LIU Chang1，LV Hang1,2，WANG Hengan3
（1. College of Water Science, Beijing Normal University, Beijing, 100875 China;
2. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130026, China;
3. High School Attached to Northeast Normal University, Changchun 130026, China）
Abstract: Based on in-situ field tests, soil water content, soil temperature, and temperature, level and electrical conductivity of groundwater were measured systematically to analyze the recharging process of snowmelt to groundwater during the period of from February to May 2017 in Changchun. The hydrogen oxygen stable isotope technology was applied in describing recharging processes. The results showed that the local meteoric water line was δD=7.53δ18O-3.41 (R2=0.76). In the diagram of δD vs δ18O, the samples of the groundwater distributed mainly near the local meteoric water line, showing that groundwater was recharged mainly by snowmelt. The main recharging time of snowmelt was the twenty days of ambient temperature around 0℃, during this period, the groundwater level rise about 0.6m and correlated significantly (both correlation coefficients > 0.9) with temperature and conductivity of groundwater. In spring, the groundwater level began to decline as the result of industrial and agricultural water usages increasing. In the whole process, recharging contributions of snowmelt and water content in the loess stratum to the groundwater level were about 20.1% and 39%, respectively.
Key words: snowmelt; groundwater level; stable isotopes of hydrogen and oxygen; water balance; recharge
EARTH AND ENVIRONMENT Vol.48, No.1, Tot No.333, 2020, Page 38-45