Land-atmosphere coupling-based method and system for flood forecast of minor watersheds

Abstract

The invention provides a land-atmosphere coupling-based method and a system for flood forecast of minor watersheds, which are used for solving the problem of low accuracy for the flood forecast of the minor watersheds. The method comprises the following steps: setting model parameters; inputting initial data; judging a runoff-generation manner through analyzing the initial data, calculating surface runoff if the runoff-generating manner is infiltration excess runoff, and taking the surface runoff as simulation runoff; calculating the infiltration amount of soil if the runoff-generating manner is saturation excess runoff, and calculating base runoff and subsurface runoff by using the soil infiltration amount; calculating to obtain the simulation runoff according to the base runoff and the subsurface runoff when the soil is unsaturated; and further calculating the surface runoff and calculating to obtain the simulation runoff according to the base runoff, the subsurface runoff and the surface runoff when the soil is saturated. The land-atmosphere coupling-based method and the system provided by the invention are suitable for calculating the simulation runoff of the minor watersheds, and the calculating result is more accurate through the combination of theory and practice, thus the land-atmosphere coupling-based method and the system are suitable for short-term or ultra-short-term runoff forecast and have high forecast accuracy.

Description

technical field [0001] The invention relates to hydrometeorology, in particular to a small watershed flood forecasting method and system based on land-atmosphere coupling. Background technique [0002] Hydrological forecast is a qualitative or quantitative forecast of the hydrological situation in a certain period of time in the future based on the previous and current hydrological and meteorological information. Hydrological forecasting is an important aspect of hydrology serving the economy and society, especially the forecasting of disastrous hydrological phenomena, and the short-term, medium-term and long-term forecasting of comprehensive utilization of large-scale water conservancy projects. Flood forecasting is a very important part of hydrological forecasting. There are many methods for flood forecasting. One of them is to forecast floods by predicting runoff. The currents of swamps and oceans. [0003] An important area in flood forecasting is that of small watersh...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a small watershed flood forecasting method and system based on land-air coupling to solve the problem of low flood forecasting accuracy in small watersheds

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