Pollutant flux calculation system and method based on in-situ monitoring of the drawdown zone

Abstract

In the pollutant flux calculation system and method based on in-situ monitoring of the drawdown zone, the flux calculation system includes a three-dimensional modeling unit, a sampling point recommendation unit, a sampling unit, a sampling data uploading unit and a flux calculation unit. The three-dimensional modeling unit constructs a reservoir basin including the drawdown zone and scenes within the distance threshold on both sides of the drawdown zone; the sampling point recommendation unit recommends sampling points for soil sampling in the drawdown zone area selected in real time on the three-dimensional modeling unit to obtain a recommended sampling area; the sampling unit performs sampling according to the recommended sampling area given by the sampling point recommendation unit to obtain sampling data; the sampling data uploading unit uploads the sampling data to the pollutant flux calculation system; the flux calculation unit performs pollutant flux calculation on the target drawdown zone according to the sampling data and the flux calculation formula and displays it on the display unit. The present invention ensures the averageness of the sampling data of the sampling points and the accuracy of the pollutant flux calculation results.

Description

Technical Field

[0001] The present invention relates to the field of calculation of pollutant flux in a drawdown zone, and more specifically, to a system and method for calculating pollutant flux based on in-situ monitoring of a drawdown zone. Background Art

[0002] As a correction zone between aquatic and terrestrial ecosystems, the drawdown zone is an active zone for the transfer and transformation of matter and energy in the ecosystem. During the periodic impoundment of the reservoir, the organic matter (SOM), nitrogen and phosphorus in the soil of the submerged area can undergo physical, chemical and biological exchanges with the overlying water through the gaps, affecting the water quality of the overlying water. Studying the distribution of soil organic matter, nitrogen and phosphorus content in the drawdown zone and their impact on the water environment is of great significance for clarifying the biogeochemical cycle of soil organic matter, nitrogen and phosphorus in the drawdown zone, as well as the reconstruction of wetland plant communities and the impact on the water landscape of aquaculture areas.

[0003] However, the calculation of pollutant flux in the drawdown zone under existing technologies is only in the stage of scattered laboratory simulation and research, and there is no applicable platform for the calculation of pollutant flux in the drawdown zone of reservoirs.

[0004] Therefore, the problems existing in the prior art need to be further improved and developed. Summary of the invention

[0005] (I) Purpose of the invention: In order to solve the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a pollutant flux calculation system and method based on in-situ monitoring of the drawdown zone.

[0006] (II) Technical solution: In order to solve the above technical problems, this technical solution provides a pollutant flux calculation system based on in-situ monitoring of the drawdown zone, including a three-dimensional modeling unit, a sampling point recommendation unit, a sampling unit, a sampling data uploading unit, a flux calculation unit and a display unit.

[0007] The three-dimensional modeling unit is used to construct the reservoir basin including the drawdown zone and the scenes within the distance threshold on both sides of the drawdown zone;

[0008] The sampling point recommendation unit is used to recommend sampling points for soil sampling in the water-fluctuation zone area selected in real time on the three-dimensional modeling unit to obtain a recommended sampling area;

[0009] The sampling unit performs sampling according to the recommended sampling area given by the sampling point recommendation unit, and analyzes the sampled soil to obtain sampling data;

[0010] The sampling data uploading unit uploads the sampling data to the pollutant flux calculation system;

[0011] The flux calculation unit calculates the pollutant flux of the target drawdown zone according to the sampling data and the flux calculation formula and displays it on the display unit.

[0012] The pollutant flux calculation system based on in-situ monitoring of the drawdown zone, wherein the three-dimensional modeling unit includes a modeling terminal and a control center, the control center allocates modeling permissions to different accounts of the modeling terminal, and the modeling terminals are respectively set up in different municipal administrative regions. The control center includes different modeling accounts, and each municipal administrative region corresponds to a modeling account. By logging into the modeling account corresponding to the municipal administrative region on the modeling terminal, three-dimensional modeling of different areas of the drawdown zone of the reservoir area can be performed.

[0013] The pollutant flux calculation system based on in-situ monitoring of the drawdown zone, wherein the modeling terminal includes a regional disassembly icon, a drawdown zone determination icon, an environmental impact icon and a scene association icon, the regional disassembly icon starts the control center to disassemble the reservoir drawdown zone map, and the control center disassembles the reservoir drawdown zone map according to the municipal administrative area map to obtain a reservoir drawdown zone regional map; the drawdown zone determination icon is used to modify the area of ​​the drawdown zone in the reservoir drawdown zone regional map; the environmental impact icon is used to create a reservoir drawdown zone regional map or an impact model that affects the pollutant flux in the drawdown zone in the reservoir drawdown zone map; the scene association icon associates the impact model that will affect the pollutant flux in the adjacent drawdown zone at the junction of different reservoir drawdown zone regional maps.

[0014] The pollutant flux calculation system based on in-situ monitoring of the drawdown zone, wherein the control center of the three-dimensional modeling unit is preset with a city-level administrative area map and a reservoir drawdown area map, and the reservoir drawdown area map is a high-modulus three-dimensional map; the city-level administrative area map and the reservoir drawdown area map are respectively set with corresponding position coordinates;

[0015] The control center of the three-dimensional modeling unit is also preset with an impact model that affects the pollutant flux in the drawdown zone, and each impact model corresponds to associated data of different pollutants: the pollutant growth amount corresponding to different distance ranges.

[0016] The pollutant flux calculation system based on in-situ monitoring of the drawdown zone, wherein the regional disassembly icon starts the control center to disassemble the reservoir drawdown zone map, specifically including:

[0017] The regional disassembly icon sends a map disassembly command to the control center, and the control center matches the city-level administrative area map and the reservoir drawdown area map according to the longitude and latitude coordinates;

[0018] The control center divides the reservoir drawdown area map into a plurality of reservoir drawdown area maps according to the municipal administrative districts, and stores them in the storage area of ​​the control center;

[0019] In the divided multiple reservoir drawdown area maps, each reservoir drawdown area map corresponds to the municipal administrative district to which it belongs, and the modeling accounts of different municipal administrative districts correspond to the reservoir drawdown area maps of the municipal administrative districts;

[0020] The reservoir drawdown zone map includes a high-poly part of a non-drawdown change zone and a low-poly part of a drawdown change zone. When the area decomposition icon divides the reservoir drawdown zone map into multiple reservoir drawdown zone regional maps, each reservoir drawdown zone regional map obtained is also composed of a high-poly part of a non-drawdown change zone and a low-poly part of a drawdown change zone corresponding to the municipal administrative area.

[0021] The pollutant flux calculation system based on in-situ monitoring of the drawdown zone, wherein, after the modeling terminal logs in to the modeling account of the corresponding municipal administrative district, the drawdown area model of the municipal administrative district is constructed:

[0022] The control center of the three-dimensional modeling unit updates the reservoir drawdown area map of the corresponding municipal administrative district after determining the drawdown area based on the low-poly part of the drawdown change area in the reservoir drawdown area map according to the drawdown zone determination icon selected in the corresponding modeling account logged in by the modeling terminal, and obtains the first drawdown area model of the corresponding municipal administrative district;

[0023] The control center of the three-dimensional modeling unit creates a target impact model at a specified position in the first drawdown area model according to the selection of the environmental impact icon in the corresponding modeling account logged in by the modeling terminal, thereby obtaining a second drawdown area model;

[0024] The control center of the three-dimensional modeling unit selects the influencing model in the adjacent second drawdown area model of the current municipal administrative district according to the selection of the scene association icon in the corresponding modeling account logged in by the modeling terminal, and adds the influencing model that affects the pollutant flux in the drawdown area of ​​the second drawdown area model of the current municipal administrative district to the second drawdown area model of the current municipal administrative district according to the latitude and longitude coordinates to obtain the drawdown area model.

[0025] The pollutant flux calculation system based on in-situ monitoring of the drawdown zone, wherein the control center of the three-dimensional modeling unit updates the regional map of the reservoir drawdown zone, and the specific process is as follows: the control center retrieves the regional map of the reservoir drawdown zone corresponding to the municipal administrative district of the modeling account logged in by the modeling terminal; the drawdown zone determination icon of the modeling terminal selects the area of ​​the drawdown zone in the regional map of the reservoir drawdown zone corresponding to the municipal administrative district to obtain the drawdown zone area; the control center reshapes and updates the low-poly part of the drawdown change zone of the regional map of the reservoir drawdown zone according to the current drawdown zone area, and the part that is not in the drawdown zone area is supplemented with the low-poly part of the drawdown change zone of the regional map of the reservoir drawdown zone, which is not in the drawdown zone area, to obtain the first drawdown zone model of the corresponding municipal administrative district;

[0026] The control center of the three-dimensional modeling unit selects the influencing model in the adjacent second damping area model of the current municipal administrative district. The specific process is as follows: read the influencing model in the adjacent second damping area model of the current municipal administrative district; select the influencing model in the adjacent second damping area model that affects the pollutant flux of the current municipal administrative district according to the scale of the model and the shortest distance between the influencing model in the adjacent second damping area model of the current municipal administrative district and the second damping area model corresponding to the current municipal administrative district.

[0027] The pollutant flux calculation system based on in-situ monitoring of the drawdown zone, wherein the sampling point recommendation unit recommends sampling points according to sampling requirements, specifically, may be:

[0028] The sampling point recommendation unit retrieves the fluctuation area model corresponding to the current sampling target range, the impact model in the fluctuation area model, and the impact model of the associated adjacent municipal administrative area according to the sampling target range of the sampling requirement; the sampling point recommendation unit screens the impact range in which the pollutant flux in the impact model is greater than zero and the impact model of the area that overlaps with the current sampling requirement to obtain the target impact model; the sampling point recommendation unit selects the recommended sampling area according to the relative position of the target impact model.

[0029] The pollutant flux calculation system based on in-situ monitoring of the drawdown zone, wherein the sampling point recommendation unit selects the recommended sampling area according to the relative position of the target impact model, specifically,

[0030] The sampling point recommendation unit marks the position within the sampling target range when the pollutant flux corresponding to each target impact model is equal to zero, and obtains the marking line corresponding to each target impact model; the part of the sampling target range between the marking line corresponding to each target impact model and the current target impact model is the part where the current target impact model affects the sampling target range, and vice versa, it is the part where the current target impact model does not affect the sampling target range;

[0031] The area composed of the marking lines corresponding to each target impact model and the sampling target range far away from the target impact model is the non-polluted sampling area; when the area composed of the marking lines corresponding to each target impact model is the area covered by each target impact model, there is no non-polluted sampling area in the sampling target range, and this area is a multi-polluted area.

[0032] The pollutant flux calculation method based on in-situ monitoring of the drawdown zone is applied to the flux calculation system, and specifically includes the following steps:

[0033] Step 1: The three-dimensional modeling unit constructs the reservoir basin including the drawdown zone and the scenes within the distance threshold on both sides of the drawdown zone;

[0034] Step 2: The sampling point recommendation unit recommends sampling points for soil sampling in the water-fluctuation zone area selected in real time on the three-dimensional modeling unit to obtain a recommended sampling area;

[0035] Step 3, the sampling unit performs sampling according to the recommended sampling area given by the sampling point recommendation unit, and analyzes the sampled soil to obtain sampling data;

[0036] Step 4: The sampling data uploading unit uploads the sampling data to the pollutant flux calculation system;

[0037] Step 5: The flux calculation unit calculates the pollutant flux of the target drawdown zone according to the sampling data and the flux calculation formula and displays it on the display unit.

[0038] (III) Beneficial effects: The present invention provides a pollutant flux calculation system and method based on in-situ monitoring of the drawdown zone. The drawdown zone of the reservoir is three-dimensionally modeled with the cooperation of the municipal administrative region to which the drawdown zone belongs, and an influence model is added to the three-dimensional modeling of the drawdown zone of the reservoir. Therefore, when recommending sampling points, the averageness of the sampling data of the sampling points is guaranteed, thereby ensuring the accuracy of the pollutant flux calculation results. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of a pollutant flux calculation system based on in-situ monitoring of a drawdown zone according to the present invention;

[0040] Figure 2 It is a schematic diagram of the steps of the pollutant flux calculation method based on in-situ monitoring of the drawdown zone of the present invention. DETAILED DESCRIPTION

[0041] The present invention is further described in detail below in conjunction with preferred embodiments. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0042] The drawdown zone is a water level fluctuation zone. Frequent flooding and exposure of water to this area will lead to more complex biochemical processes in this area. The present invention mainly focuses on the calculation of the flux of the adsorption and release process of pollutants in sediments under water level fluctuations, and then obtains the annual amount.

[0043] The pollutant flux calculation system based on in-situ monitoring of the drawdown zone provided by the present invention is used for calculating the pollutant flux in the drawdown zone of a reservoir, and can be used for calculating the pollutant flux in the drawdown zone of reservoirs such as the Three Gorges Reservoir, Longtan Reservoir, and Longyangxia Reservoir, without limiting the specific reservoir used, such as Figure 1 As shown, it specifically includes a three-dimensional modeling unit, a sampling point recommendation unit, a sampling data uploading unit, a flux calculation unit and a display unit. The three-dimensional modeling unit is used to construct a reservoir basin including a drawdown zone and scenes within a distance threshold on both sides of the drawdown zone. The sampling point recommendation unit is used to recommend sampling points for soil sampling in the drawdown zone area selected in real time on the three-dimensional modeling unit, and upload the sampled soil to the pollutant flux calculation system through the sampling data uploading unit after analysis. The flux calculation unit calculates the pollutant flux for the target drawdown zone, i.e., the selected reservoir drawdown zone, based on the sampling data and the flux calculation formula, and displays it on the display unit.

[0044] Here we take the drawdown zone of the Three Gorges Reservoir as an example to illustrate.

[0045] The three-dimensional modeling unit described in the present invention includes a large scene area and a long coastline, which requires the collaborative work of multiple working groups to complete. First, the municipal area map including the Yangtze River and the reservoir area drawdown zone map corresponding to the reservoir area map are obtained, and the city-level administrative district disassembly icon, drawdown zone determination icon, environmental impact icon, and scene association icon are used to collaboratively construct the three-dimensional modeling unit, thereby constructing a complete reservoir drawdown zone model.

[0046] Specifically, the three-dimensional modeling unit includes a modeling terminal and a control center, and the control center allocates modeling permissions to different accounts of the modeling terminal. The modeling terminals are respectively set up in different municipal administrative districts, and the control center includes different modeling accounts, each municipal administrative district corresponds to a modeling account. By logging in to the modeling account corresponding to the municipal administrative district on the modeling terminal, three-dimensional modeling of different areas of the drawdown zone of the reservoir area can be achieved.

[0047] The modeling terminal includes a regional disassembly icon, a drawdown zone determination icon, an environmental impact icon and a scene association icon. The regional disassembly icon starts the control center to disassemble the reservoir drawdown zone map. The control center disassembles the reservoir drawdown zone map according to the municipal administrative area map to obtain a reservoir drawdown zone regional map. The drawdown zone determination icon is used to modify the area of ​​the drawdown zone in the reservoir drawdown zone regional map. The environmental impact icon is used to create a reservoir drawdown zone regional map or an impact model that affects the pollutant flux in the drawdown zone in the reservoir drawdown zone map. The scene association icon associates the impact models that will affect the pollutant flux in the adjacent drawdown zone at the junction of different reservoir drawdown zone regional maps.

[0048] The control center of the three-dimensional modeling unit is preset with a city-level administrative area map and a reservoir drawdown area map, and the city-level administrative area map and the reservoir drawdown area map are respectively set with corresponding position coordinates, and the position coordinates are preferably longitude and latitude coordinates. The reservoir drawdown area map is a three-dimensional map, preferably a high-modulus three-dimensional map.

[0049] The control center of the three-dimensional modeling unit is also preset with impact models that affect the pollutant flux in the drawdown zone, including living area models, farmland models, breeding models, etc. Each impact model corresponds to the associated data of different pollutants: the growth of pollutants corresponding to different distance ranges. For example, the living area model corresponds to the growth of organic matter, nitrogen, and phosphorus fluxes in different distance ranges; the farmland model corresponds to the growth of organic matter, nitrogen, and phosphorus fluxes in different distance ranges; the breeding model corresponds to the growth of organic matter, nitrogen, and phosphorus fluxes in different distance ranges. In the calculation of pollutant flux in the drawdown zone, it usually refers to the calculation of organic matter, nitrogen, and phosphorus fluxes.

[0050] The regional disassembly icon starts the control center to disassemble the reservoir drawdown area map, which specifically includes: the regional disassembly icon sends a map disassembly command to the control center, and the control center matches the municipal administrative area map and the reservoir drawdown area map according to the longitude and latitude coordinates. Then, the control center divides the reservoir drawdown area map into multiple reservoir drawdown area regional maps according to the municipal administrative districts, and stores them in the storage area of ​​the control center. Among the multiple divided reservoir drawdown area regional maps, each reservoir drawdown area regional map corresponds to the municipal administrative district to which it belongs, and the control center of the three-dimensional modeling unit associates each reservoir drawdown area regional map with the modeling account corresponding to the corresponding municipal administrative district, or the control center associates the reservoir drawdown area regional map corresponding to the current modeling account. Thereby, the modeling accounts of different municipal administrative districts correspond to the reservoir drawdown area regional maps of the municipal administrative districts.

[0051] After the modeling terminal logs in to the modeling account of the corresponding municipal administrative district, the fluctuation area model of the municipal administrative district is constructed.

[0052] The reservoir drawdown area map includes a high-poly part of a non-drawdown change area and a low-poly part of a drawdown change area. When the area decomposition icon divides the reservoir drawdown area map into a plurality of reservoir drawdown area regional maps, each reservoir drawdown area regional map obtained is also composed of a high-poly part of a non-drawdown change area and a low-poly part of a drawdown change area corresponding to the municipal administrative area. The high-poly part of the non-drawdown change area is the area in the reservoir drawdown area map that is not covered by the water body and has not been separated from the water body, and the low-poly part of the drawdown change area is the area in the reservoir drawdown area map where the water level line may appear.

[0053] The control center of the three-dimensional modeling unit determines the low-poly part of the drawdown change zone in the reservoir drawdown zone map according to the selection of the drawdown zone determination icon in the corresponding modeling account logged in by the modeling terminal. After determining the drawdown zone area, the reservoir drawdown zone map of the corresponding municipal administrative district is updated to obtain the first drawdown area model of the corresponding municipal administrative district.

[0054] The specific process is as follows:

[0055] The control center retrieves a regional map of the reservoir drawdown area corresponding to the municipal administrative district of the modeling account logged into the modeling terminal.

[0056] The drawdown zone determination icon of the modeling terminal is used to select the drawdown zone area in the reservoir drawdown zone area map corresponding to the municipal administrative district to obtain the drawdown zone area.

[0057] The control center reshapes and updates the low-poly part of the drawdown change zone of the reservoir drawdown area map and the part that is not in the drawdown zone area according to the current drawdown zone area, and supplements the low-poly part of the drawdown change zone of the reservoir drawdown area map and the part that is not in the drawdown zone area to obtain the first drawdown area model of the corresponding municipal administrative area.

[0058] The low-poly part of the drawdown change zone of the reservoir drawdown area map that is not in the drawdown zone area is supplemented. Specifically, the supplement can be extended around the current area.

[0059] The control center of the three-dimensional modeling unit creates a target impact model at a specified position in the first drawdown area model according to the selection of the environmental impact icon in the corresponding modeling account logged in by the modeling terminal, and obtains a second drawdown area model.

[0060] The target impact model refers to the specific living area model, farmland model or breeding model selected in the impact model.

[0061] Create a target impact model at a specified location in the first drawdown area model. Specifically, the living area model, farmland model or breeding model in the impact model can be copied through the environmental impact icon and pasted to the specified location.

[0062] The control center of the three-dimensional modeling unit selects the influencing model in the second drawdown area model adjacent to the current municipal administrative district according to the selection of the scene association icon in the corresponding modeling account logged in by the modeling terminal, and associates the influencing model of the second drawdown area model of the current municipal administrative district that has the influence of the drawdown area pollutant flux to obtain the drawdown area model.

[0063] The control center of the three-dimensional modeling unit selects the influencing model in the adjacent second drawdown area model of the current municipal administrative district, which may be:

[0064] Read the impact model in the second drawdown area model adjacent to the current municipal administrative district;

[0065] According to the scale of the model and the shortest distance between the impact model in the adjacent second decline area model of the current municipal administrative district and the second decline area model corresponding to the current municipal administrative district, the impact model in the adjacent second decline area model that affects the pollutant flux of the current municipal administrative district is selected.

[0066] If the shortest distance between the impact model in the adjacent second fluctuation area model of the current municipal administrative district and the second fluctuation area model corresponding to the current municipal administrative district is less than or equal to the first distance, then the current impact model is the impact model in the adjacent second fluctuation area model that affects the pollutant flux of the current municipal administrative district. If the shortest distance between the impact model in the adjacent second fluctuation area model of the current municipal administrative district and the second fluctuation area model corresponding to the current municipal administrative district is greater than the first distance, then the current impact model is the impact model in the adjacent second fluctuation area model that does not affect the pollutant flux of the current municipal administrative district. Among them, the first distance is a preset value, which is less than or equal to the maximum value of the distance range when the organic matter, nitrogen, and phosphorus fluxes corresponding to the impact model are greater than zero.

[0067] The influencing model of the second fluctuation area model of the current municipal administrative district that has the influence of the fluctuation area pollutant flux will be associated with the second fluctuation area model of the current municipal administrative district, that is, the influencing model of the second fluctuation area model of the current municipal administrative district that has the influence of the fluctuation area pollutant flux will be added to the second fluctuation area model of the current municipal administrative district according to the longitude and latitude coordinates to obtain the fluctuation area model corresponding to the current municipal administrative district.

[0068] In the process of modeling the 3D modeling unit, a modeling strategy combining high-poly and low-poly models is adopted, which greatly reduces the amount of data during modeling, improves the modeling speed, and reduces the requirements for system hardware.

[0069] The pollutant flux calculation system based on in-situ monitoring of the drawdown zone also includes an input unit, and the sampling requirement can be determined according to the selected reservoir drawdown zone, or can be input through the input unit of the pollutant flux calculation system based on in-situ monitoring of the drawdown zone. The sampling requirement at least includes a sampling target range and a sampling purpose.

[0070] The sampling point recommendation unit recommends sampling points according to sampling requirements. The sampling target range can be a reservoir drawdown zone area within a certain city-level administrative area, or a designated area of ​​a reservoir drawdown zone area within a certain city-level administrative area. It should be noted that the sampling target range is a regional range, not a designated sampling point.

[0071] The sampling point recommendation unit recommends sampling points according to the sampling target range, specifically, it can be:

[0072] The sampling point recommendation unit retrieves the fluctuation area model corresponding to the current sampling target range, the impact model in the fluctuation area model, and the impact model of the associated adjacent city-level administrative district according to the sampling target range;

[0073] The sampling point recommendation unit screens the impact model of the impact range of organic matter, nitrogen and phosphorus fluxes greater than zero in the impact model and the impact model of the overlapped area required for current sampling to obtain the target impact model;

[0074] The sampling point recommendation unit selects a recommended sampling area according to the relative position of the target impact model.

[0075] The recommended sampling area can be a specific location or a location area. When the sampling area is a specific location, the specific location is the recommended sampling point. When the sampling area is a location area, the recommended sampling point is any location within the recommended sampling area.

[0076] The sampling point recommendation unit selects a recommended sampling area according to the relative position of the target impact model. Specifically, the sampling point recommendation unit marks the position within the sampling target range when the organic matter, nitrogen, and phosphorus fluxes corresponding to each target impact model are equal to zero, and obtains the marked line corresponding to each target impact model. The portion of the sampling target range between the marked line corresponding to each target impact model and the current target impact model is the portion where the current target impact model has an impact on the sampling target range, and vice versa. The area composed of the marked line corresponding to each target impact model and the sampling target range away from the target impact model is a non-polluted sampling area. When the area composed of the marked lines corresponding to each target impact model is an area covered by each target impact model, there is no non-polluted sampling area in the sampling target range. At this time, the area is a multi-polluted area.

[0077] The sampling point recommendation unit selects the corresponding recommended sampling area in the above area according to the sampling purpose in the sampling requirement. For example, when the sampling purpose is to calculate the impact of a certain target impact model on the sampling target range, the sampling point recommendation unit selects the part of the sampling target range between the marked line corresponding to the target impact model and the current target impact model as the recommended sampling area; when the sampling purpose is to exclude the pollutant flux impact of the target impact model on the sampling target range, the sampling point recommendation unit selects the non-polluted sampling area as the recommended sampling area.

[0078] The pollutant flux calculation system based on in-situ monitoring of the drawdown zone also includes a sampling unit, which performs sampling according to the recommended sampling area given by the sampling point recommendation unit, and analyzes the sampled soil to obtain sampling data.

[0079] The sampling data uploading unit uploads the sampling data obtained by the sampling unit to the pollutant flux calculation system based on in-situ monitoring of the drawdown zone.

[0080] The flux calculation unit calculates the pollutant flux for the selected reservoir drawdown zone according to the sampling data and the flux calculation formula.

[0081] When the flux calculation unit performs pollutant flux calculation on the selected reservoir drawdown zone according to the sampling data and the flux calculation formula, the sampling requirement is determined according to the selected reservoir drawdown zone.

[0082] The flux calculation process is as follows:

[0083] The fluxes of soil pollutants such as organic matter, nitrogen and phosphorus in the drawdown zone during the dry-down period were calculated, and the fluxes of soil organic matter, nitrogen and phosphorus in the drawdown zone during the dry-down period were obtained respectively;

[0084] The fluxes of soil pollutants such as organic matter, nitrogen and phosphorus in the drawdown zone during the flooding period were calculated, and the fluxes of soil organic matter, nitrogen and phosphorus in the drawdown zone during the flooding period were obtained respectively;

[0085] The fluxes of soil pollutants such as organic matter, nitrogen and phosphorus in the drawdown zone during one drawdown cycle were calculated, and the fluxes of soil organic matter, nitrogen and phosphorus in the drawdown zone during one drawdown cycle were obtained respectively.

[0086] The calculation process of the flux of soil pollutants such as organic matter, nitrogen and phosphorus in the drawdown zone during the dry-down period includes the calculation of soil organic matter flux in the drawdown zone during the dry-down period, the calculation of soil nitrogen flux in the drawdown zone during the dry-down period, and the calculation of soil phosphorus flux in the drawdown zone during the dry-down period.

[0087] The calculation process of soil organic matter flux in the drawdown zone during the dry-down period includes:

[0088] The expression of soil organic matter input in the drawdown zone during the dry-down period is:

[0089] ORM 输入 =ORM rb +ORM prs +ORM mb +ORM sr ;

[0090] ORM 输入 is the organic matter input into the drawdown zone per unit time, ORM rb Organic matter, ORM, is the input of above-ground plant and animal residues. prs Organic matter input from dead plant roots, ORM mb Organic matter metabolized by animals and microorganisms, ORM sr Organic matter input by surface runoff.

[0091] ORM rb =prb*ORM pb *rte / rte fa

[0092] ORM prs =pprs*ORM rsu *ros / ros fa

[0093] ORM mb =amio ra *ORM ioom

[0094] ORM sr = Amount of rainfall and surface runoff

[0095] Prb is the proportion of aboveground animal and plant residues, ORM pb It is the organic matter in the dead plant bodies above the ground, rte / rte fa is the factor of the relationship between the organic matter circulation ratio and air temperature (its value is between 0 and 1) and the mean value of the factor. pprs is the proportion of root residues after death, ORM rsu It is the organic matter in the dead plant bodies in the underground part of the root system, ros / ros fa is the factor of the relationship between organic matter circulation ratio and sudden temperature (its value is between 0 and 1) and the mean value of the factor. ra ORM is the ratio of organic matter ingested by animals and microorganisms that is not absorbed and transformed. ioom Organic matter ingested by animal microorganisms.

[0096] Because the output of organic matter in the soil of the drawdown zone during the dry period is mainly organic matter converted into CO2 and CH4, or organic matter lost under anaerobic conditions,

[0097] ORM 输出 =ORMCOH +ORM deni

[0098] ORM 输出 ORM is the organic matter output from the soil in the fluctuation zone per unit time. COH Organic matter converted into CO2 and CH4, ORM deni It is the organic matter lost under anaerobic environment.

[0099] Using the principle of balance of payments, according to the expressions of input and output of soil organic matter in the drawdown zone per unit time during the dry-down period, the expression of organic matter flux is obtained:

[0100] F ORM落干 =(ORM 输入 -ORM 输出 )*Δt*A=(ORM rb +ORM prs +ORM mb +ORM sr -ORM COH -ORM deni )*Δt*A;

[0101] F ORM落干 is the soil organic matter flux in the drawdown zone during the dry-down period, Δt is the time difference between the end time and the initial time, and A is the soil area in the drawdown zone.

[0102] The calculation process of soil nitrogen flux in the drawdown zone during the dry season includes:

[0103] The expression of soil nitrogen input in the drawdown zone during the dry season is:

[0104] NIT 输入 =NIT rb +NIT prs +NIT mb +NIT sr ;

[0105] NIT 输入 NIT is the nitrogen input into the soil of the fluctuating zone per unit time. rb Nitrogen input from above-ground plant and animal residues, NIT prs Nitrogen input to dead plant roots, NIT mb Nitrogen metabolized by animals and microorganisms, NIT sr Nitrogen input as surface runoff.

[0106] NIT rb =ORM rb / ORMN s

[0107] NIT prs =ORMprs / ORMN r

[0108] NIT mb =ORM mb / ORMN m

[0109] NIT sr = Amount of rainfall and surface runoff

[0110] ORMN s ORMN is the ratio of organic matter to nitrogen in aboveground plant and animal residues. r ORMN is the ratio of organic matter to nitrogen in the roots of dead plants. m It is the ratio of organic matter to nitrogen in animal and microbial metabolites.

[0111] Because the output of nitrogen in the drawdown zone during the dry season mainly includes fixed or mineralized ammonium nitrogen, nitrogen lost by ammonia volatilization, nitrogen taken up by plant and animal microorganisms, and nitrogen lost under anaerobic conditions,

[0112] NIT 输出 =NIT COH +NIT amv +NIT ing +NIT deni

[0113] NIT 输出 NIT is the nitrogen output from the soil in the drawdown zone per unit time. COH For fixed or mineralized ammonium nitrogen, NIT amv Nitrogen lost due to ammonia volatilization, NIT ing Nitrogen absorbed by plant and animal microorganisms and converted into animal and plant microbial life forms, including nitrate nitrogen and ammonia nitrogen. deni Nitrogen lost under anaerobic conditions.

[0114] Using the principle of balance of payments, according to the expressions of input and output of soil nitrogen in the ebb-dry zone per unit time during the ebb-dry period, the expression of soil nitrogen flux in the ebb-dry zone is obtained.

[0115] F NIT落干 =(NIT 输入 -NIT 输出 )*Δt*A=(NIT rb +NIT prs +NIT mb +NIT sr -NIT COH -NIT amv -NIT ing -NIT deni )*Δt*A;

[0116] F NIT落干 It is the soil nitrogen flux in the drawdown zone during the dry season.

[0117] The calculation process of soil phosphorus flux in the drawdown zone during the dry-down period includes:

[0118] The expression of soil phosphorus input in the drawdown zone during the dry season is:

[0119] PHO 输入 =PHO rb +PHO prs +PHO mb +PHO sr ;

[0120] PHO 输入 is the phosphorus input into the soil of the drawdown zone per unit time, PHO rb Phosphorus input from above-ground plant and animal residues, PHO prs Phosphorus input to dead plant roots, PHO mb Phosphorus metabolized by animals and microorganisms, PHO sr Phosphorus input as surface runoff.

[0121] PHO rb =ORM rb / ORMP s

[0122] PHO prs =ORM prs / ORMP r

[0123] When PHO hm -ORM hm / ORMP hmo >0, PHO mb =PHO hm -ORM hm / ORMP hmo ;

[0124] When PHO hm -ORM hm / ORMP hmo When ≤0, PHO mb =0;

[0125] PHO sr = Amount of rainfall and surface runoff

[0126] ORMP s ORMP is the ratio of organic matter to phosphorus in aboveground plant and animal residues. r PHO is the ratio of organic matter to phosphorus in the roots of dead plants. hm is the phosphorus content in animal microorganisms, ORMhm is the content of organic matter in animal microorganisms, ORMP hmo The optimal ratio of phosphorus and organic matter in animals or microorganisms.

[0127] Because the output of phosphorus in the drawdown zone during the dry season mainly includes solidified or mineralized phosphorus, that is, phosphorus taken up by animals, plants and microorganisms,

[0128] PHO 输出 =PHO sm +PHO ing

[0129] PHO 输出 is the phosphorus output in the drawdown zone per unit time, PHO sm For immobilized or mineralized phosphorus, PHO ing Phosphorus is taken up by plants and animals and converted into the life forms of plants and animals and microorganisms.

[0130] Using the principle of budget balance, according to the expressions of input and output of soil phosphorus in the drawdown zone per unit time during the drawdown period, the expression of soil phosphorus flux in the drawdown zone during the drawdown period was obtained.

[0131] F PHO落干 =(PHO 输入 -PHO 输出 )*Δt*A=(PHO rb +PHO prs +PHO mb +PHO sr -PHO sm -PHO ing )*Δt*A

[0132] F PHO落干 It is the soil phosphorus flux in the drawdown zone during the dry season.

[0133] The calculation process of the flux of soil pollutants such as organic matter, nitrogen and phosphorus in the drawdown zone during the flooding period includes the calculation of soil organic matter flux in the drawdown zone during the flooding period, the calculation of soil nitrogen flux in the drawdown zone during the flooding period, and the calculation of soil phosphorus flux in the drawdown zone during the flooding period.

[0134] The calculation process of soil organic matter flux in the drawdown zone during the flooding period includes:

[0135] The expression of soil organic matter input in the drawdown zone during the flooding period is:

[0136] ORM′ 输入 =ORM′ rb +ORM′ mb +ORM′ se +ORM′ ad ;

[0137] ORM′输入 is the organic matter input into the fluctuation zone per unit time, ORM′ rb ORM′ refers to the organic matter input by the decay and decomposition of plants, animals and microorganisms in the soil of the fluctuating zone. mb Organic matter metabolized by animals and microorganisms, ORM' se ORM′ is the organic matter that settles, such as algae, plankton, and suspended matter. ad It is the organic matter adsorbed by the soil in the drawdown zone.

[0138] Because the output of organic matter in the soil of the drawdown zone during the flooding period is similar to that during the drying period, it is mainly organic matter converted into CO2 and CH4, or organic matter lost in anaerobic conditions and organic matter released by the soil of the drawdown zone during the flooding period.

[0139] ORM′ 输出 =ORM′ COH +ORM′ deni +ORM′ rel

[0140] ORM′ 输出 is the organic matter output from the soil in the fluctuation zone per unit time, ORM′ COH Organic matter converted into CO2 and CH4, ORM′ deni ORM′ is the organic matter lost under anaerobic conditions. rel It is the organic matter released from the soil in the drawdown zone.

[0141] Using the principle of balance of payments, according to the expressions of input and output of soil organic matter in the drawdown zone per unit time during the flooding period, the expression of soil organic matter flux in the drawdown zone during the flooding period is obtained.

[0142] F ORM水淹 =(ORM′ 输入 -ORM′ 输出 )*Δt*A=(ORM′ rb +ORM′ mb +ORM′ se +ORM′ ad -ORM′ C0H -ORM′ deni -ORM′ rel )*Δt*A

[0143] F ORM水淹 It is the soil organic matter flux in the drawdown zone during the flooding period.

[0144] The calculation process of soil nitrogen flux in the drawdown zone during the flooding period includes:

[0145] The expression of soil nitrogen input in the drawdown zone during the flooding period is:

[0146] NIT′输入 =NIT′ rot +NIT′ mb +NIT′ se +NIT′ ad ;

[0147] NIT′ 输入 is the nitrogen input to the soil in the water-fluctuation zone per unit time, NIT′ mb Nitrogen metabolized by animals and microorganisms, NIT′ se Nitrogen settled by algae, plankton, suspended matter, etc., NIT′ ad It is the nitrogen adsorbed by the soil in the drawdown zone.

[0148] Because the output of nitrogen in the drawdown zone during the flooding period mainly includes solidified or mineralized ammonium nitrogen, nitrogen ingested by animals, plants and microorganisms in the drawdown zone soil and converted into their life forms, nitrogen lost in anaerobic conditions and nitrogen released by the drawdown zone soil,

[0149] NIT′ 输出 =NIT′ COH +NIT′ ing +NIT′ deni +NIT′ rel

[0150] NIT′ 输出 NIT′ is the nitrogen output from the soil in the fluctuation zone per unit time. COH For fixed or mineralized ammonium nitrogen, NIT' ing Nitrogen absorbed by plant and animal microorganisms and converted into nitrogen for plant and animal microbial life, NIT' deni NIT′ is the nitrogen lost under anaerobic conditions. rel Nitrogen released from soil in the drawdown zone.

[0151] Using the principle of balance of payments, according to the expressions of input and output of soil nitrogen in the drawdown zone per unit time during the flooding period, the expression of soil nitrogen flux in the drawdown zone is obtained.

[0152] F′ NIT水淹 =(NIT′ 输入 -NIT′ 输出 )*Δt*A=(NIT′ rot +NIT′ mb +NIT′ se +NIT′ ad -NIT′ COH -NIT′ ing -NIT′ deni -NIT′ rel )*Δt*A

[0153] F′ NIT水淹It is the soil nitrogen flux in the drawdown zone during the flooding period.

[0154] The calculation process of soil phosphorus flux in the drawdown zone during the flooding period includes:

[0155] The expression of soil phosphorus input in the drawdown zone during the flooding period is:

[0156] PH0′ 输入 =PH0′ rb +PHO′ mb +PHO′ se +PHO′ ad ;

[0157] PHO′ 输入 is the phosphorus input into the drawdown zone per unit time, PHO′ rb Phosphorus input from the decay and decomposition of plants, animals and microorganisms in the soil of the drawdown zone, PHO′ mb Phosphorus metabolized by animals and microorganisms, PHO′ se Phosphorus settled by algae, plankton, suspended matter, etc., PHO′ ad Phosphorus adsorbed by soil in the drawdown zone.

[0158] Because the output of phosphorus in the drawdown zone during the flooding period mainly includes solidified or mineralized phosphorus, phosphorus ingested and converted into its life form by animals, plants and microorganisms in the drawdown zone soil, and phosphorus released by the drawdown zone soil,

[0159] PHO′ 输出 =PH0′ COH +PHO′ ing +PHO′ rel

[0160] PHO′ 输出 is the phosphorus output from the soil in the drawdown zone per unit time, PHO′ COH For immobilized or mineralized phosphorus, PHO′ ing Phosphorus, PHO′, is taken up by plants and animals and converted into the life form of plants and animals rel Phosphorus released from the soil in the drawdown zone.

[0161] Using the principle of balance of payments, according to the expressions of input and output of soil phosphorus in the drawdown zone per unit time during the flooding period, the expression of soil phosphorus flux in the drawdown zone during the flooding period is obtained.

[0162] F′ PH0水淹 =(PHO′ 输入 -PHO′ 输出 )*Δt*A=(PHO′ rb +PHO′ mb +PHO′ se +PHO′ ad -PHO′cOH -PHO′ ing -PHO′ rel )*Δt*A

[0163] F′ PHO水淹 It is the soil phosphorus flux in the drawdown zone during the flooding period.

[0164] The process of calculating the flux of soil pollutants such as organic matter, nitrogen and phosphorus in the drawdown zone during a drawdown cycle includes the calculation of the flux of soil organic matter, nitrogen and phosphorus in the drawdown zone during the dry period, the calculation of the flux of soil organic matter, nitrogen and phosphorus in the drawdown zone during the flooded period, and the calculation of the flux of soil organic matter, nitrogen and phosphorus in the drawdown zone during the drawdown cycle.

[0165] The flux calculation of soil organic matter, nitrogen and phosphorus in the drawdown zone during the dry season includes:

[0166] According to multiple sets of sampling data, the above calculation expression of the drying period is simplified based on the material balance theory to obtain the following expression:

[0167]

[0168] F 落干期 is the soil organic matter, nitrogen and phosphorus flux in the drawdown zone during the reservoir dry period, λ is the content of organic matter, nitrogen and phosphorus per unit area in the drawdown zone, A i is the soil area of ​​the drawdown zone, b is the initial stage of the drawdown zone, e is the final stage of the drawdown zone, and n is the number of sampling points used for calculation. When the calculation result is positive, the content of soil organic matter, nitrogen and phosphorus in the drawdown zone during the drawdown period decreases, otherwise it increases.

[0169] The calculation formula for the content of organic matter, nitrogen and phosphorus per unit area in the soil of the water-fluctuation zone is:

[0170] λ=mρh×10 -3

[0171] ρ is the soil bulk density in the water-fluctuation zone, m is the content of organic matter, nitrogen and phosphorus in the soil in the water-fluctuation zone, and h is the soil depth in the water-fluctuation zone. ρ is the preset value, which can be ρ = 1.40 g / cm 3 The soil depth is the depth of the surface soil at the time of sampling.

[0172] The soil area of ​​the drawdown zone used in the calculation can be divided by watershed, and the drawdown zone area of ​​each watershed is pre-stored in the flux calculation system. The exchange flux of soil organic matter, nitrogen and phosphorus content in the drawdown zone of the basin during the dry period is obtained by multiplying the area of ​​each watershed with the change in organic matter, nitrogen and phosphorus content per unit area of ​​the soil at the sampling point of the basin before and after the dry period. Then, the exchange flux of each watershed is added to obtain the exchange flux of soil organic matter, nitrogen and phosphorus in the drawdown zone of the reservoir during the dry period.

[0173] The flux calculation of soil organic matter, nitrogen and phosphorus in the drawdown zone during the flooding period includes:

[0174] According to multiple sets of sampling data, the above calculation expression of flooding period is simplified based on material balance theory to obtain the following expression:

[0175]

[0176] F 水淹期 It is the flux of soil organic matter, nitrogen and phosphorus in the drawdown zone of the reservoir during the flooding period. When the calculated result is positive, the content of soil organic matter, nitrogen and phosphorus in the drawdown zone during the flooding period decreases, otherwise it increases.

[0177] The calculation results of the content of organic matter, nitrogen and phosphorus per unit area in the drawdown zone during the flooding period are used to calculate the flux of soil organic matter, nitrogen and phosphorus in the drawdown zone during the flooding period according to the above expressions. The soil area of ​​the drawdown zone used for calculation can be divided by watershed. The exchange flux of soil organic matter, nitrogen and phosphorus in the drawdown zone during the flooding period can be obtained by multiplying the area of ​​each watershed with the change of soil organic matter, nitrogen and phosphorus content before and after the flooding period at the sampling point of the watershed. Then, the exchange flux of each watershed can be added to obtain the exchange flux of soil organic matter, nitrogen and phosphorus in the drawdown zone during the flooding period of the reservoir.

[0178] The flux of soil organic matter, nitrogen and phosphorus in the fluctuation zone of the fluctuation cycle is calculated as follows:

[0179] The fluxes of soil organic matter, nitrogen and phosphorus in the drawdown zone can be obtained by summing the fluxes during the dry period and the flooded period.

[0180] The pollutant flux calculation method based on in-situ monitoring of the drawdown zone is applied to the above-mentioned pollutant flux calculation system based on in-situ monitoring of the drawdown zone, such as Figure 2 As shown, the specific steps include the following:

[0181] Step 1: The three-dimensional modeling unit constructs the reservoir basin including the drawdown zone and the scenes within the distance threshold on both sides of the drawdown zone;

[0182] Step 2: The sampling point recommendation unit recommends sampling points for soil sampling in the water-fluctuation zone area selected in real time on the three-dimensional modeling unit to obtain a recommended sampling area;

[0183] Step 3, the sampling unit performs sampling according to the recommended sampling area given by the sampling point recommendation unit, and analyzes the sampled soil to obtain sampling data;

[0184] Step 4: The sampling data uploading unit uploads the sampling data to the pollutant flux calculation system;

[0185] Step 5: The flux calculation unit calculates the pollutant flux of the target drawdown zone according to the sampling data and the flux calculation formula and displays it on the display unit.

[0186] The present invention designs a new pollutant flux calculation system and method based on in-situ monitoring of the drawdown zone. The three-dimensional modeling of the reservoir drawdown zone is carried out through the cooperation of the municipal administrative district to which the reservoir drawdown zone belongs, thereby ensuring the accuracy of the modeling results. The three-dimensional modeling of the reservoir drawdown zone is added with an influence model, which not only fully considers the influencing factors of the pollution flux of the reservoir drawdown zone, but also can recommend sampling points according to actual conditions, thereby ensuring the averageness of the sampling data of the sampling points and the accuracy of the pollutant flux calculation results in the pollutant flux calculation.

[0187] The above content is an explanation of the preferred embodiments of the present invention, which can help those skilled in the art to more fully understand the technical solution of the present invention. However, these embodiments are merely illustrative, and it cannot be determined that the specific implementation methods of the present invention are limited to the description of these embodiments. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions and transformations can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. A pollutant flux calculation system based on in-situ monitoring of the drawdown zone, characterized in that: It includes 3D modeling unit, sampling point recommendation unit, sampling unit, sampling data uploading unit, flux calculation unit and display unit. The three-dimensional modeling unit is used to construct the reservoir basin including the drawdown zone and the scenes within the distance threshold on both sides of the drawdown zone; The sampling point recommendation unit is used to recommend sampling points for soil sampling in the water-fluctuation zone area selected in real time on the three-dimensional modeling unit to obtain a recommended sampling area; The sampling unit performs sampling according to the recommended sampling area given by the sampling point recommendation unit, and analyzes the sampled soil to obtain sampling data; The sampling data uploading unit uploads the sampling data to the pollutant flux calculation system; The flux calculation unit calculates the pollutant flux of the target drawdown zone according to the sampling data and the flux calculation formula and displays it on the display unit; The three-dimensional modeling unit includes a modeling terminal and a control center. The control center allocates modeling permissions to different accounts of the modeling terminal. The modeling terminals are respectively set in different municipal administrative districts. The control center includes different modeling accounts. Each municipal administrative district corresponds to a modeling account. By logging into the modeling account corresponding to the municipal administrative district on the modeling terminal, three-dimensional modeling is performed on different areas of the drawdown zone of the reservoir area. The modeling terminal includes a regional disassembly icon, a drawdown zone determination icon, an environmental impact icon and a scene association icon. The regional disassembly icon starts the control center to disassemble the reservoir drawdown zone map. The control center disassembles the reservoir drawdown zone map according to the municipal administrative area map to obtain a reservoir drawdown zone regional map; the drawdown zone determination icon is used to modify the area of ​​the drawdown zone in the reservoir drawdown zone regional map; the environmental impact icon is used to create a reservoir drawdown zone regional map or an impact model that affects the pollutant flux in the drawdown zone in the reservoir drawdown zone map; the scene association icon associates the impact model that will affect the pollutant flux in the adjacent drawdown zone at the junction of different reservoir drawdown zone regional maps.

2. The pollutant flux calculation system based on in-situ monitoring of the drawdown zone according to claim 1 is characterized in that: The control center of the three-dimensional modeling unit is preset with a city-level administrative area map and a reservoir drawdown area map, wherein the reservoir drawdown area map is a high-poly three-dimensional map; the city-level administrative area map and the reservoir drawdown area map are respectively set with corresponding position coordinates; The control center of the three-dimensional modeling unit is also preset with an impact model that affects the pollutant flux in the drawdown zone, and each impact model corresponds to associated data of different pollutants: the pollutant growth amount corresponding to different distance ranges.

3. The pollutant flux calculation system based on in-situ monitoring of the drawdown zone according to claim 2 is characterized in that: The regional disassembly icon starts the control center to disassemble the reservoir drawdown area map, including: The regional disassembly icon sends a map disassembly command to the control center, and the control center matches the city-level administrative area map and the reservoir drawdown area map according to the longitude and latitude coordinates; The control center divides the reservoir drawdown area map into a plurality of reservoir drawdown area maps according to the municipal administrative districts, and stores them in the storage area of ​​the control center; In the divided multiple reservoir drawdown area maps, each reservoir drawdown area map corresponds to the municipal administrative district to which it belongs, and the modeling accounts of different municipal administrative districts correspond to the reservoir drawdown area maps of the municipal administrative districts; The reservoir drawdown zone map includes a high-poly part of a non-drawdown change zone and a low-poly part of a drawdown change zone. When the area decomposition icon divides the reservoir drawdown zone map into multiple reservoir drawdown zone regional maps, each reservoir drawdown zone regional map obtained is also composed of a high-poly part of a non-drawdown change zone and a low-poly part of a drawdown change zone corresponding to the municipal administrative area.

4. The pollutant flux calculation system based on in-situ monitoring of the drawdown zone according to claim 3 is characterized in that: After the modeling terminal logs in to the modeling account of the corresponding city-level administrative district, the fluctuation area model of the city-level administrative district is constructed: The control center of the three-dimensional modeling unit updates the reservoir drawdown area map of the corresponding municipal administrative district after determining the drawdown area based on the low-poly part of the drawdown change area in the reservoir drawdown area map according to the drawdown zone determination icon selected in the corresponding modeling account logged in by the modeling terminal, and obtains the first drawdown area model of the corresponding municipal administrative district; The control center of the three-dimensional modeling unit creates a target impact model at a specified position in the first drawdown area model according to the selection of the environmental impact icon in the corresponding modeling account logged in by the modeling terminal, thereby obtaining a second drawdown area model; The control center of the three-dimensional modeling unit selects the influencing model in the adjacent second drawdown area model of the current municipal administrative district according to the selection of the scene association icon in the corresponding modeling account logged in by the modeling terminal, and adds the influencing model that affects the pollutant flux in the drawdown area of ​​the second drawdown area model of the current municipal administrative district to the second drawdown area model of the current municipal administrative district according to the latitude and longitude coordinates to obtain the drawdown area model.

5. The pollutant flux calculation system based on in-situ monitoring of the drawdown zone according to claim 4 is characterized in that: The control center of the three-dimensional modeling unit updates the regional map of the reservoir drawdown zone. The specific process is as follows: the control center retrieves the regional map of the reservoir drawdown zone corresponding to the municipal administrative district of the modeling account logged in by the modeling terminal; the drawdown zone determination icon of the modeling terminal selects the area of ​​the drawdown zone in the regional map of the reservoir drawdown zone corresponding to the municipal administrative district to obtain the drawdown zone area; the control center reshapes and updates the low-poly part of the drawdown change zone of the regional map of the reservoir drawdown zone according to the current drawdown zone area, and the part that is not in the drawdown zone area is supplemented with the low-poly part of the drawdown change zone of the regional map of the reservoir drawdown zone, and the part that is not in the drawdown zone area is obtained to obtain the first drawdown zone model of the corresponding municipal administrative district; The control center of the three-dimensional modeling unit selects the influencing model in the adjacent second damping area model of the current municipal administrative district. The specific process is as follows: read the influencing model in the adjacent second damping area model of the current municipal administrative district; select the influencing model in the adjacent second damping area model that affects the pollutant flux of the current municipal administrative district according to the scale of the model and the shortest distance between the influencing model in the adjacent second damping area model of the current municipal administrative district and the second damping area model corresponding to the current municipal administrative district.

6. The pollutant flux calculation system based on in-situ monitoring of the drawdown zone according to claim 1 is characterized in that: The sampling point recommendation unit recommends sampling points according to sampling requirements, specifically, The sampling point recommendation unit retrieves the fluctuation area model corresponding to the current sampling target range, the impact model in the fluctuation area model, and the impact model of the associated adjacent municipal administrative area according to the sampling target range of the sampling requirement; the sampling point recommendation unit screens the impact range in which the pollutant flux in the impact model is greater than zero and the impact model of the area that overlaps with the current sampling requirement to obtain the target impact model; the sampling point recommendation unit selects the recommended sampling area according to the relative position of the target impact model.

7. The pollutant flux calculation system based on in-situ monitoring of the drawdown zone according to claim 6 is characterized in that: The sampling point recommendation unit selects a recommended sampling area according to the relative position of the target impact model, specifically, The sampling point recommendation unit marks the position within the sampling target range when the pollutant flux corresponding to each target impact model is equal to zero, and obtains the marking line corresponding to each target impact model; The part of the sampling target range between the marked line corresponding to each target impact model and the current target impact model is the part where the current target impact model affects the sampling target range, and vice versa, it is the part where the current target impact model does not affect the sampling target range; The area composed of the marking lines corresponding to each target impact model and the sampling target range far away from the target impact model is the non-polluted sampling area; when the area composed of the marking lines corresponding to each target impact model is the area covered by each target impact model, there is no non-polluted sampling area in the sampling target range, and this area is a multi-polluted area.

8. A pollutant flux calculation method based on in-situ monitoring of the drawdown zone, applied to the flux calculation system according to any one of claims 1 to 7, characterized in that: The specific steps include: Step 1: The three-dimensional modeling unit constructs the reservoir basin including the drawdown zone and the scenes within the distance threshold on both sides of the drawdown zone; Step 2: The sampling point recommendation unit recommends sampling points for soil sampling in the water-fluctuation zone area selected in real time on the three-dimensional modeling unit to obtain a recommended sampling area; Step 3, the sampling unit performs sampling according to the recommended sampling area given by the sampling point recommendation unit, and analyzes the sampled soil to obtain sampling data; Step 4: The sampling data uploading unit uploads the sampling data to the pollutant flux calculation system; Step 5: The flux calculation unit calculates the pollutant flux of the target drawdown zone according to the sampling data and the flux calculation formula and displays it on the display unit.

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