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Determination of aquifer geometry through geophysical methods: A case study From Quetta Valley, Pakistan

Alam K., Ahmad N.

Acta Geophysica

2014

Vol. 62, no. 1

142--163

Due to increase in population and agricultural activities, the aquifer of Quetta Valley is under tremendous stress and the water table is declining at an increasing rate. This situation necessitates evaluation of the aquifer system, for which information about geometry of the aquifer is a prerequisite. However, there are no drilling-to-bedrock data available; therefore, electrical resistivity, seismic reflection and gravity methods were employed to determine geometry of the aquifer. Interpretation of vertical electrical soundings provided information about the depth-tobedrock at some specific points, whereas seismic reflection delineated bedrock topography along two lines. The depths to bedrock inferred from electrical resistivity and seismic reflection data were used as constraints in the modeling of gravity data. 2.75D gravity models were constructed along lines with a regular spacing. Map of depth-to-bedrock was prepared by contouring the depth given by the gravity models. Combination of these geophysical methods depicted the geometry of the aquifer. This example shows that in a similar geological setting proper integration of geophysical exploration methods can determine the aquifer geometry with an acceptable reliability and at an appropriate cost.

Charakterystyka rezystancyjna wilgotnej masy formierskiej

Szmigielski T.

Archiwum Odlewnictwa

2004

R. 4, nr 14

508-513

W pracy opisano sposób wyznaczenia krzywej wzorcowej dla wybranej masy formierskiej wyrażającej przebieg oporności elektrycznej masy w funkcji zawartości wilgoci. Stwierdzono, że charakterystyki rezystancji w funkcji wilgotności można opisać zależnością dla modelu wykładniczego: y = [...] dla W>2%. Wykazano, że odległość pomiędzy parą elektrod w badanym zakresie x =10 do 30 mm ma wpływ na uzyskiwane wartości rezystancji badanej masy.

The paper describes a method of determining an analytical curve for a chosen moulding sand presenting a run of (electric) conductivity of the moulding sand in a dampness content function. It was found out that the characteristics of conductivity in the dampness function can be described by the following dependence y = [...] for W>2%. It was proved that the distance between a pair of eIectrodes in the range in question x =10 to 30mm has much less influence on the achieved values of the tested moulding sand resistance than it had been assumed.