Method for determining evapotranspiration change main cause and judging coupling effects among factors

A technology of evapotranspiration and action, applied in the application field of hydrology and water resources, can solve the problems of simulation uncertainty of parameters, and achieve the effect of solving the analysis error.

Active Publication Date: 2018-03-20
HOHAI UNIV
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Problems solved by technology

These factors intersect and interact with each other, and only considering the direct connection of several factors to the parameters may not only ignore the variables that rea

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  • Method for determining evapotranspiration change main cause and judging coupling effects among factors
  • Method for determining evapotranspiration change main cause and judging coupling effects among factors
  • Method for determining evapotranspiration change main cause and judging coupling effects among factors

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[0041] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The following embodiments described with reference to the accompanying drawings are exemplary, and are only used to explain the present invention, and cannot be construed as limiting the present invention.

[0042] Such as figure 1 Shown is a flow chart of a method for determining the main cause of evapotranspiration changes and the coupling between the discriminating factors of the present invention, including the following steps:

[0043] (1) Basic data collection: collect hydrometeorological data (precipitation, temperature, sunshine hours, relative humidity, average wind speed) from meteorological stations in the basin and various spatial data: underlying surface conditions, soil characteristics, and vegetation coverage in the basin Rate, etc. and preprocess.

[0044] (2) Divide the basic data into monthly values, according to th...

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Abstract

The invention discloses a method for determining an evapotranspiration change main cause and judging coupling effects among factors. The method comprises the steps that multiple influence factors (including drainage basin underlying surface characteristics, climatic seasonality characteristics and social economic indexes) which influence the actual evapotranspiration change are collected, the actual evapotranspiration amount of the drainage basin is calculated based on a Budyko hydrothermal coupling balance equation, and the drainage basin is subjected to evapotranspiration climate sensibilitypartition by using a rotation experience orthogonal function (REOF); various factors which influence the evapotranspiration change of each area are counted and analyzed on the basis of the partition,a model is established by using a multielement self-adaptive regression spline (MARS) method, accordingly, an uppermost influence factor is searched for from multiple factors, and the scientific basis is provided for the scientific research and production work such as flood prevention and drought resistance.

Description

technical field [0001] The invention relates to a method for determining the main cause of evapotranspiration change and the coupling effect between discriminant factors, and belongs to the technical field of hydrology and water resources application. Background technique [0002] In the process of climate change, the change of actual evapotranspiration is a very important indicator. Actual evapotranspiration not only plays an important role in the energy budget of the land-atmosphere system, but also plays an important role in the calculation of water balance. As a hydrological variable linking the energy balance system and the water balance system, analyzing the change of actual evapotranspiration plays a very important role in the study of climate change. [0003] In a large watershed, there are many factors that affect actual evapotranspiration and have certain regional differences. Based on previous studies, these factors can be roughly divided into four categories: (1...

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Application Information

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IPC IPC(8): G06F19/00
CPCG16Z99/00Y02A10/40Y02A20/152
Inventor 邢万秋王卫光姚冠泽丁一民董青郑佳重
Owner HOHAI UNIV
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