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Calculation method for bare land rain day phreatic water evaporation

A calculation method and water surface evaporation technology, which is applied to the calculation field of phreatic evaporation on rainy days on bare land, can solve the problems that the phreatic evaporation calculation method for distinguishing between rainy days and non-rainy days has not yet been reported.

Pending Publication Date: 2020-04-03
安徽省(水利部淮河水利委员会)水利科学研究院(安徽省水利工程质量检测中心站)
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Problems solved by technology

[0004] At present, a lot of research has been carried out on the calculation method of phreatic evaporation. Most of the existing calculation methods consider rainfall as a meteorological element affecting phreatic evaporation, but the calculation method of phreatic evaporation that distinguishes between rainy days and non-rainy days has not yet been reported.

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  • Calculation method for bare land rain day phreatic water evaporation
  • Calculation method for bare land rain day phreatic water evaporation
  • Calculation method for bare land rain day phreatic water evaporation

Examples

Experimental program
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Effect test

Embodiment 1

[0050] The specific establishment process of the phreatic evaporation calculation model on a rainless day is as follows:

[0051] According to the data of daily phreatic evaporation and daily water surface evaporation in Shajiang black soil and yellow tidal soil from 1993 to 2015, the specific expressions of phreatic evaporation in rainless days for the two soils are as follows:

[0052] Sand ginger black soil:

[0053] Yellow tidal soil:

[0054] Among them, Eg is the phreatic evaporation intensity (mm), E 0 is the evaporation capacity of the atmosphere (mm), and H is the buried depth of the water (m). The values ​​of each statistical index in formula (11) are: MAE=0.52, RMSE=0.51, R 2 = 0.81. The value of each statistical index in formula (12) is MAE=0.42, RMSE=0.37, R 2 =0.89, the fitting effect is better.

Embodiment 2

[0056] The calculation method of phreatic evaporation reduction on rainy days is:

[0057] Δ=Eg 1 -Eg' (13);

[0058] According to formulas (11) and (12), the phreatic evaporation in rainy days of Shajiang black soil and yellow tidal soil from 1993 to 2015 was calculated, and the decrease of phreatic evaporation in rainy days was obtained by making a difference with the measured values.

Embodiment 3

[0060] The specific establishment process of the calculation model of phreatic evaporation reduction in rainy days is as follows:

[0061] As a graph of the relationship between phreatic evaporation reduction of Shajiang black soil and buried depth, rainfall level and rainfall duration, the results are shown in Figure 1 ~ Figure 3 . As a graph of the relationship between phreatic evaporation reduction of loess fluvo-aquic soil and buried depth, rainfall level and rainfall duration, the results are shown in Figure 4 ~ Figure 6 .

[0062] Depend on figure 1 It can be seen that the reduction of phreatic evaporation in Shajiang black soil increases with the increase of buried depth, and the increasing trend gradually slows down until it approaches zero. When the phreatic burial depth is 0.8m, the phreatic evaporation reduction is basically 0. Depend on figure 2 It can be seen that the reduction of phreatic evaporation in Shajiang black soil decreases with the increase of rai...

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Abstract

The invention relates to a calculation method of bare land rain day phreatic water evaporation. The calculation method comprises the following steps: establishing a rain-free day diving phreatic waterevaporation calculation model, further calculating a phreatic water evaporation reduction calculation model, and finally proposing a rain day phreatic water evaporation calculation model. The precision of the phreatic water evaporation calculation model established by distinguishing the rain day and the rain-free day is higher, and meanwhile, the influence of rainfall capacity and rainfall duration on phreatic water evaporation is revealed. The calculation method can improve the calculation precision of phreatic water evaporation, and provides technical support for researching the influence of rainfall on phreatic water evaporation.

Description

technical field [0001] The invention relates to a calculation method for phreatic evaporation on rainy days in bare land, and belongs to the technical field of water conservancy detection. Background technique [0002] In areas with shallow groundwater burial, groundwater and soil water change frequently. Accurate calculation of phreatic evaporation is important for research on crop water consumption mechanism and crop growth mechanism, crop irrigation system design, water balance analysis, groundwater resource assessment and soil secondary salinization. etc. are of great significance. [0003] At present, there are mainly two kinds of calculation methods for phreatic evaporation in bare land: empirical method and theoretical method. The empirical method mainly relies on a large number of observation experiments of phreatic evaporation under different groundwater depth conditions, and establishes empirical models through regression analysis, including Ye Shuiting formula, Sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F111/10
Inventor 王振龙许莹莹董国强范月刘猛胡永胜
Owner 安徽省(水利部淮河水利委员会)水利科学研究院(安徽省水利工程质量检测中心站)
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