Soil water and evaporation ratio coupling simulation and mutual conversion method

A technology of mutual conversion and evaporation ratio, applied in the field of soil water measurement, to achieve the effect of excellent estimation accuracy

Active Publication Date: 2020-01-31
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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  • Abstract
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Problems solved by technology

In addition, most studies regard soil water as a process variable in the estimation of evaporation ratio, and few studies establish the coupling relationship between soil water-evaporation ratio and evaporation ratio-soil water

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  • Soil water and evaporation ratio coupling simulation and mutual conversion method
  • Soil water and evaporation ratio coupling simulation and mutual conversion method
  • Soil water and evaporation ratio coupling simulation and mutual conversion method

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Embodiment Construction

[0072] The specific technical scheme of the present invention will be explained in conjunction with the drawings.

[0073] In the case of the implementation of the present invention, the Southern Great Plains region of the United States in 2005 was taken as the research object, and the coupling simulation of soil water and evaporation ratio and the verification of mutual conversion technology were carried out according to figure 1 The specific verification process is:

[0074] Download the 2005 MODIS remote sensing image data of the Southern Great Plains of the United States, including land surface temperature data (MOD11A1), data required to calculate air temperature (MOD06_L2 and MOD07_L2), solar altitude data (MOD03), and normalized vegetation index data (MOD13A2) ). Obtained 2005 field observation data of the ratio of soil water to evaporation in the Southern Great Plains of the United States. Perform preprocessing operations on remote sensing images and measured data, and co...

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Abstract

The invention provides a soil water and evaporation ratio coupling simulation and mutual conversion method. The boundary of a temperature-vegetation index characteristic space is optimized, the soil water and the evaporation ratio share one set of parameters, and continuous retrieval of the model boundary is achieved, a soil water and evaporation ratio actual measurement data driving mode is adopted, an optimal parameter obtained by a soil water target function calibrated by a soil water actual measurement value is used to estimate the evaporation, and vice versa. The aim is to indicate that the optimal parameter obtained by calibrate the soil water actual measurement value or an optimal parameter obtained by calibrating the evaporation ratio actual measurement value can be used to estimate the evaporation ratio or the soil water without bias. The target functions for estimating the two parameters share the same set of optimal parameters. The technology can be used to realize couplingsimulation and mutual conversion of the soil water and evaporation ratio.

Description

Technical field [0001] The invention belongs to the technical field of soil water measurement, and specifically relates to a method for coupling simulation and mutual conversion between soil water and evaporation ratio. Background technique [0002] Soil water refers to the water remaining in the pores of the soil, and the evaporation ratio is defined as the ratio of the energy consumed by water evapotranspiration to the available energy on the ground. The ratio of soil water to evaporation is used as the storage item and consumption item of water respectively, and the measurement of the temporal and spatial coupling relationship between the two is crucial to the understanding of the water quantity and energy balance process. Traditional soil water measurement methods include drying weighing method and time domain reflectometry, etc. The determination of evaporation ratio includes lysimeter, Bowen ratio system and vorticity related system. Although the point measurement method c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17G01N21/31G06Q10/04
CPCG01N21/17G01N21/31G01N2021/1765G01N2021/178G01N2021/1789G01N2021/1793G01N2021/1795G01N2021/1797G06Q10/04
Inventor 朱文彬
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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