Abstract:

It is the key work to determine the hydraulic relationship between surface water and groundwater for setting up the local water hydrologic cycle, opening out water resources forming-mechanism, evaluating water resources quantity and sustainably developing water resources. In Malianhe River catchment located in arid and semi-arid climatic zones, water resources are unevenly distributed in temporal and spatial with fragile ecological environment, therefore water resources problem become serious. Affected by local climate, geological structure and geographical environment,the interaction between river water and groundwater can not be understood yet due to the frequent and complex interaction. Therefore, the interaction of surface water and groundwater has been studied by hydrogeochemical and isotopic methods based on analyzing the characteristics of groundwater hydrodynamic field. Through the analysis, it can be known that Malianhe River water is dominantly recharged by the groundwater of Lower Cretaceous Huanhe aquifer except for minority section in the midstream where hydraulic connection between the river and the groundwater is weak.

Key words: Malianhe River, hydraulic relationship between river and groundwater, hydrogeochemical, isotope, groundwater