Water exchange between groundwater and main stream of Shaying River

A numerical model of water exchange between a river and groundwater was established to study the water exchange in the section from Jieshou Station to Fuyang Station of the Shaying River.The results show that discharge through rivers is a major way in which groundwater discharges,and the water exchange between surface water and groundwater is characterized by groundwater replenishing surface water.The water exchange volume is directly correlated with hydraulic conductivity(C),and their relationship is nearly exponential.When C=100 m2/d,the discharge from the river to groundwater was 4.77×10-6 m3/(s·km) during the high flood stage period,and the phreatic water table within 1 000 m along the river was significantly affected by recharge;and in the dry season,the discharge from groundwater to the river was 7.26×10-3 m3/(s·km).Over-exploitation of groundwater may lead to a decrease in groundwater recharge and have a negative effect on river discharge in the Shaying River in the dry season.