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A surface soil water content-coupled regional scale maximum pore conductance calculation method

A technology of soil water content and surface soil, which is applied in the field of remote sensing monitoring of water resources and eco-hydrology, to achieve the effects of convenient calculation of time and space scales, strong mechanism and improved scientificity

Active Publication Date: 2021-06-11
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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Problems solved by technology

[0014] Aiming at the technical bottleneck of calculating the maximum stomatal conductance in the process of calculating regional-scale evapotranspiration, the present invention provides a calculation method for calculating the regional-scale maximum stomatal conductance coupled with surface soil water content, which solves the problem of obtaining evapotranspiration calculation based on remote sensing monitoring technology Calculation problem of regional scale maximum stomatal conductance parameter in the process

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  • A surface soil water content-coupled regional scale maximum pore conductance calculation method
  • A surface soil water content-coupled regional scale maximum pore conductance calculation method
  • A surface soil water content-coupled regional scale maximum pore conductance calculation method

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Embodiment Construction

[0062] In order to make the object, technical solution and advantages of the present invention clearer, the following examples are listed according to the accompanying drawings, and the present invention is further described in detail.

[0063] Such as figure 1 As shown, step a, according to the location of the study area, collect the data of various influencing factors related to the change of soil moisture content, and convert each influencing factor into daily data with a spatial resolution of 1km;

[0064] Based on the soil moisture observation data in Hebei Province, the surface soil moisture content of the whole province was retrieved, and the selected influencing factors of soil moisture content change included rainfall, potential evapotranspiration (E p ), Modified Vertical Drought Index (MPDI), Normalized Difference Vegetation Index (NDVI) and Surface Elevation (DEM);

[0065] Collect the observation data of rainfall stations in Hebei Province in 2018, and use the Ar...

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Abstract

The invention discloses a surface soil water content-coupled regional scale maximum pore conductance calculation method, which comprises the following steps: screening influence factors of surface soil water content, and obtaining raster data of each influence factor on a regional scale; based on the surface soil moisture content monitoring data, constructing a surface soil moisture content neural network simulation model to obtain a space-time continuous surface soil moisture content product; analyzing the relationship between the minimum pore resistance of the canopy and the canopy resistance, and constructing the association between the canopy resistance and the surface resistance; obtaining the canopy resistance and the minimum canopy pore resistance based on calculation of the surface resistance, and obtaining the maximum pore conductance of the regional scale through the inverse relation between the pore resistance and the pore conductance. The regional scale maximum pore conductance calculation method coupling the surface soil water content and the evapotranspiration process is achieved, dynamic coupling of the soil water content process and the evapotranspiration process on the regional scale is achieved, and the inversion mechanism of surface evapotranspiration is strengthened.

Description

technical field [0001] The invention relates to the technical fields of remote sensing monitoring of water resources and ecohydrology, in particular to a method for calculating the maximum stomatal conductance at a regional scale coupled with surface soil water content. Background technique [0002] Surface evapotranspiration is an important part of the water cycle process, and obtaining large-scale evapotranspiration data is of great significance for the realization of refined management of water resources. The PML (Penman-Monteith-Leuning) model is one of the mainstream methods for evapotranspiration inversion based on remote sensing data. This model introduces the surface conductance based on the Penman-Monteith model, and establishes the relationship between the surface conductance and the LAI (LeafArea Index) The relationship between them is used to realize the inversion of surface evapotranspiration. The research of Leuning et al. (Leuning et al., 2008) showed that th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/27G06N3/02
CPCG06F30/27G06N3/02
Inventor 段浩徐浩玮文铭王镕贾玲郝震曹引赵红莉仇亚琴蒋云钟潘世兵韩昆冶运涛刘海滢
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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