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In this paper, based on a web page to determine similarity is proposed which is based on semantic web similarity judgments. First on the web page of text extraction, is text segmentation, also taking stop words to go out, Similarity judgments for the Web page provides a basis. Then based on Vector Space Model using TF-IDF method similar to the Chinese website text judgment, In the process of judging,...
A two-dimensional mathematical model for the simulation of tidal current for combined dilution and diffusion of effluent sewage was proposed. The dilution and diffusion behavior of near field and far field were studied. An orthogonal curvilinear coordinate system is used, greatly increasing model efficiency in treating irregularly shaped coastlines and in meeting requirements for high resolution at...
Yangtze River is the biggest river in China, the quantity of freshwater flowing in ocean is very huge. And it is middling tidal estuary that is affected by tidal current obviously. This area is a very complex system, which has three-order branches and four outlets to the East Sea. The estuary is influenced by tide and freshwater, And saltwater intrusion is complex either. Therefore, studying on the...
A finite element model for depth-averaged hydrodynamics, sediment and contaminant transport (HSCTM-2D) is used to simulate the tidal current field and suspended sediment field of Estuary of Pearl River. The cohesive sediment transport model takes into account the shear stress in erosion algorithm and deposition algorithm adequately. Using the dry density, sediment on the bed can be divided into two...
It is based on the calculating results of the flow field of the Kuncheng Lake to simulate the diffusion of the chemical oxygen demand (COD) in the lake. And utilize the observed data and the calculating results of the water quality concentration field of the lake to achieve the water environmental capacity in the dry season. From the results, it is shown that the velocity of the lake is small and...
There are complicated underwater topographies in the offshore sea area of north Jiangsu, including the middle radial sand ridges and northern Haizhou bay underwater shoal. So there form special marine dynamic conditions and typical shoal wetland ecosystem. Previous main researches of these sea areas were focused in the forms of morphogenesis and the characteristic of conformation of sand ridges. Few...
There are lots of lakes with shallow depth and slow water velocity all over the Suzhou city. The aquatic environment of these lakes become more and more worse because of the development of urbanization. In order to predict the lake eutrophication, it is necessary to know the nutrients distribution such as phosphorus and nitrogen pollution. It takes the depth- averaged two dimensional water quality...
Based on the general relationship described by Cheng between the drag coefficient and the Reynolds number of a particle, a new relationship between the Reynolds number and a dimensionless particle parameter is proposed. Using a trial-and-error procedure to minimize errors, the coefficients were determined and a formula was developed for predicting the settling velocity of natural sediment particles...
In this paper, a composite explicit nonlinear dispersion relation is presented with reference to Stokes 2nd order dispersion relation and the empirical relation of Hedges. The explicit dispersion relation has such advantages that it can smoothly match the Stokes relation in deep and intermediate water and Hedgs’s relation in shallow water. As an explicit formula, it separates the nonlinear term from...
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