Calculation method and system for non-uniform underlying surface evapotranspiration based on hot advection and application

Abstract

The invention discloses a calculation method and system for non-uniform underlying surface evapotranspiration based on hot advection and application, and relates to the field of crop cultivation, and the calculation method for non-uniform underlying surface evapotranspiration based on hot advection comprises the following steps: 1, building a surface energy balance calculation model; 2, establishing a hot advection calculation model; 3, acquiring the surface temperature by using the thermal infrared image of the unmanned aerial vehicle, and establishing a crop evapotranspiration calculation model; and 4, substituting the data in the step 1 and the step 2 into the step 3 to obtain the evapotranspiration of the crops, and analyzing the contribution rate of the climatic elements to the evapotranspiration of the crops. According to the technical scheme, the farmland surface temperature is inversed based on unmanned aerial vehicle (UAV) thermal infrared remote sensing, a farmland hot advection energy value is calculated by adopting an earth surface energy balance equation and a hot advection calculation model, and a hot advection item-based crop evapotranspiration model calculation method is deduced by combining a thermal infrared-based crop evapotranspiration model with the thermal advection calculation model.

Description

technical field [0001] The disclosure of the present invention relates to the field of crop cultivation, in particular to a calculation method, system and application of evapotranspiration from non-uniform underlying surfaces based on thermal advection. Background technique [0002] Surface energy balance is a key link in the energy process of the climate system. Once the surface energy becomes heterogeneous, heat advection will occur. In-depth research on energy exchange processes such as thermal advection will help to further understand the regional energy and material cycles of farmland crops and the process of field microclimate changes, which is of great significance in agricultural production research. [0003] At the end of the 1980s, it was found that the surface energy observed by field experiments generally has a significant imbalance. Zhong Lei et al. (2006) found that each component of the energy balance in the Quzong area and the ground heating field have obvio...

AI Technical Summary

Problems solved by technology

[0006] Most of them are supported by remote sensing satellite data, which have a high scale and a large range, and cannot calculate and analyze thermal advection changes in small areas of farmland well;

[0007] Remote sensing satellites blur the impact of different energy exchanges and thermal advection at the field scale, which limits the scope and scale of research;

[0008] There are various downscaling methods for remote sensing images, and there is a lack of unified calculation specifications. Therefore, how to obtain high-resolution and lower-scale remote sensing data and establish related calculation models has become the key to the study of thermal advection energy in a small area of ​​farmland.

Images