in partial retardation and the influence of hydraulic conditions on the activation of secondary pathways. These methods inform conceptual and numerical models that account for multiscale heterogeneity, enabling prediction of contaminant spread and assessment of resource vulnerability. Practical applications range from delineating catchment boundaries and mapping recharge routes to quantifying pathogen transport risks and supporting groundwater protection strategies. Advances in high-resolution detectors, flow cytometry and inverse modelling have enhanced the precision of solute transport characterisation, while integration with geophysical and hydrometric data offers a more holistic view of karst dynamics under changing land use and climatic regimes.
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Tracer-Based Solute Transport in Karst Aquifers publication trend
The graph below shows the total number of articles in tracer-based solute transport in karst aquifers across all publications each year (not limited to Nature Index journals).
Technical terms
Karst aquifer: A groundwater system in soluble rock characterised by conduits, fractures and matrix porosity.
Solute tracer: A substance injected into water to trace flow paths, travel times and dispersion.
Breakthrough curve (BTC): A graph of tracer concentration versus time at a monitoring point.
Advection: Transport of solutes by the bulk movement of groundwater.
Dispersion: Spreading of solute plumes due to velocity variations and molecular diffusion.
Attenuation: Reduction in tracer concentration from processes such as adsorption, diffusion or biological interaction.
References
- Karst Water Resources in a Changing World: Review of Solute Transport Modeling Approaches. Reviews of Geophysics (2025).
- Long-distance transport of bacteriophages MS2 and phiX174 in karst aquifers. The Science of The Total Environment (2025).
- Back to the future: Comparing yeast as an outmoded artificial tracer for simulating microbial transport in karst aquifer systems to more modern approaches. Environmental Pollution (2024).
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