Calculation method for underground water critical depth on condition of phreatic evaporation

A critical depth, calculation method technology, applied in calculation, special data processing applications, instruments, etc., can solve problems that are difficult to avoid, do not consider soil characteristics, hydrogeological conditions and groundwater conditions, achieve convenient calculation, and is conducive to engineering Use with researchers, the effect of addressing gaps and value uncertainty

Active Publication Date: 2015-10-28
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0006] It is difficult to avoid the influence of soil spatiotemporal heterogeneity, topography and experimental conditions on the determination of groundwater critical depth by field investigation method and formula method. The current calculation method does not consider variables such as soil properties, hydrogeological conditions and groundwater conditions.

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  • Calculation method for underground water critical depth on condition of phreatic evaporation
  • Calculation method for underground water critical depth on condition of phreatic evaporation
  • Calculation method for underground water critical depth on condition of phreatic evaporation

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Embodiment 1

[0057] Embodiment 1: The calculation method proposed by the present invention is used to calculate the critical depth of groundwater under phreatic evaporation conditions in a certain area of ​​Shijiazhuang City, Hebei Province.

[0058] The calculated soil is selected from a certain area in Shijiazhuang City, Hebei Province. The upper soil closely related to evaporation is the research object. The soil bulk density is 1.387g / cm 3 , θ s , θ r ,α,n,K s , m and l are 0.4243cm 3 / cm 3 , 0.0598cm 3 / cm 3 , 0.00827cm -1 , 4.25243, 1.08864cm / d, 0.76484 and 0.5.

[0059] The area of ​​the study area is small (less than 10000m 2 ), the calculation period is the annual average critical depth. The annual average evaporation is 1677.8mm, E y Should be 0.45967cm / d, the calculated surface soil evaporation intensity is 0.045967cm / d, and the absolute value of soil negative pressure at the surface is 15000cm. Combined formulas (1), (2) and (3), based on Fortran language compilation...

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Abstract

A calculation method for underground water critical depth on a condition of phreatic evaporation belongs to a calculation method for underground water critical depth. The calculation method is on the basis of Mualem-Van Genuchten soil moisture characteristic curve equation and a one-dimensional homogeneous soil steady state evaporation model of Gardner. The calculation method comprises the following steps of: 1, determining the area of a study region and a calculation time interval; 2, determining parameters of the Mualem-Van Genuchten soil moisture characteristic curve equation of the study region; 3, determining calculation surface soil evaporation intensity of the study region and a soil negative pressure absolute value of an earth surface; and 4, calculating the underground water critical depth of the study region on the condition of phreatic evaporation. The calculation method for the underground water critical depth has the advantages that the underground water critical depth can be rapidly and effectively calculated, the calculation result is contributed to a favorable reference value and beneficial for engineering research staff to use, the technical problems of the blank in the calculation method for the underground water critical depth and value uncertainty are solved, and the calculation method can be applicable for different places and different soil types.

Description

technical field [0001] The invention relates to a calculation method for the critical depth of groundwater, in particular to a calculation method for the critical depth of groundwater under the condition of submerged evaporation. Background technique [0002] The phreatic evaporation problem has important research significance for the prevention and control of soil salinization. The current phreatic evaporation models for bare land can be divided into empirical models and mechanistic models. Empirical models usually assume that the phreatic evaporation intensity is related to factors such as water surface evaporation intensity and groundwater depth, and use different types of mathematical formulas to fit the experimental data, including the exponential formula of Ye Shuiting et al., the hyperbolic empirical formula of Shen Lichang, Lei Zhi Dong et al.'s semi-empirical-semi-mechanistic model, logarithmic formula and Averyanov formula, etc. Mechanistic models are mainly based...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 杨德军卞正富雷少刚熊集兵
Owner CHINA UNIV OF MINING & TECH
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