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Flood detention basin system, the establishment of two-dimensional
+ G} l Xi + g =. (2) + gh Lu + g_0 (38th8xh8y) 'av. L, a flood of 34 * the establishment of two-dimensional flood routing system, 2o02, No. 6, where: h is water depth, Z is water level, qx, q are x, y direction of the unit discharge, n the roughness coefficient, g is acceleration due to gravity. 3.2 Treatment of the problem (1) border issues. Boundary can be divided into two kinds of open boundary conditions and closed borders. Open boundary: the water process, the process flow boundary conditions; recession,[link widoczny dla zalogowanych], there are two boundary conditions of the grid, one given at the process,[link widoczny dla zalogowanych], and the other is to give water level in the calculation based on the actual case. Closed borders: the closed border, water power factor method to the partial derivatives to 0, ie = edn (2) dry bed treatment. No flow for the water area of dry river bed, in need of special treatment. At present,[link widoczny dla zalogowanych], the more reasonable approach is to use moving boundary method, the computational domain to determine the areas without water and the boundaries of the simulation, but the program compiled the more complex and difficult process. In the actual process, the general simplified approximated by \4 shows the system of inquiry based on the establishment of 4.1 repository river network database includes: Name of mouth, bottom high, width, control conditions, the conditions and basis of calculation, the boundary flow of the process, the process of the lower boundary tidal, river classification Figure, the cross section of the terrain roughness. 4.2 Dynamic evolution of the dynamic evolution of the system, including water level,[link widoczny dla zalogowanych], water depth, flow rate and the dynamic evolution of disaster losses can be calculated within the flood in the whole process of the evolution of hourly simulated through dynamic graphics, very image, true to life. At the same time, the system also has the following features: Display the dynamic evolution of the flood at any one time graphics; shows the evolution of any location at any one time attribute information; show any time evolution of the flood detention basin area, storage capacity , losses, submerged villages, population information. 4.3 Statistical Analysis System in the flood routing process, each grid can do, every time a detention basin water level curve, time curve of a storage time of a flooded area curve, the time of a loss of curve; can query any water grid time, maximum depth, maximum loss and other information, for the village dedicated to the statistics, and village location on the map display; all or partition can also choose the form of two flooded area, storage volume, submerged population and flooded areas and other information shown on the map. 4.4 Interactive Query query system: click on a known location on the map, and select the location of the known water level, click on the map the location of interest, you can get the time of the location of the water level, water depth, topography and other information . Arbitrary grid query: query graph can be anywhere on the grid belongs to all the basic position information and risk information, including location,[link widoczny dla zalogowanych], topography, socioeconomic, and maximum depth, maximum loss and other information.
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