Jurassic Karst

Problem :

As a result of the low filtration capacity of karst, the water resources of associated hydrosystems are highly vulnerable to contamination. The goal of the JK action plan is to study the relationship between the biogeochemical functioning of the infiltration zone and the hydrochemical response of karst systems, while paying particular attention to the consequences of climate warming and changing land use.

Goal

The purpose of the “Jurassic Karst” (JK) plan, established in 2009, is to characterize the long-term evolution of karst hydrosystems of the Jura massif.

The specific topographic setting of the Jurassian arc makes it possible to study these processes at increasing altitudes along a climatic gradient. Plant cover and soil typology evolve along this gradient, thus modulating the biogeochemical functioning of the infiltration zone of the karst hydrosystems.

Location and timing

Monitoring four karst springs at locations of increasing altitude:

  • The Fourbanne site (valley of the Doubs, near Baume-les-Dames): altitude 330 m.
  • Lods site (high valley of the Loue): altitude 380 m
  • Fertans site (Amancey plateau): altitude 530 m
  • Source of the Doubs (Mouthe): altitude 950 m.

Physico-chemical parameters are monitored continuously at all sites and augmented/enhanced at the Fourbanne, Lods, and Fertans sites, where an automatic sampler performs major element analyses on two samples per week. The precise locations of these sites and the metadata of the observational parameters are available on the site Dat@OSU of the OSU THETA.