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Evapotranspiration calculation method considering vegetation growth seasonal succession

A calculation method and evapotranspiration technology, which can be applied in calculation, data processing application, prediction, etc., can solve the problem of low calculation accuracy of evapotranspiration, and achieve the effect of strong engineering significance and improved accuracy.

Inactive Publication Date: 2018-09-04
HOHAI UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for calculating evapotranspiration considering the succession of vegetation growth seasons, which considers the quantitative relationship between actual evapotranspiration and season-vegetation-soil conditions, and solves the problem of low calculation accuracy of long-term scale evapotranspiration , thus providing a more reliable evaporation data basis for medium and long-term runoff forecasting

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  • Evapotranspiration calculation method considering vegetation growth seasonal succession

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Embodiment

[0051] There are 10 years of monthly historical hydrological data such as precipitation, soil moisture content, and watershed runoff depth in a small watershed in a certain place, as well as historical meteorological data such as temperature, relative humidity, wind speed, and solar radiation, as well as future data provided by numerical weather prediction products. Forecast data such as temperature, relative humidity, wind speed, and solar radiation year by month. Utilize the method of the present invention, the calculation process of the actual evapotranspiration month by month in the coming year of this watershed is:

[0052] S1, define the annual and monthly precipitation data series as P 1 ,P 2 ,...,P 12 , the data sequence of soil water content is W 1 ,W 2 ,...,W 12 , the runoff depth data sequence is R 1 , R 2 ,...,R 12 ;

[0053] S2. Calculate the actual evapotranspiration ET in the i-th month of each year according to the basin water balance formula i =P i ...

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Abstract

The present invention discloses an evapotranspiration calculation method considering vegetation growth seasonal succession which is used for medium-and-long-term run-off forecast evapotranspiration calculation. The method comprises the steps of: employing a river basin meteorology and hydrology to observe historical data, obtaining actual evaporation capacity data in each time period correspondingto different season changes in the river basin, and calculating the evapotranspiration reference value of in each time period to analyze a river basin evaporation season evolutionary rule and construct a quantitative functional relationship among the actual evapotranspiration reference crop evapotranspiration of the river basin and the season time. When the forecast is performed, the establishedfunctional relationship is employed to calculate the evapotranspiration reference value in a special season time period in the river basin so as to obtain the actual evapotranspiration of the corresponding season time period. The evapotranspiration calculation method considering vegetation growth seasonal succession can solve the problem of actual evapotranspiration calculation of the river basinin a medium-and-long-term scale and has a great engineering meaning.

Description

technical field [0001] The invention relates to the technical field of mid- and long-term runoff forecasting, in particular to an evapotranspiration calculation method considering vegetation growth season succession. Background technique [0002] Applying the hydrological model of the watershed is one of the effective ways to forecast the medium and long-term runoff. However, different from the feature that rainfall plays a dominant role and evaporation plays a secondary role in short-term flood forecasting, evaporation and rainfall play an equal role in medium- and long-term runoff forecasting. Long-term evapotranspiration is controlled by seasonal meteorological conditions, vegetation growth process, and underlying surface conditions; since there is no pan evaporation data within the foreseeable period, the evapotranspiration cannot be calculated using the water surface pan evaporation conversion method. Therefore, when constructing a hydrological model for mid- and long-...

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Application Information

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IPC IPC(8): G06Q10/04
CPCG06Q10/04
Inventor 李彬权梁忠民胡义明王军郦于杰唐甜甜肖章玲
Owner HOHAI UNIV
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