A rapidly and accurately calculating method of the Three Gorges Reservoir dynamic storage

The Three Gorges Reservoir is a typical channel reservoir in the Changjiang River, China. Dynamic storage can preferably reflect the true situation of water storage for the discharge flowing into reservoir, so it's one of the important parameters of the water balance's calculation, runoff forecast and reservoir operation for a channel reservoir. Combining the GIS technology with the hydrodynamic method, this paper proposed a rapidly and accurately calculating method of the channel reservoir's dynamic storage. And the method has been successfully applied in the Three Gorges Reservoir real-time operation. As the reservoir watercourse's DEM data is usually in a greatly mass and redundancy, the block-based processing, run-length encoding raster data compression method and multi-bands integration method were employed to manage the parameters. The efficiency of the spatial interpolation method's calculation has been evidently improved and rapid calculations of dynamic storage have been realized. Based on the method, a software system of dynamic storage calculations was developed and used to calculate the dynamic storages of the Three Gorges Reservoir. The calculation speed is quick and the calculated results' errors are small, which indicates that the method is valid and feasible.