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从研究应用背景、基础理论及模型、实验模拟等方面就微咸水灌溉过程,侵入界面土壤渗透性变化进行分析研究。以衡水典型研究区微咸水分布及水质矿化度分析数据为基础,应用地球化学模式PHREEQC,结合水敏性机理分析矿物迁移的存在形式及各种形式之间的转化关系。结果表明:含高价离子农灌微咸水加快粘土胶体颗粒絮凝沉降能力强于低价离子,侵入过程矿化度梯度增加的同时渗透性降低,反向地球化学模拟表明粘土矿物大量参与水岩反应发生迁移转化。
From the application background, the basic theory and model, the experimental simulation and so on brackish water irrigation process, intrusion interface soil permeability analysis. Based on the data of brackish water distribution and water quality salinity in the typical study area of Hengshui, the geochemistry model PHREEQC was used to analyze the existing forms of mineral migration combined with water sensitivity mechanism and the transformation relations among various forms. The results show that brackish water containing high-priced ions aggravates the flocculation and sedimentation ability of clay colloidal particles stronger than low-valent ions, while permeability decreases with increasing salinity gradients during intrusion. Reverse geochemical modeling shows that clay minerals participate in water-rock reactions Migration and transformation occurred.