Baltic TRANSCOAST Seminar - Dr. Karsten Osenbrück

The steep growth in economy, agricultural production, and population since the 1990’s resulted in substantially increased stress on the water resources of the Mekong Delta in Vietnam. The overall goal of this study was to develop a conceptual model of the hydrogeochemical evolution along groundwater flow paths in the multilayered aquifer system. As an important step, this includes a reliable quantification of groundwater ages and their uncertainties using carbon isotopes. Although radiocarbon ages are in the expected range of 5 to 30 thousand years b.p., there is no increase in apparent ages along the presumed flow direction or with depth in the aquifer system. This might be due to an increased impact of vertical flow processes triggered by the strong water extraction over the last decades.

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