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Potential evapotranspiration estimation method considering underlying surface condition change

A potential technology for evapotranspiration, applied in the field of satellite remote sensing applications, which can solve problems such as inability to meet applicability requirements

Inactive Publication Date: 2021-04-23
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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Problems solved by technology

Therefore, the currently most widely used FAO Penman-Monteith algorithm can neither meet the applicability requirements of different vegetation cover types (such as forest ecosystems with large climate spans, high canopy heights, and complex structures), nor can it meet the conditions of the underlying surface. Significant changes (such as the increase of vegetation leaf area index LAI, atmospheric CO 2 Concentration rise, etc.) affect the validity requirements of vegetation transpiration and potential evapotranspiration estimation accuracy

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  • Potential evapotranspiration estimation method considering underlying surface condition change
  • Potential evapotranspiration estimation method considering underlying surface condition change
  • Potential evapotranspiration estimation method considering underlying surface condition change

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Embodiment Construction

[0048]The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0049]Such asfigure 1 The potential evapoatization estimation method shown in consideration of the underwent surface condition changes, in the terrestrial table or the pixel (down-pad type can be forest, grass, farmland, wetlands, shrubs and naked soil, etc.) atmosphere Co2The concentration, leaf area index, vegetation coverage, and meteorological drive are input, and the potential evapogenation is finally estimated by estimating potential vents and potential naked soil evaporation, respectively.

[0050]The specific calculation process is as follows:

[0051]Step 1, data collection: collect the atmosphere CO on the research site or area image dimension2Concentration (Ca), Leaf area index (LAI), vegetation coverage (Fc) Time series of meteorological drive field data; meteorological drive data includes temperature, air pressure, relative humidity, downl...

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Abstract

The invention discloses a potential evapotranspiration estimation method considering underlying surface condition change. The method comprises the following steps: collecting pixel scale data of a research site or region; calculating the maximum blade stomatal conductance through the atmospheric CO2 concentration; combining the maximum leaf stomatal conductance with the leaf area index to calculate vegetation canopy conductance; calculating aerodynamic conductivity according to the near-surface wind speed and the canopy height; calculating vegetation available energy and bare soil available energy according to the available energy; and adding the vegetation potential transpiration amount and the bare soil potential transpiration amount to calculate the surface evapotranspiration amount. The method gets rid of hypothesis constraints of underlying surface conditions and vegetation canopy stomatal conductance invariance, and overcomes the applicability problem that an existing potential evapotranspiration algorithm is only suitable for limited surface coverage vegetation types; thus, a mathematical relation between the leaf maximum pore conductance and the atmospheric CO2 concentration under different ground cover vegetation types are established, and the process that the dynamic change of the atmospheric CO2 concentration affects the canopy pore conductance and potential evapotranspiration can be described reasonably.

Description

Technical field[0001]The present invention relates to a potential evapoatization estimation method, and more particularly to a potential evapoatization estimation method for considering the change of the lower surface condition. It belongs to the field of satellite remote sensing applications.Background technique[0002]Potential evaporate is referring to an ecosystem or a regional evaporation capability of the region under full water supply conditions. At the scope of meteorology and hydroxation, potentially evaporate is an important research content of surface water balance and energy balance. In practical applications, potentially evaporated estimates have been widely used in farmland irrigation management, crop demand water, drought monitoring, water resources effective development and utilization, etc. For global climate change, water resources evaluation, forest resource management It is of great significance to ecological security. Early potentially evaporated algorithms mainly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28G06F113/08G06F119/14
Inventor 张选泽张永强田静
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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