Method for analyzing evapotranspiration influence factors and establishing multiple regression model

Abstract

The invention discloses a method for analyzing evapotranspiration influence factors and establishing a multiple regression model. The method comprises the following steps: collecting basin meteorological data, remote sensing data, basin underlying surface data, population data, vegetation coverage rate data and the like; inverting the surface temperature based on a porcupine single-window algorithm, and estimating the basin instantaneous evapotranspiration based on an SEBAL model according to an inversion result; dividing watershed features by adopting normalized vegetation indexes, and partitioning the watershed; on the basis of watershed zoning, performing sensitivity analysis, correlation analysis and t inspection on the evapotranspiration amount of the watershed and the influence factors of the evapotranspiration amount, and screening out main influence factors capable of reflecting the evapotranspiration characteristics of the watershed; establishing a multiple regression model for the basin evapotranspiration and the influence factors thereof; and gradually adjusting the constructed model by adopting an AIC information criterion until an optimal multiple regression model is obtained.

Description

technical field [0001] The invention relates to a method for analyzing factors affecting evapotranspiration and establishing a multiple regression model, which belongs to the technical field of remote sensing applications. Background technique [0002] Evapotranspiration (ET) is not only an important link in the surface water heat transfer process, but also one of the key components of the water cycle. In the global energy balance, the energy consumed by evapotranspiration accounts for about 60% of the net radiant energy on the earth's surface, and this proportion is greater in arid regions, and the energy transfer reacts on the global water cycle through evapotranspiration. Therefore, evapotranspiration is Emphasis in hydrology and water resources, climate, and agricultural research. [0003] Scholars at home and abroad have discussed evapotranspiration from multiple perspectives such as climate, environmental factors, and regionality. From the perspective of meteorology a...

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Problems solved by technology

There are differences in the sensitivity of evapotranspiration to each influencing factor

Although many scholars at home and abroad have studied and discussed the response relationship between evapotranspiration and its influencing factors from the perspective of time and space, the conclusions drawn are not completely consistent, especially when sorting the sensitivity of meteorological factors. This difference is mainly due to land cover types, which shows that when studying the response relationship between evapotranspiration and its influencing factors, the control of variables such as climate and environment is somewhat one-sided.

Therefore, there are differences in the diversity of factors influencing evapotranspiration and the interaction among factors in different subregions of watersheds. Further research is needed to systematically address the relationship between different subdivisions of watersheds on evapotranspiration and its influencing factors.

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