Time-varying gain model-based water, energy and carbon coupling numerical simulation method and system

Abstract

The invention provides a time-varying gain model-based water, energy and carbon coupling numerical simulation method and system. The method comprises the steps of S1, receiving meteorological data and soil vegetation underlying surface type data; s2, initializing the average canopy temperature and the surface temperature in a preset first time period to obtain the net radiation flux of the canopy and the surface; s3, constructing a photosynthesis / stomatal conductance coupling model, and performing vegetation dynamic carbon assimilation simulation; s4, obtaining evapotranspiration parts based on the double-source evapotranspiration model; s5, inputting the evapotranspiration parts, intercepted precipitation and the soil moisture content in the first time period into a time-varying gain runoff production model, and iterating to obtain the soil moisture content; s6, obtaining a canopy, soil latent heat flux, a canopy, soil sensible heat flux and soil heat flux, constructing an energy balance model, and obtaining the average temperature of the canopy. According to the method, the calculation balance of water quantity, energy and carbon flux in a certain period of time can be realized, so that the calculation deviation caused by energy and material imbalance is reduced.

Description

technical field [0001] The invention relates to the intersection field of hydrology and ecology, specifically, a water, energy and carbon coupling numerical simulation method based on a time-varying gain model. Background technique [0002] Studying the coupling process of water, energy, and carbon in terrestrial water cycle, surface energy balance, and ecosystem carbon cycle is an important basis for accurately understanding the coupling mechanism characteristics of terrestrial ecohydrology under changing environments, and realizing the management of water and carbon resources in the basin. Integrated management, efficient crop irrigation, and ecosystem stability play an important role. [0003] Commonly used methods for terrestrial water, energy, and carbon coupling research include experimental observation methods based on stable isotope technology, eddy correlation technology, tree trunk sap flow technology, and numerical simulation based on remote sensing inversion prod...

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Problems solved by technology

[0004] In the existing technology, on the one hand, the traditional hydrological model generally focuses on the water cycle process of the basin, and the description of the ecological process is often insufficient. At the same time, the ecological model is also lacking in the description of the hydrological process. This kind of model description that ignores the interaction mechanism of vegetation and hydrology, The coupling of eco-hydrology is a loose coupling relationship. When this loose coupling model is used for the simulation of eco-hydrology elements and characteristics research, it will directly lead to the deviation of eco-hydrology water, energy, and carbon simulation; on the other hand, most of these models are based on their respective The field is the entry point, and the balance mechanism of water-energy-carbon in the evapotranspiration process is not fully considered, which leads to the influence of the accuracy of calculation due to the imbalance of matter and energy

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