The study of water quality response characteristic in the process of surface water-groundwater interaction on the area of Songhua River

Study on the interaction between surface water and groundwater (SW-GW) can reveal the information that is vital to regional water resource protection, especially for typical irrigation regions in northeastern China. This study... [ view full abstract ]

Study on the interaction between surface water and groundwater (SW-GW) can reveal the information that is vital to regional water resource protection, especially for typical irrigation regions in northeastern China. This study investigated 10-km area on both sides of Songhua River, the northeast of China, and explored the characteristic of water quality response in different types of interaction. Three types of SW-GW interaction were classified with water levels’ relationship and water exchange capacity with the data of 18 monitoring sections: “recharge”, “discharge”, and “cross-flow”. According to different types of interaction, methods of Single factor index, principal component analysis, and hierarchical cluster analysis were applied in this study. The results demonstrated that the results demonstrated that the SW-GW interaction along the Songhua River basin was obvious: (1) groundwater usually discharges into surface water at upstream area of the Songhua River, (2) groundwater was recharged by surface water at downstream area, and (3) “discharge” and “cross-flow” were coexistence at midstream area.The results of statistical analysis indicated the degrees of water quality response in different types of hydraulic connection were various, which were obvious in “recharge” and “cross-flow” mode, and not obvious in “discharge” mode. During the interaction process, dilution, absorption, redox reaction, nitrification, denitrification, and biodegradation were contribute to change the concentration of pollutants, and affected the effect of water quality response in hyporheic zone.