Reservoir incoming water quantity early warning and forecasting method and system based on small and medium-sized basin flood forecasting

Abstract

The invention discloses a reservoir incoming water quantity early warning and forecasting method and system based on medium and small basin flood forecasting, and the method comprises the steps: carrying out the interpolation of rainfall data in space, organically combining the grid rainfall data with the site rainfall data, and carrying out the model rainfall calculation; then, converting the potential evapotranspiration of the soil into the total evapotranspiration of the watershed; constructing a runoff production method library, and performing runoff production calculation by adopting different runoff production methods according to different climate types; combining the time area relation unit line of the drainage basin with the confluence speed, and obtaining the confluence flow process through a convolution formula by means of the surface net rainfall; fitting river section characteristic parameters, performing river flood calculation; and processing non-standard rainfall process data into a standard time period for parameter calibration. According to the method, the spatial heterogeneity of underlying surface attributes such as terrain and vegetation soil in the drainage basin is fully considered, the rainstorm flood process of the medium and small drainage basins is well simulated, and reliable technical support is provided for early warning of the water inflow of the reservoir.

Description

technical field [0001] The invention relates to the technical field of early warning and forecasting of reservoirs, in particular to a method and system for early warning and forecasting of water inflow in reservoirs based on flood forecasting of small and medium watersheds. Background technique [0002] In the field of reservoir flood forecasting and early warning applications in small and medium-sized watersheds, reservoir production planning needs to understand future water regime changes, and flood control scheduling is more dependent on the accuracy of reservoir flood forecasting. [0003] At present, the early warning methods of reservoir inflow mainly use statistical induction, regression fitting and other methods. The forecast has certain reliability, but the description of the flood process in the reservoir is insufficient, and the early warning accuracy needs to be strengthened. [0004] With the rapid development of watershed hydrological models promoted by comput...

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Problems solved by technology

The model parameters have a certain physical meaning, which can be determined in combination with the analysis of watershed attributes. Considering the spatial heterogeneity of the rainfall runoff process in the watershed, the hydrological variables at any point and at any time in the watershed can be obtained. Forecasting and early warning provides a new approach, but its huge basic data requirements restrict the popularization and application of the model

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