CN110991887A - Ash water footprint measuring and calculating method for non-point source pollution discharge river reach - Google Patents
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Abstract
The invention discloses a method for measuring and calculating a grey water footprint of a non-point source pollution discharge river reach, which comprises the following steps of: acquiring basic data of a non-point source pollution discharge river reach to be measured; extracting grey water footprint accounting parameters in the basic data; and calculating the grey water footprint of the non-point source pollution discharge river reach to be detected by using a non-point source grey water footprint calculation formula based on grey water footprint calculation parameters, wherein the non-point source grey water footprint calculation formula is obtained based on a non-point source pollution discharge load migration and conversion mechanism, a migration attenuation effect of non-point source pollutants entering a river along a river bank and in the river channel, and a non-point source pollution discharge load and control section water quality response relation. The method for measuring and calculating the grey water footprint of the non-point source pollution discharge river reach provided by the embodiment of the invention can reflect the discharge of non-point source pollutants and the migration and conversion process after entering a river, finely measure the space-time change of the grey water footprint and reduce the measurement and calculation error of the grey water footprint of the non-point source pollution discharge river reach.
Description
Technical Field
The invention relates to the field of water environment protection, in particular to a method for measuring and calculating a grey water footprint of a non-point source pollution discharge river reach.
Background
The Grey Water Footprint (GWF) is an index related to Water pollution and represents the environmental influence of the economic and social pollution discharge process on Water bodies such as rivers, lakes and the like. The grey water footprint is generally defined as the volume of fresh water required to dilute a certain pollution load above a certain environmental water quality standard, based on natural background concentrations and existing environmental water quality standards. Therefore, the consumption of the pollutant carrying capacity of the natural water body caused by sewage discharge, namely the pressure effect on the water environment, can be quantitatively evaluated based on grey water footprint calculation. The water footprint evaluation quantifies the influence of sewage discharge on the water body into water quantity, and can more intuitively reflect the stress degree of water pollution on the water resource water environment. According to the Water footprint evaluation handbook published by the national Water footprint network, it is believed that the degree and scale of water pollution can be reflected by the amount of fresh water required to dilute the pollutants to be harmless. The specific accounting formula is as follows:
wherein GWF is the gray water footprint (m)3Year);load is the discharge capacity (kg/year); rhosIs the water quality standard concentration (kg/m) of the pollutants3)；ρnThe natural background water quality concentration (kg/m) of the receiving water body3). In the prior art, the river water pollution process mechanism under non-point source emission is not considered sufficiently, the method takes the water quantity required by diluting pollutants to the water quality standard as the water footprint of sewage emission, however, in practice, the non-point source pollution load is continuously moved and reduced along with water flow after being discharged from the riverway along the bank to the water body, and the water environment management mainly aims at a fixed water quality section to check whether the water body reaches the standard or meets the water environment function. Therefore, the method cannot reflect the non-point source pollutant discharge and the migration and conversion process after entering the river, influences the reliability of the water footprint measurement result, is difficult to measure the space-time change of the grey water footprint finely, and cannot effectively quantify the grey water footprint of non-point source load discharge in the small-scale unit.
Disclosure of Invention
Therefore, the invention aims to solve the technical problem that the prior art cannot reflect the migration and transformation process of non-point source pollutants discharged into a river and is difficult to measure the space-time change of the grey water footprint in a refined manner, thereby providing a grey water footprint measuring and calculating method for a non-point source pollution discharge river section.
In order to achieve the purpose, the invention provides the following technical scheme:
the embodiment of the invention provides a method for measuring and calculating a grey water footprint of a non-point source pollution discharge river reach, which comprises the following steps: acquiring basic data of a non-point source pollution discharge river reach to be measured; extracting grey water footprint accounting parameters from the basic data; and calculating the grey water footprint of the non-point source pollution discharge river reach to be detected by using a non-point source grey water footprint calculation formula based on grey water footprint calculation parameters, wherein the non-point source grey water footprint calculation formula is obtained based on a non-point source pollution discharge load migration and conversion mechanism, a migration attenuation effect of non-point source pollutants entering the river along the river bank and in the river channel, and a non-point source pollution discharge load and control section water quality response relation.
In one embodiment, the base data includes: the method comprises the following steps of (1) spatial data, pollution data and hydrological data, wherein the spatial data comprise river channel position information and river reach control section positions; the pollution data comprises the discharge capacity, the background concentration of the incoming water and the water quality standard of the control section; the hydrologic data includes the flow rate of the river segment.
In an embodiment, the grey water footprint accounting parameters include: background concentration of pollutants in water coming from the upstream of the reference section, water environment quality standard concentration of pollutants of the control section, comprehensive attenuation coefficient of pollutants, distance from the control section to the reference section and design average flow velocity of a river reach.
In one embodiment, the non-point source grey water footprint accounting formula is:
wherein, GWFnpsThe flow rate of the grey water footprint is shown, and M is the non-point source sewage discharge amount of the river reach; r is the accumulated attenuation coefficient of the pollutants along the way; csControlling the water environment quality standard concentration of the cross-section pollutants; mu is the average flow speed designed for the river reach; c0Background concentration of pollutants in the incoming water upstream of the reference section; k is the comprehensive attenuation coefficient of the pollutants; and x is the distance from the control section to the reference section.
In one embodiment, the cumulative attenuation coefficient R of the contaminant along the way is represented by the following formula:
wherein k is a comprehensive attenuation coefficient of the pollutants; x is the distance from the control section to the reference section; mu is the designed average flow velocity of the river reach.
In one embodiment, the integrated attenuation coefficient k of the contaminant is analytically or experimentally determined.
The invention provides a method for measuring and calculating a grey water footprint of a non-point source pollution discharge river reach, which comprises the following steps of: acquiring basic data of a non-point source pollution discharge river reach to be measured; extracting grey water footprint accounting parameters from the basic data; and calculating the grey water footprint of the non-point source pollution discharge river reach to be detected by using a non-point source grey water footprint calculation formula based on the grey water footprint calculation parameters, wherein the non-point source grey water footprint calculation formula is obtained based on a non-point source pollution discharge load migration and conversion mechanism, a migration attenuation effect of non-point source pollutants entering the river along the river bank and in the river channel, and a non-point source pollution discharge load and control section water quality response relation. The method for measuring and calculating the gray water footprint of the non-point source pollution discharge river reach aims at the influence of non-point source pollution discharge on the water quality of the controlled river reach in the year of two banks of the river by adopting the migration and conversion equation of the non-point source pollution discharge load of the river, solves the problem that the non-point source pollution load continuously moves and is reduced along with the water flow after being discharged from the edge of the river to the water body, can reflect the migration and conversion process of the non-point source pollutant after being discharged into the river, finely measures the space-time change of the gray water footprint, and reduces the error of the gray water footprint of the non.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of measuring and calculating the grey water footprint of non-point source pollution discharge provided by an embodiment of the invention;
fig. 2 is a flowchart of a specific example of a grey water footprint calculation method for a non-point source blowdown river reach according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Examples
The embodiment of the invention provides a method for calculating a grey water footprint of a non-point source pollution discharge river reach, which takes a non-point source pollution discharge process of a certain river reach as an example and takes a typical pollutant chemical demand (COD) as an example to carry out grey water footprint accounting. As shown in fig. 2, the estimation method includes the following steps:
and step S1, acquiring basic data of the non-point source sewage river reach to be measured.
In an embodiment of the present invention, the basic data includes: the method comprises the following steps of (1) spatial data, pollution data and hydrological data, wherein the spatial data comprise river channel position information and river reach control section positions; the pollution data comprises the discharge capacity, the background concentration of the incoming water and the water quality standard of the control section; the hydrological data include the flow rate of the river section to be tested, as shown in the following table:
step S2, extracting grey water footprint accounting parameters from the base data.
In an embodiment of the invention, the grey water footprint accounting parameters comprise: the pollutant background concentration in the coming water of benchmark section upper reaches, the water environment quality standard concentration of control section pollutant, pollutant comprehensive attenuation coefficient, the distance and the river reach design average flow velocity of control section to benchmark section, wherein:
background concentration of contaminants in incoming water upstream of the reference section (C)0mg/L): determining the background concentration data of the incoming water according to the collected pollution data of the reference section;
controlling water environment quality standard concentration (C) of section pollutantsmg/L): determining according to the standard of water quality of a control section in the collected pollution data;
integrated contaminant attenuation coefficient (k, 1/d): can be determined by analysis and actual measurement; the analysis borrowing method is adopted after relevant data in the past work and research of the calculated water area are analyzed and checked, and when the data of the calculated water area is unavailable, the data of adjacent rivers with similar hydraulic characteristics, pollution conditions, geography and meteorological conditions can be borrowed. The biochemical oxygen demand (COD) degradation coefficient is generally 0.10-0.14/d; the actual measurement method comprises the steps of selecting a sub-river reach for checking that a river channel at a middle section of the river reach is straight, the water flow is stable, no branch flows are converged in the middle section, and no sewage discharge outlet is formed, respectively arranging sampling points at the upstream (point A) and the downstream (point B) of the sub-river reach, monitoring the concentration value of pollutants, simultaneously testing hydrological parameters to determine the average flow velocity of a cross section, and calculating according to the following formula:
in the formula: k is the comprehensive attenuation coefficient of pollutants, 1/d; cA-upper section contaminant concentration, mg/L; cB-lower section contaminant concentration, mg/L; l-sub-river reach length, km; v-average sub-river reach flow velocity, km/d;
control section to reference section distance (x, m): according to the collected water system shp format data, the position data of the sewage draining exit and the control section, the embodiment of the invention utilizes ArcGIS software tools to identify the river channel distribution from the sewage draining exit (reference section) to the control section, and calculates the actual length of the river reach based on the ArcGIS geographic analysis function; river reach design average flow velocity (μ, m/s): collecting the average value of the historical monitoring flow rate of the neighboring hydrological station in the 10-year rich period as the design average flow rate; for the situation that the hydrological station is far away or has no historical monitoring, the hydrological station can be obtained by adopting a field monitoring mode aiming at the rich water period.
And S3, calculating the grey water footprint of the non-point source pollution discharge river section to be detected by using a non-point source grey water footprint calculation formula based on the grey water footprint calculation parameters, wherein the non-point source grey water footprint calculation formula is obtained based on a non-point source pollution discharge load migration and conversion mechanism, a migration attenuation effect of non-point source pollutants entering the river along the river bank and in the river channel, and a non-point source pollution discharge load and control section water quality response relation.
In the embodiment of the invention, the non-point source grey water footprint accounting formula is as follows:
wherein, GWFnpsThe flow rate of the grey water footprint is shown, and M is the non-point source sewage discharge amount of the river reach; r is the accumulated attenuation coefficient of the pollutants along the way; csControlling the water environment quality standard concentration of the cross-section pollutants; mu is the average flow speed designed for the river reach; c0Background concentration of pollutants in the incoming water upstream of the reference section; k is the comprehensive attenuation coefficient of the pollutants; x is the distance from the control section to the reference section;
the non-point source grey water footprint accounting formula is composed of
The conversion of the formula is obtained by inverse conversion, wherein the conversion of the formula is obtained by a mathematical expression that non-point source load mainly discharges from a river along the bank into the river, and then pollutants are longitudinally migrated and converted along the river under the condition of steady state or quasi-steady state, and the mathematical expression is as follows:
in an embodiment of the present invention, the in-path cumulative attenuation coefficient R of the contaminant is represented by the following formula:
wherein k is a comprehensive attenuation coefficient of the pollutants; x is the distance from the control section to the reference section; mu is the designed average flow velocity of the river reach.
In one embodiment, the background concentration of pollutants in the incoming water upstream of the reference cross section is 30mg/L according to the background concentration of COD in the incoming water in the collected pollution data of the reference cross section; controlling the water environment quality standard concentration of the cross-section pollutants: determining the water quality standard of a control section in the collected pollution data as surface water V type, wherein the COD concentration of the surface water V type is 40 mg/L; integrated contaminant attenuation coefficient (k, 1/d): and analyzing and borrowing related literature data by adopting an analysis borrowing method to determine that the COD degradation coefficient of the river reach is 0.12/d. Controlling the distance from the section to the reference section: calculating the actual length of the river reach to be 15200m based on the ArcGIS geographic analysis function according to the collected water system shp format data, the position data of the sewage discharge outlet and the control section; river reach design average flow velocity (μ, m/s): and aiming at the field monitoring result of the water-rich period, the average flow velocity is 0.3 m/s.
And (3) carrying out grey water footprint measurement based on the collected grey water footprint accounting parameters:
calculating to obtain the grey water footprint accounting result of 1.206881m generated when the non-point source load (1300000g/d) of the river reach enters the river3Is further converted to a day scale of 104274.5m3/d。
When the water quality target of the river channel control section is COD 40mg/L, the river section non-point source pollution discharge load (1300000g/d) is discharged along the river and fully diluted, and then is subjected to migration attenuation until the water quality target meets the upstream of the reference section required by the water environment quality standard of the control sectionThe inflow rate of water is 1.206881m3(background concentration: COD 30 mg/L). Furthermore, the actually measured upper and lower section data of the river reach and the non-point source sewage discharge data are checked, the result of the measuring and calculating method is basically consistent with the average flow of the river reach in the same scene, and the scientificity of the method can be verified.
The calculation result according to the traditional grey water footprint accounting formula only considering the dilution effect of pollutants is as follows:
therefore, the gray water footprint measured by the original method is higher than the measured result of the method of the invention, and is not in line with the actual situation. The method mainly comprises the steps that a migration and conversion process of non-point source loads along a river is not considered, so that an original measuring and calculating method cannot realize differentiated measuring and calculating under the condition of considering different section water quality standards of different river sections in space, and measuring and calculating results are relatively extensive.
According to the grey water footprint result obtained by measurement and calculation through the measurement and calculation method provided by the invention, in the application of water environment management, the average flow of the river reach 1.206881m during load discharge period can be guaranteed through expressions such as water quantity scheduling or water source conservation and the like under the non-point source discharge intensity3S (or 104274.5 m)3And d), the water quality of the downstream control section can reach the standard, and a basis can be provided for formulating a refined water environment control working scheme.
According to the method for measuring and calculating the gray water footprint of the non-point source pollution discharge river reach, the influence of non-point source pollution discharge on the water quality of the controlled river reach in the year of two banks of the river is solved by adopting a non-point source pollution discharge load migration and conversion equation of the river, the problem that the non-point source pollution load continuously moves and is reduced along with the water flow after being discharged from the riverway along the banks is solved, the migration and conversion process of non-point source pollutants discharged into the river can be reflected, the space-time change of the gray water footprint is finely measured, and the measurement and calculation error of the gray water footprint of the non-point.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (6)
1. A method for measuring and calculating grey water footprints of a non-point source pollution discharge river section is characterized by comprising the following steps:
acquiring basic data of a non-point source pollution discharge river reach to be measured;
extracting grey water footprint accounting parameters from the basic data;
and calculating the grey water footprint of the non-point source pollution discharge river reach to be detected by using a non-point source grey water footprint calculation formula based on the grey water footprint calculation parameters, wherein the non-point source grey water footprint calculation formula is obtained based on a non-point source pollution discharge load migration and conversion mechanism, a migration attenuation effect of non-point source pollutants entering the river along the river bank and in the river channel, and a non-point source pollution discharge load and control section water quality response relation.
2. The method for grey water footprint calculation for a non-point source blowdown river reach of claim 1, wherein the base data comprises: spatial data, pollution data, and hydrological data, wherein,
the spatial data comprise river channel position information and river reach control section positions;
the pollution data comprises the discharge capacity, the background concentration of the incoming water and the water quality standard of the control section;
the hydrologic data includes the flow rate of the river segment.
3. The method for calculating grey water footprint for a non-point source blowdown river reach of claim 2, wherein the grey water footprint accounting parameters comprise: background concentration of pollutants in water coming from the upstream of the reference section, water environment quality standard concentration of pollutants of the control section, comprehensive attenuation coefficient of pollutants, distance from the control section to the reference section and design average flow velocity of a river reach.
4. The method for calculating grey water footprint of a non-point source blowdown river reach of claim 1, wherein the non-point source grey water footprint accounting formula is as follows:
wherein, GWFnpsThe flow rate of the grey water footprint is shown, and M is the non-point source sewage discharge amount of the river reach; r is the accumulated attenuation coefficient of the pollutants along the way; csControlling the water environment quality standard concentration of the cross-section pollutants; mu is the average flow speed designed for the river reach; c0Background concentration of pollutants in the incoming water upstream of the reference section; k is the comprehensive attenuation coefficient of the pollutants; and x is the distance from the control section to the reference section.
5. The method for grey water footprint calculation of a non-point source blowdown river reach of claim 3, wherein the on-the-way cumulative attenuation coefficient of contaminants R is represented by the following formula:
wherein k is a comprehensive attenuation coefficient of the pollutants; x is the distance from the control section to the reference section; mu is the designed average flow velocity of the river reach.
6. The method for calculating grey water footprint of a non-point source blowdown river reach of claim 4, wherein the comprehensive attenuation coefficient k of pollutants is determined analytically or experimentally.
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| CN113361114A (en) * | 2021-06-11 | 2021-09-07 | 中国科学院精密测量科学与技术创新研究院 | Multi-scale non-point source pollutant river entry coefficient measuring and calculating method based on runoff path |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113361114A (en) * | 2021-06-11 | 2021-09-07 | 中国科学院精密测量科学与技术创新研究院 | Multi-scale non-point source pollutant river entry coefficient measuring and calculating method based on runoff path |
| CN113361114B (en) * | 2021-06-11 | 2022-05-17 | 中国科学院精密测量科学与技术创新研究院 | Multi-scale non-point source pollutant river entering coefficient measuring and calculating method based on runoff path |
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| NL2026697B1 (en) | 2021-11-09 |
| NL2026697A (en) | 2021-08-18 |
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