A Method for Determining the Main Causes of Evapotranspiration Changes and the Coupling Effects of Discriminant 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: 2019-12-06
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 really have a large effect on the parameters of the Budyko equation, but also affect the simulation of the parameters in the hydrothermal coupling balance equation. to uncertainty

Method used

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  • A Method for Determining the Main Causes of Evapotranspiration Changes and the Coupling Effects of Discriminant Factors
  • A Method for Determining the Main Causes of Evapotranspiration Changes and the Coupling Effects of Discriminant Factors
  • A Method for Determining the Main Causes of Evapotranspiration Changes and the Coupling Effects of Discriminant Factors

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Embodiment Construction

[0041] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0042] Such as figure 1 As shown, it is a flowchart of a method for determining the main cause of evapotranspiration change and the coupling effect between discriminant factors in the present invention, including the following steps:

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

[0044] (2) Divide the basic data into monthly values, according to the basin hydrological year divi...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/10
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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