Pollutant flux method based on full-section sampling and water quality automatic station data fusion

Abstract

The present invention provides a pollutant flux method based on full-section sampling and water quality automatic station data fusion, comprising the following steps: coupling of full-section sampling and water pollutant concentration data from water quality automatic stations; assimilation of water pollutant concentration data from water quality automatic stations and full-section; full-section water pollutant concentration process distribution; river water pollutant flux calculation; solving the problem that the frequency of full-section sampling data used in river water pollutant flux calculation is insufficient and cannot reflect the change process.

Description

Technical Field

[0001] The present invention relates to the technical field of water environment monitoring and analysis, and in particular to a pollutant flux method based on full-section sampling and water quality automatic station data fusion. Background Art

[0002] Whether a river is healthy is usually indicated by whether there are harmful substances dissolved in the water. For a long time in the past, it was measured by the concentration of pollutants. However, the concentration of pollutants cannot reflect the total amount of pollutants in the river, which is not conducive to the formulation of river environmental protection and management plans. Subsequently, the concept of river pollutant flux was proposed to solve the problem of the amount of pollutants flowing into and out of the river.

[0003] At present, the flux of river pollutants is calculated by multiplying the water volume and the concentration of pollutants in a certain period of time. The water volume can be monitored according to the standard, and the monitoring method, measurement frequency and accuracy can be guaranteed. For the monitoring of pollutant concentration, in view of the uneven distribution along the cross section, it is advisable to sample and analyze the entire cross section. The time interval is often long and cannot reflect the time change process of water pollutants. In order to monitor the change process of water pollutants, the use of automatic station monitoring is limited by various factors such as the width of the river surface. Most of them adopt one or a few sampling points at the waterside, which cannot reflect the lateral distribution of water pollutants along the cross section. Therefore, no matter what sampling method is used to analyze the concentration of pollutants for flux calculation, there are certain defects. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art and provide a pollutant flux method based on full-section sampling and water quality automatic station data fusion.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a pollutant flux method based on full-section sampling and water quality automatic station data fusion, comprising the following steps:

[0007] S1. Coupling of full-section sampling and water pollutant concentration data from automatic water quality stations;

[0008] S2, water pollutant concentration data from automatic water quality stations and full section assimilation;

[0009] S3, distribution of water pollutant concentration process in the whole section;

[0010] S4. Calculation of pollutant flux in river water.

[0011] Further, the S1 is specifically:

[0012] According to the concentration of water pollutants in the whole section at the same sampling time and water quality automatic station water pollutant concentration Sequence, using quantitative statistical methods, to establish a conversion model between the concentration of water pollutants in the entire section and the concentration of water pollutants in the automatic water quality station;

[0013] Further, the S2 is specifically:

[0014] Pollutant concentrations based on sampling measurements of two adjacent full sections and sampling time between Water quality automatic station water pollutant concentration at all times , using the full section water pollutant concentration and water quality automatic station water pollutant concentration conversion model, the water quality automatic station water pollutant concentration Converted to the concentration of water pollutants in the entire section .

[0015] Furthermore, S3 specifically comprises: converting the pollutant concentrations of the two full-section samplings into And the sampling time Concentration of water pollutants in the entire section , forming a new time series of water pollutant concentrations in the entire section , calculated according to the water flux time , calculate the river water flux and calculate the concentration of water pollutants in the entire section at the corresponding time :

[0016] ;

[0017] in, Calculate time for water flux The starting time is located at and between, Calculate time for water flux The substance concentration corresponding to a certain moment before the start time in ; Calculate time for water flux The substance concentration corresponding to the starting time in ; Calculate time for water flux A moment after the start time in ; Calculate time for water flux The end time is located at and between, Calculate time for water flux The concentration of a substance at a certain moment after the end time.

[0018] Further, the time is calculated based on the water flux Water flux ,according to Calculation time of water flux The flux of pollutants.

[0019] Furthermore, in S1, the water pollutant concentration in the entire section refers to the water pollutant concentration calculated by arranging multiple vertical lines on the control section and arranging multiple measuring points for sampling, detecting the water pollutant concentration at each measuring point or the mixed water pollutant concentration at the measuring points.

[0020] Furthermore, in S3, the corresponding time for calculating the river water flux refers to the time for calculating the concentration of water pollutants in the entire section. The time is consistent with the river water flux calculation time through linear interpolation.

[0021] Further, in S3, the water flux calculation time , refers to the length of time for calculating water flux, including hours, days, ten days, and months.

[0022] The beneficial effects of the present invention are: solving the problem that the frequency of full-section sampling data used in the calculation of river water pollutant flux is insufficient and cannot reflect the change process;

[0023] Solve the problem that the cross-section of water quality automatic station data used in the calculation of river water pollutant flux is not representative enough and cannot reflect the lateral distribution;

[0024] Solve the problem of time asynchrony between water volume and water pollutant concentration in river water pollutant flux calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a flow chart of the pollutant flux method based on full-section sampling and water quality automatic station data fusion;

[0026] Figure 2 This is a coupling diagram of the total nitrogen concentration data of the comprehensive sampling of water quality station A in a certain river basin and the automatic water quality station;

[0027] Figure 3 This is the daily total nitrogen flux map for water quality station A in a certain river basin. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] like Figure 1 As shown in the figure, the pollutant flux method based on full-section sampling and water quality automatic station data fusion includes the following steps:

[0030] S1. Coupling of full-section sampling and water pollutant concentration data from automatic water quality stations;

[0031] S2, water pollutant concentration data from automatic water quality stations and full section assimilation;

[0032] S3, distribution of water pollutant concentration process in the whole section;

[0033] S4. Calculation of pollutant flux in river water.

[0034] The S1 is specifically:

[0035] According to the concentration of water pollutants in the whole section at the same sampling time and water quality automatic station water pollutant concentration Sequence, using quantitative statistical methods, to establish a conversion model between the concentration of water pollutants in the entire section and the concentration of water pollutants in the automatic water quality station;

[0036] Full-section water pollutants refer to various harmful substances or energy that are dissolved in river water and cause the deterioration of water quality, aquatic biological communities and bottom sediment quality, including salt, trace elements or radioactive substances in the water.

[0037] The concentration of water pollutants in the entire section is calculated by arranging multiple vertical lines on the control section, arranging multiple measuring points for sampling, detecting the concentration of water pollutants at each measuring point or the mixed water pollutants at the measuring points.

[0038] The same sampling time means that the sampling time of the full-section sampling is the same as that of the automatic water quality station; if the difference between the sampling time of the full-section sampling and that of the automatic water quality station is not much, the sampling data of the automatic water quality station twice before and after the full-section sampling time are used to infer the sampling data of the automatic water quality station corresponding to the new section sampling time according to the process linear interpolation method to achieve the same sampling time.

[0039] The S2 is specifically:

[0040] Pollutant concentrations based on sampling measurements of two adjacent full sections and sampling time between Water quality automatic station water pollutant concentration at all times , using the full section water pollutant concentration and water quality automatic station water pollutant concentration conversion model, the water quality automatic station water pollutant concentration Converted to the concentration of water pollutants in the entire section .

[0041] The concentration of water pollutants at the automatic water quality station refers to the concentration of water pollutants calculated by using a water quality automatic monitoring station arranged at the riverside through single-point sampling or a few-point mixed sampling tests.

[0042] S3 specifically includes: the pollutant concentration of the two full-section samplings And the sampling time Concentration of water pollutants in the entire section , forming a new time series of water pollutant concentrations in the entire section , calculated according to the river water flux , calculate the river water flux and calculate the concentration of water pollutants in the entire section at the corresponding time :

[0043] ;

[0044] in, Calculate time for water flux The starting time is located at and between;

[0045] Calculate time for water flux The substance concentration corresponding to a certain moment before the start time in ; Calculate time for water flux The substance concentration corresponding to the starting time in ; Calculate time for water flux A moment after the start time in ; Calculate time for water flux The end time is located at and between, Calculate time for water flux The concentration of a substance at a certain moment after the end time of Calculate time for water flux A moment before the end time in .

[0046] Calculating the corresponding time of river water flux means calculating the concentration of water pollutants in the entire section. The time is consistent with the river water flux calculation time through linear interpolation.

[0047] Calculate time based on water flux Water flux ,according to Calculation time of water flux The flux of pollutants.

[0048] In S1, the whole section water pollutant concentration refers to the water pollutant concentration calculated by arranging multiple vertical lines on the control section and arranging multiple measuring points for sampling, detecting the concentration of water pollutants at each measuring point or the mixed water pollutants at the measuring points.

[0049] In S3, the corresponding time of river water flux calculation refers to the calculation of the concentration of water pollutants in the entire section. The time is consistent with the river water flux calculation time through linear interpolation.

[0050] In S3, water flux calculation time , refers to the length of time for calculating water flux, including hours, days, ten days, and months.

[0051] Embodiment 1

[0052] Taking the total nitrogen index of water quality station A in a certain river basin as an example, six manual monitorings were carried out at the section at 10:00 on June 1, 10:00 on June 6, 10:00 on June 12, 10:00 on June 18, 10:00 on June 24 and 10:00 on June 30, and 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, 1.32 mg / L). The total nitrogen concentrations at the same sampling time at water quality station A were (1.87 mg / L, 1.88 mg / L, 1.53 mg / L, 1.01 mg / L, 1.20 mg / L, 1.37 mg / L). The linear fitting method was used to refer to the manual monitoring data to convert the automatic station monitoring data Restore and obtain the corrected automatic station monitoring data ,like Figure 2 ;

[0053] According to the conversion relationship, the total nitrogen concentration of the automatic water quality station is converted into the total nitrogen concentration of the entire 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).

[0054] According to the monitoring data of the hydrological station near water quality station A, the flow mean for the corresponding time period is taken. For example, if the time length for calculating water flux is month, the total nitrogen concentration monitored by 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 interpolation method is used to calculate the daily concentration from June 1 to June 30.

[0055] According to the daily total nitrogen concentration obtained by interpolation and the daily average flow rate of the water quality station, the daily total nitrogen flux was calculated, such as Figure 3 .

[0056] The above-mentioned embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be based on the attached claims.

Claims

1. A pollutant flux calculation method based on full-section sampling and water quality automatic station data fusion, characterized in that: The following steps are involved: S1. Coupling of full-section sampling and water pollutant concentration data from automatic water quality stations; S2, water pollutant concentration data from automatic water quality stations and full section assimilation; S3, distribution of water pollutant concentration process in the whole section; S4. Calculation of river water pollutant flux; S3 specifically includes: the pollutant concentration of the two full-section samplings And the sampling time Concentration of water pollutants in the entire section , forming a new time series of water pollutant concentrations in the entire section , calculated according to the water flux time , calculate the river water flux and calculate the concentration of water pollutants in the entire section at the corresponding time : ； in, Calculate time for water flux The starting time is located at and between; Calculate time for water flux The substance concentration corresponding to a certain moment before the start time in ; Calculate time for water flux The substance concentration corresponding to the starting time in ; Calculate time for water flux A moment after the start time in ; Calculate time for water flux The end time is located at and between; Calculate time for water flux The concentration of a substance at a certain moment after the end time of Calculate time for water flux A moment before the end time in ; Calculate time based on water flux Water flux ,according to Calculation time of water flux The flux of pollutants.

2. The pollutant flux calculation method based on full-section sampling and water quality automatic station data fusion according to claim 1 is characterized in that: The S1 is specifically: According to the concentration of water pollutants in the whole section at the same sampling time and water quality automatic station water pollutant concentration Sequence, using quantitative statistical methods, to establish the whole section of the water pollutant concentration and the automatic water quality station water pollutant concentration conversion model.

3. The pollutant flux calculation method based on full-section sampling and water quality automatic station data fusion according to claim 2 is characterized in that: The S2 is specifically: Pollutant concentrations based on sampling measurements of two adjacent full sections and sampling time between Water quality automatic station water pollutant concentration at all times , using the full section water pollutant concentration and water quality automatic station water pollutant concentration conversion model, the water quality automatic station water pollutant concentration Converted to the concentration of water pollutants in the entire section .

4. The pollutant flux calculation method based on full-section sampling and water quality automatic station data fusion according to claim 3 is characterized by: In S1, the whole section water pollutant concentration refers to the water pollutant concentration calculated by arranging multiple vertical lines on the control section and arranging multiple measuring points for sampling, detecting the concentration of water pollutants at each measuring point or the mixed water pollutant concentration at the measuring points.

5. The pollutant flux calculation method based on full-section sampling and water quality automatic station data fusion according to claim 4 is characterized by: In S3, the corresponding time of river water flux calculation refers to the calculation of the concentration of water pollutants in the entire section. The time is consistent with the river water flux calculation time through linear interpolation.

6. The pollutant flux calculation method based on full-section sampling and water quality automatic station data fusion according to claim 5 is characterized by: In S3, water flux calculation time , refers to the length of time for calculating water flux, including hours, days, ten days, and months.

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