HYDROGEOLOGICAL AND ENVIRONMENTAL ISOTOPE ASPECTS OF LAKE TOBA, NORTH SUMATRA, INDONESIA

摘要

Hydrogeological and environmental isotopes will be used to study the characteristics of Lake Toba. Fluctuation and decrease of the water level of Lake Toba during the last two decades have become major issues and have generated differing opinions among scientists. The size of Lake Toba is approximately 1784 km~2 (including Samosir Island, which lies within it). Samosir Island itself has an area of 840 km~2 (Fig. 1).