Présentations Colloques

Oral Presentation
8.06
Session 8.06: Verification of conceptual patterns and expected natural effects of regional groundwater flow by interpretation of relevant field observations
Mihael Brencic
MYRE POOL SPRINGS AS INDICATOR OF REGIONAL DEPENDENT GROUNDWATER FLOW Ð CASE STUDY FROM LJUBLJANA MARSH SLOVENIA
Springs are important indicators of the hydrogeological conditions in the supplying aquifer. At the same time they are important natural heritage. South of Ljubljana (central Slovenia) extends 120 km2 of the former marsh where extensive bog deposits were formed in the past. Wetland was recharged with water from several rivers and springs flowing out from the karstic aquifers in the south. One system of the springs is positioned in the contact between large alluvial fan and marsh sediments. Springs appearance is variegated and their different morphologies are presents. In majority these springs are formed as pools where groundwater is ascending clearly indicating presence of the artesian pressure in the recharge area. Other springs are represented as pools where only moderate seepage of water is present.**In the paper morphology of the springs and their genesis is described. Appearance of the springs is related to the groundwater circulation in the alluvial fan where two aquifers are present+ one shallow unconfined and another deeper under confined conditions. Both aquifers are recharged from the extensive karstic aquifer surrounding the alluvial fan.**Groundwater flow in the area and appearance and morphology of the springs in the contact area between alluvial fan and marsh sediments can be only understood with the concepts of local and intermediate regional groundwater flow (sensu Toth).**
Slovenia