Geology Reference
In-Depth Information
Karst reservoir
Primary karst spring
Secondary karst spring
Figure 90
Catchment basins for karst units in the front of the subalpine arc drained by the
Loup and Cagnes rivers (Alpes-Maritimes).
the precise pinpointing of groundwater fl ow patterns based on the
results of multi-tracer tests;
the general analysis of the relationship between discharge at the outlets
and the surface of the catchment basin, based on a specifi c infi ltration
module, locally placed at 18 L·s
1
·km
-2
;
2 DRAINAGE OF THE JURASSIC KARST MASS IN THE
BRAGUE BASIN, IN THE PROVENÇAL FORELANDS
OF THE ALPES-MARITIMES
The drainage is complicated by the vertical division of the area into two
units on either side of an impermeable horizon, by multiple exchanges with
its surroundings, and with largely hidden outlets.
The simplifi ed presentation of known mechanisms appears in Figure 91,
which provides a broad view of exchanges between the two karst aquifers
(upper and lower), the hydrographic network (the Brague river and its
tributaries, the Bouillide and the Valmasque), and the alluvial aquifer in
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