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.