Calculation method and system for agricultural planting total nitrogen non-point source pollution sea-entering space quantification

Abstract

The invention belongs to the technical field of agricultural planting total nitrogen non-point source pollution sea entering, and particularly relates to an agricultural planting total nitrogen non-point source pollution sea entering space quantification calculation method and system, and the method comprises the steps: obtaining a total nitrogen pollution output coefficient of each agricultural planting unit; calculating an agricultural planting total nitrogen non-point source pollution transport capability index based on a non-point source pollutant migration minimum cumulative resistance model; according to the estuary monitoring data, calculating an agricultural planting total nitrogen non-point source pollution actual in-sea value, an agricultural planting total nitrogen non-point source pollution in-mass correction coefficient and an agricultural planting total nitrogen non-point source pollution transport coefficient; and according to the obtained agricultural planting total nitrogen non-point source pollution transport coefficient and the total nitrogen pollution output coefficient of each agricultural planting unit, calculating the total nitrogen non-point source pollution entering amount of the agricultural planting units on the spatial scale, and completing the spatial quantization calculation of the agricultural planting total nitrogen non-point source pollution entering the sea.

Description

Technical Field

[0001] The present invention belongs to the technical field of total nitrogen non-point source pollution from agricultural planting into the sea, and particularly relates to a calculation method and system for quantifying the space of total nitrogen non-point source pollution from agricultural planting into the sea. Background Technique

[0002] The statements in this part only provide background technical information related to the present invention, and do not necessarily constitute prior art.

[0003] Total nitrogen non-point source pollution from agricultural planting into the sea is one of the main threat factors affecting the ecological environment of coastal waters. With the intensive development of agricultural production, the extensive use of chemical fertilizers and pesticides has exacerbated nitrogen loss, resulting in a large amount of nitrogen pollutants entering rivers through runoff and ultimately flowing into the ocean, triggering a series of ecological environment problems such as eutrophication of coastal waters and algal blooms. Therefore, accurately assessing the situation of total nitrogen non-point source pollution from agriculture entering the sea has become an urgent problem to be solved in current research and practice.

[0004] Total nitrogen non-point source pollution from agricultural planting is widely and dispersedly sourced, and the diffusion process is complex. During the migration process, it will be affected by many aspects such as land use, natural environment, and climate conditions, resulting in difficulty in quantifying and evaluating the total nitrogen pollution amount from the source emission to the final entry into the ocean.

[0005] Currently, the main methods for analyzing and evaluating total nitrogen non-point source pollution from agricultural planting into the sea are the cross-section monitoring method and the model simulation method. The cross-section monitoring method is to set up multiple hydrological and water quality monitoring stations at key points or estuaries of the rivers flowing into the sea in coastal areas, collect water samples from different cross-sections of the rivers, and take them to the laboratory for chemical analysis and detection to obtain the hydrological and water quality data of the rivers. Through long-term monitoring, based on the hydrological and water quality data of the rivers flowing into the sea, the total amount of total nitrogen non-point source pollution generated by agricultural land, diffused and migrated through surface runoff, and finally flowing into the ocean through the rivers flowing into the sea is obtained by using a scientific and reasonable calculation method. The model simulation method is to use environmental simulation models (such as SWAT model, IMAGE-GNM model, etc.) to simulate the process of total nitrogen non-point source pollution from agricultural planting into the sea in the study area. By inputting data parameters such as meteorology, topography, and land use to drive the model to run, the hydrological process in the basin is simulated based on the rainfall-runoff relationship, and according to the total nitrogen loss of agricultural planting crops, the total nitrogen flux of total nitrogen non-point source pollution flowing into the river and then into the ocean through surface runoff and other channels is calculated.

[0006] The prior art does not systematically connect the entire process of agricultural total nitrogen non-point source pollution, including agricultural pollution source emissions, the diffusion and migration of total nitrogen non-point source pollution, and the ultimate entry of total nitrogen pollution into the sea; it mainly focuses on a certain key node in the process of agricultural total nitrogen non-point source pollution entering the sea. For example, cross-section monitoring mainly relies on monitoring data to count the amount of agricultural total nitrogen non-point source pollution entering the sea; while the model simulation method focuses on the diffusion and migration process of agricultural total nitrogen non-point source pollution. None of the above methods conduct systematic comprehensive research; therefore, the prior art cannot accurately quantify agricultural total nitrogen non-point source pollution at the spatial scale. The existing technical solutions and calculation methods mainly focus on the overall situation of agricultural total nitrogen non-point source pollution entering the sea, lacking research and calculation methods for the situation of total nitrogen pollution in agricultural planting units entering the sea at the spatial scale. Summary of the Invention

[0007] To solve the above problems, the present invention proposes a calculation method and system for quantifying the spatial entry of agricultural total nitrogen non-point source pollution into the sea. Based on the entire process of agricultural total nitrogen non-point source pollution from its source, surface diffusion and migration, and finally flowing into the sea via the estuary, it calculates the final amount of total nitrogen non-point source pollution entering the sea for each agricultural planting unit at the spatial scale, providing decision-making support for the prevention and control of agricultural total nitrogen non-point source pollution entering the sea.

[0008] According to some embodiments, the first solution of the present invention provides a calculation method for quantifying the spatial entry of agricultural total nitrogen non-point source pollution into the sea, adopting the following technical solutions:

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

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

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

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

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

[0014] As a further technical limitation, the estuary monitoring data at least includes the total nitrogen pollutant concentration at the estuary, the net flow at the estuary and the monitoring time; the actual value of the 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 is the total nitrogen pollution from land into the sea at the i-th estuary, and Q i =c i R i t,c i is the total nitrogen pollutant concentration at the ith estuary, R i is the runoff of the ith estuary, t is the monitoring time; r ansp is the proportion of total nitrogen pollution discharged into the ocean from agriculture; sl is the proportion of total nitrogen non-point source pollution caused by crop output; r rain It is the percentage of annual rainfall in the monitoring period of the study area.

[0015] Furthermore, the potential value of total nitrogen non-point source pollution from agricultural planting into the sea is Q * for Where 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 transfer capacity index of the jth agricultural planting unit; s is the area of ​​each agricultural planting unit.

[0016] Furthermore, the agricultural planting total nitrogen non-point source pollution transfer coefficient T * T * =ηT; where η is the correction coefficient for the amount of total nitrogen pollution entering the sea from agricultural planting, that is, T is the transfer capacity index of total nitrogen non-point source pollution from agricultural planting.

[0017] As a further technical definition, the total nitrogen non-point source pollution entering the sea from the agricultural planting unit on the spatial scale is the total nitrogen non-point source pollution entering the sea from the agricultural planting unit, that is, the total nitrogen non-point source pollution entering the sea from the jth agricultural planting unit q j for Among them, E j is the total nitrogen pollution output coefficient of the jth agricultural planting unit; is the total nitrogen non-point source pollution transfer coefficient of the jth agricultural planting unit; s is the area of ​​each agricultural planting unit.

[0018] As a further technical limitation, the minimum cumulative resistance model of non-point source pollutant migration is used to calculate the minimum cumulative resistance value, and the total nitrogen non-point source pollution transport capacity index of agricultural planting is calculated according to the obtained minimum cumulative resistance value; the minimum cumulative resistance model of non-point source pollutant migration is at least related to the influencing factors of non-point source pollution diffusion and migration.

[0019] According to some embodiments, the second solution of the present invention provides a calculation system for quantifying the sea-entry space of total nitrogen non-point source pollution in agricultural planting, and the following technical solutions are adopted:

[0020] A calculation system for quantifying the sea-entry space of total nitrogen non-point source pollution in agricultural planting, comprising:

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

[0022] A first calculation module configured to calculate 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;

[0023] A second calculation module configured to calculate the actual sea-entry value of total nitrogen non-point source pollution in agricultural planting according to the monitoring data at the estuary, and obtain the correction coefficient of the total nitrogen non-point source pollution sea-entry volume by combining the total nitrogen non-point source pollution output coefficient and the transport capacity index of the agricultural planting unit; according to the obtained correction coefficient of the total nitrogen non-point source pollution sea-entry volume and the obtained total nitrogen non-point source pollution transport capacity index of agricultural planting, obtain the total nitrogen non-point source pollution transport coefficient of agricultural planting;

[0024] A space quantification module configured to calculate the total nitrogen non-point source pollution sea-entry volume of agricultural planting units at the spatial scale according to the obtained total nitrogen non-point source pollution transport coefficient of 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 sea-entry in agricultural planting.

[0025] According to some embodiments, the third solution of the present invention provides a computer-readable storage medium, and the following technical solutions are adopted:

[0026] A computer-readable storage medium, on which a program is stored, and when the program is executed by a processor, the steps in the calculation method for quantifying the sea-entry space of total nitrogen non-point source pollution in agricultural planting as described in the first solution of the present invention are implemented.

[0027] According to some embodiments, the fourth solution of the present invention provides an electronic device, and the following technical solutions are adopted:

[0028] An electronic device includes a memory, a processor, and a program stored on the memory and running on the processor. When the processor executes the program, it implements the steps in the calculation method for quantifying the spatial extent of total nitrogen non-point source pollution from agricultural planting into the sea as described in the first solution of the present invention.

[0029] According to some embodiments, a fifth solution of the present invention provides a computer program product, adopting the following technical solution:

[0030] A computer program product includes software code, and the program in the software code executes the steps in the calculation method for quantifying the spatial extent of total nitrogen non-point source pollution from agricultural planting into the sea as described in the first solution of the present invention.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] In the present invention, when studying the total nitrogen non-point source pollution from agricultural planting into the sea, it conducts a full-process calculation simulation from the source output, through the diffusion and migration process of total nitrogen non-point source pollution, to the situation of total nitrogen non-point source pollution entering the sea, and corrects it in combination with the monitoring data of total nitrogen non-point source pollution from agricultural planting into the sea, so as to obtain the total nitrogen pollution amount lost from agricultural planting units and finally flowing into the sea at the spatial scale.

[0033] The present invention 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 by using the minimum cumulative resistance model for non-point source pollutant migration (NPS-MCR), corrects the transport capacity index in combination with the hydrological and water quality monitoring data at the estuary, and then obtains the transport coefficient of total nitrogen non-point source pollution from agricultural planting; uses the total nitrogen pollution output coefficient of agricultural planting units and the transport coefficient of total nitrogen non-point source pollution from agricultural planting to obtain the amount of total nitrogen non-point source pollution entering the sea from agricultural planting units at the spatial scale, and finally realizes the spatial quantification of the amount of total nitrogen non-point source pollution from agricultural planting entering the sea.

[0034] The present invention provides a complete process from obtaining the total nitrogen pollution output value of agricultural planting units, through the process simulation of the diffusion and migration of total nitrogen non-point source pollution, to the calculation of the amount of total nitrogen non-point source pollution entering the sea; ensures the technological innovation and application uniqueness in the field of spatial quantification calculation of total nitrogen non-point source pollution from agricultural planting into the sea, and prevents others from imitating and counterfeiting the entire algorithm process by bypassing the protection of a single algorithm process. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings forming a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments and descriptions thereof are used to explain this embodiment and do not constitute an improper limitation of this embodiment.

[0036] Figure 1 It is a flowchart of the calculation method for quantifying the spatial extent of total nitrogen non-point source pollution from agricultural planting into the sea in the first embodiment of the present invention;

[0037] Figure 2 It is the architecture diagram of the calculation method for quantifying the spatial input of total nitrogen non-point source pollution in agricultural planting in Embodiment 1 of the present invention;

[0038] Figure 3 It is the construction flow chart of the non-point source pollutant migration minimum cumulative resistance model (NPS-MCR) in Embodiment 1 of the present invention;

[0039] Figure 4 It is the schematic diagram of the transport capacity index of total nitrogen non-point source pollution in agricultural planting in Embodiment 1 of the present invention;

[0040] Figure 5 It is the schematic diagram of the transport coefficient of total nitrogen non-point source pollution in agricultural planting in Embodiment 1 of the present invention;

[0041] Figure 6 It is the schematic diagram of the input quantity of total nitrogen non-point source pollution in agricultural planting in Embodiment 1 of the present invention;

[0042] Figure 7 It is the structural block diagram of the calculation system for quantifying the spatial input of total nitrogen non-point source pollution in agricultural planting in Embodiment 2 of the present invention. Detailed implementation manners

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

[0044] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanations of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

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

[0046] In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only relationship terms determined for the convenience of describing the structural relationship of each component or element of the present invention and do not specifically refer to any component or element of the present invention and should not be construed as a limitation of the present invention.

[0047] In the present invention, terms such as "fixed connection", "connected", "connected to" should be understood in a broad sense, which may mean a fixed connection, an integral connection or a detachable connection; it may be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present invention can be determined according to specific circumstances, and it should not be construed as a limitation to the present invention.

[0048] Without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0049] Embodiment 1

[0050] Embodiment 1 of the present invention introduces a calculation method for quantifying the spatial pollution of total nitrogen from agricultural planting into the sea.

[0051] Existing studies on the total nitrogen non-point source pollution from agricultural planting into the sea often focus on a certain stage in the whole process of the total nitrogen non-point source pollution from agricultural planting flowing into the sea. Finally, the calculated total amount of total nitrogen non-point source pollution entering the sea is the overall value, without being accurate to each agricultural planting unit at the spatial scale. It is difficult to understand the specific total nitrogen loss of agricultural planting units at the spatial scale and the situation of finally flowing into the sea, and it is impossible to provide operable decision-making support for the precise prevention and control of total nitrogen non-point source pollution from agricultural planting. Therefore, this embodiment proposes a calculation method for quantifying the spatial pollution of total nitrogen from agricultural planting into the sea as shown in Figure 1 and Figure 2 , including:

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

[0053] Calculate the transport capacity index of total nitrogen non-point source pollution from agricultural planting based on the minimum cumulative resistance model of non-point source pollutant migration;

[0054] Calculate the actual value of total nitrogen non-point source pollution from agricultural planting entering the sea according to the monitoring data at the estuary, and obtain the correction coefficient of the total amount 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; obtain the transport coefficient of total nitrogen non-point source pollution from agricultural planting according to the obtained correction coefficient of the total amount of total nitrogen non-point source pollution from agricultural planting entering the sea and the obtained transport capacity index of total nitrogen non-point source pollution from agricultural planting;

[0055] Calculate the total amount of total nitrogen non-point source pollution from agricultural planting units at the spatial scale according to the obtained transport coefficient of total nitrogen non-point source pollution from agricultural planting and the total nitrogen pollution output coefficient of each agricultural planting unit, and complete the spatial quantification calculation of total nitrogen non-point source pollution from agricultural planting into the sea.

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

[0057] In this embodiment, the non-point source pollution transport capacity index of total nitrogen in agricultural planting is calculated using the non-point source pollutant migration minimum cumulative resistance model (NPS-MCR); specifically:

[0058] (1) Use the non-point source pollutant migration minimum cumulative resistance model (NPS-MCR), which includes constructing a basic resistance surface and calculating the minimum cumulative resistance value, to calculate the minimum cumulative resistance value of the study area; specifically: Figure 3 As shown, calculate the minimum cumulative resistance value of the study area using the non-point source pollutant migration minimum cumulative resistance model (NPS-MCR) that includes two parts: constructing a basic resistance surface and calculating the minimum cumulative resistance value; specifically:

[0059] ① Construct the basic resistance surface

[0060] Weighted sum the non-point source pollution diffusion and migration influencing factors: slope coefficient, vegetation coverage coefficient, soil erodibility coefficient, rainfall erosivity coefficient, and topographic wetness index according to the spatial standard deviation to construct the basic resistance surface of the study area;

[0061] ② Calculate the minimum cumulative resistance value

[0062] Input the basic resistance surface, digital elevation model (DEM) data, and water system data into NPS-MCR for calculation to obtain the minimum cumulative resistance value of the study area.

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

[0064] (2) Calculate the non-point source pollution transport capacity index of total nitrogen in agricultural planting in the study area according to the minimum cumulative resistance value result, that is where T is the transport capacity index; R is the minimum cumulative resistance value of the study area, obtained by calculating through 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 raster calculation and weighting according to the non-point source pollution diffusion and migration influencing factors; each non-point source pollution diffusion and migration influencing factor has a corresponding calculation formula. By substituting the DEM data, NDVI data, slope data, soil texture data, rainfall data, etc. of the study area into the corresponding formula, the slope coefficient, vegetation coverage coefficient, soil erodibility coefficient, rainfall erosivity coefficient, and topographic wetness index can be obtained. These are all prior arts that those skilled in the art should know and will not be elaborated here.

[0066] In this embodiment, the total nitrogen output by the agricultural planting unit diffuses and migrates on the land surface until it enters the water system. There are multiple paths during the diffusion and migration on the land surface. Calculate 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, and find the path with the minimum resistance. This is the minimum resistance path for the total nitrogen to migrate to the water system. Assign the resistance value of this minimum resistance path to the agricultural planting unit to obtain the minimum cumulative resistance value; each agricultural planting unit has a minimum resistance value, and the smallest of these minimum resistance values is R min , and the largest is R max .

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

[0068] In this embodiment, the potential sea - entry value Q * of the total nitrogen non - point source pollution from agricultural planting is where 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 non - point source pollution transport capacity index of the j - th agricultural planting unit; s is the area of each agricultural planting unit (in this 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 ).

[0069] In this embodiment, the total nitrogen non - point source pollution transport coefficient T * is T * = ηT; where η is the correction coefficient of the total nitrogen non - point source pollution sea - entry amount, that is T is the total nitrogen non - point source pollution transport capacity index.

[0070] In this embodiment, the total nitrogen non-point source pollution input amount at the spatial scale of the agricultural planting unit is the total nitrogen non-point source pollution input amount considering the agricultural planting unit, that is, the total nitrogen non-point source pollution input amount q of the j-th agricultural planting unit j is where E j is the total nitrogen pollution output coefficient of the j-th agricultural planting unit; is the total nitrogen non-point source pollution transport coefficient of the j-th agricultural planting unit; s is the area of each agricultural planting unit (in this 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 ²).

[0071] Case study

[0072] This embodiment is introduced in detail in combination with the agricultural planting land in a certain Yellow River Delta.

[0073] In this embodiment, by consulting the literature and the pollution coefficient manual, the total nitrogen pollution output coefficients of five agricultural planting units as shown in Table 1 are obtained.

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

[0075]

[0076] In this embodiment, by combining the slope coefficient, vegetation coverage coefficient, soil erodibility coefficient, rainfall erosivity coefficient and topographic wetness index, the basic resistance surface of the study area is constructed; by combining the DEM data and the water system data, the minimum cumulative resistance value of the study area is obtained; and further, the total nitrogen non-point source pollution transport capacity index of the agricultural planting in the study area as shown in Figure 4 is obtained.

[0077] In this embodiment, according to the hydrological and water quality monitoring data from June to September monitored at 9 estuaries in the study area, the actual input amount of total nitrogen non-point source pollution from agricultural planting is calculated; by using the total nitrogen pollution output coefficient of each agricultural planting unit and the total nitrogen non-point source pollution transport capacity index of agricultural planting, the potential input amount of total nitrogen non-point source pollution from agricultural planting is calculated; according to these two results, the correction coefficient (the correction coefficient in this embodiment is 0.83) is calculated; and then the total nitrogen non-point source pollution transport capacity index of agricultural planting is corrected by the correction coefficient, and the total nitrogen non-point source pollution transport coefficient of agricultural planting as shown in Figure 5 is obtained.

[0078] By using the total nitrogen pollution output coefficient of each agricultural planting unit and the total nitrogen non-point source pollution transport coefficient of agricultural planting, finally, the total nitrogen non-point source pollution input amount at the spatial scale of the study area as shown in Figure 6 is calculated.

[0079] In this embodiment, during the study of the total nitrogen non-point source pollution in agricultural planting, from the source output, to the diffusion and migration process of the total nitrogen non-point source pollution, and then to the calculation and simulation of the whole process of the total nitrogen non-point source pollution entering the sea, combined with the monitoring data of the total nitrogen non-point source pollution entering the sea in agricultural planting for correction, the total nitrogen pollution quantity lost by the agricultural planting unit at the spatial scale and finally flowing into the sea can be obtained.

[0080] In this embodiment, by obtaining the total nitrogen pollution output coefficient of the agricultural planting unit, using the minimum cumulative resistance model for non-point source pollutant migration (NPS-MCR) to calculate the transport capacity index of the total nitrogen non-point source pollution in agricultural planting, and combining the hydrological and water quality monitoring data at the estuary to correct the transport capacity index, the transport coefficient of the total nitrogen non-point source pollution in agricultural planting can be obtained; using the total nitrogen pollution output coefficient of each agricultural planting unit and the transport coefficient of the total nitrogen non-point source pollution in agricultural planting, the quantity of the total nitrogen non-point source pollution entering the sea of the agricultural planting unit at the spatial scale can be obtained, and finally the spatial quantification of the quantity of the total nitrogen non-point source pollution entering the sea in agricultural planting is realized.

[0081] This embodiment gives a complete process from obtaining the total nitrogen pollution output value in agricultural planting, to simulating the diffusion and migration process of the total nitrogen non-point source pollution, and then to calculating the quantity of the total nitrogen non-point source pollution entering the sea; ensuring the technological innovation and application uniqueness in the field of spatial quantification calculation of the total nitrogen non-point source pollution in agricultural planting entering the sea, and preventing others from imitating and copying the entire algorithm process by bypassing the protection of a single algorithm process.

[0082] Embodiment 2

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

[0084] As Figure 7 shown, a calculation system for spatial quantification of the total nitrogen non-point source pollution in agricultural planting entering the sea includes:

[0085] An acquisition module configured to acquire the total nitrogen pollution output coefficient of each agricultural planting unit;

[0086] A first calculation module configured to calculate the transport capacity index of the total nitrogen non-point source pollution in agricultural planting based on the minimum cumulative resistance model for non-point source pollutant migration;

[0087] A second calculation module configured to calculate the actual value of the total nitrogen non-point source pollution in agricultural planting entering the sea according to the monitoring data at the estuary, combine the potential value of the total nitrogen non-point source pollution in agricultural planting entering the sea calculated from the total nitrogen non-point source pollution output coefficient and the transport capacity index of the agricultural planting unit, and obtain the correction coefficient of the quantity of the total nitrogen non-point source pollution in agricultural planting entering the sea; according to the obtained correction coefficient of the quantity of the total nitrogen non-point source pollution in agricultural planting entering the sea and the obtained transport capacity index of the total nitrogen non-point source pollution in agricultural planting, obtain the transport coefficient of the total nitrogen non-point source pollution in agricultural planting;

[0088] A spatial quantification module, which is configured to calculate the total nitrogen non-point source pollution input amount of agricultural planting units at the spatial scale according to the obtained total nitrogen non-point source pollution transfer coefficient of 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 of agricultural planting into the sea.

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

[0090] Embodiment 3

[0091] Embodiment 3 of the present invention provides a computer-readable storage medium.

[0092] A computer-readable storage medium, on which a program is stored, and when the program is executed by a processor, it implements the steps in the calculation method for the spatial quantification of the total nitrogen non-point source pollution of agricultural planting as described in Embodiment 1 of the present invention.

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

[0094] Embodiment 4

[0095] Embodiment 4 of the present invention provides an electronic device.

[0096] An electronic device, including a memory, a processor, and a program stored on the memory and running on the processor. When the processor executes the program, it implements the steps in the calculation method for the spatial quantification of the total nitrogen non-point source pollution of agricultural planting as described in Embodiment 1 of the present invention.

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

[0098] Embodiment 5

[0099] Embodiment 5 of the present invention provides a computer program product.

[0100] A computer program product, including software code, and the program in the software code executes the steps in the calculation method for the spatial quantification of the total nitrogen non-point source pollution of agricultural planting as described in Embodiment 1 of the present invention.

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

[0102] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) that contain computer-usable program code. The solutions in the embodiments of the present invention can be implemented using various computer languages. For example, object-oriented programming languages such as Java and interpreted scripting languages such as JavaScript, etc.

[0103] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0104] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0105] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0106] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concepts. Therefore, the appended claims are intended to be construed as including the preferred embodiments as well as all changes and modifications that fall within the scope of the present invention.

[0107] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

[0108] The above are only the preferred embodiments of this example and are not used to limit this example. For those skilled in the art, this example can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this example shall be included within the protection scope of this example.

Claims

1. A calculation method for quantifying the spatial extent of total nitrogen non-point source pollution from agricultural planting entering the sea, characterized in that, Including: Obtaining the total nitrogen pollution output coefficient of each agricultural planting unit; Calculating the transfer capacity index of total nitrogen non-point source pollution in agricultural planting based on the minimum cumulative resistance model of non-point source pollutant migration; Calculating the actual sea-entry value of total nitrogen non-point source pollution in agricultural planting according to the monitoring data at the estuary, and obtaining the correction coefficient of the sea-entry amount of total nitrogen non-point source pollution in agricultural planting by combining the potential sea-entry value of total nitrogen non-point source pollution in agricultural planting units calculated from the total nitrogen non-point source pollution output coefficient and transfer capacity index of agricultural planting units; obtaining the transfer coefficient of total nitrogen non-point source pollution in agricultural planting according to the obtained correction coefficient of the sea-entry amount of total nitrogen non-point source pollution in agricultural planting and the obtained transfer capacity index of total nitrogen non-point source pollution in agricultural planting; Calculating the sea-entry amount of total nitrogen non-point source pollution of agricultural planting units at the spatial scale according to the obtained transfer coefficient of total nitrogen non-point source pollution in agricultural planting and the total nitrogen pollution output coefficient of each agricultural planting unit, and completing the spatial quantification calculation of the sea-entry of total nitrogen non-point source pollution in agricultural planting.

2. The calculation method for quantifying the spatial input of total nitrogen non-point source pollution from agricultural planting into the sea as described in claim 1, wherein The estuary monitoring data at least includes the total nitrogen pollutant concentration at the estuary, the net flow at the estuary, and the monitoring time; the actual value Q of the total nitrogen non-point source pollution from agricultural planting entering the sea is where n is the total number of estuaries; i is the i-th estuary; Q i is the amount of land-source total nitrogen pollution entering the sea at the i-th estuary, and Q i = c i R i t, c i is the total nitrogen pollutant concentration at the i-th estuary, R i is the runoff at the i-th estuary, t is the monitoring time; r ansp is the proportion of the total nitrogen pollution discharged into the ocean from agriculture; r sl is the proportion of the total nitrogen non-point source pollution amount caused by crop output; r rain is the proportion of the annual rainfall during the monitoring period in the study area.

3. The calculation method for quantifying the spatial input of total nitrogen non-point source pollution from agricultural planting as described in claim 2, characterized in that, The potential value Q of total nitrogen non-point source pollution in agricultural planting entering the sea * is where 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 non-point source pollution transport capacity index of the j-th agricultural planting unit; s is the area of each agricultural planting unit.

4. The calculation method for quantifying the spatial input of total nitrogen non-point source pollution from agricultural planting into the sea as described in claim 3, characterized in that, The total nitrogen non-point source pollution transfer coefficient T for agricultural planting * is T * = ηT; where η is the correction coefficient for the total nitrogen non-point source pollution input into the sea for agricultural planting, that is T is the transfer capacity index of total nitrogen non-point source pollution for agricultural planting.

5. The calculation method for quantifying the spatial pollution of total nitrogen in agricultural planting sources flowing into the sea as described in claim 1, characterized in that, The total nitrogen non-point source pollution input amount in the agricultural planting unit at the spatial scale is the total nitrogen non-point source pollution input amount considering the agricultural planting unit, that is, the total nitrogen non-point source pollution input amount q of the j-th agricultural planting unit j is where E j is the total nitrogen pollution output coefficient of the j-th agricultural planting unit; is the total nitrogen non-point source pollution transfer coefficient of the j-th agricultural planting unit; s is the area of each agricultural planting unit.

6. The calculation method for quantifying the spatial input of total nitrogen non-point source pollution in agricultural planting as described in claim 1, wherein, Calculating the minimum cumulative resistance value by using the minimum cumulative resistance model of non-point source pollutant migration, and calculating the transfer capacity index of total nitrogen non-point source pollution in agricultural planting according to the obtained minimum cumulative resistance value; The minimum cumulative resistance model of non-point source pollutant migration is at least related to the influencing factors of non-point source pollution diffusion and migration.

7. A calculation system for quantifying the spatial input of total nitrogen non-point source pollution from agricultural planting into the sea, characterized in that, Including: An obtaining module configured to obtain the total nitrogen pollution output coefficient of each agricultural planting unit; A first calculation module configured to calculate the transfer capacity index of total nitrogen non-point source pollution in agricultural planting based on the minimum cumulative resistance model of non-point source pollutant migration; A second calculation module configured to calculate the actual sea-entry value of total nitrogen non-point source pollution in agricultural planting according to the monitoring data at the estuary, and obtaining the correction coefficient of the sea-entry amount of total nitrogen non-point source pollution in agricultural planting by combining the potential sea-entry value of total nitrogen non-point source pollution in agricultural planting units calculated from the total nitrogen non-point source pollution output coefficient and transfer capacity index of agricultural planting units; obtaining the transfer coefficient of total nitrogen non-point source pollution in agricultural planting according to the obtained correction coefficient of the sea-entry amount of total nitrogen non-point source pollution in agricultural planting and the obtained transfer capacity index of total nitrogen non-point source pollution in agricultural planting; A spatial quantification module configured to calculate the sea-entry amount of total nitrogen non-point source pollution of agricultural planting units at the spatial scale according to the obtained transfer coefficient of total nitrogen non-point source pollution in agricultural planting and the total nitrogen pollution output coefficient of each agricultural planting unit, and completing the spatial quantification calculation of the sea-entry of total nitrogen non-point source pollution in agricultural planting.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by a processor, it implements the steps of the calculation method for spatial quantification of the sea-entry of total nitrogen non-point source pollution in agricultural planting as described in 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, When the processor executes the program, it implements the steps of the calculation method for spatial quantification of the sea-entry of total nitrogen non-point source pollution in agricultural planting as described in 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 calculation method for spatial quantification of the sea-entry of total nitrogen non-point source pollution in agricultural planting as described in any one of claims 1-6.

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