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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Use of conductivity meter LTC to characterize the flow of groundwater in well: Use of artificial well and field monitoring
 Rodovská, Žaneta ; Bruthans, Jiří (advisor) ; Procházka, Martin (referee)
My Master thesis is focused on a tracer dilution technique in the well using automatic conductivity logging probes LTC Levelogger (Solinst co. Canada). The main aim of my thesis was to test the application conductivity meters LTC to track the movement of fluids in wells. Different set up were used moving probes with unmodified sensor slit, moving probes with modified sensor slit, probes measuring at fixed points, combined moving and fixed points probes and results were compared. 15 wells in quaternary and 11 wells in Bohemian Cretaceous Basin were measured, some of them repeatedly. The comparison of results indicate that the highest apparent flow velocity have probes with unmodified sensor slit. On the other hand fixed point probes indicate flow velocity, which is 40 - 50% lower at the same wells. The combination of the stable positioned probe LTC and the moving probe LTC has about 40% higher flow velocity than the rate of steady probe LTC placed in the well. The results also indicate that extremely slow velocity values (below approximately 0.02 m/day) can be measured only with LTC probes at fixed points. Modified probe slit was tested in the laboratory in plexi-glass tube using fluorescein and NaCl tracers. Unfortunately the modified geometry of measuring slit does not show distinctively better...
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Use of conductivity meter to characterize the flow of groundwater in well: Use of artificial well
 Rodovská, Žaneta ; Bruthans, Jiří (advisor) ; Kobr, Miroslav (referee)
This Bachelor thesis is focused on the geophysical "tracer dilution technique" in the well. The main aim of my thesis was to test modern autonomous conductivity meter (Levelogger, Solinst co. Canada) for this method in the artificially assembler well, where the real flow rate can be measured and controlled unlike in case of real wells. To compare the flow rate directly measured on inflow tubes to well and indirectly derived from tracer dilution technique the mean residence time in vertical segments was used. Based on 8 experiments the autonomous conductivity meter and also conductivity meters with probe on cable can be used for tracer dilution technique. Experiments clearly demonstrated that salt solution is slowly leached even from dead zones in unscreened part of the well at lest several tens of cms from boundary with creened casing. Salt solution is migrating from dead zones to sreened parts of the well. As a result the tracer dilution technique gives up to 2 times slower horizontál flow rate than directly measured flow. Similar effect may exit on real wells. Powered by TCPDF (www.tcpdf.org)
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