Study On Formation Mechanism And Influencing Factors Of Tubular Seawater Intrusion

Nowadays natural hazardous,say seawater intrusion,seawater in welling,surface subsidence and so forth happened to coastal areas and became increasingly serious.In recent years,with the rapid development of population and economic society,the coastal areas of seawater intrusion phenomenon more and more get the attention of people.Seawater intrusion problem is always the focus of the concern of the international community,underground dam being built in coastal zone is fairly effective engineering measures,prevention and treatment of seawater intrusion by blocking the water penetration invasion of channels and underground water drainage to prevent water invasion.The paper on the basis of the research methods of seawater intrusion,tubular seawater intrusion mechanism was discussed and the application of finite element software ABAQUS is used to numerically simulate tubular model of seawater intrusion in coastal zone.Specifically made the following work:1?Based on the research on the mechanism of seawater intrusion in Liaodong Bay coastal zone,this paper studied the influence of different influencing factors on the seawater intrusion in coastal zone from two aspects:thoretical analysis and numerical simulation.2?This paper collects a lot of information about seawater intrusion,including the model parameters needed for the study.This paper studies the influencing factors of seawater.intrusion,and analyzes the way,channel and basic equation of seawater intrusion,and finally obtains the mechanism of seawater intrusion.Which provides a thoretical basis for future numerical simulation of coastal seawater intrusion.3?The core part of this paper is numerical simulation analysis.Based on the theory of water-rock interaction,the ideal model of tubular seawater intrusion island is established by modeling ABAQUS finite element software.The influence of the head difference,seawater concentration,permeability coefficient and the slope of water surface on seawater intrusion distance and rate,ect.Also it's provide a theoretical basis for revealing the seepage mechanism,invasion and development trend of tubular seawater intrusion.The results show that there is a significant effect on the migration rate of coastal seepage invasion compared with other factors that affect the invasion of coastal seawater infiltration,and the change of seawater concentration and the change of seepage coefficient of seawater intrusion is oppisite to that of seawater intrusion smaller.The increase of seawater head and concentration leads to the extension of the seawater interface to the fresh water side,and the invasion rate increases.