Method and system for quantifying spatial amount of total nitrogen of agricultural planting non-point source pollution into sea

Abstract

The application belongs to the technical field of total nitrogen surface pollution into the sea in agricultural planting, and particularly relates to a calculation method and system for quantifying the space of total nitrogen surface pollution into the sea in agricultural planting, which comprises the following steps: obtaining the total nitrogen pollution output coefficient of each agricultural planting unit; calculating the total nitrogen surface pollution transport capacity index of agricultural planting based on the minimum cumulative resistance model of surface pollution migration; calculating the actual total nitrogen surface pollution into the sea value of agricultural planting, the correction coefficient of the total nitrogen surface pollution into the sea value of agricultural planting and the total nitrogen surface pollution transport coefficient of agricultural planting according to the monitoring data of the estuary; and calculating the total nitrogen surface pollution into the sea value of the agricultural planting unit in the space scale according to the total nitrogen surface pollution transport coefficient of agricultural planting and the total nitrogen pollution output coefficient of each agricultural planting unit, so as to complete the space quantification calculation of the total nitrogen surface pollution into the sea in agricultural planting.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of total nitrogen pollution from agricultural planting into the sea, and particularly relates to a method and system for quantifying the spatial amount of total nitrogen pollution from agricultural planting into the sea. BACKGROUND

[0002] The statements in this section merely provide background information related to the application and do not necessarily constitute prior art.

[0003] Total nitrogen pollution from agricultural planting into the sea is one of the main threat factors affecting the ecological environment of nearshore water bodies. With the development of intensive agriculture, the extensive use of fertilizers and pesticides has exacerbated nitrogen loss, leading to a large amount of nitrogen pollutants entering rivers through runoff and ultimately flowing into the ocean, causing a series of ecological and environmental problems such as eutrophication and algal blooms in nearshore water bodies. Therefore, accurately assessing the total nitrogen pollution from agricultural planting into the sea has become an urgent problem in current research and practice.

[0004] Total nitrogen pollution from agricultural planting is widely dispersed in source, with a complex diffusion process, and is influenced by land use, natural environment, and climate conditions during migration, making it difficult to quantify and assess the total nitrogen pollution from source to final discharge into the ocean.

[0005] Currently, the methods for analyzing and evaluating total nitrogen pollution from agricultural planting into the sea mainly include the section monitoring method and the model simulation method. The section monitoring method involves setting up multiple hydrological and water quality monitoring stations at key points or at the mouth of the river flowing into the sea in coastal areas, collecting water samples at different sections of the river, and bringing them to the laboratory for testing to obtain hydrological and water quality data. Through long-term monitoring, the total amount of agricultural total nitrogen pollution from agricultural land, which is generated, diffused and migrated through surface runoff, and ultimately flows into the ocean through the river, can be obtained based on the hydrological and water quality data of the river flowing into the sea using scientific and reasonable calculation methods. The model simulation method uses environmental simulation models (such as the SWAT model, IMAGE-GNM model, etc.) to simulate the process of total nitrogen pollution from agricultural planting into the sea in the study area. By inputting meteorological, topographic, and land use data parameters to drive the model, the hydrological process within the watershed is simulated based on the rainfall-runoff relationship, and the total nitrogen flux of total nitrogen pollution from agricultural planting into the sea through surface runoff and other means is calculated based on the total nitrogen loss of agricultural crops.

[0006] The prior art does not systematically connect the whole process of agricultural planting total nitrogen non-point source pollution, including agricultural pollution source emission, total nitrogen non-point source pollution diffusion and migration, and final total nitrogen pollution into the sea. The prior art mainly focuses on a key node in the process of agricultural planting total nitrogen non-point source pollution into the sea, for example, the monitoring data is mainly relied on to count the amount of agricultural total nitrogen non-point source pollution into the sea, and the model simulation method focuses on the diffusion and migration process of agricultural total nitrogen non-point source pollution. The above methods are not systematically and comprehensively studied, and therefore the prior art cannot accurately quantify the spatial scale of agricultural planting total nitrogen non-point source pollution. The existing technical solutions and calculation methods mainly focus on the overall situation of agricultural planting total nitrogen non-point source pollution into the sea, and lack of research and calculation methods for the situation of agricultural planting unit total nitrogen pollution into the sea in the spatial scale. SUMMARY

[0007] To solve the above problems, the present application provides a calculation method and system for spatial quantification of agricultural planting total nitrogen non-point source pollution into the sea, which calculates the final amount of total nitrogen non-point source pollution into the sea of each agricultural planting unit in the spatial scale based on the whole process of agricultural planting total nitrogen non-point source pollution, including the source, land surface diffusion and migration, and finally the confluence into the sea through the river into the sea, to provide decision support for the prevention and control of agricultural planting total nitrogen non-point source pollution into the sea.

[0008] According to some embodiments, the first aspect of the present application provides a calculation method for spatial quantification of agricultural planting total nitrogen non-point source pollution into the sea, which adopts the following technical solution:

[0009] A calculation method for spatial quantification of agricultural planting total nitrogen non-point source pollution into the sea, comprising:

[0010] obtaining the total nitrogen pollution output coefficient of each agricultural planting unit;

[0011] calculating the total nitrogen non-point source pollution transport capacity index of agricultural planting based on the minimum cumulative resistance model of non-point source pollutant migration;

[0012] calculating the actual total nitrogen non-point source pollution into the sea of agricultural planting according to the monitoring data at the estuary, combining the potential total nitrogen non-point source pollution into the sea of agricultural planting calculated by the total nitrogen non-point source pollution output coefficient and the transport capacity index of agricultural planting unit to obtain the correction coefficient of the amount of total nitrogen non-point source pollution into the sea of agricultural planting, and obtaining the transport coefficient of total nitrogen non-point source pollution of agricultural planting according to the correction coefficient of the amount of total nitrogen non-point source pollution into the sea of agricultural planting and the transport capacity index of total nitrogen non-point source pollution of agricultural planting obtained;

[0013] calculating the amount of total nitrogen non-point source pollution into the sea of agricultural planting unit in the spatial scale according to the transport coefficient of total nitrogen non-point source pollution of agricultural planting obtained and the total nitrogen pollution output coefficient of each agricultural planting unit, and completing the spatial quantification calculation of the total nitrogen non-point source pollution into the sea of agricultural planting.

[0014] As a further technical limitation, the estuary monitoring data shall at least include the total nitrogen pollutant concentration at the estuary, the net flow rate at the estuary, and the monitoring time; the actual value of total nitrogen non-point source pollution from agricultural planting entering the sea, Q, is... Where n is the total number of estuaries; i is the i-th estuary; Q i Let Q be the total nitrogen pollution from land sources entering the sea at the i-th estuary, and Q i =c i R i t, c i Let R be the total nitrogen pollutant concentration at the i-th estuary. i Let r be the runoff at the i-th estuary, and t be the monitoring time; ansp The proportion of total nitrogen pollution discharged into the ocean that comes from agriculture; sl The percentage of total nitrogen non-point source pollution caused by crop output; r rain This represents the percentage of annual rainfall during the monitoring period in the study area.

[0015] Furthermore, the potential marine discharge value Q of total nitrogen non-point source pollution from agricultural planting... * for Where m is the total number of agricultural planting units; j is the j-th agricultural planting unit; E j T represents the total nitrogen pollution output coefficient of the j-th agricultural planting unit; j denoted as the total nitrogen non-point source pollution transport capacity index for the j-th agricultural planting unit; s represents the area of ​​each agricultural planting unit.

[0016] Furthermore, the total nitrogen non-point source pollution transport coefficient T in agricultural planting * For T * =ηT; where η is the correction coefficient for total nitrogen non-point source pollution entering the sea from agricultural planting, i.e. T represents the transport capacity index of total nitrogen non-point source pollution from agricultural planting.

[0017] As a further technical limitation, the total nitrogen non-point source pollution entering the sea from agricultural planting units at the aforementioned spatial scale is the total nitrogen non-point source pollution entering the sea considering agricultural planting units, that is, the total nitrogen non-point source pollution entering the sea from the j-th agricultural planting unit q. j for Among them, E j Let J be the total nitrogen pollution output coefficient of the j-th agricultural planting unit; Let be the total nitrogen non-point source pollution transport coefficient of the j-th agricultural planting unit; s be the area of ​​each agricultural planting unit.

[0018] As a further technical limitation, the minimum cumulative resistance value is calculated by using a surface source pollutant migration minimum cumulative resistance model, and the total nitrogen surface source pollution transport capacity index of agricultural planting is calculated according to the obtained minimum cumulative resistance value; the surface source pollutant migration minimum cumulative resistance model is at least related to a surface source pollution diffusion migration influence factor.

[0019] According to some embodiments, the second aspect of the present application provides a calculation system for quantifying the spatial amount of total nitrogen surface source pollution of agricultural planting into the sea, which adopts the following technical solution:

[0020] A calculation system for quantifying the spatial amount of total nitrogen surface source pollution of agricultural planting into the sea comprises:

[0021] An acquisition module configured to acquire a total nitrogen pollution output coefficient of each agricultural planting unit;

[0022] A first calculation module configured to calculate a total nitrogen surface source pollution transport capacity index of agricultural planting based on a surface source pollutant migration minimum cumulative resistance model;

[0023] A second calculation module configured to calculate an actual total nitrogen surface source pollution into-the-sea value of agricultural planting according to estuary monitoring data, and to calculate a total nitrogen surface source pollution potential into-the-sea value of agricultural planting by combining the total nitrogen pollution output coefficient of the agricultural planting unit and the transport capacity index calculated by the first calculation module, so as to obtain a total nitrogen surface source pollution into-the-sea amount correction coefficient of agricultural planting; and to obtain a total nitrogen surface source pollution transport coefficient of agricultural planting according to the obtained total nitrogen surface source pollution into-the-sea amount correction coefficient of agricultural planting and the obtained total nitrogen surface source pollution transport capacity index of agricultural planting;

[0024] A spatial quantification module configured to calculate the total nitrogen surface source pollution into-the-sea amount of the agricultural planting unit on a spatial scale according to the obtained total nitrogen surface source pollution transport coefficient of agricultural planting and the total nitrogen pollution output coefficient of each agricultural planting unit, so as to complete the spatial quantification calculation of the total nitrogen surface source pollution into-the-sea of agricultural planting.

[0025] According to some embodiments, the third aspect of the present application provides a computer readable storage medium, which adopts the following technical solution:

[0026] A computer readable storage medium having a program stored thereon, the program being executed by a processor to implement the steps in the calculation method for quantifying the spatial amount of total nitrogen surface source pollution of agricultural planting into the sea according to the first aspect of the present application.

[0027] According to some embodiments, the fourth aspect of the present application provides an electronic device, which adopts the following technical solution:

[0028] An electronic device includes a memory, a processor, and a program stored on the memory and running on the processor, and the processor implements the steps in the calculation method for quantifying the spatial amount of total nitrogen surface source pollution into the sea in agricultural planting according to the first aspect of the present application when executing the program.

[0029] According to some embodiments, the fifth aspect of the present application provides a computer program product, which adopts the technical scheme as follows:

[0030] A computer program product includes software codes, and the program in the software codes performs the steps in the calculation method for quantifying the spatial amount of total nitrogen surface source pollution into the sea in agricultural planting according to the first aspect of the present application.

[0031] Compared with the prior art, the present application has the following beneficial effects:

[0032] The present application simulates the whole process from the source output of total nitrogen surface source pollution in agricultural planting to the diffusion and migration process of total nitrogen surface source pollution and to the total nitrogen surface source pollution into the sea, and corrects the simulation results by combining with the monitoring data of total nitrogen surface source pollution into the sea, so that the amount of total nitrogen pollution from the agricultural planting unit and finally into the sea can be obtained.

[0033] The present application obtains the total nitrogen pollution output coefficient of the agricultural planting unit, calculates the transport capacity index of total nitrogen surface source pollution in agricultural planting by using the minimum cumulative resistance model (NPS-MCR) of surface source pollution, corrects the transport capacity index by combining with the hydrological and water quality monitoring data at the estuary, and obtains the total nitrogen surface source pollution transport coefficient of agricultural planting; and the amount of total nitrogen surface source pollution into the sea in the spatial scale of the agricultural planting unit is obtained by using the total nitrogen pollution output coefficient of the agricultural planting unit and the total nitrogen surface source pollution transport coefficient of agricultural planting, so that the spatial quantification of the amount of total nitrogen surface source pollution into the sea in agricultural planting is finally realized.

[0034] The present application provides a complete process from the acquisition of the total nitrogen pollution output value of the agricultural planting unit to the simulation of the diffusion and migration process of total nitrogen surface source pollution and to the calculation of the amount of total nitrogen surface source pollution into the sea; ensures the technical innovation and application uniqueness in the field of spatial quantification calculation of total nitrogen surface source pollution into the sea in agricultural planting, and prevents others from simulating and imitating the whole algorithm process by bypassing the protection of a single algorithm process. BRIEF DESCRIPTION OF DRAWINGS

[0035] The accompanying drawings, which form a part of this implementation, are used to provide a further understanding of the implementation, and the schematic implementation and its description of the implementation are used to explain the implementation, and do not constitute an improper limitation on the implementation.

[0036] Figure 1 The flowchart of the calculation method for quantifying the spatial amount of total nitrogen surface source pollution into the sea in agricultural planting in the first implementation of the present application is shown in FIG.

[0037] Figure 2 The architecture diagram of the calculation method of the spatial quantity of the total nitrogen non-point source pollution into the sea in the agricultural planting of the embodiment one of the present application is shown in the figure.

[0038] Figure 3 The flow chart of the construction of the non-point source pollution migration minimum cumulative resistance model (NPS-MCR) in the embodiment one of the present application is shown in the figure.

[0039] Figure 4 The index diagram of the total nitrogen non-point source pollution migration capacity in the agricultural planting in the embodiment one of the present application is shown in the figure.

[0040] Figure 5 The diagram of the total nitrogen non-point source pollution migration coefficient in the agricultural planting in the embodiment one of the present application is shown in the figure.

[0041] Figure 6 The diagram of the total nitrogen non-point source pollution into the sea in the agricultural planting in the embodiment one of the present application is shown in the figure.

[0042] Figure 7 The structure block diagram of the calculation system of the spatial quantity of the total nitrogen non-point source pollution into the sea in the agricultural planting in the embodiment two of the present application is shown in the figure. DETAILED DESCRIPTION

[0043] The present application will be further described below in conjunction with the drawings and embodiments.

[0044] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application pertains.

[0045] It should be noted that the terms used herein are only for the purpose of describing the specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0046] In the present application, the terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only a relationship word determined for the convenience of describing the structural relationship of the components or elements of the present application, and cannot be understood as a limitation on the present application.

[0047] In the present application, terms such as "fixedly connected", "connected", "connected" and the like should be broadly understood, which can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant scientific or technical personnel in the art, the specific meaning of the above terms in the present application can be determined according to the specific circumstances, and cannot be understood as a limitation on the present application.

[0048] In the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0049] Embodiment one

[0050] The embodiment one of the present application introduces a calculation method for quantifying the spatial amount of total nitrogen surface pollution from agricultural planting into the sea.

[0051] The existing research on total nitrogen surface pollution from agricultural planting into the sea often focuses on the total nitrogen surface pollution loss from agricultural planting into the sea at a certain stage of the whole process, and finally calculates the total nitrogen surface pollution into the sea. The amount is not accurate to each agricultural planting unit at the spatial scale, it is difficult to understand the specific total nitrogen loss and finally into the sea of the agricultural planting unit at the spatial scale, and it is impossible to provide operational decision support for precise prevention and control of total nitrogen surface pollution from agricultural planting. Therefore, the present embodiment proposes a calculation method for quantifying the spatial amount of total nitrogen surface pollution from agricultural planting into the sea as shown in Figure 1 and Figure 2 The calculation method for quantifying the spatial amount of total nitrogen surface pollution from agricultural planting into the sea comprises the following steps:

[0052] Obtain the total nitrogen pollution output coefficient of each agricultural planting unit;

[0053] Calculate the total nitrogen surface pollution transport capacity index of agricultural planting based on the minimum cumulative resistance model of surface pollution migration;

[0054] According to the monitoring data of the estuary, the actual total nitrogen surface pollution into the sea value of agricultural planting is calculated, and the potential total nitrogen surface pollution into the sea value of agricultural planting is calculated by combining the total nitrogen surface pollution output coefficient of the agricultural planting unit and the total nitrogen surface pollution transport capacity index of agricultural planting, to obtain the total nitrogen surface pollution into the sea value correction coefficient of agricultural planting; according to the total nitrogen surface pollution into the sea value correction coefficient of agricultural planting obtained and the total nitrogen surface pollution transport capacity index of agricultural planting obtained, the total nitrogen surface pollution transport coefficient of agricultural planting is obtained;

[0055] According to the total nitrogen surface pollution transport coefficient of agricultural planting obtained and the total nitrogen pollution output coefficient of each agricultural planting unit, the total nitrogen surface pollution into the sea value of the agricultural planting unit at the spatial scale is calculated, and the spatial quantification calculation of the total nitrogen surface pollution from agricultural planting into the sea is completed.

[0056] The total nitrogen pollution output coefficient of each agricultural planting unit is obtained by referring to relevant references and pollution coefficient manuals. In this embodiment, the total nitrogen pollution output coefficient of the jth agricultural planting unit is denoted as E j .

[0057] In this embodiment, the total nitrogen non-point source pollution transport capacity index of agricultural planting is calculated based on the non-point source pollution transport minimum cumulative resistance model (NPS-MCR). Specifically,

[0058] (1) The non-point source pollution transport minimum cumulative resistance model (NPS-MCR) shown in FIG. 1 is used to calculate the minimum cumulative resistance value of the research area. Specifically, Figure 3

[0059] ① Construct the basic resistance surface

[0060] The non-point source pollution diffusion migration influencing factors, i.e., the slope coefficient, the vegetation coverage coefficient, the soil erodibility coefficient, the rainfall erosivity coefficient, and the terrain wetness index, are weighted and summed according to the spatial standard deviation to construct the basic resistance surface of the research area.

[0061] ② Calculate the minimum cumulative resistance value

[0062] The basic resistance surface, the digital elevation model (DEM) data, and the water system data are input into the NPS-MCR to calculate the minimum cumulative resistance value of the research area.

[0063] It should be noted that the DEM data is used to control the migration direction of the total nitrogen substance, which can only migrate from high to low.

[0064] (2) The total nitrogen non-point source pollution transport capacity index of agricultural planting in the research area is calculated according to the minimum cumulative resistance value, i.e., wherein T is the transport capacity index; R is the minimum cumulative resistance value of the research area, which is calculated by the NPS-MCR model; R max and R min are the maximum and minimum values of the minimum cumulative resistance value.

[0065] It should be noted that the basic resistance surface is obtained by weighted raster calculation of the non-point source pollution diffusion migration influencing factors. Each non-point source pollution diffusion migration influencing factor has a corresponding calculation formula. By substituting the DEM data, NDVI data, slope data, soil texture data, and rainfall data of the research area into the corresponding formula, the slope coefficient, vegetation coverage coefficient, soil erodibility coefficient, rainfall erosivity coefficient, and terrain wetness index can be obtained. These belong to the prior art known to those skilled in the art, and will not be described here.

[0066] ​In the embodiment, the total nitrogen output by the agricultural planting unit migrates on the land surface until it enters the water system. During the migration on the land surface, there are multiple paths. The sum of the resistance values (i.e., the grid values of the basic resistance surface) of each path passing through the agricultural planting unit is calculated, the path with the minimum resistance is found, which is the minimum resistance path of the total nitrogen migrating to the water system, and the resistance value of the minimum resistance path is assigned to the agricultural planting unit to obtain the minimum cumulative resistance value. Each agricultural planting unit has a minimum resistance value, and the smallest minimum resistance value is R min , and the largest is R max .

[0067] In the embodiment, the monitoring data of the estuary at least includes the total nitrogen pollutant concentration of the estuary, the net flow at the estuary, and the monitoring time; the actual total nitrogen surface source pollution into the sea value Q of the agricultural planting is wherein n is the total number of estuaries; i is the i-th estuary; Q i is the total nitrogen surface source pollution into the sea of the i-th estuary, and Q i = c i R i t, c i is the total nitrogen pollutant concentration of the i-th estuary, R i is the runoff of the i-th estuary, t is the monitoring time; r ansp is the proportion of the total nitrogen pollution into the sea from agriculture; r sl is the proportion of the total nitrogen surface source pollution caused by crop output; and r rain is the annual proportion of rainfall in the monitoring time period of the study area.

[0068] In the embodiment, the potential total nitrogen surface source pollution into the sea value Q * of the agricultural planting is wherein m is the total number of agricultural planting units; j is the j-th agricultural planting unit; E j is the total nitrogen pollution output coefficient of the j-th agricultural planting unit; T j is the total nitrogen surface source pollution transport capacity index of the j-th agricultural planting unit; and s is the area of each agricultural planting unit (in the embodiment, the size of each agricultural planting unit is taken as 30m x 30m, i.e., the area s of each agricultural planting unit is 900m 2 ).

[0069] In the embodiment, the total nitrogen surface source pollution transport coefficient T * of the agricultural planting is T * = ηT; wherein η is the total nitrogen surface source pollution into the sea correction coefficient of the agricultural planting, i.e., T is the total nitrogen surface source pollution transport capacity index of the agricultural planting.

[0070] In the embodiment, the total nitrogen surface source pollution into sea amount of the agricultural planting unit in the spatial scale is the total nitrogen surface source pollution into sea amount of the agricultural planting unit, that is, the total nitrogen surface source pollution into sea amount q of the jth agricultural planting unit j For Wherein, E j is the total nitrogen pollution output coefficient of the jth agricultural planting unit; is the total nitrogen surface source pollution transport coefficient of the jth agricultural planting unit; s is the area of each agricultural planting unit (in the embodiment, the size of each agricultural planting unit is taken as 30m*30m, that is, the area s of each agricultural planting unit is 900m 2 ).

[0071] Example analysis

[0072] The embodiment is described in detail in combination with the agricultural planting land of a Yellow River Delta.

[0073] In the embodiment, the total nitrogen pollution output coefficient of five kinds of agricultural planting units is obtained by referring to the literature and pollution coefficient manual as shown in Table 1.

[0074] Table 1 Total nitrogen pollution output coefficient of various agricultural planting units

[0075]

[0076] In the embodiment, the slope coefficient, vegetation coverage coefficient, soil erodibility coefficient, rainfall erosion force coefficient and terrain humidity index are combined to construct the basic resistance surface of the research area; the DEM data and water system data are combined to obtain the minimum cumulative resistance value of the research area; and the total nitrogen surface source pollution transport capacity index of the agricultural planting of the research area is obtained as shown in Table 2. Figure 4

[0077] In the embodiment, the actual total nitrogen surface source pollution into sea amount of the agricultural planting is calculated according to the hydrological and water quality monitoring data of June to September obtained by monitoring the 9 estuaries of the research area; the potential total nitrogen surface source pollution into sea amount of the agricultural planting is calculated by using the total nitrogen pollution output coefficient of each agricultural planting unit and the total nitrogen surface source pollution transport capacity index of the agricultural planting; the correction coefficient is calculated according to the two results (the correction coefficient in the embodiment is 0.83); and the total nitrogen surface source pollution transport coefficient of the agricultural planting is obtained by correcting the total nitrogen surface source pollution transport capacity index of the agricultural planting with the correction coefficient as shown in Table 3. Figure 5

[0078] The total nitrogen surface source pollution into sea amount of the agricultural planting in the spatial scale of the research area is finally calculated by using the total nitrogen pollution output coefficient of each agricultural planting unit and the total nitrogen surface source pollution transport coefficient of the agricultural planting as shown in Table 4. Figure 6

[0079] ​​​This embodiment calculates and simulates the entire process of total nitrogen non-point source pollution from agricultural planting, from source output to diffusion and migration, and finally to the entry of total nitrogen non-point source pollution into the sea. It is then corrected by monitoring data of total nitrogen non-point source pollution from agricultural planting into the sea, so as to obtain the amount of total nitrogen pollution lost from agricultural planting units and eventually flowing into the ocean on a spatial scale.

[0080] This embodiment obtains the total nitrogen pollution output coefficient of agricultural planting units, calculates the transport capacity index of total nitrogen non-point source pollution from agricultural planting using the minimum cumulative resistance model for non-point source pollution migration (NPS-MCR), and corrects the transport capacity index by combining the hydrological and water quality monitoring data of the estuary, thus obtaining the transport coefficient of total nitrogen non-point source pollution from agricultural planting. Using the total nitrogen pollution output coefficient and the transport coefficient of total nitrogen non-point source pollution from agricultural planting units, the amount of total nitrogen non-point source pollution entering the sea from agricultural planting units at the spatial scale is obtained, ultimately realizing the spatial quantification of the amount of total nitrogen non-point source pollution entering the sea from agricultural planting.

[0081] This embodiment presents a complete process, from obtaining the total nitrogen pollution output value from agricultural planting, to simulating the diffusion and migration of total nitrogen non-point source pollution, and then to calculating the amount of total nitrogen non-point source pollution entering the sea; it ensures the technological innovation and application uniqueness in the field of spatial quantitative calculation of total nitrogen non-point source pollution entering the sea from agricultural planting, and prevents others from bypassing the protection of the single algorithm process to imitate and replicate the entire algorithm process.

[0082] Example 2

[0083] Embodiment 2 of the present invention introduces a calculation system for spatial quantification of total nitrogen non-point source pollution entering the sea from agricultural planting.

[0084] like Figure 7 The system shown is a calculation system for spatial quantification of total nitrogen non-point source pollution entering the sea from agricultural planting, comprising:

[0085] The acquisition module is configured to acquire the total nitrogen pollution output coefficient for each agricultural planting unit;

[0086] The first calculation module is configured to calculate the agricultural crop total nitrogen non-point source pollution transport capacity index based on the minimum cumulative resistance model for non-point source pollutant migration.

[0087] The second calculation module is configured to calculate the actual value of total nitrogen non-point source pollution from agricultural planting entering the sea based on the estuary monitoring data, and to calculate the potential value of total nitrogen non-point source pollution from agricultural planting entering the sea by combining the total nitrogen non-point source pollution output coefficient and the transport capacity index of agricultural planting units, thereby obtaining the correction coefficient for the amount of total nitrogen non-point source pollution entering the sea from agricultural planting; and to obtain the transport coefficient for total nitrogen non-point source pollution from agricultural planting based on the obtained correction coefficient for the amount of total nitrogen non-point source pollution entering the sea from agricultural planting and the obtained transport capacity index of total nitrogen non-point source pollution from agricultural planting.

[0088] a spatial quantification module configured to calculate the total nitrogen non-point source pollution input into sea of the agricultural planting unit at a spatial scale according to the obtained total nitrogen non-point source pollution transport coefficient of the agricultural planting and the total nitrogen pollution output coefficient of each agricultural planting unit, and complete the spatial quantification calculation of the total nitrogen non-point source pollution input into sea of the agricultural planting.

[0089] The detailed steps are the same as the calculation method of the spatial quantification of the total nitrogen non-point source pollution input into sea of the agricultural planting provided in Embodiment 1, and will not be repeated here.

[0090] Embodiment 3

[0091] The embodiment 3 of the present application provides a computer readable storage medium.

[0092] A computer readable storage medium has a program stored thereon, and the program is executed by a processor to implement the steps in the calculation method of the spatial quantification of the total nitrogen non-point source pollution input into sea of the agricultural planting provided in Embodiment 1 of the present application.

[0093] The detailed steps are the same as the calculation method of the spatial quantification of the total nitrogen non-point source pollution input into sea of the agricultural planting provided in Embodiment 1, and will not be repeated here.

[0094] Embodiment 4

[0095] The embodiment 4 of the present application provides an electronic device.

[0096] An electronic device includes a memory, a processor, and a program stored in the memory and running on the processor, and the processor executes the program to implement the steps in the calculation method of the spatial quantification of the total nitrogen non-point source pollution input into sea of the agricultural planting provided in Embodiment 1 of the present application.

[0097] The detailed steps are the same as the calculation method of the spatial quantification of the total nitrogen non-point source pollution input into sea of the agricultural planting provided in Embodiment 1, and will not be repeated here.

[0098] Embodiment 5

[0099] The embodiment 5 of the present application provides a computer program product.

[0100] A computer program product includes software code, and the program in the software code executes the steps in the calculation method of the spatial quantification of the total nitrogen non-point source pollution input into sea of the agricultural planting provided in Embodiment 1 of the present application.

[0101] The detailed steps are the same as the calculation method of the spatial quantification of the total nitrogen non-point source pollution input into sea of the agricultural planting provided in Embodiment 1, and will not be repeated here.

[0102] Those skilled in the art will appreciate that embodiments of the present application can be readily used as software, hardware, or a combination of software and hardware. In a software embodiment, the methods can be tangibly embodied in a machine-readable storage medium having stored thereon instructions that can be used to program a computer to perform any of the methods. The software implementation can be initialized by loading and executing a set of instructions arranged to perform one of the methods into the computer's memory. Alternatively, hard-wired circuitry can be used in place of, or in combination with, software instructions. Thus, the

[0103] The present application is described in reference to the flowchart illustrations and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in one or more of the flowchart illustrations and / or block diagrams. Figure 1 means for performing each of the one or more functions specified in the flowchart illustrations and / or block diagrams.

[0104] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in one or more of the flowchart illustrations and / or block diagrams. Figure 1 means for performing each of the one or more functions specified in the flowchart illustrations and / or block diagrams.

[0105] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in one or more of the flowchart illustrations and / or block diagrams. Figure 1 means for performing each of the one or more functions specified in the flowchart illustrations and / or block diagrams.

[0106] While preferred embodiments of the application have been described, modifications and variations can be apparent to those skilled in the art once aware of the general underlying concepts. Accordingly, the appended claims are intended to encompass all modifications and variations as falling within the scope of the application.

[0107] Obviously, various modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the present application. Thus, it is intended that the present application encompass such modifications and changes as fall within the scope of the claims and their equivalents.

[0108] The above description is merely that of the preferred embodiments of the present application, and is not intended to limit the present application. The present application can be variously changed and modified by those skilled in the art without departing from the spirit and scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the present application.

Claims

1. A method for calculating the spatial quantity of total nitrogen from agricultural planting non-point source pollution into the sea, characterized in that, The method comprises the following steps: obtaining a total nitrogen pollution output coefficient of each agricultural planting unit; calculating an agricultural planting total nitrogen non-point source pollution transport capacity index based on a non-point source pollution transport minimum cumulative resistance model; calculating an agricultural planting total nitrogen non-point source pollution actual sea input value based on monitoring data of an estuary, and combining the agricultural planting total nitrogen non-point source pollution output coefficient and the transport capacity index to obtain an agricultural planting total nitrogen non-point source pollution potential sea input value, thereby obtaining an agricultural planting total nitrogen non-point source pollution sea input correction coefficient; and obtaining an agricultural planting total nitrogen non-point source pollution transport coefficient based on the agricultural planting total nitrogen non-point source pollution sea input correction coefficient and the transport capacity index; calculating the agricultural planting total nitrogen non-point source pollution sea input amount at a spatial scale based on the agricultural planting total nitrogen non-point source pollution transport coefficient and the total nitrogen pollution output coefficient of each agricultural planting unit, thereby completing the spatial quantification calculation of the agricultural planting total nitrogen non-point source pollution sea input.

2. The method for quantifying the spatial amount of total nitrogen of agricultural planting non-point source pollution into sea according to claim 1, characterized in that, The monitoring data of the estuary includes at least concentration of total nitrogen pollutants at the estuary, net flow at the estuary and monitoring time; the actual total nitrogen pollution value Q of the agricultural planting total nitrogen area source into the sea is Wherein, n is the total number of estuaries; i is the i-th estuary; Q i is the total nitrogen pollution into the sea of the i-th estuary, and Q i = c i R i t, c i is the concentration of total nitrogen pollutants of the i-th estuary, R i is the runoff of the i-th estuary, t is the monitoring time; r ansp is the proportion of total nitrogen pollution into the sea from agriculture; r sl is the proportion of total nitrogen area source pollution caused by crop output; r rain is the annual proportion of rainfall in the monitoring time period of the study area.

3. The method for quantifying the spatial amount of total nitrogen of agricultural planting non-point source pollution into sea according to claim 2, characterized in that, The potential sea entry value Q of total nitrogen non-point source pollution of the agricultural planting * For Wherein, m is the total number of agricultural planting units; j is the jth agricultural planting unit; E j is the total nitrogen pollution output coefficient of the jth agricultural planting unit; T j is the total nitrogen non-point source pollution transport capacity index of the jth agricultural planting unit; s is the area of each agricultural planting unit.

4. The method for quantifying the spatial amount of total nitrogen of agricultural planting non-point source pollution into sea according to claim 3, characterized in that, The agricultural planting total nitrogen non-point source pollution transport coefficient T * is T * = ηT; wherein, η is the agricultural planting total nitrogen non-point source pollution into the sea amount correction coefficient, that is T is the agricultural planting total nitrogen non-point source pollution transport capacity index.

5. The method for quantifying the spatial amount of total nitrogen of agricultural planting non-point source pollution into sea according to claim 1, characterized in that, The total nitrogen surface source pollution into the sea amount of the agricultural planting unit in the spatial scale is the total nitrogen surface source pollution into the sea amount of the agricultural planting unit, that is, the total nitrogen surface source pollution into the sea amount q of the jth agricultural planting unit j For Wherein, E j is the total nitrogen pollution output coefficient of the jth agricultural planting unit; is the total nitrogen surface source pollution transport coefficient of the jth agricultural planting unit; and s is the area of each agricultural planting unit.

6. The method for quantifying the spatial amount of total nitrogen of agricultural planting non-point source pollution into sea according to claim 1, characterized in that, The non-point source pollution transport minimum cumulative resistance model is used to calculate a minimum cumulative resistance value, and the agricultural planting total nitrogen non-point source pollution transport capacity index is calculated based on the minimum cumulative resistance value. The non-point source pollution transport minimum cumulative resistance model is at least related to a non-point source pollution diffusion migration influence factor.

7. An agricultural planting total nitrogen non-point source pollution into the sea space quantification calculation system, characterized by, The method comprises the following steps: a obtaining module configured to obtain a total nitrogen pollution output coefficient of each agricultural planting unit; a first calculating module configured to calculate an agricultural planting total nitrogen non-point source pollution transport capacity index based on a non-point source pollution transport minimum cumulative resistance model; a second calculating module configured to calculate an agricultural planting total nitrogen non-point source pollution actual sea input value based on monitoring data of an estuary, and combine the agricultural planting total nitrogen non-point source pollution output coefficient and the transport capacity index to obtain an agricultural planting total nitrogen non-point source pollution potential sea input value, thereby obtaining an agricultural planting total nitrogen non-point source pollution sea input correction coefficient; and obtain an agricultural planting total nitrogen non-point source pollution transport coefficient based on the agricultural planting total nitrogen non-point source pollution sea input correction coefficient and the transport capacity index; a spatial quantification module configured to calculate the agricultural planting total nitrogen non-point source pollution sea input amount at a spatial scale based on the agricultural planting total nitrogen non-point source pollution transport coefficient and the total nitrogen pollution output coefficient of each agricultural planting unit, thereby completing the spatial quantification calculation of the agricultural planting total nitrogen non-point source pollution sea input.

8. A computer-readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to realize the steps of the agricultural planting total nitrogen non-point source pollution sea input spatial quantification calculation method according to any one of claims 1-6.

9. An electronic device comprising a memory, a processor, and a computer program stored on the memory and running on the processor, characterized in that, The processor executes the program to realize the steps of the agricultural planting total nitrogen non-point source pollution sea input spatial quantification calculation method according to any one of claims 1-6.

10. A computer program product comprising software code, characterized in that, The program in the software code executes the steps of the agricultural planting total nitrogen non-point source pollution sea input spatial quantification calculation method according to any one of claims 1-6.

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