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Northwest A&F University (2021)

Research on Groundwater Hydrochemical Evolution and Recharge Mechanism in the Chinese Loess Plateau on Catchment Scale

刘鑫

Titre : Research on Groundwater Hydrochemical Evolution and Recharge Mechanism in the Chinese Loess Plateau on Catchment Scale

Auteur : 刘鑫

Grade : Master 2021

Université : Northwest A&F University

Résumé partiel
It’s of great importance to study the shallow groundwater along the Yellow River in the middle of Chinese Loess Plateau for the ecological civilization construction of the Loess Plateau and ecological protection and high-quality development of the Yellow River catchment.In this study,200 groundwater samples were collected from 14 major catchments of the Chinese Loess Plateau and their hydrochemistry and stable isotopes were measured.Piper diagrams,Gibbs,correlation analyzed and forward derivation modeling were used to analyze the distribution characteritics and its controlling factors of groundwater chemistry and stable isotopes in the Chinese Loess Plateau on catchment scale,which revealed groundwater quality evolution process and recharge mechanism.The results showed that :(1)The pH and TDS values of shallow groundwater in the Loess Plateau have no obvious distribution characteristics at the catchment scale.The groundwater is weakly alkaline and mainly fresh water.The dominant cation and anion of groundwater were HCO3-and Na+,respectively.and the main hydrochemical type was Ca-Mg-HCO3.In addition,91%of shallow groundwater belongs toⅠ-Ⅲclasses,9%belong toⅣ-Ⅴclasses,indicating that most groundwater can be directly drinkable.The water quality of most irrigation water meets the requirement at present,but better drainage facilities should be set up to avoid sodium damage.(2)The chemical composition of groundwater was mainly controlled by rock weathering,and evaporation also played a vital role,atmospheric input has little influence on groundwater solutes.According to the forward derivation modeling,the average contribution of atmospheric input to the groundwater solutes was 6±4%.The average contribution of groundwater solute from human activities was 5±8%.Significantly,rock weathering is the dominant source of groundwater solutes.

Mots clés : Hydrogeochemistry ;stable isotopes ;Yellow River ;Chinese Loess Plateau ;groundwater;

Présentation (CNKI)

Page publiée le 22 février 2022