Method for calculating critical burying depth of rainfall infiltration recharged groundwater

A calculation method and groundwater technology, applied in the direction of calculation, special data processing applications, instruments, etc., can solve problems with subjective preferences, difficult to popularize and apply, lack of mechanism of action and physical process, etc., to achieve clear physical process and mechanism of action, The effect of reliable theory and technical support

Inactive Publication Date: 2015-11-04
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is simple and intuitive, but it is difficult to popularize and apply because of the lack of mechanism of action and physical process, and subjective preference

Method used

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  • Method for calculating critical burying depth of rainfall infiltration recharged groundwater
  • Method for calculating critical burying depth of rainfall infiltration recharged groundwater
  • Method for calculating critical burying depth of rainfall infiltration recharged groundwater

Examples

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Embodiment 1

[0052] This embodiment is a method for calculating the critical buried depth of groundwater recharged by rainfall infiltration.

[0053] According to the principle of water infiltration and the critical definition of groundwater recharge, the position where the infiltration process is completed and the wetting front disappears is the critical buried depth for infiltration and groundwater recharge. The actual infiltration recharge groundwater table should be above the critical buried depth. Such as figure 1 As shown, the maximum infiltration depth that infiltration may reach is the critical depth. When the phreatic depth is greater than the maximum infiltration depth, the infiltration will stop if it cannot reach the aquifer, and the groundwater recharge cannot be realized. Any groundwater depth within the maximum depth can complete infiltration recharge. The two most important physical quantities for determining the critical depth are the water supply (rainfall + return wat...

Embodiment 2

[0097] This embodiment is an improvement of the first embodiment, and it is a refinement of the first embodiment on the "soil water potential of the wetting front". The empirical formula for calculating the "soil water potential of the wetting front" in the "steps for calculating the moving velocity of the wetting front in the layer by hydraulic conduction" described in this embodiment is:

[0098]

[0099] in:

[0100] h— — is soil suction, cm H 2 O,

[0101] θ s - is the saturated moisture content of the soil,

[0102] θ r —— is the soil withering water content,

[0103] θ - soil water content,

[0104] α , m , n —— is the parameter, where, . These three parameters are related to soil texture,

[0105] Table 1 Different soils and the value of

[0106] Soil texture (cm 3 / cm 3 ) ( cm 3 / cm 3 )

Embodiment 3

[0108] This embodiment is an improvement of the first embodiment, and it is a refinement of the first embodiment on the "unsaturated hydraulic conductivity of the wetting front". The empirical formula for calculating the "unsaturated hydraulic conductivity of the wetting front" in the "steps of calculating the moving velocity of the wetting front in the layer" described in this embodiment is:

[0109] K(θ) = K S (θ / f) b

[0110] in:

[0111] K(θ) ——is the unsaturated hydraulic conductivity,

[0112] θ - is the soil water content,

[0113] K S —— is the saturated hydraulic conductivity,

[0114] f—— is the soil porosity,

[0115] b —— is the empirical coefficient, which is generally taken as 2 for clayey soil and 4 for sandy soil.

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Abstract

The invention relates to a method for calculating critical burying depth of rainfall infiltration recharged groundwater. The method comprises the steps of: calculating saturated infiltration depth; calculating non-saturated infiltration depth based on the saturated infiltration depth; calculating the wetting front moving speed in a layer through hydraulic conductivity; judging whether the moving speed is greater than zero; calculating the moisture content of soil; calculating non-saturated infiltration depth; and calculating infiltration depth. According to the method, an action mechanism of the rainfall infiltration recharged groundwater is analyzed, a physical process of the rainfall infiltration recharged groundwater is explained, and the critical burying depth of the rainfall infiltration recharged groundwater is defined; a saturated and non-saturated infiltration theory is adopted, the wetting front moving distance is taken as a calculation target, and a rainfall infiltration depth calculation model is constructed for determining the critical burying depth of the groundwater. The method is clear and definite in physical process and action mechanism, has universality for damage on a reproducible mechanism caused by groundwater overdraft, and provides reliable theoretical and technical support for guiding groundwater resources to be reasonably developed and utilized and protecting groundwater aquifers.

Description

technical field [0001] The invention relates to a method for calculating the critical depth of groundwater for rainfall infiltration and recharge, which is an ecological hydrological calculation method and a method for calculating the critical depth of groundwater for controlling the depth of rainfall infiltration and recharge. Background technique [0002] For semi-arid and sub-humid areas, determining the groundwater level for infiltration and recharge is the key to maintaining the stability of the groundwater aquifer, and it is of great significance to protect the regeneration mechanism of the groundwater aquifer. Many agricultural areas are dominated by well irrigation, while groundwater recharge mainly comes from rainfall and irrigation return water. Due to the long-term development and utilization of groundwater, the groundwater table has dropped significantly and the buried depth has increased. The direct hydraulic connection between the underground aquifer and the cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 陈敏建张秋霞马静汪林曾向辉陈根发王鹏刘盈斐闫龙
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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