标题：The distribution characteristics and hydrogeological significance of trace elements in karst water, Jinan, China
作者：Gao, Zongjun ;Xu, Junxiang ;Wang, Shichen ;Li, Changsuo ;Han, Ke ;Li, Jiajia ;Luo, Fei ;Ma, Hekuan
作者机构：[Gao, Zongjun ;Wang, Shichen ;Han, Ke ;Li, Jiajia ] College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 2 更多
来源：Earth Science Frontiers
摘要：Jinan, so-called Spring City, has been a famous city in the world due to its springs. The flow of the springs began to decrease in the second half of the 20th Century because of the exploitation of karst water, and outflows in some of the springs vanished for about several days or months every year since 1976. The intermittent phenomena of the flow disappeared at the end of the 20th Century, as the karst water exploitation was strictly restricted since that time. The geological surveys have been carried out one after another from 1980, while no definite conclusions have been drawn for the recharge area and the influence factors of the springs. Therefore, trace hydrogeochemical method is employed here to study the static distribution and dynamic change of the karst water in the probable spring basin during both the drought period and the wet season in 2011. The ionic concentrations of the wet season are smaller than that of the drought period, and they increase gradually from the southern recharge area to the northern spring zone. This observation revealed the entire chemical process of the recharge area, runoff area and outflow area. Afterwards, the karst water samples from Baotu Spring and adjacent regions were mixed and simulated based on MIX module of software PHREEQC. The result indicates that Baotu Spring is a multi-source spring and its water comes from several directions with various distances. By taking the geological structure and the hydrogeological conditions of survey area into consideration, it is concluded that springs in Jinan originate from multivariate sources and consist of both deep and shallow cycle waters. The permeable segment in the northern Qianfoshan Fault is a key factor for the formation of the Jinan spring group.