Evaluation Of Groundwater Resources In Plain Area Of Zhang Wei River Basin And Relationship Between Surface Water And Groundwater Conversion In Typical Section

In recent years,exploitation of groundwater,warmer climate and less rainfall in North China Plain have changed natural hydrogeological conditions,causing many other environmental geological problems,including some rivers have dried up,groundwater funnels,seawater erodes.Therefore,it is very important to research the links of these shifts between surface water and groundwater by investigating the hydrogeological conditions in this area and understanding the groundwater resources in salt water areas.This paper selects the Zhangwei River basin plain area in the North China Plain as the studying object,based on the analysis of geological and hydrogeological conditions,water resources evaluation of different degree of mineralization in the area of underground water;combined with water chemistry and environmental isotope method,transformation of typical areas of surface water and groundwater Analysis.In the plain area of Zhangwei River Basin,water basically is salty.Based on the underground water salinity balance calculation and analysis,the area of shallow groundwater and deep groundwater on the whole are in negative equilibrium,namely the excretion of groundwater is more than the supply;and the main recharge sources of shallow groundwater and precipitation,mainly for the excretion of artificial exploitation;Also the TDS<3g/L area,the shallow groundwater is in the negative balance,which the recharge resources is less than the discharge of groundwater.However,the TDS>3g/L area is basically balanced,the recharge resources is greater than discharge resources,this phenomenon may be due to the areas of greater water quality has a large number of mining,and water quality is not good place has a small amount of mining.Therefore,we should reasonably exploit the shallow water,fresh water,and deep water in the area to sustainable utilization.The typical area is located in the Zhang River and the Wei River Interchange,which belongs to the Zhangwei River alluvial plain area.By analyzing The water level data of Nan Tao hydrometric station in Guantao County,and surrounding the national groundwater monitoring water level data show that in 2010,2014.the Nan Tao hydrometric station River level in flood season was higher than that of the groundwater level,which is show that river water recharge groundwater;Three section were selected in Zhang River,Wei River,Weiyun River to analyze the chemical characteristics of the water.The concentration of Cl-in the shallow groundwater near the river surface changed frequently and showed an increasing trend,which was greater than the concentration of Cl-in the river.The concentration of Cl-in shallow groundwater away from the river has not changed much,which is in a relatively stable state and close to the concentration of Cl-in the river.The analysis shows that the concentration of Cl-in shallow groundwater in the near river area is related to river water,and the groundwater in the near river area is replenished by river,the water level rises,there is evaporation,making the Cl-concentration increase;at the same time,the results of hydrogen and oxygen isotope test results show that river water and shallow groundwater all come from atmospheric precipitation,and the river water and shallow groundwater have mutual transformation relationship.Comprehensive analysis of the role of water level,water chemistry,and isotopes in the conversion of river water and groundwater indicates that surface water is recharged to groundwater in a typical section.