Study On Anisotropic Seawater Intrusion Model

The groundwater environment system of the costal zone is a complicated system which includes the freshwater environment, the tide environment and the salt-fresh water environment system. In recent years, due to more and more human activity setting foot in coastal zone, the freshwater demand for local resident has been increasing rapidly, and local groundwater is theirs most important water resource for production and life. However, according to the lack ness of understanding and effective control for groundwater, overexploitation happed again and again, which had lead to a series of geological hazards and environment problems. Seawater intrusion just is one of the most serious environmental geological hazards. Research on groundwater environment system of the costal zone especially on Seawater intrusion has became a pop topic in the present academe.Based on the predecessor's studies, a new anisotropic seawater intrusion model was established and resolved. In such model make dispersive coefficient and scale-dependent dispersion communicated systematically by fractal theory, which allow the aquifer is anisotropic. At last, a case is given, which confirm the validity and rationality of such theory. The major contents are as follows:(l)Mechanism of seawater intrusion is studied by analyzing the basic characteristic of groundwater in costal zone. Also it is point that fractal can be found in groundwater solute transport based on fractal theory. At last, an approximate formula of that be used to calculated dispersive coefficient is introduced, which make ready for the further model calculate.(2)Relationship between the sea level fluctuations and seepage lines of groundwater water is analysed, further to determine the seawater intrusion range in groundwater, then a one-dimensional and one-dimensional dispersion seawater intrusion model is established and resolved.(3)An one-dimensional and two-dimensional dispersion seawater intrusion model is established. After coordinate conversion for dispersive coefficient, the analytical solutions of those models are calculated by means of mathematical physical method.(4)Check the validity of seawater intrusion model in this paper combining with the engineering example.