Pollutant flux method based on fusion of full‑section sampling data and automatic water quality station data
By fusing data from full-section sampling and automatic water quality monitoring stations, a pollutant concentration conversion model was established, which solved the problems of insufficient data frequency and representativeness in the calculation of river pollutant flux and achieved accurate calculation of pollutant flux.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- BUREAU OF HYDROLOGY CHANGJIANG WATER RESOURCES COMMISSION
- Filing Date
- 2025-12-09
- Publication Date
- 2026-06-18
AI Technical Summary
In existing technologies, methods for calculating river pollutant fluxes suffer from several problems: insufficient frequency of full-section sampling data, inability to reflect pollutant change processes, insufficient representativeness of data from automatic water quality monitoring stations, inability to reflect lateral distribution, and asynchronous time-varying water volume and concentration.
A method combining full-section sampling and automatic water quality monitoring station data was adopted. By establishing a pollutant concentration conversion model, the data from the automatic water quality monitoring stations were assimilated to the full section, the pollutant concentration process was allocated, and the pollutant flux in the river was calculated.
It improves the data frequency and representativeness of river pollutant flux calculation, enabling it to reflect the lateral distribution and temporal changes of pollutants, and solves the problem of asynchronous water volume and concentration over time.
Smart Images
Figure CN2025141143_18062026_PF_FP_ABST
Abstract
Description
Pollutant flux method based on the fusion of full-section sampling and automatic water quality monitoring station data Technical Field
[0001] This invention relates to the field of water environment monitoring and analysis technology, and in particular to a pollutant flux method based on the fusion of full-section sampling and automatic water quality station data. Background Technology
[0002] The health of a river is often indicated by the presence of harmful substances dissolved in the water, and for a considerable period in the past, this was measured using pollutant concentration. However, pollutant concentration does not reflect the total amount of pollutants in a river, which is detrimental to the development of river environmental protection and management plans. Subsequently, the concept of river pollutant flux was proposed to address the issue of the amount of pollutants flowing into and out of rivers.
[0003] Currently, river pollutant flux calculations involve multiplying water volume and pollutant concentration over a specific time period. Water volume can be monitored according to standards, ensuring reliable monitoring methods, frequency, and accuracy. However, pollutant concentration monitoring, due to the uneven distribution along the river cross-section, necessitates sampling and analysis across the entire cross-section. This often involves long time intervals and fails to reflect the temporal changes in water pollutants. While automatic monitoring stations are used to monitor these changes, they are limited by factors such as river width, often employing sampling at only one or a few points along the riverbank, which cannot reflect the lateral distribution of pollutants along the cross-section. Therefore, regardless of the sampling method used, the resulting pollutant concentrations for flux calculations have inherent limitations. Summary of the Invention
[0004] The purpose of this invention is to address the shortcomings of the prior art by providing a pollutant flux method based on the fusion of full-section sampling and automatic water quality monitoring station data.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] This invention provides a pollutant flux method based on the fusion of full-section sampling and automatic water quality monitoring station data, comprising the following steps:
[0007] S1, coupling of full-section sampling and water pollutant concentration data from automatic water quality monitoring stations;
[0008] S2, water pollutant concentration data from automatic water quality monitoring stations and cross-sectional assimilation;
[0009] S3, the process distribution of water pollutant concentrations across the entire cross section;
[0010] S4. Calculation of pollutant flux in river water.
[0011] Furthermore, S1 specifically refers to:
[0012] Based on the concentration of pollutants in the whole section of water at the same sampling time (x1, x2, ... x n ) and the concentrations of water pollutants (y1, y2, ... y) at automatic water quality monitoring stations n Using quantitative statistical methods, a conversion model was established between the concentration of pollutants in the whole cross-section water and the concentration of pollutants in the water from automatic water quality monitoring stations.
[0013] Furthermore, S2 specifically refers to:
[0014] Based on the pollutant concentration (x) measured from two adjacent full-section sampling sessions i x i+1 ) and sampling time (t) i , t i+1 Between (t′1, t′2…t′) k At any given time, the concentration of water pollutants (ρ1, ρ2, ... ρ) at the automatic water quality monitoring station k A conversion model was adopted to transform the concentration of water pollutants at the entire cross-section and the concentration of water pollutants at automatic water quality monitoring stations. This model was used to convert the concentrations of water pollutants (ρ1, ρ2, ... ρ) at the automatic water quality monitoring stations. k ) is converted into the concentration of pollutants in the whole cross-section water (z1, z2, ... z k ).
[0015] Furthermore, S3 specifically involves: dividing the pollutant concentration (x) from two full-section samplings... i x i+1 ) and sampling time (t) i , t i+1 The concentrations of pollutants in the whole cross-section water (z1, z2, ... z) are between 0. k This constitutes a new time series of water pollutant concentrations across the entire cross-section (x). i ,z1,z2,…z k ,x i+1 ), calculate time Δt according to water flux. j Calculate the concentration of pollutants in the entire cross-section of the river at the corresponding time for calculating the river water flux.
[0016] Among them, T j Calculate the time Δt for water flux j The start time is located in z m and z m+1 Between, z m Calculate the time Δt for water flux j The concentration of a substance at a certain moment before the start time in the process; Calculate the time Δt for water flux j The concentration of the substance corresponding to the starting time in t′; m+1 Calculate the time Δt for water flux jAt some point after the start time in the time; T j+1 Calculate the time Δt for water flux j The termination time is located at z n-1 and z n Between, z n Calculate the time Δt for water flux j The concentration of a substance at a certain point after the termination time.
[0017] Furthermore, the time Δt is calculated based on the water flux. j Water flux Q j ,according to Calculation time Δt for water flux j The flux of pollutants.
[0018] Furthermore, in S1, the concentration of water pollutants across the entire cross-section refers to the concentration of water pollutants calculated by sampling at each or a mixture of water pollutants at multiple measuring points along a controlled cross-section using multiple vertical lines.
[0019] Furthermore, in S3, the time corresponding to the calculation of river water flux refers to the time for calculating the concentration of pollutants in the entire cross-section of water. The time is consistent with the time calculated for river water flux through linear interpolation.
[0020] Furthermore, in S3, the water flux calculation time Δt j This refers to the time frame for calculating water flux, including hours, days, ten-day periods, and months.
[0021] The beneficial effects of this invention are: it solves the problem that the frequency of full-section sampling data is insufficient in the calculation of river water pollutant flux, and therefore cannot reflect the changing process;
[0022] To address the issue that the data from automatic water quality monitoring stations used in calculating the flux of pollutants in river water are not representative enough and cannot reflect the lateral distribution;
[0023] This addresses the issue of time-varying water volume and pollutant concentration in the calculation of river water pollutant flux. Attached Figure Description
[0024] Figure 1 is a flowchart of the pollutant flux method based on the fusion of full-section sampling and automatic water quality station data;
[0025] Figure 2 is a coupled diagram of total nitrogen concentration data from comprehensive sampling at water quality station A in a certain watershed and from automatic water quality monitoring stations.
[0026] Figure 3 shows the daily total nitrogen flux at water quality station A in a certain watershed. Detailed Implementation
[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.
[0028] As shown in Figure 1, the pollutant flux method based on the fusion of full-section sampling and automatic water quality monitoring station data includes the following steps:
[0029] S1, coupling of full-section sampling and water pollutant concentration data from automatic water quality monitoring stations;
[0030] S2, water pollutant concentration data from automatic water quality monitoring stations and cross-sectional assimilation;
[0031] S3, the process distribution of water pollutant concentrations across the entire cross section;
[0032] S4. Calculation of pollutant flux in river water.
[0033] Specifically, S1 is:
[0034] Based on the concentration of pollutants in the whole section of water at the same sampling time (x1, x2, ... x n ) and the concentrations of water pollutants (y1, y2, ... y) at automatic water quality monitoring stations n Using quantitative statistical methods, a conversion model was established between the concentration of pollutants in the whole cross-section water and the concentration of pollutants in the water from automatic water quality monitoring stations.
[0035] Full-section water pollutants refer to various harmful substances or energies dissolved in river water that cause deterioration of water quality, aquatic biological communities, and bottom sediment quality, including salt, trace elements, or radioactive substances in the water.
[0036] The concentration of water pollutants across the entire cross-section is obtained by sampling at multiple points along a vertical line on the control section, detecting the concentration of water pollutants at each point or in combination at the points, and then calculating the concentration of water pollutants.
[0037] Same sampling time means that the sampling time of the full section is the same as that of the automatic water quality monitoring station. If the sampling time of the full section is not much different from that of the automatic water quality monitoring station, the sampling data of the automatic water quality monitoring station corresponding to the sampling time of the new section can be derived by using the two sampling data of the automatic water quality monitoring station before and after the full section sampling time and the process linear interpolation method, so as to achieve the same sampling time.
[0038] Specifically, S2 is:
[0039] Based on the pollutant concentration (x) measured from two adjacent full-section sampling sessions i x i+1 ) and sampling time (t) i , t i+1Between (t′1, t′2…t′) k At any given time, the concentration of water pollutants (ρ1, ρ2, ... ρ) at the automatic water quality monitoring station k A conversion model was adopted to transform the concentration of water pollutants at the entire cross-section and the concentration of water pollutants at automatic water quality monitoring stations. This model was used to convert the concentrations of water pollutants (ρ1, ρ2, ... ρ) at the automatic water quality monitoring stations. k ) is converted into the concentration of pollutants in the whole cross-section water (z1, z2, ... z k ).
[0040] The concentration of water pollutants at automatic water quality monitoring stations refers to the concentration of water pollutants calculated using automatic water quality monitoring stations located along rivers, through single-point sampling or mixed sampling at a few points.
[0041] Specifically, S3 involves: [converting the pollutant concentration (x) from two full-section samplings]. i x i+1 ) and sampling time (t) i , t i+1 The concentrations of pollutants in the whole cross-section water (z1, z2, ... z) are between 0. k This constitutes a new time series of water pollutant concentrations across the entire cross-section (x). i ,z1,z2,…z k ,x i+1 ), calculate time Δt according to river water flux. j Calculate the concentration of pollutants in the entire cross-section of the river at the corresponding time for calculating the river water flux.
[0042] Among them, T j Calculate the time Δt for water flux j The start time is located in z m and z m+1 between;
[0043] z m Calculate the time Δt for water flux j The concentration of a substance at a certain moment before the start time in the process; Calculate the time Δt for water flux j The concentration of the substance corresponding to the starting time in t′; m+1 Calculate the time Δt for water flux j At some point after the start time in the time; T j+1 Calculate the time Δt for water flux j The termination time is located at z n-1 and z n Between, z n Calculate the time Δt for water flux j The concentration of a substance at a certain point after the termination time; t′ n-1Calculate the time Δt for water flux j A certain moment before the end time in the process.
[0044] The time frame for calculating river water flux refers to the time frame for calculating the concentration of pollutants in the entire cross-section of the water. The time is consistent with the calculation time of river water flux through linear interpolation.
[0045] Calculate time Δt based on water flux. j Water flux Q j ,according to Calculation of water flux calculation time Δt j The flux of pollutants.
[0046] In S1, the concentration of water pollutants across the entire cross section refers to the concentration of water pollutants calculated by sampling at multiple points along the control section using multiple vertical lines and multiple measuring points along the vertical lines, detecting the concentration of water pollutants at each measuring point or a mixture of measuring points.
[0047] In S3, the corresponding time for calculating river water flux refers to the time for calculating the concentration of pollutants in the entire cross-section of water. The time is consistent with the calculation time of river water flux through linear interpolation.
[0048] In S3, the water flux calculation time Δt j This refers to the time frame for calculating water flux, including hours, days, ten-day periods, and months.
[0049] Example 1
[0050] Taking the total nitrogen index at water quality station A in a certain watershed as an example, six manual monitoring operations were conducted at this section at 10:00 on June 1st, 6th, 12th, 18th, 24th, and 30th. The total nitrogen concentrations were (1.83 mg / L, 1.90 mg / L, 1.57 mg / L, 0.91 mg / L, 1.23 mg / L, and 1.32 mg / L). The total nitrogen concentrations at water quality station A at the same sampling time were (1.87 mg / L, 1.88 mg / L, 1.53 mg / L, 1.01 mg / L, 1.20 mg / L, and 1.37 mg / L). Using the linear fitting method, the automatic station monitoring data y was restored by referring to the manual monitoring data, resulting in the corrected automatic station monitoring data Y = 1.0610x - 0.1067, as shown in Figure 2.
[0051] Based on the conversion relationship, the total nitrogen concentration of the automatic water quality monitoring station is converted into the total nitrogen concentration of the entire cross-section (1.88 mg / L, 1.89 mg / L, 1.52 mg / L, 0.96 mg / L, 1.17 mg / L, 1.35 mg / L).
[0052] Based on the monitoring data from the hydrological station near water quality station A, the average flow rate for the corresponding time period was calculated. If the time length for calculating water flux is one month, the total nitrogen concentration monitored at water quality station A on June 1 was 1.87 mg / L and the total nitrogen concentration monitored on June 30 was 1.82 mg / L. The daily concentration from June 1 to June 30 was calculated using the interpolation method.
[0053] The daily total nitrogen flux was calculated based on the daily total nitrogen concentration obtained by interpolation and the daily average flow rate of the water quality station, as shown in Figure 3.
[0054] The embodiments described above are merely illustrative of implementation methods of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be defined by the appended claims.
Claims
1. A pollutant flux method based on the fusion of full-section sampling and automatic water quality monitoring station data, characterized in that, Includes the following steps: S1, coupling of full-section sampling and water pollutant concentration data from automatic water quality monitoring stations; S2, water pollutant concentration data from automatic water quality monitoring stations and cross-sectional assimilation; S3, the process distribution of water pollutant concentrations across the entire cross section; S4. Calculation of pollutant flux in river water.
2. The pollutant flux method based on full-section sampling and automatic water quality monitoring station data fusion as described in claim 1, characterized in that, Specifically, S1 is: Based on the concentration of pollutants in the whole section of water at the same sampling time (x1, x2, ... x n ) and the concentrations of water pollutants (y1, y2, ... y) at automatic water quality monitoring stations n Using a sequence of quantitative statistical methods, a conversion model was established between the concentration of pollutants in the whole cross-section of water and the concentration of pollutants in water from automatic water quality monitoring stations.
3. The pollutant flux method based on full-section sampling and automatic water quality station data fusion as described in claim 2, characterized in that, Specifically, S2 is: Based on the pollutant concentration (x) measured from two adjacent full-section sampling sessions i x i+1 ) and sampling time (t) i , t i+1 Between (t′1, t′2…t′) k At any given time, the concentration of water pollutants (ρ1, ρ2, ... ρ) at the automatic water quality monitoring station k A conversion model was adopted to transform the concentration of water pollutants at the entire cross-section and the concentration of water pollutants at automatic water quality monitoring stations. This model was used to convert the concentrations of water pollutants (ρ1, ρ2, ... ρ) at the automatic water quality monitoring stations. k ) is converted into the concentration of pollutants in the whole cross-section water (z1, z2, ... z k ).
4. The pollutant flux method based on full-section sampling and automatic water quality station data fusion as described in claim 3, characterized in that, Specifically, S3 involves: [converting the pollutant concentration (x) from two full-section samplings]. i x i+1 ) and sampling time (t) i , t i+1 The concentrations of pollutants in the whole cross-section water (z1, z2, ... z) are between 0. k This constitutes a new time series of water pollutant concentrations across the entire cross-section (x). i ,z1,z2,…z k ,x i+1 ), calculate time Δt according to water flux. j Calculate the concentration of pollutants in the entire cross-section of the river at the corresponding time for calculating the river water flux. Among them, T j Calculate the time Δt for water flux j The start time is located in z m and z m+1 Between; z m Calculate the time Δt for water flux j The concentration of a substance at a certain moment before the start time in the process; Calculate the time Δt for water flux j The concentration of the substance corresponding to the starting time in t′; m+1 Calculate the time Δt for water flux j At some point after the start time in the time; T j+1 Calculate the time Δt for water flux j The termination time is located at z n-1 and z n Between; z n Calculate the time Δt for water flux j The concentration of a substance at a certain point after the termination time; t′ n-1 Calculate the time Δt for water flux j A certain moment before the end time in the process.
5. The pollutant flux method based on the fusion of full-section sampling and automatic water quality monitoring station data as described in claim 4, characterized in that: Calculate time Δt based on water flux. j Water flux Q j ,according to Calculation time Δt for water flux j The flux of pollutants.
6. The pollutant flux method based on the fusion of full-section sampling and automatic water quality monitoring station data as described in claim 5, characterized in that: In S1, the concentration of water pollutants across the entire cross section refers to the concentration of water pollutants calculated by sampling at multiple points along the control section using multiple vertical lines and multiple measuring points along the vertical lines, detecting the concentration of water pollutants at each measuring point or a mixture of measuring points.
7. The pollutant flux method based on the fusion of full-section sampling and automatic water quality monitoring station data as described in claim 6, characterized in that: In S3, the corresponding time for calculating river water flux refers to the time for calculating the concentration of pollutants in the entire cross-section of water. The time is consistent with the time calculated for river water flux through linear interpolation.
8. The pollutant flux method based on the fusion of full-section sampling and automatic water quality monitoring station data as described in claim 7, characterized in that: In S3, the water flux calculation time Δt j This refers to the time frame for calculating water flux, including hours, days, ten-day periods, and months.