滨海地表水和地下水耦合模型的建立及应用

发布时间：2018-03-12 11:39

本文选题：地表水与地下水　切入点：POM　出处：《大连理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：海岸带是大陆和海洋的过渡地带,海岸地下水参与了如海岸侵蚀、盐水入侵、水质污染等水体交互运动。近年来,许多国内外学者已经在地表水和地下水相互作用的问题上做了一些研究,这一领域已逐渐成为新的研究的热点。目前的研究中,数值模拟法建立耦合模型是主要研究方法,地表水一般假设为一维河道和二维坡面流,在海岸带区域研究较少,而且所建立模型大多限于实验验证,对实际情况的应用计算很少。本文应用数值模拟方法,尝试将地表水模型与地下水模型耦合,应用经典的泻湖试验进行耦合模型的验证,并将其应用于计算实例。所建立模型将来可以用来研究滨海地区海水入侵、污染物运移等问题。论文主要研究内容有：(1)选取三维有限差分地表水计算模型POM与三维有限元地下水计算模型SUTRA,在两个模型的海岸交界处进行处理,以水量交换作为两个模型的耦合关系,建立海岸带地表水和地下水计算的三维耦合数值模型。(2)模拟Ebrahimi泻湖实验用于耦合模型的模型验证,通过对比观测点的水位和速度模拟值和实测数据,验证模型计算的有效性。在实验基础上加入溶质运移的计算,分析了沙坝内盐度侵入变化规律。(3)将模型应用于实例计算,建立六股河地区的近似模型,以潮汐为海洋动力条件,分别探讨了不同的渗透系数参数和有无降雨条件对地下水运动的影响。
[Abstract]:The coastal zone is a transitional zone between the mainland and the ocean. Coastal groundwater is involved in the interactive movement of water bodies such as coastal erosion, salt water intrusion, water pollution and so on. Many scholars at home and abroad have done some research on the interaction between surface water and groundwater, and this field has gradually become a new research hotspot. Surface water is generally assumed to be one dimensional channel and two dimensional slope flow, but there are few studies in the coastal zone domain, and most of the established models are limited to experimental verification, and the application of calculation to the actual situation is very few. In this paper, numerical simulation method is applied. The surface water model is coupled with the groundwater model, the classical lagoon test is used to verify the coupling model, and the model is applied to the calculation example. The established model can be used to study the seawater intrusion in coastal areas in the future. The main contents of this paper are: 1) selecting 3D finite-difference surface water calculation model POM and three-dimensional finite element groundwater calculation model Sutra to deal with the coastal boundary of the two models. Taking the water exchange as the coupling relation between the two models, a three-dimensional coupled numerical model for the calculation of surface water and groundwater in the coastal zone is established. The Ebrahimi lagoon experiment is used to validate the coupled model. The validity of the model is verified by comparing the simulated values of water level and velocity and the measured data. The calculation of solute migration is added on the experimental basis, and the law of salinity invasion in sand dam is analyzed. The approximate model of Liugu River area is established. The influence of different parameters of permeability coefficient and rainfall on the groundwater movement is discussed with the tide as the marine dynamic condition.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P731.2

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