Stable Isotope and Hydrochemical Characteristics of Surface Water and Their Indicative Significance in Keluke-Tuosu Lake Basin
SUN Jihui
YU Yilei
MA Muyuan
ZHANG Bing
LYU Cuicui
LI Wenyan
Abstract：In order to understand the conversion relationship between fresh and brackish water and the source of ions in the Keluke-Tuosu Lake watershed,water samples were collected from Keluke-Tuosu Lake and the river during dry and wet seasons respectively in 2017.By means of statistics,Gibbs plots and ion ratios,the evolution mechanism of hydrogen and oxygen stable isotopes and water chemistry was analyzed.The results show that most of the lake and river water bodies are weakly alkaline(the pH value is 8.55)and strong oxidation potential(the mean OPR was 52.55 mV).Meanwhile,from dry to abundant water,Keluke Lake is converted from brackish water to fresh water,Tuosu Lake is converted from brackish water to salt water,and some freshwater from river water is converted to brackish water,and the hydrochemical type of lakes and rivers is Cl·SO4-Na·Ca·Mg and Cl·HCO3-Na type predominates.The excess rate of trace metal elements(Fe,Mn,As,Ni)in the dry period is greater than that in the abundant period.Under the influence of strong evaporation and occlusion of the lake body,Tuosu Lake eventually became an inland salt water lake,the stable isotopes of hydrogen and oxygen in the water of Tosu Lake were the most abundant(δ2H:-47.91‰～8.64‰,δ18O:-34.18‰～43.24‰),followed by Keluke Lake and river water.The chemical composition of lake water is mainly affected by evaporation crystallization,followed by rock weathering,while river water is dominated by water-rock interaction.The water quality was Keluke Lake,Tuosu Lake and River Water,and the water quality parameters were Na+,Cl-,SO42-and NO3-.Based on this,the results aim to provide a scientific basis for the protection of surface water quality in the northwest basin of China.
Keywords：Keluke-Tuosu Lakestable isotopes of hydrogen and oxygenwater chemistryprincipal component analysisfuzzy comprehensive evaluation
Publication Date：2023-08-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：14( 1-14 )