潍河下游地区海咸水入侵动态三维数值模拟分析

• 作 者: 陈鸿汉 王新民 张永祥 任仲宇
• 机 构: 中国地质大学!北京100083,长春科技大学!长春130026,长春科技大学!长春130026,建设部城市水资源研究中心!北京100007
• 出 处: 地学前缘
• 发表日期: 2000年S2期
• 关键词: 咸水入侵 潍河 地下淡水 三维模型 动力耦合 化学动力学 数值模拟 动态三维 含水介质 运移过程

文中以潍河下游的莱洲湾南岸地区为研究区 ,阐述了海咸水分布规律。针对海咸水运移过程中的水动力学特征和化学动力学特征 ,推导了水动力化学动力耦合的盐分运移对流弥散方程 ,水动力过程考虑了浓度变化对水流运动的影响 ,化学动力学过程考虑了含水介质表面吸附 (解吸 )作用对盐分运移的影响。采用改进的非线性特征有限元法 ,求解高浓度溶质运移三维模型。计算结果表明 ,该模型更真实地刻画了海咸水入侵系统。通过对海咸水入侵规律进行模拟 ,指出海咸水入侵的根本原因是过量开采地下淡水资源 ,要防止海咸水入侵 ,必须科学开采地下淡水资源。

In this paper, the south bank of Lai Chau Bay in the lower reaches of Weihe River is taken as the research area, and the distribution rules of brackish water are expounded. Based on the hydrodynamic characteristics and chemical kinetic characteristics during the process of seawater saltwater transport, the convection-dispersion equations of salt migration coupled with hydrodynamic chemical kinetics are deduced. The hydrodynamic processes take into account the influence of the concentration changes on the water flow. The chemical kinetic processes The effects of adsorption (desorption) on the surface of aqueous media on salt migration are considered. The improved nonlinear characteristic finite element method is used to solve the three-dimensional model of high concentration solute transport. The calculation results show that the model more accurately depicts the saltwater intrusion system. Through the simulation of the law of intrusion of seawater, it is pointed out that the fundamental reason of intrusion of seawater and saltwater is over-exploitation of underground freshwater resources. To prevent sea-salt water intrusion, underground freshwater resources must be scientifically exploited.