Evolution Characteristics And Mechanism Of Groundwater Water Chemical In People's Victory Canal Irrigation Areas

The people's Victory Canal Irrigation District is located in XinXiang of HeNan province,is a large irrigation area from the Yellow River,also is the important crop production bases in HeNan province.Under the effect of high intensity of human activities,the contradiction between supply and demand of water resources,groundwater pollution problems worse.Aiming at the problem of groundwater quality becomes poor,Select The people's Victory Canal Irrigation area as the study area,study on groundwater circulation and groundwater hydrochemical evolution characteristics,for regional development and protection of water resources has a certain significance.In this paper,the integrated use of mathematical statistics,GIS spatial analysis technology,water quality evaluation methods,Piper triangle graphic method,analyzes the characteristics of irrigation area of groundwater hydrochemical parameters,as well as water soluble total solid(TDS)and composition of the spatial distribution characteristics of main ions,reveals the space of groundwater solute evolution law;In the groundwater quality evaluation and analysis of hydrochemical type,reveals the type of water quality evolution law;Using ion ratio,the methods of multivariate statistical analysis,reveals the groundwater chemical types and evolution mechanism,analyzes the main factors that influence the evolution of groundwater chemical preliminary reveals the agricultural fertilizer,and drainage of groundwater and water level change and other factors on the influence of water chemical composition.Build the groundwater chemical model,simulates the different flow path of water rock interaction,analyzes the evolution process and law of groundwater solutes,quantified the anywhere under the hydrogeochemical processes and functions in the process of water flow.The main research results are as follows:(1)Groundwater chemical characteristics:In the irrigation area of groundwater main ion content chemical composition is relatively stable;Groundwater TDS values on the high side,in the study area presents from southwest to northeast gradually increasing trend,TDS higher regional distribution in irrigation area in northwestern and northern irrigation district;HCO3-the overall distribution characteristics and TDS content appear the opposite trend.Hydrochemical types along the groundwater flow to change regularly,from southwest to northeast water from Ca-HCO3 type to Na-HCO3 type water and Mg-HCO3 type water evolution.(2)Groundwater chemical evolution mechanismIon composition of groundwater in the study area mainly comes from the weathering process of rock leached effect is the main factors influencing the groundwater hydrochemical characteristics in the study area;The groundwater chemical evolution from agricultural fertilizer,and drainage of groundwater,and the influence of buried depth of groundwater.(3)The groundwater chemical simulation:The west of the water depth is shallow,the weathering dissolution and cation exchange;The east of the water depth is deeper,the mutagenicity of groundwater salt concentration,the plentiful water chemical reaction.