Isotopic Investigation on the Evolution of Groundwater Dynamics in the Principal Aquifers in the Southern Dobrudja. Final Report for the Period 1 December 1983 - 30 November 1986

摘要

This study makes use of geology, tectonics, hydrogeology, hydrogeochemistry and environmental isotopes /sup 18/O, /sup 2/H, /sup 3/H, /sup 13/C and /sup 14/C to study the dynamics of groundwater in the southern Dobrudja region of Romania. The recharge areas of the various hydrogeologic units have been defined and the role of tectonic on groundwater circulation has been demonstrated. The existence of some areas with active ascending drainage along fractures has been proved. The Sarmatian groundwaters are recharged from surface waters while the Barremian-Jurassic aquifers are recharged from higher elevations as shown by the depleted stable isotope compositions. An actual flow velocity of V/sub r/=0.8 m/year and an effective porosity of M/sub e/=0.12 were determined in the littoral region of the Sarmatian formation. The actual flow velocity varies from 2.6 m/year in the Baneasa zone to 5.4 m/year in the Pestera-Tortomanu region and reaching 11 m/year in the Plopeni-Mangalia zone. Groundwater flow directions have been mapped and conform to what is obtained from groundwater levels. 24 refs, 32 figs, 19 tabs. (Atomindex citation 18:098590)