Coupling method of lumped hydrological model and two-dimensional hydrodynamic model

Abstract

The invention provides a coupling method of a lumped hydrological model and a two-dimensional hydrodynamic model, 1, data processing: acquiring and proces that basic data required by the lumped hydrological model and the two-dimensional hydrodynamic model, wherein the computing grid of the hydrodynamic model and the grid data of the land use raster are adopt with the grid data of the DEM raster data of the elevation data, and the grid data of the DEM raster data of the land use raster are used with the DEM raster data; 2, constructing a hydrological model and calculating: construct a lumped hydrological model based on basic data; 3, a coupling method: adopting a downscaling method to make that obtain runoff process consistent with the temporal and spatial scales of the hydrodynamic model;4, constructing and calculating that hydrodynamic model: reading the downscaled runoff grid data into the hydrodynamic model for calculation, and obtaining the spatial distribution of flood eigenvalue. The invention has relatively low data requirements and can be applied to regions with little or no data. The coupling part is simple and reduces the errors and uncertainties in numerical computation.

Description

technical field [0001] The invention relates to the technical field of coupling calculation of a hydrological model and a hydrodynamic model, in particular to a coupling method of a lumped hydrological model and a two-dimensional hydrodynamic model. Background technique [0002] The lumped hydrological model is an important tool in the current study of flood forecasting in river basins. The mathematical equations used in the lumped hydrological model usually do not consider the spatial differences of the characteristics of the underlying surface of the basin, the hydrological process, and the input variables of the model. Some hydrological processes in the model are usually described by some simplified hydraulic formulas or empirical formulas , so the lumped watershed hydrological model belongs to the category of conceptual models. The lumped hydrological model takes the system as the research object. Although the physical meaning of some parameters is not clear and often h...

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Problems solved by technology

but cannot be coupled with hydrodynamic models at the basin-wide scale

The two-way coupling method is based on the simultaneous calculation of the hydrological model and the hydrodynamic model, and exchanges boundary values ​​at each time step; its disadvantage is that the calculation process of the hydrodynamic model is relatively complicated, and the time step is small, which is different from that of the hydrological model. There are differences in time and space scales, and special treatment is required in the coupling process; at the same time, when calculating large-scale watersheds, due to the low efficiency of hydrodynamic models for fine calculations, there are limitations in practical applications

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