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Cave volume computed on the behaviour of a blowing well (Tournai basin, W. Belgium)
Author(s) -
Massen,
Dusar,
Loy,
Vandenberghe
Publication year - 1998
Publication title -
terra nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.353
H-Index - 89
eISSN - 1365-3121
pISSN - 0954-4879
DOI - 10.1046/j.1365-3121.1998.00179.x
Subject(s) - sinkhole , karst , outflow , geology , inflow , cave , hydrogeology , atmospheric pressure , structural basin , vadose zone , volume (thermodynamics) , hydrology (agriculture) , airflow , geomorphology , groundwater , geotechnical engineering , paleontology , oceanography , physics , archaeology , quantum mechanics , history , mechanical engineering , engineering
It is difficult to measure karst volume but important to do so to assess risk of sinkhole formation. Measurements of airflow and atmospheric pressure pattern on a water well in buried karst of the overexploited Tournai hydrogeological basin (Belgium) show that inflow and outflow are highly correlated to atmospheric pressure and the differences of external and internal air densities. The volume of natural voids in connection with the well within the vadose zone can best be estimated by a calculation based on outflow under constant atmospheric pressure, which suggests a possible cavity volume of 700 000 m 3 indicating likelihood of sinkhole formation.