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- Title
Role of karstification and rainfall in the behavior of a heterogeneous karst system.
- Authors
Lastennet, R.; Mudry, J.
- Abstract
Focuses on complex functioning of karst systems, which depends on several factors (e.g., geology, karstification status, climate) which influence flow conditions. Understanding a system requires monitoring that includes a sampling interval well adapted to the system's size, and the use of hydrodynamic and geochemical approaches. From our own observations, the general physical and geochemical characteristics of the aquifers are perennial and representative of karst evolution at a given moment. The Notre-Dame-des-Anges karst system, which is situated in France on the rim of the Vaucluse karst region, was studied during 2 water years. This study demonstrates that several parameters are not definitive, and that they do not provide information about the actual status of the karst evolution of the system. We were able to observe that hydrological parameters in particular are dependent on the configuration of the outlets, which can dramatically change. For example, a heavy storm (300 mm of rain in 4 h), which occurred in the intake area on 22 September 1992, produced a piston effect in the aquifer, which was expressed by extensive unclogging of the whole aquifer. The appearance of a new gryphon at the outlet induced a change in the flow rate and added to the unclogging.
- Subjects
KARST; KARST conservation; RAINFALL probabilities; ENVIRONMENTAL geology
- Publication
Environmental Geology, 1997, Vol 32, Issue 2, p114
- ISSN
0943-0105
- Publication type
Article
- DOI
10.1007/s002540050200