Atmosphere, land surface and hydrology bidirectional coupling method

Abstract

The invention relates to an atmosphere, land surface and hydrology bidirectional coupling method which comprises the following steps: step 1, improving runoff production calculation on the basis of basin water storage capacity discretization; 2, determining a coupling scale, and processing topographic data; 3, determining a coupling variable and formulating a bidirectional feedback mechanism; 4, carrying out confluence calculation and flood forecasting. According to the method, the simulation of the land-gas coupling system on the water circulation process is perfected, the precision of land-gas coupling flood forecasting is improved, and reliable technical support is provided for flood disaster prevention of the drainage basin.

Description

Technical field [0001] The invention relates to a two-way coupling method of atmosphere, land surface and hydrology, which belongs to the field of flood forecasting, and is mainly used for flood forecasting and early warning by meteorological and water conservancy departments. Background technique [0002] Flood forecasting driven by "falling rain" has a short forecast period and often cannot meet the flood control needs of small and medium-sized basins with short confluence times. The use of forecast rainfall-driven hydrological model to carry out flood forecasting can effectively extend the forecast period, especially the application of numerical rainfall forecasting, which makes the setting of forecast period more flexible. However, under the unidirectional coupling of numerical atmospheric model and hydrological model, numerical rainfall forecast The accuracy is low, and it is difficult to meet the requirements of flood forecasting in small and medium-sized river basins. As a...

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Problems solved by technology

The real water cycle process should be accompanied by energy cycle, and when the numerical atmospheric model forms rainfall, the land surface should feed back ground evaporation, plant transpiration, radiation is transmitted from the atmosphere to the land surface, and the land surface should also feed back a certain amount of radiation to the atmosphere , in general, the one-way coupling fails to accurately describe the water cycle process, so it is easy to cause the forecast rainfall to be distorted

[0004] The two-way coupling is closer to the real water cycle process, but due to the limitations of various observation data, a reliable coupling model has not been formed. Most of the two-way coupling models are conditionally constructed for the specific situation of a certain area data. Lack of universality, difficult to promote

In addition, the current land-atmosphere coupling is mostly the coupling of the numerical atmospheric model and the land surface model, and there are few studies on the two-way coupling of the numerical atmospheric model, the land surface model and the hydrological model.

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