Chemical Characteristics and Influencing Factors of Surface Water in the Heihe River Basin of the Qinling Mountains

摘要

From April to October in 2017,water samples were collected from the Heihe River basin of the Qinling Mountains,and hydrochemical eigenvalues were analyzed. The comprehensive character description method,Gibbs plot,triangular diagrams of anions and cations,correlation analysis and factor analysis were used to analyze the chemical composition of surface water and its influencing factors. The results show that the runoff of the Heihe River basin was weakly alkaline with low mineralization. HCO_3~- content was the highest in all anions,while Ca~(2+) content was the highest in all of the cations. The hydrochemical type of the water body was HCO_3~--Ca~(2+). The main factor influencing the composition of chemical ions in the river water of the Heihe River basin was the weathering of calcite and other carbonate rocks. At the same time,the weathering of silicate rocks also had a certain influence on the hydrochemical composition of the basin.