Rainy day overflow pollution analysis and calculation method for flood drainage pump station

Abstract

The invention discloses a rainy day overflow pollution analysis and calculation method for a flood drainage pump station, and relates to the field of environmental science. According to the scheme, the method comprises the steps that the target pump station under each pump station type in multiple pump station types is determined based on the incidence relation between the forebay water quality of at least one target pump station and different rainfall types in the historical time period; on the basis of underlying surface interpretation of a catchment area of the target pump station under each pump station type in the different rainfall types, the pollution load of rainfall runoff of the target pump station under each pump station type in the different rainfall types is determined; based on the rainfall runoff pollution load of the target pump station under each pump station type in different rainfall types, the living source pollution load of the target pump station under each pump station type in different rainfall types, and the total pollution load of the target pump station under each pump station type in different rainfall types, the pollution load of the target pump station under each pump station type in different rainfall types is calculated; and determining the proportion of various overflow pollution sources of the target pump station under each pump station type in different rainfall types.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of environmental science, and particularly relates to a rain overflow pollution analysis and calculation method for a drainage pump station. BACKGROUND

[0002] In the process of river pollution control, post-rain overflow is one of the important reasons for river pollution. Therefore, how to accurately analyze the main source of rain overflow pollution of the discharge outlet of the drainage pump station, and then control the river pollution through the situation, becomes a technical problem to be solved. SUMMARY

[0003] The present application provides a rain overflow pollution analysis and calculation method for a drainage pump station, comprising: determining at least one target pump station in the plurality of pump stations based on the relative positions of the target section in the target river and the plurality of pump stations in the target river; determining the target pump station under each pump station type in the plurality of pump station types based on the correlation between the front pool water quality of the at least one target pump station and different rainfall types in the historical period; determining the pollution load of the rainfall runoff of the target pump station under each pump station type in the different rainfall types based on the underlying surface interpretation of the catchment area of the target pump station under each pump station type in the different rainfall types, and calculating the life source pollution load of the target pump station under each pump station type in the different rainfall types; determining the proportion of a plurality of overflow pollution sources of the target pump station under each pump station type in the different rainfall types based on the pollution load of the rainfall runoff of the target pump station under each pump station type in the different rainfall types, the life source pollution load of the target pump station under each pump station type in the different rainfall types, and the total pollution load of the target pump station under each pump station type in the different rainfall types, wherein the plurality of overflow pollution sources include at least one of the following: rainfall runoff pollution, life source pollution, and pipeline deposition pollution.

[0004] By adopting the method provided in the embodiment, the target pump station under each pump station type in multiple pump station types is determined based on the correlation between the front pool water quality of at least one target pump station and different rainfall types in a historical period; then the pollution load of rainfall runoff of the target pump station under each pump station type in the different rainfall types is determined based on the underlying surface interpretation of the catchment area of the target pump station under each pump station type in the different rainfall types, and the domestic source pollution load of the target pump station under each pump station type in the different rainfall types is calculated; and then the proportion of multiple overflow pollution sources of the target pump station under each pump station type in the different rainfall types is determined based on the pollution load of rainfall runoff of the target pump station under each pump station type in the different rainfall types, the domestic source pollution load of the target pump station under each pump station type in the different rainfall types, and the total pollution load of the target pump station under each pump station type in the different rainfall types. In this way, the target pump station can be divided into multiple types according to the correlation between the front pool water quality of the target pump station and different rainfall types in a historical period, and then by analyzing the pollution sources of the target pump stations of multiple types, the proportion of overflow pollution sources of different types of target pump stations in different rainfall types can be accurately analyzed, that is, the main source of rain day overflow pollution of different types of drainage pump stations can be accurately analyzed, and then the proportion can provide effective guidance for river management.

[0005] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0006] The accompanying drawings are used to better understand the present application and do not limit the present application. Among them: Figure 1 is a flowchart of a rain day overflow pollution analysis and calculation method for drainage pump stations according to an embodiment of the present application. DETAILED DESCRIPTION

[0007] The exemplary embodiments of the present application are described below in conjunction with the accompanying drawings, which include various details of the embodiments of the present application to help understanding. They should be considered only as exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope of the present application. Similarly, in order to be clear and concise, the description below omits the description of well-known functions and structures.

[0008] Figure 1 is a schematic flowchart of a rain day overflow pollution analysis and calculation method for drainage pump stations according to an embodiment provided by the present application.

[0009] S110, determining at least one target pump station in the plurality of pump stations based on a target section in the target river channel and relative positions of the plurality of pump stations in the target river channel.

[0010] S120, determining target pump stations in each pump station type in the plurality of pump station types based on a correlation between a front pool water quality of the at least one target pump station and different rainfall types in a historical period.

[0011] S130, determining pollution loads of rainfall runoff of the target pump stations in each pump station type in the different rainfall types based on surface interpretation of catchment areas of the target pump stations in each pump station type in the different rainfall types, and calculating life source pollution loads of the target pump stations in each pump station type in the different rainfall types.

[0012] S140, determining proportions of a plurality of overflow pollution sources of the target pump stations in each pump station type in the different rainfall types based on the pollution loads of rainfall runoff of the target pump stations in each pump station type in the different rainfall types, the life source pollution loads of the target pump stations in each pump station type in the different rainfall types, and total pollution loads of the target pump stations in each pump station type in the different rainfall types, wherein the plurality of overflow pollution sources include at least one of rainfall runoff pollution, life source pollution, and pipeline deposition pollution.

[0013] The rain day overflow pollution analysis and calculation method for drainage pump stations provided in the embodiments of the present application can be executed by an electronic device. The electronic device can be a terminal, a server, or other electronic devices with computing capability. It should be understood that the above is only an exemplary description of the electronic device, and in actual processing, the electronic device can not be limited to the devices mentioned in the above examples, as long as the electronic device can execute the rain day overflow pollution analysis and calculation method for drainage pump stations provided in the embodiments of the present application, it is within the protection scope of the embodiments of the present application.

[0014] By adopting the method provided in the embodiment, based on the correlation between the front pool water quality of at least one target pump station and different rainfall types in a historical period, the target pump station in each pump station type of multiple pump station types is determined; then based on the underlying surface interpretation of the catchment area of the target pump station in each pump station type in the different rainfall types, the pollution load of the rainfall runoff of the target pump station in each pump station type in the different rainfall types is determined, and the pollution load of the domestic source of the target pump station in each pump station type in the different rainfall types is calculated; and then based on the pollution load of the rainfall runoff of the target pump station in each pump station type in the different rainfall types, the pollution load of the domestic source of the target pump station in each pump station type in the different rainfall types, and the total pollution load of the target pump station in each pump station type in the different rainfall types, the proportion of multiple overflow pollution sources of the target pump station in each pump station type in the different rainfall types is determined. In this way, the target pump station can be divided into multiple types according to the correlation between the front pool water quality of the target pump station and different rainfall types in a historical period, and then by analyzing the pollution sources of the target pump stations of multiple types, the proportion of the overflow pollution sources of the target pump stations of different types in different rainfall types can be accurately analyzed, that is, the main source of the rain day overflow pollution of the drainage pump stations of different types can be accurately analyzed, and then the proportion can provide effective guidance and suggestions for river management.

[0015] In an embodiment, the determining at least one target pump station from the plurality of pump stations based on the relative position of the target section in the target river and the plurality of pump stations in the target river comprises: determining a plurality of candidate pump stations located upstream of the target section from the plurality of pump stations based on the relative position of the target section in the target river and the plurality of pump stations in the target river; and determining at least one target pump station from the plurality of candidate pump stations based on the catchment area, drainage volume and drainage water quality of the plurality of candidate pump stations.

[0016] The determining a plurality of candidate pump stations located upstream of the target section from the plurality of pump stations based on the relative position of the target section in the target river and the plurality of pump stations in the target river comprises: determining a target area range containing the target section in the target river; determining the plurality of pump stations in the target area range; and taking the pump stations located upstream of the target section from the plurality of pump stations as the plurality of candidate pump stations. The size of the target area range can be set according to actual conditions, which is not limited in the present application. For example, the target area range can be a range of 50 kilometers located upstream of the target section in the target river, which can be larger or smaller, and the specific range can be set according to actual conditions.

[0017] Taking a kth pump station in the plurality of candidate pump stations as an example, the at least one target pump station is determined from the plurality of candidate pump stations based on the catchment range, the drainage volume, and the drainage water quality of the plurality of candidate pump stations, including: in a case where the catchment range of the kth candidate pump station is greater than a catchment range threshold, and / or the drainage volume of the kth candidate pump station is greater than a drainage volume threshold, and / or the drainage water quality of the kth candidate pump station is greater than a water quality threshold, the kth candidate pump station is taken as one of the at least one target pump station. The catchment range threshold, the drainage volume threshold, and the water quality threshold can be set according to actual conditions, and the present application does not limit them.

[0018] By adopting the method provided in the embodiment, the at least one target pump station is determined from the plurality of candidate pump stations based on the catchment range, the drainage volume, and the drainage water quality of the plurality of candidate pump stations upstream of the target section of the target river. In this way, the target pump station that has a greater impact on the target river pollution within a certain range is determined with the target section as an anchor point, and then the overflow pollution analysis on the target pump station can improve the efficiency of the overflow pollution analysis on the target river.

[0019] In an implementation manner, the target pump station under each pump station type in the plurality of pump station types is determined based on the association relationship between the pre-pool water quality of the at least one target pump station and different rainfall types in a historical period, including at least one of the following: in a case where the pre-pool of the kth target pump station has domestic sewage mixed in under different rainfall types and under a non-rainfall type in the historical period, the kth target pump station is taken as a target pump station under a first type in the plurality of pump station types, where k is a positive integer, and the kth target pump station is one of the at least one target pump station; in a case where the pre-pool of the kth target pump station has domestic sewage mixed in under different rainfall types in the historical period, and there is no domestic sewage mixed in under a non-rainfall type in the historical period, the kth target pump station is taken as a target pump station under a second type in the plurality of pump station types; in a case where the pre-pool of the kth target pump station has domestic sewage mixed in only under a target rainfall type in which rainfall is greater than a specified threshold in the different rainfall types in the historical period, and the mixed amount of the domestic sewage is less than or equal to a mixed amount threshold, the kth target pump station is taken as a target pump station under a third type in the plurality of pump station types.

[0020] The determination manner of the different rainfall types in the historical period includes: determining rainfall amounts of a plurality of rainfall events of the target region in the historical period based on meteorological data of the target region range in the historical period; and determining rainfall types of the plurality of rainfall events based on the rainfall amounts of the plurality of rainfall events.

[0021] The meteorological data of the target region range in the historical period is obtained in one of the following ways: based on historical data related to meteorology of the target region range in the historical period; or by monitoring the meteorology of the target region range in the historical period.

[0022] For example, the a-th rainfall event in the plurality of rainfall events, based on the rainfall amount of the plurality of rainfall events, the rainfall type of the plurality of rainfall events is determined, including one of the following: in the case that the rainfall amount of the a-th rainfall event in a unit time is greater than 0 millimeter and less than 10 millimeters, it is determined that the rainfall type of the a-th rainfall event is light rain type; in the case that the rainfall amount of the a-th rainfall event in a unit time is greater than or equal to 10 millimeters and less than 25 millimeters, it is determined that the rainfall type of the a-th rainfall event is moderate rain type; in the case that the rainfall amount of the a-th rainfall event in a unit time is greater than or equal to 25 millimeters and less than 50 millimeters, it is determined that the rainfall type of the a-th rainfall event is heavy rain type; in the case that the rainfall amount of the a-th rainfall event in a unit time is greater than or equal to 50 millimeters, it is determined that the rainfall type of the a-th rainfall event is torrential rain type. Wherein, the a-th rainfall event is one of the plurality of rainfall events, a is a positive integer, the unit time can be 24 hours, or longer or shorter, which is not limited here.

[0023] The determination method of the non-rainfall type in the historical period includes: based on the meteorological data of the target region range in the historical period, determining the non-rainfall sub-period of the target region in the historical period; setting the type of the non-rainfall sub-period of the target region in the historical period as the non-rainfall type. Wherein, the non-rainfall type can also be referred to as sunny day.

[0024] In combination with examples, the reasons for the mixing of domestic sewage in the different rainfall types and the non-rainfall type of the front pool of the k-th target pump station in the historical period are explained: due to the long-term overload operation of the k-th target pump station, the domestic sewage and rainwater pollution combined flow in the catchment area of the k-th target pump station are more likely to overflow to the front pool of the k-th target pump station, therefore, the domestic sewage is mixed in the different rainfall types and the non-rainfall type of the front pool of the k-th target pump station in the historical period.

[0025] In combination with examples, the reasons for the mixing of domestic sewage in the different rainfall types of the front pool of the k-th target pump station in the historical period and the non-existence of the mixing of domestic sewage in the non-rainfall type of the k-th target pump station in the historical period are explained: the k-th target pump station is provided with a plurality of sewage interception pipelines along the river, so that the domestic sewage is mixed in the front pool of the k-th target pump station only during rainfall, and there is no mixing of domestic sewage during non-rainfall.

[0026] With the examples, the reason that the front pool of the kth target pump station has domestic sewage mixed in only in the target rainfall type in which the rainfall amount is greater than the specified threshold value among the different rainfall types in the historical period and the mixed amount of the domestic sewage is less than or equal to the mixed amount threshold value is explained as follows: the front pool of the kth target pump station is connected with a plurality of rainwater outlets in the catchment area, the inflow sewage is intercepted by the interception and storage pool of the front pool of the kth target pump station and then discharged after being treated by the integrated sewage treatment facility next to the front pool, and only when the rainfall is particularly large and the upstream inflow exceeds the interception capacity of the front pool, a small amount of domestic sewage and rainwater will overflow into the front pool of the pump station.

[0027] Through the above implementation, the type of the kth target pump station can be accurately analyzed according to the mixed amount of the domestic sewage in the front pool of the kth target pump station in the different rainfall types and the non-rainfall type in the historical period.

[0028] In an implementation, further comprising: determining a water quality category of the kth target pump station in the different rainfall types in the historical period based on the front pool water quality of the kth target pump station in the different rainfall types in the historical period; and determining an overflow pollution risk of the kth target pump station in the different rainfall types in the historical period based on the water quality category of the kth target pump station in the different rainfall types in the historical period. The front pool water quality includes at least one of the following: ammonia nitrogen (NH3-N), permanganate index (CODMn), and the like.

[0029] The determination of the water quality category of the kth target pump station in the different rainfall types in the historical period based on the front pool water quality of the kth target pump station in the different rainfall types in the historical period includes: determining the water quality category of the kth target pump station in the different rainfall types in the historical period based on the average value of the front pool water quality parameters of the kth target pump station in the different rainfall types in the historical period. The determination of the water quality category can be determined according to GB 3838-2002 “Surface Water Environmental Quality Standard”, and the specific determination method is not limited in the application.

[0030] Taking the moderate rainfall type in the different rainfall types as an example, for example, the determined water quality category of the kth target pump station in the moderate rainfall type in the historical period includes one of the following: Class III to Class IV, Class IV to Class V, and inferior Class V, and the like.

[0031] Still taking the moderate rain type in different rainfall types as an example, the determination of the overflow pollution risk of the kth target pump station in the moderate rain type based on the water quality class of the kth target pump station in different rainfall types in the historical period can be: determining the overflow pollution risk of the kth target pump station in the moderate rain type based on the water quality class of the kth target pump station in the moderate rain type in the historical period. For example, in the case where the water quality class of the kth target pump station in the moderate rain type in the historical period is in the range of Class III to Class IV, it is determined that the overflow pollution risk of the kth target pump station in the moderate rain type is low risk; in the case where the water quality class of the kth target pump station in the moderate rain type in the historical period is in the range of Class IV to Class V, it is determined that the overflow pollution risk of the kth target pump station in the moderate rain type is medium risk; in the case where the water quality class of the kth target pump station in the moderate rain type in the historical period is Class V, it is determined that the overflow pollution risk of the kth target pump station in the moderate rain type is high risk.

[0032] Still taking the moderate rain type in different rainfall types as an example, the overflow pollution risk of the kth target pump station is explained in combination with Table 1: in the case where the average value of the ammonia nitrogen concentration in the front pool water quality parameter of the kth target pump station in the moderate rain type is greater than 1.0 mg / L and less than or equal to 1.5 mg / L, and / or the average value of the permanganate index concentration in the front pool water quality parameter is greater than 6 mg / L and less than or equal to 10 mg / L, it is determined that the water quality class of the kth target pump station in the moderate rain type is Class III to Class IV, and the overflow pollution risk of the kth target pump station in the moderate rain type is low risk; in the case where the average value of the ammonia nitrogen concentration in the front pool water quality parameter of the kth target pump station in the moderate rain type is greater than 1.5 mg / L and less than or equal to 2.0 mg / L, and / or the average value of the permanganate index concentration in the front pool water quality parameter is greater than 10 mg / L and less than or equal to 15 mg / L, it is determined that the water quality class of the kth target pump station in the moderate rain type is Class IV to Class V, and the overflow pollution risk of the kth target pump station in the moderate rain type is medium risk; in the case where the average value of the ammonia nitrogen concentration in the front pool water quality parameter of the kth target pump station in the moderate rain type is greater than 2.0 mg / L, and / or the average value of the permanganate index concentration in the front pool water quality parameter is greater than 15 mg / L, it is determined that the water quality class of the kth target pump station in the moderate rain type is Class V, and the overflow pollution risk of the kth target pump station in the moderate rain type is high risk.

[0033] Table 1 In addition, the method can further comprise: determining a water quality class of the kth target pumping station in the non-rainfall type in the historical period based on the water quality of the front pool of the kth target pumping station in the non-rainfall type in the historical period; and determining the risk of overflow pollution of the kth target pumping station in the non-rainfall type based on the water quality class of the kth target pumping station in the non-rainfall type in the historical period. The specific manner is the same as that of determining the water quality class of the kth target pumping station in the different rainfall type in the historical period and determining the risk of overflow pollution of the kth target pumping station in the different rainfall type, which will not be described herein.

[0034] Through the above embodiments, the water quality parameters of the pumping stations in the non-rainfall type (i.e., sunny day) and the different rainfall types can be analyzed, the water quality classes corresponding to the pumping stations in the non-rainfall type and the different rainfall types are determined, and then the risks of overflow pollution of the pumping stations in the non-rainfall type and the different rainfall types are determined according to the water quality classes. In this way, the risks of overflow pollution of the pumping stations in the non-rainfall type and the different rainfall types can provide effective guidance for river management.

[0035] In an embodiment, the determining of the pollution load of the rainfall runoff of the target pumping station of each pumping station type in the different rainfall types based on the interpretation of the underlying surface of the catchment area of the target pumping station of each pumping station type in the different rainfall types comprises: determining the rainfall runoff of each underlying surface based on the interpretation of each underlying surface of the catchment area of the target pumping station of each pumping station type in the different rainfall types; and determining the pollution load of the rainfall runoff of the target pumping station of each pumping station type in the different rainfall types based on the rainfall runoff of each underlying surface and the pollutant concentration of each underlying surface.

[0036] Taking a kth target pumping station of a first type in a target pumping station of each pumping station type in a moderate rainfall type in the different rainfall types as an example, the determining of the rainfall runoff of each underlying surface based on the interpretation of each underlying surface of the catchment area of the target pumping station of each pumping station type in the different rainfall types comprises: determining the rainfall runoff of each underlying surface of the catchment area of the kth target pumping station based on the interpretation of each underlying surface of the catchment area of the kth target pumping station of the first type in the moderate rainfall type.

[0037] The determination of the rainfall runoff of each type of underlying surface of the catchment area of the kth target pump station based on the interpretation of each type of underlying surface of the catchment area of the kth target pump station under the first type of the moderate rain type comprises: obtaining the area of the ith type of underlying surface and the total underlying surface area of the catchment area of the kth target pump station based on the interpretation of each type of underlying surface of the catchment area of the kth target pump station under the first type of the moderate rain type; and determining the rainfall runoff of the ith type of underlying surface based on the area of the ith type of underlying surface, the total underlying surface area of the catchment area of the kth target pump station, the runoff coefficient of the ith type of underlying surface, the comprehensive runoff coefficient of the target area, the daily sewage flow of the pre-pool of the kth target pump station in the moderate rain type, and the field rainfall runoff flow of the outlet cross-section of the kth target pump station in the moderate rain type. The total underlying surface area of the catchment area of the kth target pump station is the sum of the areas of each type of underlying surface of the catchment area of the kth target pump station.

[0038] The runoff coefficient of the ith type of underlying surface can be set according to the type of the ith type of underlying surface, and the specific setting method is not limited in the present application. For example, the runoff coefficient of the ith type of underlying surface can be determined according to the values specified in GB50014-2021 “Outdoor Drainage Design Standard” and the distribution of the ith type of underlying surface. The type of the ith type of underlying surface includes one of the following: road, roof, green land, etc.

[0039] The field rainfall runoff flow of the outlet cross-section of the kth target pump station in the moderate rain type can be obtained from historical hydrological data or measured, and the present application is not limited.

[0040] The daily sewage flow of the pre-pool of the kth target pump station in the moderate rain type can be obtained from historical hydrological data, and in the present application, the daily sewage flow of the pre-pool of the kth target pump station in the moderate rain type can be set to 0.

[0041] In combination with the formula, the determination of the rainfall runoff of the ith type of underlying surface based on the area of the ith type of underlying surface, the total underlying surface area of the catchment area of the kth target pump station, the runoff coefficient of the ith type of underlying surface, the comprehensive runoff coefficient of the target area, the daily sewage flow of the pre-pool of the kth target pump station in the moderate rain type, and the field rainfall runoff flow of the outlet cross-section of the kth target pump station in the moderate rain type is described as follows: wherein, is the rainfall runoff of the ith type of underlying surface, is the field rainfall runoff flow of the outlet cross-section of the kth target pump station in the moderate rain type, the daily sewage flow of the kth target pump station in the moderate rain type; is the area of the ith underlying surface; is the total underlying surface area of the catchment area of the kth target pump station; is the runoff coefficient of the ith underlying surface; is the comprehensive runoff coefficient of the target area.

[0042] The comprehensive runoff coefficient of the target area can be determined based on the sum of the product of the area of each underlying surface of the catchment area of the kth target pump station in the first type in the moderate rain type and the runoff coefficient of the underlying surface corresponding to the area, and the total underlying surface area of the catchment area of the kth target pump station in the first type in the moderate rain type. The specific calculation formula is: wherein, represents the comprehensive runoff coefficient of the target area, represents the sum of the product of the area of each underlying surface of the catchment area of the kth target pump station in the first type in the moderate rain type and the runoff coefficient of the underlying surface corresponding to the area, is the total underlying surface area of the catchment area of the kth target pump station.

[0043] It can be understood that the determination of the rainfall runoff of each underlying surface of the catchment area of each target pump station in each pump station type in the different rainfall types is the same as the determination of the rainfall runoff of the ith underlying surface of the catchment area of the kth target pump station in the first type in the moderate rain type, which will not be described here.

[0044] Still taking the kth target pump station in the first type in the target pump station in each pump station type in the moderate rain type in the different rainfall types as an example, the determination of the pollution load of the rainfall runoff of the target pump station in each pump station type in the different rainfall types based on the rainfall runoff of each underlying surface and the pollutant concentration of each underlying surface includes: obtaining the pollution load of each underlying surface based on the rainfall runoff of each underlying surface, the pollutant concentration of each underlying surface, and the conversion unit; and obtaining the pollution load of the rainfall runoff of the kth target pump station in the first type in the moderate rain type based on the sum of the pollution load of the rainfall runoff of each underlying surface. The unit of the rainfall runoff is cubic meters (m 3 ), the unit of the pollutant concentration is milligrams per liter (mg / L), and the pollutant concentration of each underlying surface can be obtained from historical hydrological data or measured. The application is not limited. Specifically, the calculation formula is: wherein, represents the pollution load of the rainfall runoff of the kth target pump station under the first type in the moderate rain type, represents the pollution load of the rainfall runoff of the ith underlying surface in each underlying surface; represents a conversion unit; represents the pollutant concentration of the ith underlying surface in each underlying surface; represents the rainfall runoff of the ith underlying surface in each underlying surface.

[0045] It can be understood that the determination manner of the pollution load of the rainfall runoff of the target pump station under each pump station type in the different rainfall types is the same as the determination manner of the pollution load of the rainfall runoff of the kth target pump station under the first type in the moderate rain type, which will not be described herein again.

[0046] By adopting the method provided in the embodiment, the rainfall runoff of each underlying surface is determined based on the interpretation of each underlying surface of the catchment area of the target pump station under each pump station type in the different rainfall types; and the pollution load of the rainfall runoff of the target pump station under each pump station type in the different rainfall types is determined based on the rainfall runoff of each underlying surface and the pollutant concentration of each underlying surface. In this way, the pollution load of the rainfall runoff of the target pump station under each pump station type in the different rainfall types can be obtained more accurately.

[0047] In an implementation, the calculation of the domestic pollution load of the target pump station under each pump station type in the different rainfall types comprises: determining the domestic sewage discharge of the target pump station under each pump station type in the different rainfall types based on the total amount of drainage of the target pump station under each pump station type in the different rainfall types and the rainfall runoff of the catchment area of the target pump station under each pump station type in the different rainfall types; and obtaining the domestic pollution load of the target pump station under each pump station type in the different rainfall types based on the domestic sewage discharge of the target pump station under each pump station type in the different rainfall types and the pollutant concentration of the front pool in the non-rainfall type of the target pump station under each pump station type in the historical period.

[0048] Taking the kth target pump station under the first type in the target pump station under each pump station type in the moderate rain type in the different rainfall types as an example, the rainfall runoff of the catchment area of the target pump station under each pump station type in the different rainfall types can be the sum of the rainfall runoff of each underlying surface of the catchment area of the kth target pump station under the first type in the moderate rain type.

[0049] Still taking the medium rain type in the different rain types, the kth target pump station in the first type under each pump station type as an example, the determining the domestic source sewage discharge amount of the target pump station of each pump station type in the different rain types based on the total drainage amount of the target pump station of each pump station type in the different rain types, the rainfall runoff flow of the catchment area of the target pump station of each pump station type in the different rain types comprises: subtracting the rainfall runoff flow of the catchment area of the kth target pump station in the first type under the medium rain type from the total drainage amount of the kth target pump station in the first type under the medium rain type to obtain the domestic source sewage discharge amount of the kth target pump station in the first type under the medium rain type.

[0050] In a possible implementation, in the case that the type of the kth target pump station is the third type, the domestic source sewage discharge amount of the kth target pump station in the different rain types can be set to 0, and the calculation manner of the domestic source sewage discharge amount of each target pump station of the second type in the different rain types is the same as the obtaining manner of the domestic source sewage discharge amount of the kth target pump station of the first type in the different rain types. This is because, since the difference between the target pump station of the second type (i.e., the pump station of the B type) and the target pump station of the first type (i.e., the pump station of the A type) is only that the pump station of the A type has domestic sewage mixed in under different rain types and the non-rain type, while the pump station of the B type has domestic sewage mixed in only after rain (i.e., the different rain type), therefore, the obtaining manner of the domestic sewage mixed amount of the pump station of the B type and the pump station of the A type in the different rain types is the same, and the target pump station of the third type (i.e., the pump station of the C type) has only a small amount of domestic sewage and rainwater flow into the pump station forebay to overflow into the pump station forebay when the upstream inflow exceeds the interception capacity of the forebay when the rainfall is particularly large, and therefore, the pump station of the C type can be regarded as having no domestic sewage mixed in.

[0051] Still taking the medium rain type in the different rain types, the kth target pump station in the first type under each pump station type as an example, the determining the domestic source sewage discharge amount of the target pump station of each pump station type in the different rain types based on the total drainage amount of the target pump station of each pump station type in the different rain types, the rainfall runoff flow of the catchment area of the target pump station of each pump station type in the different rain types comprises: subtracting the rainfall runoff flow of the catchment area of the kth target pump station in the first type under the medium rain type from the total drainage amount of the kth target pump station in the first type under the medium rain type to obtain the domestic source sewage discharge amount of the kth target pump station in the first type under the medium rain type. wherein, is the domestic pollution load of the kth target pump station under the first type in the moderate rain type, is the domestic sewage discharge of the kth target pump station under the first type in the moderate rain type, is the pre-pool pollutant concentration of the kth target pump station under the first type in the historical period in the non-rain type (i.e. sunny day).

[0052] By adopting the method provided in the embodiment, the domestic sewage discharge of the target pump station under each pump station type in the different rain types is determined based on the total drainage of the target pump station under each pump station type in the different rain types and the rainfall runoff flow of the catchment area of the target pump station under each pump station type in the different rain types; and the domestic pollution load of the target pump station under each pump station type in the different rain types is obtained based on the domestic sewage discharge of the target pump station under each pump station type in the different rain types and the pre-pool pollutant concentration of the target pump station under each pump station type in the historical period in the non-rain type. In this way, the total domestic sewage discharge of the target pump station can be accurately calculated through the total drainage of the target pump station and the rainfall runoff flow of the catchment area of the target pump station in the case that the total domestic sewage discharge of the target pump station cannot be directly obtained.

[0053] In an implementation manner, the determining the proportion of the multiple overflow pollution sources of the target pump station under each pump station type in the different rain types based on the pollution load of the rainfall runoff of the target pump station under each pump station type in the different rain types, the domestic pollution load of the target pump station under each pump station type in the different rain types, and the total pollution load of the target pump station under each pump station type in the different rain types comprises: determining the pipe deposition pollution load of the target pump station under each pump station type in the different rain types based on the pollution load of the rainfall runoff of the target pump station under each pump station type in the different rain types, the domestic pollution load of the target pump station under each pump station type in the different rain types, and the total pollution load of the target pump station under each pump station type in the different rain types; and determining the proportion of the multiple overflow pollution sources of the target pump station under each pump station type in the different rain types based on the pollution load of the rainfall runoff of the target pump station under each pump station type in the different rain types, the domestic pollution load of the target pump station under each pump station type in the different rain types, the pipe deposition pollution load of the target pump station under each pump station type in the different rain types, and the total pollution load of the target pump station under each pump station type in the different rain types.

[0054] The determination of the pipe deposition pollution load of the target pump station under each pump station type in the different rainfall types can comprise: subtracting the rainfall runoff pollution load of the kth target pump station under the first type in the moderate rainfall type, the domestic source pollution load of the target pump station under the first type in the moderate rainfall type from the total pollution load of the kth target pump station under the first type in the moderate rainfall type, to obtain the pipe deposition pollution load of the kth target pump station under the first type in the moderate rainfall type.

[0055] The total pollution load of the kth target pump station under the first type in the moderate rainfall type is the total weight of pollutants of the kth target pump station under the first type in the moderate rainfall type. The pollutants include at least one of ammonia nitrogen and permanganate. The total pollution load of the kth target pump station under the first type in the moderate rainfall type can be obtained based on the product of the total amount of drainage of the kth target pump station under the first type in the moderate rainfall type and the pollutant concentration of the pre-pool of the kth target pump station under the first type in the moderate rainfall type. The pollutant concentration of the pre-pool of the kth target pump station under the first type in the moderate rainfall type is obtained according to the historical water quality data of the sub-period corresponding to the moderate rainfall type in the historical period.

[0056] Still taking the moderate rain type in different rainfall types, the kth target pump station under the first type in each pump station type as an example, the proportion of each pollution source of overflow of the target pump station under each pump station type in the different rainfall types is determined based on the pollution load of rainfall runoff of the target pump station under each pump station type in the different rainfall types, the domestic source pollution load of the target pump station under each pump station type in the different rainfall types, the pipeline deposition pollution load of the target pump station under each pump station type in the different rainfall types, and the total pollution load of the target pump station under each pump station type in the different rainfall types, including: dividing the pollution load of rainfall runoff of the kth target pump station under the first type in the moderate rain type by the total pollution load of the kth target pump station under the first type in the historical period to obtain the proportion of rainfall runoff pollution of the kth target pump station under the first type in the moderate rain type; dividing the domestic source pollution load of the kth target pump station under the first type in the moderate rain type by the total pollution load of the kth target pump station under the first type in the moderate rain type to obtain the proportion of domestic source pollution of the kth target pump station under the first type in the moderate rain type; and dividing the pipeline deposition pollution load of the kth target pump station under the first type in the moderate rain type by the total pollution load of the kth target pump station under the first type in the moderate rain type to obtain the proportion of pipeline deposition pollution of the kth target pump station under the first type in the moderate rain type.

[0057] As shown in Table Two, in the case that the kth target pump station is a target pump station under the first type or a target pump station under the second type, the expression of the proportion of rainfall runoff pollution of the kth target pump station under the first type in the different rainfall types, the proportion of domestic source pollution of the kth target pump station under the first type in the different rainfall types, and the proportion of pipeline deposition pollution of the kth target pump station under the first type in the different rainfall types is: Table Two As shown in Table Three, in the case that the kth target pump station is a target pump station under the third type, the proportion only includes: the proportion of rainfall runoff pollution of the kth target pump station under the first type in the different rainfall types, and the proportion of pipeline deposition pollution of the kth target pump station under the first type in the different rainfall types. This is because the pump station under the C type (i.e. the third type) is regarded as having no domestic sewage mixed in.

[0058] Table Three By adopting the method provided in the embodiment, in the case that the pipe deposition pollution load of the target pump station in each pump station type in different rainfall types cannot be directly obtained, the pipe deposition pollution total load of the target pump station can be obtained through the total pollution load of the rainfall runoff of the target pump station, the total pollution load of the domestic source of the target pump station, and the total pollution load of the target pump station. Then, through the total pollution load of the rainfall runoff of the target pump station, the total pollution load of the domestic source of the target pump station, the total pollution load of the target pump station, and the total pollution load of the pipe deposition of the target pump station, the proportion of the overflow pollution source of the target pump station in different types in different rainfall types can be accurately analyzed, so that the proportion can provide effective guidance and suggestions for river management.

[0059] In an implementation manner, after determining the pollution load of the rainfall runoff of the target pump station in each pump station type in different rainfall types based on the rainfall runoff of each underlying surface and the pollutant concentration of each underlying surface, the method further comprises: determining the pollution sub-load of the rainfall runoff of each underlying surface of the catchment area of the target pump station in each pump station type in different rainfall types based on the rainfall runoff of each underlying surface of the catchment area of the target pump station in each pump station type in different rainfall types and the pollutant concentration of each underlying surface; and determining the proportion of the rainfall runoff sub-pollution of each underlying surface of the catchment area of the target pump station in each pump station type in different rainfall types based on the pollution sub-load of the rainfall runoff of each underlying surface of the catchment area of the target pump station in each pump station type in different rainfall types.

[0060] Taking the moderate rainfall type in different rainfall types, the first type of the kth target pump station in each pump station type, and the ith underlying surface in each underlying surface as an example, the method of determining the pollution sub-load of the rainfall runoff of each underlying surface of the catchment area of the target pump station in each pump station type in different rainfall types based on the rainfall runoff of each underlying surface of the catchment area of the target pump station in each pump station type in different rainfall types and the pollutant concentration of each underlying surface comprises: determining the pollution sub-load of the rainfall runoff of the ith underlying surface of the catchment area of the kth target pump station in the first type in the moderate rainfall type based on the rainfall runoff of the ith underlying surface of the catchment area of the kth target pump station in the first type in the moderate rainfall type, the pollutant concentration of the ith underlying surface, and the conversion unit. The unit of the rainfall runoff is cubic meters (m 3 ), and the unit of the pollutant concentration is milligrams per liter (mg / L). The specific formula is: wherein, a pollution sub-load of rainfall runoff of the i-th underlying surface of the catchment area of the k-th target pump station under the first type in the first type in the moderate rain type; a rainfall runoff of the i-th underlying surface; a pollution concentration of the i-th underlying surface; a conversion unit.

[0061] Still taking the moderate rain type in the different rainfall types, the k-th target pump station under the first type in each pump station type, and the i-th underlying surface in each underlying surface as an example, the pollution sub-load of rainfall runoff of each underlying surface based on the target pump station under each pump station type in the different rainfall types is obtained, and a proportion of sub-pollution of rainfall runoff of each underlying surface of the catchment area of the target pump station under each pump station type in the different rainfall types is obtained, including: dividing the pollution sub-load of rainfall runoff of the i-th underlying surface of the catchment area of the k-th target pump station under the first type in the moderate rain type by the pollution load of rainfall runoff of the k-th target pump station under the first type in the moderate rain type to obtain the proportion of sub-pollution of rainfall runoff of the i-th underlying surface of the catchment area of the k-th target pump station under the first type in the moderate rain type.

[0062] By using the method provided in the embodiment, the proportion of sub-pollution of rainfall runoff of each underlying surface of the catchment area of the target pump station under each pump station type in the different rainfall types can be accurately calculated. Furthermore, the proportion can provide effective guidance and suggestions for river management.

Claims

1. A rain day overflow pollution analysis and calculation method for a drainage pump station, characterized in that, The method comprises the following steps: determining at least one target pump station among a plurality of pump stations in a target river channel based on the relative positions of a target section in the target river channel and the plurality of pump stations; determining target pump stations under each pump station type among a plurality of pump station types based on the correlation between the front pool water quality of the at least one target pump station and different rainfall types in a historical period; determining the pollution load of rainfall runoff of the target pump stations under each pump station type among the different rainfall types based on the interpretation of the underlying surface of the catchment area of the target pump stations under each pump station type among the different rainfall types, and calculating the pollution load of domestic sources of the target pump stations under each pump station type among the different rainfall types; determining the proportion of a plurality of overflow pollution sources of the target pump stations under each pump station type among the different rainfall types based on the pollution load of rainfall runoff of the target pump stations under each pump station type among the different rainfall types, the pollution load of domestic sources of the target pump stations under each pump station type among the different rainfall types, and the total pollution load of the target pump stations under each pump station type among the different rainfall types, wherein the plurality of overflow pollution sources include at least one of the following: rainfall runoff pollution, domestic source pollution, and pipeline deposition pollution.

2. The method of claim 1, wherein, The method comprises the following steps: determining a plurality of candidate pump stations upstream of the target section among the plurality of pump stations based on the relative positions of the target section in the target river channel and the plurality of pump stations in the target river channel; determining at least one target pump station among the plurality of candidate pump stations based on the catchment area, drainage volume, and drainage water quality of the plurality of candidate pump stations.

3. The method of claim 2, wherein, The method comprises the following steps: determining target pump stations under each pump station type among a plurality of pump station types based on the correlation between the front pool water quality of the at least one target pump station and different rainfall types in a historical period, wherein the method comprises at least one of the following: in a case where the front pool of the kth target pump station has domestic sewage mixed in under different rainfall types and under no rainfall types in the historical period, the kth target pump station is determined as a target pump station under a first type among the plurality of pump station types, wherein k is a positive integer, and the kth target pump station is one of the at least one target pump station; in a case where the front pool of the kth target pump station has domestic sewage mixed in under different rainfall types in the historical period, and has no domestic sewage mixed in under no rainfall types in the historical period, the kth target pump station is determined as a target pump station under a second type among the plurality of pump station types; in a case where the front pool of the kth target pump station has domestic sewage mixed in only under a target rainfall type in which the rainfall amount is greater than a specified threshold among the different rainfall types in the historical period, and the mixed amount of domestic sewage is less than or equal to a mixed amount threshold, the kth target pump station is determined as a target pump station under a third type among the plurality of pump station types.

4. The method of claim 3, wherein, The underlying surface interpretation of the catchment area of the target pump station under each pump station type in the different rainfall types determines the pollution load of the rainfall runoff of the target pump station under each pump station type in the different rainfall types, including: Based on the interpretation of each underlying surface of the catchment area of the target pump station under each pump station type in the different rainfall types, the rainfall runoff of each underlying surface is determined. Based on the rainfall runoff of each underlying surface and the pollutant concentration of each underlying surface, the pollution load of the rainfall runoff of the target pump station under each pump station type in the different rainfall types is determined.

5. The method of claim 4, wherein, The calculation of the domestic source pollution load of the target pump station under each pump station type in the different rainfall types includes: Based on the total amount of drainage of the target pump station under each pump station type in the different rainfall types and the rainfall runoff of the catchment area of the target pump station under each pump station type in the different rainfall types, the domestic sewage discharge of the target pump station under each pump station type in the different rainfall types is determined. Based on the domestic sewage discharge of the target pump station under each pump station type in the different rainfall types and the pre-pool pollutant concentration in the non-rainfall type of the target pump station under each pump station type in the historical period, the domestic source pollution load of the target pump station under each pump station type in the different rainfall types is obtained.

6. The method of claim 5, wherein, Based on the pollution load of the rainfall runoff of the target pump station under each pump station type in the different rainfall types, the domestic source pollution load of the target pump station under each pump station type in the different rainfall types, and the total pollution load of the target pump station under each pump station type in the different rainfall types, the proportion of the multiple overflow pollution sources of the target pump station under each pump station type in the different rainfall types is determined, including: Based on the pollution load of the rainfall runoff of the target pump station under each pump station type in the different rainfall types, the domestic source pollution load of the target pump station under each pump station type in the different rainfall types, and the total pollution load of the target pump station under each pump station type in the different rainfall types, the pipe deposition pollution load of the target pump station under each pump station type in the different rainfall types is determined. Based on the pollution load of the rainfall runoff of the target pump station under each pump station type in the different rainfall types, the domestic source pollution load of the target pump station under each pump station type in the different rainfall types, the pipe deposition pollution load of the target pump station under each pump station type in the different rainfall types, and the total pollution load of the target pump station under each pump station type in the different rainfall types, the proportion of the multiple overflow pollution sources of the target pump station under each pump station type in the different rainfall types is determined.

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