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Study on Water-rock Interaction in Saltwater and Freshwater Transitional Zone

Author: LiuZuo
Tutor: ZhengXiLai
School: Ocean University of China
Course: Environmental Engineering
Keywords: Brackish transition zone Cation exchange Dissolution / precipitation Composition Distribution
CLC: P641
Type: Master's thesis
Year: 2007
Downloads: 179
Quote: 0
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Abstract


Fresh and sea water are miscible fluid, the fluid dynamic dispersion effect, the contact zone between the transition zone will be the form of the mixed water. So salty, fresh water transition zone between the salt concentration, ie salty - fresh water transition zone. Hydrogeological conditions in the offshore, due to the impact of natural and man-made, brackish water transition zone is not fixed in one position, saltwater and freshwater flooding each other, making brackish water transition zone will swing back and forth, but also accompanied by complex hydrogeochemical processes, including mineral dissolution cation exchange adsorption and precipitation. Almost all the world's coastal areas due to excessive exploitation of groundwater, have suffered different degrees of seawater intrusion in many areas to take the appropriate control measures. Therefore brackish water transition zone - rock interaction in-depth study is imminent, help promote seawater intrusion mechanism of regression for quantitative evaluation of seawater intrusion and prevention provide a scientific basis, which for the prediction and prevention of salt water intrusion and in various academic fields have a very important theoretical significance and practical value. In this paper, on-site geological, hydrogeological investigation, based on the determination of the study area (Qingdao Dagu River downstream) an aqueous medium, physicochemical properties and composition of water samples. Through trial and PREEQC batch mixing software, systems studied during mixing of freshwater mixing dissolution / precipitation; through ion exchange experiments, the cation exchange equilibrium time and studying the pattern, and using mass action equations to fit different analyzes temperature and particle size on cation exchange adsorption effects; using medium soil column, simulated brackish water flooding the dynamic process of mutual analysis brackish water flooding process multicomponent migration law, ion exchange and mineral dissolution / sedimentation process. Through this series of studies, obtained some new insights and conclusions, including: (a) an open system of sea water and fresh water mix is ??not a simple mechanical mixing process, but complex physical - chemical processes. Mixture of different proportions of both sea and fresh water mixed dolomite precipitation occurred, and the strict sense of the precipitation mixture; calcite mixed corrosion phenomenon occurs, some of the generalized mixing ratio of mixing dissolution, some strict sense of the mixing ratio of the mixed corrosion effect. (2) sand samples in 90 minutes each exchangeable cation exchange adsorption equilibrium can be achieved. To 15 minutes in the past as an ion exchange equilibrium time different results. (3) sand-like ion exchange adsorption / desorption performance: fine gravel partial group lt; powder coarse gravel group lt; clay; Gaines-Thomas equation can more accurately simulate ion exchange process; temperature for potassium, sodium , calcium and magnesium cations adsorption / desorption little effect. (4) sea and fresh water flooding tests showed that water - Iwama cation exchange effect is obvious. Fresh water during flooding in Na-Ca 2 exchange between the main, when Na-Ca 2 exchange reached exchange limit, Mg 2 cation exchange began to join the ranks of occurrence of Na-Mg 2 exchange between. In both exchange adsorption equilibrium is reached, Mg 2 by the sorption and desorption becomes Ca 2 exchange reaction occurs. K in the entire displacement process mainly for chemical adsorption. River water during flooding, Ca 2 -Na ion exchange occurs between, namely Ca 2 adsorption, Na desorption; subsequent Ca 2 , Mg 2 ion exchange, adsorption aquifer that Mg 2 is desorbed aqueous Ca 2 is aquifer adsorption; K ion exchange minimal. (5) the process of seawater intrusion, water has always been aggressive on the plaster; transgression proportion of about 40%, dolomite, calcite, aragonite precipitation begin until the invasion completely. Although dolomite, calcite, aragonite, gypsum dissolution / precipitation amount is very small (5mg / L inside), but its role can not be ignored.

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CLC: > Astronomy,Earth Sciences > Geology > Hydrogeology and Engineering Geology > Hydrogeology (groundwater hydrology )
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