Groundwater Numerical Simulation Within A Large-Scale Domain

In North China, for lack of water resources, the large area funnel has been formed for the overdraft of ground water and it leads to many problems such as the ground sedimentation, the sea-water encroachment, the regional ecological degeneration and so on which have badly affected the sustainable development of the regional economy and the society. At present, the problem of ground water environment has been developed from point to surface, which has leads to the regional ground water environment disaster. So, in order to reasonably exploit, utilize and protect the ground water resources, it is important to study the ground water in North China within a large-scale domain.Based on fully realizing the evolvement of the groundwater system, connecting with the practical data and problems in Fu Yang River plain in North China, the supply of the ground water was discussed in this paper through the experiment and the initial level of the large-area ground water was deduced using the modified Residual Kriging(RK) which is modified with DEM. Finally this paper adopts the Galerkin finite element method to make numerical simulation and applies it in the study area.The main works are summarized as follows:In the first part, the regime and crisis of the water resource especially the groundwater resource was summarized. And the development of the groundwater numerical simulation technology has been introduced. The characterist and the limited of the traditional model was also summarized and the large-scale ground water numerical simulation was pointed out necessary.In the second part, aiming at the ground water funnel in the North China Plain, and from the combination of hydrology and soil-physics, the variety characteristic of the infiltration moisture movement was studied through the inside experiment, which makes prepare to properly determine the hydrogeologic parameters of the large-scale ground water numerical simulation and establish the reasonable groundwater models.In the third part, aiming at the initial condition of the groundwater numerical simulation, a Kriging method connected with GIS: the modified Residual Kriging(RK) was brought forward. This method deduced the initial flow field of the large-scale ground water using DEM as auxiliary information. Generally speaking, the deduced precision of the initial water level was improved at a great extent.In the fourth part, based on the foundation of the more accurate deduce of the initial water level, the Galerkin finite element method was adopted to put on the steady flow numerical simulation of the large-scale ground water. Through the identification and validate, the different parameters were adjusted and identified again and again, and finally, a relatively ideal flow field of fit was received.