Study on the Hydraulic Relationship between Molin River and Groundwater

Molin River catchment is located in arid and semi-arid region in China. River water and groundwater are major water sources in this area. It is a key work to identify the interaction between river water and groundwater for not only water resources assessment and sustainable development, but residents living, industry and agriculture and environment protection. In this study, the interaction of Molin River water and groundwater has been analyzed systematically with hydrogeochemical and isotopic methods based on analyzing the characteristics of groundwater hydrodynamic field. The results show that Molin river water originates from groundwater in river source and is recharged by precipitation and groundwater with different recharge intensity along river flow. From the conclusions, it is obviously that these two parts of water cycle can not be departed, and their interactions need to be considered comprehensively in water resources assessment and development in order to avoid irreversible surface ecological environment damage in Molin River basin