Method for simulating surface water flow movement process during surface irrigation

A simulation method, surface water flow technology, applied in the field of farmland water conservancy, can solve problems such as complex numerical solution process, low simulation accuracy, and large relative error

Active Publication Date: 2016-09-21
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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Problems solved by technology

[0008] In the process of realizing the present invention, the inventors found that the prior art has at least the following problems: the relative error between the simulated surface water flow movement process data obtained by the existing surface irrigation surface water flow movement process simulation method and the measured data is relatively large, and the simulation accuracy is not good. high
Moreover, the numerical solution process of the classical full hydrodynamic equation used in the existing surface irrigation surface water flow movement process simulation method is relatively complicated

Method used

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  • Method for simulating surface water flow movement process during surface irrigation
  • Method for simulating surface water flow movement process during surface irrigation
  • Method for simulating surface water flow movement process during surface irrigation

Examples

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Embodiment 1

[0067] In this embodiment, a field with a size of 50m×50m in the Yehe irrigation area of ​​Hebei Province is selected as the target border field, and the simulation method of the present invention is used to simulate the movement of surface water during winter irrigation of winter wheat in the target border field. The specific simulation method is as follows:

[0068] Step 101, adopt the double-loop infiltration method to carry out the soil infiltration test on the target border field, determine the infiltration parameters of the Kostiakov infiltration empirical formula and the dimensionless infiltration parameters of the Kostiakov infiltration empirical formula, and use the Kostiakov infiltration empirical formula: i c =αk in τ α-1 Calculate the surface water infiltration rate i of the target border field c . Among them, α is the dimensionless infiltration parameter of the Kostiakov infiltration empirical formula, and its value is the average value of the test results of e...

Embodiment 2

[0085] In this example, an 80m×50m field in a regiment of the Xinjiang Production and Construction Corps was selected as the target border field, and the surface water flow process during the spring irrigation of winter wheat in the target border field was simulated.

[0086] The specific simulation method is the same as in Example 1.

[0087] In the present embodiment, the infiltration parameters of the Kostiakov infiltration empirical formula, the dimensionless infiltration parameters of the Kostiakov infiltration empirical formula, the relative elevation of the ground surface and the surface roughness coefficient of the border surface are obtained according to the 2010 winter wheat spring irrigation test data of the target border field. The specific values ​​are shown in Table 2.

[0088] Table 2

[0089]

Embodiment 3

[0094] In this example, a 200m×60m field in a regiment of the Xinjiang Production and Construction Corps was selected as the target border field, and the surface water flow process during spring irrigation of winter wheat in the target border field was simulated.

[0095] The specific simulation method is the same as in Example 1.

[0096] In the present embodiment, the infiltration parameters of the Kostiakov infiltration empirical formula, the dimensionless infiltration parameters of the Kostiakov infiltration empirical formula, the relative elevation of the ground surface and the surface roughness coefficient of the border surface are obtained according to the 2010 winter wheat spring irrigation test data of the target border field. The specific values ​​are shown in Table 3.

[0097] table 3

[0098]

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Abstract

The invention discloses a method for simulating surface water flow movement process during surface irrigation, and belongs to the technical field of irrigation and water conservancy. The method comprises the following steps: a, acquiring surface relative elevation data, ridge surface roughness coefficient data and surface water infiltration rate data of a target ridged field; b, substituting the surface relative elevation data, the ridge surface roughness coefficient data and the surface water infiltration rate data into an improved full hydrodynamic equation, and carrying out numerical solution on the improved full hydrodynamic equation to obtain a simulation value of surface water depth of a certain measurement point in the target ridged field at a certain moment, and simulation values of vertical integral mean velocities of irrigation water flow along an x coordinate direction and a y coordinate direction; and C, obtaining simulation values of unit discharges of the irrigation water flow along the x coordinate direction and the y coordinate direction according to the simulation value of the surface water depth and the simulation values of the vertical integer mean velocities of the irrigation water flow along the x coordinate direction and the y coordinate direction. The method disclosed in the invention is high in simulation accuracy and simple in numerical value solution process.

Description

technical field [0001] The invention relates to the technical field of farmland water conservancy, in particular to a method for simulating the movement process of surface water flow for surface irrigation. Background technique [0002] Surface irrigation is currently the most widely used irrigation method in farmland irrigation. In order to design the surface irrigation system more rationally and achieve efficient water saving, it is necessary to simulate the surface water flow process of surface irrigation, that is, the distribution of irrigation water inflow and infiltration into the soil. [0003] At present, the method of simulating the movement process of surface water in surface irrigation is as follows: according to the relative elevation of the surface, the roughness coefficient of the border surface and the infiltration rate of the surface, the classical total hydrodynamic equation is used to calculate the surface water flow at a certain measuring point in the bord...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/367G06F30/00G06F30/23G06F30/20G06F2111/10G06F30/28
Inventor 许迪章少辉白美健李益农李福祥
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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