Further Understanding of the Supply Source of Shaizhudong Spring in the Central Weibei

摘要

Shaizhudong spring is the largest one in the central of Weibei, Shaanxi Province, China, for its supply source predecessors have done a lot of research, it was considered that Jinghe leakage is the main source of supply, and it is the concentrated discharge points of Shaizhudong spring area hidden karst system. In this paper, we have different understanding on recharge of Shaizhudong spring, based on the research achievements of hydrogen, oxygen and strontium isotope, combined with hydro geochemistry and karst hydro geological conditions. Isotope hydro geochemistry study shows the recharge is given priority to karst groundwater outside southwest of the Shaizhudong spring area, Proportion of atmospheric precipitation, river water and karst water were 11%, 37% and 52%, and proportion of Southwest, northwest and the dam site area karst water were 77.9%, 19.7% and 2.4%, respectively. The average residence time of Shaizhudong spring karst water is 62-64 years.