Milandre test site, Laufen valley and Tabular Jura near Basel.

Field trip leaders: Dr. Pierre-Yves Jeannin (ISSKA), Prof Dr. P. Huggenberger, University of Basel, and Dr. Christoph Butscher (KIT)

Important dates and information:

Start: Thursday, 8 September 2016, 8:00

End: Friday, 9 September 2016, about 18:00

Number of participants: 40 maximum

Overnight stay: At the Hôtel Ibis Delémont Delsberg. Single or twin rooms.

Costs: CHF 280 (single room) / CHF 230 (twin shared room)

Character of the trip: Travel by bus, short walks.

Meals: Picnic for lunch on Thursday and Friday will be provided, dinner and breakfast in Delémont.

Description:

Day 1 will be focused on the Milandre test-site located in Northern Switzerland, in the front plateaus of the Jura Mountains. The excursion will be guided by Dr. Pierre-Yves Jeannin.  Many experiments (e.g. more than 100 tracer tests) have been carried out in the site allowing to provide a sophisticated conceptual model of flow in this system as well as a quantification of dissolution processes and of related variations in water chemistry. Observations seem to indicate that mineralization increased by about 10% along the last 25 years, this is very probably related to climate warming. Measurements of soil pCO2, of cave air, of water chemistry along the cave stream reveal some surprising processes controlling chemographs observed at the spring. The cave was also used for paleoclimatic reconstructions based on the analysis of speleothems.  The excursion will include a visit of the springs, of the cave, of the CO2 measurement stations in soils, of the tunnel portal located above the cave, of drillholes and of various surface features.

Day 2. After a night in Delémont, Prof Dr. P. Huggenberger and Dr. Christoph Butscher will guide the second day of this excursion in the Jura mountains. The main topic will be to discuss how groundwater resources in Karst may be affected by agriculture, anthropogenic activities and climate change and how sustainable management plans could be developed. Modeling of karst systems provide much insight in the dynamic of these systems. Rapid changes in spring water quality in karst areas due to rapid recharge of bacterially contaminated water are a major concern for drinking water suppliers and users. An objective of the this second day will be to present and discuss results of field experiments to understand the vulnerability of Karst springs in different geological and tectonic environments in the Laufen valley and in the Tabular Jura near Basel.