A method and system for simulating nitrogen and phosphorus reduction processes in rice irrigation areas

Abstract

This invention discloses a method and system for simulating nitrogen and phosphorus reduction processes in rice irrigation areas. The method includes: calculating the nitrogen and phosphorus concentrations in irrigation water and the nitrogen concentration in field surface water for the current cycle in the rice irrigation area based on meteorological data, field management data, and water quality monitoring data; determining the concentration of pollutants carried by surface runoff and the groundwater leaching load based on the nitrogen concentration in field surface water; calculating the migration and attenuation of nitrogen and phosphorus concentrations in ditches based on preset ditch parameters and the concentration of pollutants carried by surface runoff, obtaining the ditch outlet concentration; calculating the pond purification concentration based on preset pond parameters and the ditch outlet concentration; calculating the phosphorus concentration in recharge water based on the pond purification concentration and the recharge ratio; and updating the phosphorus concentration in irrigation water for the next cycle in the rice irrigation area based on the phosphorus concentration in recharge water, thus completing the simulation of the nitrogen and phosphorus reduction process in the rice irrigation area. This method can quickly and accurately simulate the nitrogen and phosphorus reduction process and emission load in each part of the rice irrigation area, from field to ditch to pond.

Description

Technical Field

[0001] This invention belongs to the field of rice irrigation area load simulation technology, and particularly relates to a method and system for simulating nitrogen and phosphorus reduction processes in rice irrigation areas. Background Technology

[0002] The existing SWAT model has significant shortcomings in simulating rice irrigation areas: its static parameterization method cannot accurately depict the diurnal variation process of nitrogen and phosphorus in the field surface water, it still uses a fixed attenuation coefficient for simulating the ditch-pond system, ignores key factors such as vegetation absorption and hydraulic residence time, and lacks a feedback mechanism for recharge water pollution, resulting in long-term simulation error accumulation of more than 25%. Summary of the Invention

[0003] This invention provides a method and system for simulating nitrogen and phosphorus reduction processes in rice irrigation areas, which solves the technical problem of being unable to quantify and simulate nitrogen and phosphorus reduction processes in rice irrigation areas.

[0004] In a first aspect, the present invention provides a method for simulating nitrogen and phosphorus reduction processes in rice irrigation areas, comprising:

[0005] Acquire meteorological data, field management data, and water quality monitoring data for rice irrigation areas;

[0006] The nitrogen and phosphorus concentrations in the irrigation water and the nitrogen concentration in the field water of the rice irrigation area for the current cycle are calculated based on the meteorological data, the field management data, and the water quality monitoring data.

[0007] The concentration of pollutants carried by surface runoff and the groundwater leaching load are determined based on the nitrogen concentration in the field surface water.

[0008] The migration and attenuation of nitrogen and phosphorus concentrations in the ditch are calculated based on the preset ditch parameters and the concentration of pollutants carried by the surface runoff, and the concentration at the ditch outlet is obtained.

[0009] The purification concentration of the pond is calculated based on the preset pond parameters and the concentration at the outlet of the ditch;

[0010] The phosphorus concentration in the recharge water is calculated based on the purification concentration of the ponds and the recharge ratio, and the phosphorus concentration in the next round of irrigation water in the rice irrigation area is updated based on the phosphorus concentration in the recharge water, thus simulating the nitrogen and phosphorus reduction process in the rice irrigation area.

[0011] Secondly, the present invention provides a simulation system for nitrogen and phosphorus reduction processes in rice irrigation areas, comprising:

[0012] The acquisition module is configured to acquire meteorological data, field management data, and water quality monitoring data for rice irrigation areas.

[0013] The first calculation module is configured to calculate the nitrogen and phosphorus concentrations of irrigation water and the nitrogen concentration of field surface water in the current cycle of the rice irrigation area based on the meteorological data, the field management data, and the water quality monitoring data, respectively.

[0014] The module is configured to determine the concentration of pollutants carried by surface runoff and the groundwater leaching load based on the nitrogen concentration in the field water.

[0015] The second calculation module is configured to calculate the migration and attenuation of nitrogen and phosphorus concentrations in the ditch based on preset ditch parameters and the concentration of pollutants carried by the surface runoff, and obtain the ditch outlet concentration.

[0016] The third calculation module is configured to calculate the purification concentration of the pond based on preset pond parameters and the concentration at the outlet of the ditch;

[0017] The update module is configured to calculate the phosphorus concentration of the recharge water based on the purification concentration of the pond and the recharge ratio, and update the phosphorus concentration of the next round of irrigation water in the rice irrigation area based on the phosphorus concentration of the recharge water, thereby simulating the nitrogen and phosphorus reduction process in the rice irrigation area.

[0018] Thirdly, an electronic device is provided, comprising: at least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the steps of the rice irrigation area nitrogen and phosphorus reduction process simulation method according to any embodiment of the present invention.

[0019] Fourthly, the present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein when the program instructions are executed by a processor, the processor performs the steps of the method for simulating nitrogen and phosphorus reduction processes in rice irrigation areas according to any embodiment of the present invention.

[0020] This application presents a method and system for simulating nitrogen and phosphorus reduction processes in rice irrigation areas. Based on meteorological data, field management data, and water quality monitoring data, it calculates the nitrogen and phosphorus concentrations in irrigation water and the nitrogen concentration in field surface water for the current cycle in the rice irrigation area. Based on the nitrogen concentration in field surface water, it determines the concentration of pollutants carried by surface runoff and the groundwater leaching load. Based on preset ditch parameters and the concentration of pollutants carried by surface runoff, it calculates the migration and attenuation of nitrogen and phosphorus concentrations in the ditches, obtaining the ditch outlet concentration. Based on preset pond parameters and the ditch outlet concentration, it calculates the pond purification concentration. Based on the pond purification concentration and the recharge ratio, it calculates the recharge phosphorus concentration and updates the next cycle's irrigation phosphorus concentration in the rice irrigation area based on the recharge phosphorus concentration. This completes the simulation of nitrogen and phosphorus reduction processes in rice irrigation areas. It can quickly and accurately simulate the nitrogen and phosphorus reduction processes and emission loads in each part of the rice irrigation area (field, ditch, pond), providing a scientific basis for the treatment of agricultural non-point source pollution and the selection of water-saving and emission-reduction technology models. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A flowchart illustrating a method for simulating nitrogen and phosphorus reduction processes in rice irrigation areas, provided in an embodiment of the present invention;

[0023] Figure 2 This is a structural block diagram of a simulation system for nitrogen and phosphorus reduction processes in rice irrigation areas, provided in an embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figure 1 The diagram shows a flowchart of a method for simulating nitrogen and phosphorus reduction processes in rice irrigation areas according to this application.

[0027] like Figure 1 As shown, the simulation method for nitrogen and phosphorus reduction in rice irrigation areas specifically includes the following steps:

[0028] Step S101: Obtain meteorological data, field management data, and water quality monitoring data for the rice irrigation area.

[0029] Step S102: Calculate the nitrogen and phosphorus concentrations of irrigation water and the nitrogen concentration of field surface water in the current cycle of the rice irrigation area based on the meteorological data, the field management data, and the water quality monitoring data.

[0030] In this step, the expression for calculating the nitrogen and phosphorus concentrations in the irrigation water is:

[0031] ,

[0032] In the formula, The total amount of nitrogen and phosphorus brought into the rice irrigation area by irrigation. This refers to the total nitrogen and phosphorus concentration in a single irrigation. This refers to the amount of water used in a single irrigation.

[0033] Furthermore, the nitrogen concentration in field surface water includes the nitrogen concentration in the field surface water. Concentration and field surface water Concentration, among which, the calculation of field surface water The expression for concentration is:

[0034] ,

[0035] In the formula, For field water concentration, This refers to the amount of fertilizer applied per application. for Concentration attenuation coefficient, For the number of days of fertilization, The depth of water on the field surface. During the rainfall concentration, This refers to the rainfall in a single instance. For irrigation concentration, This refers to the amount of water used for irrigation.

[0036] Calculate field surface water The expression for concentration is:

[0037] ,

[0038] In the formula, For field water concentration, The principal coefficient of nitration, This is a correction factor for nitration. During the rainfall concentration, For irrigation Ion concentration.

[0039] Step S103: Determine the concentration of pollutants carried by surface runoff and the groundwater leaching load based on the nitrogen concentration in the field surface water.

[0040] In this step, the underground leaching load includes the leaching nitrogen concentration, which is expressed as follows:

[0041] ,

[0042] ,

[0043] In the formula, In underground leachate concentration, In underground leachate concentration, For field water concentration, For field water concentration, This refers to the amount of fertilizer applied per application. for The transmission coefficient, for The transmission coefficient, for The attenuation coefficient, for The transmission coefficient, This represents the number of days since the fertilization date.

[0044] The expression for calculating the concentration of pollutants carried by surface runoff is:

[0045] ,

[0046] ,

[0047] ,

[0048] In the formula, For the concentration of pollutants carried by surface runoff, Surface runoff, Rainfall for the day This is the initial loss amount, usually taken as... , Maximum soil retention The curve number ranges from 0 to 100 and is determined by the land use type and previous soil moisture conditions.

[0049] Step S104: Based on the preset ditch parameters and the concentration of pollutants carried by the surface runoff, calculate the migration and attenuation of nitrogen and phosphorus concentrations in the ditch to obtain the ditch outlet concentration.

[0050] In this step, the expression for calculating the concentration at the ditch outlet is:

[0051] ,

[0052] In the formula, The concentration at the ditch outlet. For the concentration of pollutants carried by surface runoff, This refers to the length of the ditch where nitrogen and phosphorus are absorbed. This refers to the length of the ditch.

[0053] Step S105: Calculate the purification concentration of the pond based on the preset pond parameters and the concentration at the outlet of the ditch.

[0054] In this step, the expression for calculating the concentration of the purified water in the pond is:

[0055] ,

[0056] In the formula, The concentration of the purified water in the ponds and weirs, The concentration at the ditch outlet. For the concentration of pollutants carried by surface runoff, Let be the volume removal rate constant. The residence time of the water.

[0057] Step S106: Calculate the phosphorus concentration in the recharge water based on the purification concentration of the pond and the recharge ratio, and update the phosphorus concentration in the next round of irrigation water in the rice irrigation area based on the phosphorus concentration in the recharge water, thus completing the simulation of the nitrogen and phosphorus reduction process in the rice irrigation area.

[0058] In this step, the phosphorus concentration in the recharge water is obtained by multiplying the concentration of the purified water in the pond by the recharge ratio. Recharge ratio This indicates the proportion of purified water from ponds and reservoirs used for irrigation (0 ≤ ≤1), its determination needs to be combined with actual irrigation needs and water quality safety restrictions.

[0059] In summary, the method of this application can accurately simulate the migration and transformation process of nitrogen and phosphorus pollution in each part of the field-ditch-pond, thereby obtaining the nitrogen and phosphorus emission load of the study area, providing a scientific tool and feasible treatment approach for the study of non-point source pollution reduction in irrigation areas.

[0060] In one specific embodiment, the method for simulating nitrogen and phosphorus reduction processes in rice irrigation areas specifically includes:

[0061] Step I. Increase irrigation water to introduce phosphorus;

[0062] The calculation process for increasing the phosphorus content introduced into the paddy field with each irrigation is shown in Formula 1:

[0063] , formula 1

[0064] Step II. Improvement of the ammonia nitrogen nitrification process in field surface water.

[0065] Add water to the field and The daily variation model of concentration, and the specific calculation process are shown in Formulas 2 and 3:

[0066] , formula 2

[0067] , formula 3

[0068] Step III. Improvement of Nitrogen Leaching Loss Process

[0069] By introducing the transfer coefficient and attenuation coefficient, a diurnal variation equation for the nitrogen concentration in the leachate was established. The specific calculation process is shown in Equations 4 and 5.

[0070] , formula 4

[0071] , formula 5

[0072] Step IV. Improvement of ammonia volatilization process in paddy fields

[0073] The adoption of methods that take into account the pH of the field surface water and A diurnal variation model of ammonia volatilization rate in paddy fields, influencing factors such as -N concentration, air temperature, and wind speed, was used to simulate ammonia volatilization in paddy fields. The specific calculation process is shown in Formula 6.

[0074] , formula 6

[0075] Step V. Improvement of the denitrification process in paddy fields

[0076] The daily rate of denitrification was calculated using a one-dimensional plug flow reaction kinetic equation, as shown in Equation 7.

[0077] , Formula 7

[0078] In the formula, This refers to the amount of nitrate denitrification. Within the soil solution of the reducing zone Concentration, mg / L; t represents the denitrification rate coefficient, and t represents the number of days after a certain fertilization.

[0079] Step VI. Improvement of Ditch Relocation and Reduction Process

[0080] An exponential decay model is used to calculate the decay process of pollutants in the river channel, as shown in Equation 8:

[0081] , formula 8

[0082] Step VII. Improvement of Nitrogen and Phosphorus Removal Process in Ponds and Weirs

[0083] A two-parameter first-order kinetic model was used to simulate the transformation process of nutrients in the pond, and the specific calculation is shown in Equation 9:

[0084] , formula 9

[0085] Step VIII. Simulation of Nitrogen and Phosphorus Pollutant Reduction Process and Emission Load

[0086] Based on measured data and simulation requirements of the study area, the necessary parameters are input into the model, and then the model is run to simulate the nitrogen and phosphorus pollution emission load in the rice irrigation area. The improved model fully considers the reduction effects of nitrogen and phosphorus on the field-ditch-pond system, accurately reflects the nitrogen and phosphorus migration and transformation process in the irrigation area, and improves the simulation accuracy of nitrogen and phosphorus pollution emission load.

[0087] In step I, the amount of water used in a single irrigation is... The total phosphorus concentration in a single irrigation was obtained based on model simulation. This method involves multiple sampling and testing of irrigation water sources in the study area during the rice growing season. Relatively stable concentration values ​​or average values ​​are then used as the input to the model for calculating the total phosphorus concentration in the irrigation water. Step I simulates the single irrigation volume of each paddy field's HRU (Heat-Rich Root) and the total phosphorus content introduced by each irrigation, outputting the result as a txt file.

[0088] In step II, the amount of fertilizer applied per application This information was obtained through extensive research into the management practices of local farmers; rainfall and irrigation data. and concentration , and , By conducting multiple sampling and testing of rainfall and irrigation water sources in the study area during the rice growing season, relatively stable concentration values ​​or average values ​​were taken as the concentration of [unspecified substance] in rainfall and irrigation water sources. and Concentration input into the model; number of fertilization days (t), field surface water depth Irrigation volume The amount of rainfall in a single event was obtained through model simulation. Obtained by reading meteorological data from the model; Concentration attenuation coefficient nitration principal coefficient and nitration correction coefficient and All data were obtained through calibration using measured data and then input into the model via code for calculation. Step II allows for the simulation of daily HRU values ​​for each paddy field. and Concentration, output as a txt file.

[0089] In step III, The transmission coefficient, attenuation coefficient and Transmission coefficient, attenuation coefficient and The measured data obtained from field experiments were calibrated and then input into the model for calculation via code. Step III simulates the nitrogen leaching loss during the HRU process in paddy fields with a water layer. Concentration, output via a txt file.

[0090] Step IV adds consideration of the pH of the field surface water and The effects of N-N concentration, temperature, wind speed, and other factors on the ammonia volatilization rate in paddy fields, including the ammonia volatilization coefficient. Temperature coefficients a and b, wind speed coefficients c, d, and h, and pH coefficients e and f were all calibrated using measured data obtained from field experiments. The pH value of the field surface water was determined by multiple sampling and testing of the field surface water in the study area, and the most stable pH value was input into the model for calculation. Step VI simulates the nitrogen and phosphorus concentrations entering and leaving the ecological ditch, as well as the nitrogen and phosphorus content absorbed and reduced by the ecological ditch, and outputs the results as a txt file.

[0091] In step V, the soil solution in the reduction zone concentration The denitrification rate coefficient was obtained through multiple sampling and testing of the study area and input into the model via code for calculation. The data obtained from field experiments were calibrated and then input into the model via code for calculation. Step V simulates the daily rate of HRU denitrification in paddy fields and the daily loss of soil solution through denitrification. Concentration, output via a txt file.

[0092] In step VI, the absorption length of ammonia in the ecological ditch The measured data obtained from field experiments are calibrated and then input into the model for calculation via code. Step VI simulates the nitrogen and phosphorus concentrations entering and leaving the ecological ditch, as well as the nitrogen and phosphorus content absorbed and reduced by the ecological ditch, and outputs the results as a txt file.

[0093] In step VII, the wetland background pigment concentration, volumetric removal rate constant, and water retention time t were all calibrated using measured data obtained from field tests and input into the model via code for calculation. When hydraulic stagnation occurs, it is considered... The value is 0. Step VI simulates the nitrogen and phosphorus concentrations entering the wetland, the nitrogen and phosphorus content removed by the wetland, and the nitrogen and phosphorus content flowing out of the wetland, and outputs them as a txt file.

[0094] Please see Figure 2 The diagram shows a structural block diagram of a simulation system for nitrogen and phosphorus reduction processes in rice irrigation areas according to this application.

[0095] like Figure 2 As shown, the simulation system 200 for nitrogen and phosphorus reduction process in rice irrigation area includes an acquisition module 210, a first calculation module 220, a determination module 230, a second calculation module 240, a third calculation module 250, and an update module 260.

[0096] The system includes the following modules: an acquisition module 210, configured to acquire meteorological data, field management data, and water quality monitoring data of the rice irrigation area; a first calculation module 220, configured to calculate the nitrogen and phosphorus concentrations of irrigation water and the nitrogen concentration of field surface water in the current cycle of the rice irrigation area based on the meteorological data, the field management data, and the water quality monitoring data, respectively; a determination module 230, configured to determine the concentration of pollutants carried by surface runoff and the groundwater leaching load based on the nitrogen concentration of field surface water; a second calculation module 240, configured to calculate the migration and attenuation of nitrogen and phosphorus concentrations in ditches based on preset ditch parameters and the concentration of pollutants carried by surface runoff, thereby obtaining the concentration at the ditch outlet; a third calculation module 250, configured to calculate the purification concentration of ponds and weirs based on preset pond and weir parameters and the concentration at the ditch outlet; and an update module 260, configured to calculate the phosphorus concentration of recharge water based on the purification concentration of ponds and weirs and the recharge ratio, and update the phosphorus concentration of irrigation water for the next cycle of the rice irrigation area based on the phosphorus concentration of recharge water, thus simulating the nitrogen and phosphorus reduction process in the rice irrigation area.

[0097] It should be understood that Figure 2 The modules and references described in the document Figure 1 The steps described in the text correspond to those in the method described above. Therefore, the operations, features, and corresponding technical effects described above also apply to the method described in the text. Figure 2 The various modules in the document will not be described in detail here.

[0098] In other embodiments, the present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein when the program instructions are executed by a processor, the processor performs the simulation method for nitrogen and phosphorus reduction process in rice irrigation areas in any of the above method embodiments.

[0099] In one embodiment, the computer-readable storage medium of the present invention stores computer-executable instructions, which are configured as follows:

[0100] Acquire meteorological data, field management data, and water quality monitoring data for rice irrigation areas;

[0101] The nitrogen and phosphorus concentrations in the irrigation water and the nitrogen concentration in the field water of the rice irrigation area for the current cycle are calculated based on the meteorological data, the field management data, and the water quality monitoring data.

[0102] The concentration of pollutants carried by surface runoff and the groundwater leaching load are determined based on the nitrogen concentration in the field surface water.

[0103] The migration and attenuation of nitrogen and phosphorus concentrations in the ditch are calculated based on the preset ditch parameters and the concentration of pollutants carried by the surface runoff, and the concentration at the ditch outlet is obtained.

[0104] The purification concentration of the pond is calculated based on the preset pond parameters and the concentration at the outlet of the ditch;

[0105] The phosphorus concentration in the recharge water is calculated based on the purification concentration of the ponds and the recharge ratio, and the phosphorus concentration in the next round of irrigation water in the rice irrigation area is updated based on the phosphorus concentration in the recharge water, thus simulating the nitrogen and phosphorus reduction process in the rice irrigation area.

[0106] Computer-readable storage media may include a stored program area and a stored data area, wherein the stored program area may store an operating system and an application program required for at least one function; the stored data area may store data created based on the use of the rice irrigation area nitrogen and phosphorus reduction process simulation system, etc. Furthermore, the computer-readable storage medium may include high-speed random access memory, and may also include memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the computer-readable storage medium may optionally include memory remotely configured relative to a processor, which can be connected to the rice irrigation area nitrogen and phosphorus reduction process simulation system via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0107] Figure 3 This is a schematic diagram of the structure of the electronic device provided in the embodiment of the present invention, such as... Figure 3 As shown, the device includes a processor 310 and a memory 320. The electronic device may also include an input device 330 and an output device 340. The processor 310, memory 320, input device 330, and output device 340 can be connected via a bus or other means. Figure 3 Taking a bus connection as an example, the memory 320 is the computer-readable storage medium described above. The processor 310 executes various server functions and data processing by running non-volatile software programs, instructions, and modules stored in the memory 320, thereby implementing the rice irrigation area nitrogen and phosphorus reduction process simulation method described in the above embodiment. The input device 330 can receive input digital or character information and generate key signal inputs related to user settings and function control of the rice irrigation area nitrogen and phosphorus reduction process simulation system. The output device 340 may include a display screen or other display device.

[0108] The aforementioned electronic device can execute the method provided in the embodiments of the present invention, and has the corresponding functional modules and beneficial effects for executing the method. Technical details not described in detail in this embodiment can be found in the method provided in the embodiments of the present invention.

[0109] In one implementation, the above-described electronic device is applied to a simulation system for nitrogen and phosphorus reduction processes in rice irrigation areas. As a client, it includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, which, when executed by the at least one processor, enable the at least one processor to:

[0110] Acquire meteorological data, field management data, and water quality monitoring data for rice irrigation areas;

[0111] The nitrogen and phosphorus concentrations in the irrigation water and the nitrogen concentration in the field water of the rice irrigation area for the current cycle are calculated based on the meteorological data, the field management data, and the water quality monitoring data.

[0112] The concentration of pollutants carried by surface runoff and the groundwater leaching load are determined based on the nitrogen concentration in the field surface water.

[0113] The migration and attenuation of nitrogen and phosphorus concentrations in the ditch are calculated based on the preset ditch parameters and the concentration of pollutants carried by the surface runoff, and the concentration at the ditch outlet is obtained.

[0114] The purification concentration of the pond is calculated based on the preset pond parameters and the concentration at the outlet of the ditch;

[0115] The phosphorus concentration in the recharge water is calculated based on the purification concentration of the ponds and the recharge ratio, and the phosphorus concentration in the next round of irrigation water in the rice irrigation area is updated based on the phosphorus concentration in the recharge water, thus simulating the nitrogen and phosphorus reduction process in the rice irrigation area.

[0116] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for simulating nitrogen and phosphorus reduction processes in rice irrigation areas, characterized in that, include: Acquire meteorological data, field management data, and water quality monitoring data for rice irrigation areas; Based on the meteorological data, field management data, and water quality monitoring data, the nitrogen and phosphorus concentrations in the irrigation water and the nitrogen concentration in the field surface water for the current irrigation cycle in the rice irrigation area are calculated, wherein the expression for calculating the nitrogen and phosphorus concentrations in the irrigation water is: ， In the formula, The total amount of nitrogen and phosphorus brought into the rice irrigation area by irrigation. This refers to the total nitrogen and phosphorus concentration in a single irrigation. This refers to the amount of water used in a single irrigation. The nitrogen concentration in the field water includes the nitrogen concentration in the field water. Concentration and field surface water Concentration, wherein the field surface water is calculated. The expression for concentration is: ， In the formula, For field water concentration, This refers to the amount of fertilizer applied per application. for Concentration attenuation coefficient, For the number of days of fertilization, The depth of water on the field surface. During the rainfall concentration, This refers to the rainfall in a single instance. For irrigation concentration, This refers to the amount of water used for irrigation. Calculate the field surface water The expression for concentration is: ， In the formula, For field water concentration, The principal coefficient of nitration, This is a correction factor for nitration. During the rainfall concentration, For irrigation Ion concentration; The concentration of pollutants carried by surface runoff and the groundwater leaching load are determined based on the nitrogen concentration in the field surface water. The groundwater leaching load includes the nitrogen concentration in the leaching solution, which is expressed as follows: ， ， In the formula, In underground leachate concentration, In underground leachate concentration, For field water concentration, For field water concentration, This refers to the amount of fertilizer applied per application. for The transmission coefficient, for The transmission coefficient, for The attenuation coefficient, for The transmission coefficient, This represents the number of days since the fertilization date; Based on preset ditch parameters and the concentration of pollutants carried by surface runoff, the migration and attenuation of nitrogen and phosphorus concentrations in the ditch are calculated to obtain the ditch outlet concentration. The expression for calculating the concentration of pollutants carried by surface runoff is as follows: , ， ， In the formula, For the concentration of pollutants carried by surface runoff, Surface runoff, Rainfall for the day For the initial loss, take , Maximum soil retention The curve number, ranging from 0 to 100, is determined by the land use type and previous soil moisture conditions. The purification concentration of the pond is calculated based on the preset pond parameters and the concentration at the outlet of the ditch; The phosphorus concentration in the recharge water is calculated based on the purification concentration of the ponds and the recharge ratio, and the phosphorus concentration in the next round of irrigation water in the rice irrigation area is updated based on the phosphorus concentration in the recharge water, thus simulating the nitrogen and phosphorus reduction process in the rice irrigation area.

2. The method for simulating nitrogen and phosphorus reduction processes in rice irrigation areas according to claim 1, characterized in that, The expression for calculating the concentration at the outlet of the ditch is as follows: ， In the formula, The concentration at the ditch outlet. For the concentration of pollutants carried by surface runoff, This refers to the length of the ditch where nitrogen and phosphorus are absorbed. This refers to the length of the ditch.

3. The method for simulating nitrogen and phosphorus reduction processes in rice irrigation areas according to claim 1, characterized in that, The expression for calculating the purification concentration of the pond is: ， In the formula, The concentration of the purified water in the ponds and weirs, The concentration at the ditch outlet. For the concentration of pollutants carried by surface runoff, Let be the volume removal rate constant. The residence time of the water.

4. A simulation system for nitrogen and phosphorus reduction processes in rice irrigation areas, characterized in that, include: The acquisition module is configured to acquire meteorological data, field management data, and water quality monitoring data for rice irrigation areas. The first calculation module is configured to calculate the irrigation nitrogen and phosphorus concentrations and the surface water nitrogen concentration in the rice irrigation area for the current cycle based on the meteorological data, the field management data, and the water quality monitoring data, respectively. The expression for calculating the irrigation nitrogen and phosphorus concentrations is as follows: ， In the formula, The total amount of nitrogen and phosphorus brought into the rice irrigation area by irrigation. This refers to the total nitrogen and phosphorus concentration in a single irrigation. This refers to the amount of water used in a single irrigation. The nitrogen concentration in the field water includes the nitrogen concentration in the field water. Concentration and field surface water Concentration, wherein the field surface water is calculated. The expression for concentration is: ， In the formula, For field water concentration, This refers to the amount of fertilizer applied per application. for Concentration attenuation coefficient, For the number of days of fertilization, The depth of water on the field surface. During the rainfall concentration, This refers to the rainfall in a single instance. For irrigation concentration, This refers to the amount of water used for irrigation. Calculate the field surface water The expression for concentration is: ， In the formula, For field water concentration, The principal coefficient of nitration, This is a correction factor for nitration. During the rainfall concentration, For irrigation Ion concentration; The determination module is configured to determine the concentration of pollutants carried by surface runoff and the groundwater leaching load based on the nitrogen concentration in the field surface water. The groundwater leaching load includes the nitrogen concentration in the leaching solution, which is expressed as: ， ， In the formula, In underground leachate concentration, In underground leachate concentration, For field water concentration, For field water concentration, This refers to the amount of fertilizer applied per application. for The transmission coefficient, for The transmission coefficient, for The attenuation coefficient, for The transmission coefficient, This represents the number of days since the fertilization date; The second calculation module is configured to calculate the migration and attenuation of nitrogen and phosphorus concentrations in the ditch based on preset ditch parameters and the concentration of pollutants carried by the surface runoff, thereby obtaining the ditch outlet concentration. The expression for calculating the concentration of pollutants carried by the surface runoff is as follows: , ， ， In the formula, For the concentration of pollutants carried by surface runoff, Surface runoff, Rainfall for the day For the initial loss, take , Maximum soil retention The curve number, ranging from 0 to 100, is determined by the land use type and previous soil moisture conditions. The third calculation module is configured to calculate the purification concentration of the pond based on preset pond parameters and the concentration at the outlet of the ditch; The update module is configured to calculate the phosphorus concentration of the recharge water based on the purification concentration of the pond and the recharge ratio, and update the phosphorus concentration of the next round of irrigation water in the rice irrigation area based on the phosphorus concentration of the recharge water, thereby simulating the nitrogen and phosphorus reduction process in the rice irrigation area.

5. An electronic device, characterized in that, include: At least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 3.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method according to any one of claims 1 to 3.

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