CN115795258B - Method for quantitatively analyzing influence of water taking mode on concentration of pollutants in downstream of river - Google Patents
Method for quantitatively analyzing influence of water taking mode on concentration of pollutants in downstream of river Download PDFInfo
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- CN115795258B CN115795258B CN202211323458.1A CN202211323458A CN115795258B CN 115795258 B CN115795258 B CN 115795258B CN 202211323458 A CN202211323458 A CN 202211323458A CN 115795258 B CN115795258 B CN 115795258B
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- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a method for quantitatively analyzing the influence of a water taking mode on the concentration of pollutants in the downstream of a river. The method comprises the following steps: 1) Collecting data such as data of the flow of upstream water taking sections and downstream influence analysis sections in a month-by-month process for many years, and the distance between the sections; 2) Setting month-by-month water intake under different water intake conditions; 3) Determining the runoff of two sections in different water taking modes; 4) Calculating concentration values affecting analysis sections when pollutants migrate from the water taking sections to the analysis sections in different water taking modes; 5) And analyzing the influence of different water taking schemes on the concentration of the pollutants in the downstream river. The method quantitatively researches the influence degree of changing the water taking mode on the concentration of the pollutants at the downstream of the river, and is simple, practical and efficient compared with the prior art.
Description
Technical Field
The invention relates to a method for analyzing the influence of a water taking mode on the concentration of pollutants at the downstream of a river based on taking-reduction, belongs to the technical field of hydraulic engineering, and particularly relates to a method for quantitatively analyzing the influence of a water taking mode on the concentration of pollutants at the downstream of the river.
Background
The construction project causes the change of the water taking scale, and relates to the influence of the quantity of water functional areas and water taking and water returning on other water users and ecological environment, thereby causing the influence of the concentration of pollutants in the downstream of the river. The evaluation of the influence degree of water intake on the concentration of pollutants in the downstream of the river is the basis for developing the water resource demonstration and environmental influence evaluation of planning and construction projects. The model is generally established according to the physical process of the migration and transformation of pollutants, and the correct establishment of the water quality model depends on the correct cognition and quantitative expression of the migration and transformation process of various pollutants in the water body. However, the influence of hydrologic, hydraulic, physical, chemical, biological and climatic factors in the pollutant migration process is complex, so that quantitative analysis of the migration and transformation rules of various water quality variables and the mathematical description of the interrelationship among the influence factors are difficult. For example, the "Chen Gushan gate water outlet to water quality influence simulation research of water works in white sand is based on actual measurement data of water pollution event at water intake of water works in white sand in Wuhan in 2012 and related hydrologic data, and then the accuracy, applicability and convenience of the model are researched and analyzed by establishing three water quality models and performing numerical simulation, researching migration and transformation process and rules of pollutants discharged into rivers, and comparing actual measurement data of water pollution event in white sand. More measured data and parameters are needed, the analysis process is complex and the workload is huge.
Disclosure of Invention
In order to overcome the problems of the prior art, the object of the present invention is achieved as follows:
a method for quantitatively analyzing the influence of a water intake mode on the concentration of pollutants in a river downstream, comprising the following steps:
1) Collecting data: the upstream water taking section flow rate is measured by a multi-year month-by-month process data, the downstream influence analysis section corresponding flow rate is measured by a multi-year month-by-month process data, the distance between the two sections of the upstream water taking section and the downstream influence analysis section, the river channel ratio drop, the actually measured large section data of the sections and the water quality monitoring data of the two sections;
2) Setting month-by-month water intake under different water intake conditions;
3) Determining the runoff of two sections in different water taking modes: the outflow runoff of the upstream water taking section is obtained by subtracting the water taking amount from the water taking section flow before water taking; subtracting the water intake from the flow of the downstream impact analysis section before taking water for runoff of the downstream impact analysis section;
4) Under different water taking modes, pollutants migrate from a water taking section to a concentration value affecting an analysis section, and the specific formula is as follows: according to the water area sewage receiving capability calculation procedure (GB/T25173-2010), a one-dimensional model analysis of a river is selected to obtain the river sewage receiving capability calculation method:
wherein:to get waterUnder the condition of one condition, the pollutant concentration affecting the analysis section is transferred from the upstream water taking section to the downstream water taking section, and the water taking scheme I is an air cooling water taking scheme; />In order to transfer the pollutant concentration affecting the analysis section from the upstream water taking section to the downstream under the condition of the water taking scheme II, mg/L is adopted, and the water taking scheme II is a wet cooling water taking scheme; x is the longitudinal distance between two sections, m; />The average flow velocity of the river reach after water intake in the scheme I is m/s; />The average flow velocity of the river reach after water intake is the scheme II, m/s; c (C) Upper 0 Initial contaminant concentration for upstream water intake section, mg/L; k is the comprehensive attenuation coefficient of pollutants, s -1 ；
5) Analysis of the effect of different water intake schemes on downstream river pollutant concentration:
the effect of water intake scheme one change to water scheme two on downstream analysis section contaminant concentration is expressed as a concentration reduction rate as p:
wherein:
wherein:for analyzing the month average diameter flow of the section, m, of the downstream influence under the condition of the water taking scheme 3 The method comprises the steps of carrying out a first treatment on the surface of the Obtained from step 3);
for taking water scheme IIUnder the condition of downstream influence analysis of the month average diameter flow, m 3 The method comprises the steps of carrying out a first treatment on the surface of the Obtained from step 3);
in order to obtain the moon-average flow rate of the upstream water taking section under the condition of the water taking scheme one, m 3 The method comprises the steps of carrying out a first treatment on the surface of the Obtained from step 3);
for the month uniform leakage diameter flow of the upstream water taking section under the second condition of the water taking scheme, m 3 The method comprises the steps of carrying out a first treatment on the surface of the Obtained from step 3);
in order to transfer the pollutant concentration affecting the analysis section from the upstream water taking section to the downstream under the condition of the water taking scheme I, mg/L; obtained by calculation in step 4);
in order to transfer the pollutant concentration affecting the analysis section from the upstream water taking section to the downstream under the condition of the water taking scheme II, mg/L; obtained by calculation in step 4);
in order to obtain the concentration of the pollutants in the analysis section, mg/L, which affects the downstream of the condition one of the water taking scheme; is obtained from the water quality monitoring data in step 1).
In the derivation process of p in the equation, according to mass conservation, the following relationship exists between the total amount of the water intake section pollutants and the total amount of the downstream influence analysis section pollutants:
total downstream section contaminants = total intake section contaminants-interval contaminants abate + interval contaminants sink
The different water intake schemes have little influence on the inlet amount of the interval pollutants, and the main changes are the total amount of the discharged pollutants and the interval pollutant elimination amount. Thus, there is the following relationship:
Q interval of 、C Interval of The concentration of the pollutants is respectively equal to the inflow runoff and the average concentration of the pollutants from the section of the reservoir to the section of the pasture. In the project, the air cooling unit and the wet cooling unit are considered to have no influence on the interval afflux and the average pollutant concentration.
The formula conversion can be obtained:
order theA calculation formula for p is obtained.
Further, the method for calculating the average flow velocity of the river after water intake in the scheme I comprises the following steps: calculating the upstream water intake section flow velocity v after water intake in scheme I Upper 1 And downstream influence analysis section flow velocity v after water intake Lower 1 The method comprises the steps of carrying out a first treatment on the surface of the Calculation of v Upper 1 And v Lower 1 Average value of (1) obtaining average flow velocity of river reach after water intakeThe method for calculating the average flow velocity of the river reach after water intake in the scheme II comprises the following steps: calculating the upstream water intake section flow velocity v after water intake of scheme II Upper 2 And downstream influence analysis section flow velocity v after water intake Lower 2 The method comprises the steps of carrying out a first treatment on the surface of the Calculation of v Upper 2 And v Lower 2 Average value of (2)Average flow rate of river reach after water intake in scheme II>
Scheme one upstream water intake section flow velocity v after water intake Upper 1 The calculation method of (1) is as follows:
scheme one analysis of downstream influence on section flow velocity v after Water intake Lower 1 The calculation method of (1) is as follows:
scheme II upstream water intake section flow velocity v Upper 2 The calculation method of (1) is as follows:
scheme II of downstream influence analysis section flow velocity v after water intake Lower 1 The calculation method of (1) is as follows:
wherein: a is that Upper part For upstream water intake cross-sectional area, m 2 ；A Lower part(s) For downstream influence analysis of cross-sectional area, m 2 The method comprises the steps of carrying out a first treatment on the surface of the t is 24-60 and v is the number of days in the month Upper 1 、v Lower 1 、v Upper 2 、v Lower 2 Are all m/s.
Further, the contaminant is a representative contaminant determined from water quality monitoring data.
The invention has the advantages and beneficial effects that: (1) Compared with the traditional method, the data demand and the workload are reduced: the problems that interval catchment and pollutant input must be considered in general calculation are eliminated by utilizing mass conservation and formula conversion, so that the data requirements and the analysis workload are greatly reduced; (2) efficiency improvement: the reduction of the workload means that the efficiency is greatly improved by the method; (3) improved computational reliability: in the general method, the data demand is large, the error sources are more, and the reliability is not high; meanwhile, the problem of reducing the pollutant in the influence region such as the difference of hydrologic conditions among different schemes is solved by adopting a mode of simultaneous solving of different schemes. (4) The method is suitable for multi-scheme scene analysis, and has good adaptability: in the general method, the demand of measured data is more, and the universality of the data is poorer because the characteristic difference of river areas is obvious, so that the data volume of the method is greatly reduced.
Drawings
The invention is further described below with reference to the drawings and examples.
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a graph of an analysis of water intake impact range according to an embodiment of the present invention.
Detailed Description
Embodiment one:
using long series of runoff data, three scenario conditions: the current actual situation is the water consumption of the user under the current actual situation; the current situation design scenario calculates the user design water consumption for reservoir regulation; the planning scenario is to predict 2030 year water usage.
Step one, data collection: the upstream water taking section flow is month-by-month process data (the following flow data is taken as a long series data average value) for many years (1956-2020), and the downstream influence analysis section flow is corresponding to the flow is month-by-month process data (the following flow data is taken as a long series data average value). The month average flow data Q of the upstream water taking section and the downstream influence analysis section before water taking are respectively collected Upper 0 And Q Lower 0 The method comprises the steps of carrying out a first treatment on the surface of the Respectively collecting pollutant concentration data C of upstream water taking section and downstream influence analysis section before water taking Upper 0 And C Lower 0 . The selected pollutants can be: dissolved oxygen, permanganate, COD, BOD5, ammonia nitrogen, total phosphorus in the reservoir, total nitrogen, fluoride, arsenic, cadmium (hexavalent), volatile phenol. The example is where the contaminant is a permanganate.
And collecting the distance between the upstream water taking section and the downstream impact analysis section, the river channel ratio drop, the actually measured large section data of the sections and the water quality monitoring data of the two sections. As shown in fig. 2, in this embodiment, the pasture section is a downstream analysis section, the reservoir section is an upstream water intake section, the pasture hydrologic station is about 60km from the reservoir dam site, the river channel ratio is reduced by about 0.0015, and the pollutant comprehensive attenuation coefficient K of the permanganate index is determined by referring to the "eastern Liao river pollutant comprehensive attenuation coefficient research", and specifically shown in table 2.
The flow before water intake and typical pollutant concentration data are the same in three situations, and the specific data are shown in the following table 1:
table 1 two section annual flow data
| Month of month | Q Upper 0 Ten thousand meters 3 | Q Lower 0 Ten thousand meters 3 | C Upper 0 /mg/L | C Lower 0 /mg/L |
| 1 | 370 | 270 | 6.4 | 6.4 |
| 2 | 229 | 133 | 4.6 | 6.4 |
| 3 | 374 | 205 | 2.7 | / |
| 4 | 9179 | 14370 | 3.7 | / |
| 5 | 10647 | 13065 | 5.7 | 5.4 |
| 6 | 9724 | 11960 | 7.8 | 7.2 |
| 7 | 13977 | 15303 | 7.8 | 6.5 |
| 8 | 11403 | 12830 | 5.9 | 5.7 |
| 9 | 8020 | 9664 | 3.3 | 7.5 |
| 10 | 5419 | 6477 | 6.5 | 6.9 |
| 11 | 1922 | 2231 | 7 | / |
| 12 | 734 | 814 | 6.5 | 6.1 |
Collecting distance x between two sections of upstream water taking section and downstream influence analysis section, comprehensive attenuation coefficient K of river pollutant between two sections and actually measured section area A of two sections Upper part 、A Lower part(s) The ratio of the two sections is reduced by i; see in particular table 2:
table 2 fixed data for two sections
Secondly, setting the month-by-month water intake under different water intake conditions:
the scheme one is an air cooling water taking scheme:
2 600MW air cooling units, water intake scale Q Taking out See table 3:
TABLE 3 air cooled water intake Scale Q Taking out Ten thousand meters 3
| Month of month | Current actual scenario | Current situation design scenario | Planning scenarios |
| 1 | 35 | 163 | 169 |
| 2 | -61 | 61 | 68 |
| 3 | 66 | 204 | 210 |
| 4 | 1615 | 4523 | 4724 |
| 5 | 364 | 114 | 300 |
| 6 | 427 | -142 | -40 |
| 7 | 189 | -1272 | -1201 |
| 8 | 251 | -826 | -664 |
| 9 | 559 | 113 | 218 |
| 10 | 621 | 1176 | 1240 |
| 11 | 498 | 1061 | 1085 |
| 12 | 226 | 444 | 451 |
The second scheme is a wet cooling water taking scheme:
2 600MW wet cooling units, water intake scale Q Taking out See table 4:
TABLE 4 Wet cold water intake Q Taking out Ten thousand meters 3
Then the mass conservation is utilized, and the flow data Q of the section of the upstream water reservoir and the section of the downstream pastoral farm after water taking is obtained by subtracting the water taking scale from the flow before water taking Upper 1 And Q Lower 1 。
Thirdly, determining the runoff of two sections in different water taking modes: the outflow runoff of the upstream water taking section is obtained by subtracting the water taking amount from the water taking section flow before water taking; subtracting the water intake from the flow of the downstream impact analysis section before taking water for runoff of the downstream impact analysis section;
and fourthly, under different water taking modes, the pollutants are transported from the water taking section to a concentration value affecting the analysis section, and the specific formula is as follows:
wherein:for taking water under the condition of taking water from upstream water sectionThe pollutant concentration of the analysis section is influenced by the movement to the downstream, mg/L is reached, and the water taking scheme I is an air cooling water taking scheme; />In order to transfer the pollutant concentration affecting the analysis section from the upstream water taking section to the downstream under the condition of the water taking scheme II, mg/L is adopted, and the water taking scheme II is a wet cooling water taking scheme; x is the longitudinal distance between two sections, m; />The average flow velocity of the river reach after water intake in the scheme I is m/s; />The average flow velocity of the river reach after water intake is the scheme II, m/s; c (C) Upper 0 Initial contaminant concentration for upstream water intake section, mg/L; k is the comprehensive attenuation coefficient of pollutants, s -1 ；
The method for calculating the average flow velocity of the river after water intake in the scheme I comprises the following steps: calculating the upstream water intake section flow velocity v after water intake in scheme I Upper 1 And downstream influence analysis section flow velocity v after water intake Lower 1 The method comprises the steps of carrying out a first treatment on the surface of the Calculation of v Upper 1 And v Lower 1 Average value of (1) obtaining average flow velocity of river reach after water intake
The method for calculating the average flow velocity of the river reach after water intake in the scheme II comprises the following steps: calculating the upstream water intake section flow velocity v after water intake of scheme II Upper 2 And downstream influence analysis section flow velocity v after water intake Lower 2 The method comprises the steps of carrying out a first treatment on the surface of the Calculation of v Upper 2 And v Lower 2 Average flow velocity of river reach after water intake of scheme II
Scheme one upstream water intake section flow velocity v after water intake Upper 1 The calculation method of (1) is as follows:
scheme one analysis of downstream influence on section flow velocity v after Water intake Lower 1 The calculation method of (1) is as follows:
scheme II upstream water intake section flow velocity v Upper 2 The calculation method of (1) is as follows:
scheme II of downstream influence analysis section flow velocity v after water intake Lower 1 The calculation method of (1) is as follows:
wherein: a is that Upper part For upstream water intake cross-sectional area, m 2 ；A Lower part(s) For downstream influence analysis of cross-sectional area, m 2 The method comprises the steps of carrying out a first treatment on the surface of the t is 24-60 and v is the number of days in the month Upper 1 、v Lower 1 、v Upper 2 、v Lower 2 Are all m/s. The unit of flow data should be converted into m and the unit of speed should be m/s at the time of calculation.
Fifth, analysis of influence of different water intake schemes on concentration of pollutants in downstream river channels:
the effect of water intake scheme one (air cooling) modification water scheme two (wet cooling) on downstream analysis section contaminant concentration is expressed as a concentration reduction rate as p:
wherein:
wherein:for analyzing the month average diameter flow of the section, m, of the downstream influence under the condition of the water taking scheme 3 The method comprises the steps of carrying out a first treatment on the surface of the Obtained from step 3);
for analyzing the month average diameter flow of the section for downstream influence under the second condition of the water taking scheme, m 3 The method comprises the steps of carrying out a first treatment on the surface of the Obtained from step 3);
in order to obtain the moon-average flow rate of the upstream water taking section under the condition of the water taking scheme one, m 3 The method comprises the steps of carrying out a first treatment on the surface of the Obtained from step 3);
for the month uniform leakage diameter flow of the upstream water taking section under the second condition of the water taking scheme, m 3 The method comprises the steps of carrying out a first treatment on the surface of the Obtained from step 3);
in order to transfer the pollutant concentration affecting the analysis section from the upstream water taking section to the downstream under the condition of the water taking scheme I, mg/L; obtained by calculation in step 4);
in order to transfer the pollutant concentration affecting the analysis section from the upstream water taking section to the downstream under the condition of the water taking scheme II, mg/L; obtained by calculation in step 4);
in order to obtain the concentration of the pollutants in the analysis section, mg/L, which affects the downstream of the condition one of the water taking scheme; is obtained from the water quality monitoring data in step 1).
The calculation results are shown in tables 5 to 7 below:
TABLE 5 actual scenario influence of Water intake air Cooling to humidity Cooling on downstream analysis section pollutant concentration (p,%)
| Month of month | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| p/％ | -2.29 | -1.59 | / | / | -1.37 | -0.88 | -1.58 | -0.75 | -1.26 | -2.41 | / | -5.20 |
Table 6 design scenario influence of Water-air Cooling to humidity Cooling on downstream analysis section pollutant concentration (p,%)
| Month of month | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| p/％ | -1.39 | -3.27 | / | / | -3.03 | -1.66 | -1.48 | -1.37 | -1.31 | -1.82 | / | -1.34 |
Table 7 Programming scenario influence of Water-air Cooling to humidity Change Cooling on downstream analysis section pollutant concentration (p,%)
| Month of month | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| p/％ | -1.42 | -4.83 | / | / | -2.48 | -2.24 | -1.45 | -1.11 | -1.68 | -2.89 | / | -1.48 |
The calculation result shows that under the current situation actual situation, current situation design and planning situations, the concentration of pollutants on the pasture section is increased due to the change of air cooling and wet cooling. Wherein, the concentration increase rate of the pasture section pollutants caused under the actual situation is between 0.75% and 5.20%, and the maximum increase rate is 12 months; the concentration increase rate of the pasture section pollutants caused under the current situation design scene is between 1.31% and 3.27%, and the maximum increase rate is 2 months; the concentration increase rate of the pasture section pollutants caused under the planning scene is between 1.11% and 4.83%, and the maximum increase rate is 2 months. In conclusion, three-phase engineering water intake has little influence on the concentration of downstream river pollutants.
Finally, it should be noted that the above only illustrates the technical solution of the present invention and is not limiting, and although the present invention has been described in detail with reference to the preferred arrangement, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.
Claims (3)
1. A method for quantitatively analyzing the effect of changing the water intake mode on the concentration of pollutants in a river downstream, comprising the following steps:
1) Collecting data: the upstream water taking section flow rate is measured by a multi-year month-by-month process data, the downstream influence analysis section corresponding flow rate is measured by a multi-year month-by-month process data, the distance between the two sections of the upstream water taking section and the downstream influence analysis section, the river channel ratio drop, the actually measured large section data of the sections and the water quality monitoring data of the two sections;
2) Setting month-by-month water intake under different water intake conditions;
3) Determining the runoff of two sections in different water taking modes: the outflow runoff of the upstream water taking section is obtained by subtracting the water taking amount from the water taking section flow before water taking; subtracting the water intake from the flow of the downstream impact analysis section before taking water for runoff of the downstream impact analysis section;
4) Under different water taking modes, pollutants migrate from a water taking section to a concentration value affecting an analysis section, and the specific formula is as follows:
wherein:in order to transfer the pollutant concentration affecting the analysis section from the upstream water taking section to the downstream under the condition of the water taking scheme I, mg/L is adopted, and the water taking scheme I is an air cooling water taking scheme; />In order to transfer the pollutant concentration affecting the analysis section from the upstream water taking section to the downstream under the condition of the water taking scheme II, mg/L is adopted, and the water taking scheme II is a wet cooling water taking scheme; x is the longitudinal distance between two sections, m; />The average flow velocity of the river reach after water intake in the scheme I is m/s; />The average flow velocity of the river reach after water intake is the scheme II, m/s; c (C) Upper 0 Initial contaminant concentration for upstream water intake section, mg/L; k is the comprehensive attenuation coefficient of pollutants, s -1 ；
5) Analysis of the effect of different water intake schemes on downstream river pollutant concentration:
the effect of water intake scheme one change to water scheme two on downstream analysis section contaminant concentration is expressed as a concentration reduction rate as p:
wherein,
wherein:to analyze the cross-sectional runoff quantity, m, of the downstream influence under the condition of a water taking scheme 3 The method comprises the steps of carrying out a first treatment on the surface of the Obtained from step 3);
to analyze the cross-sectional runoff quantity, m, of the downstream influence under the second condition of the water taking scheme 3 The method comprises the steps of carrying out a first treatment on the surface of the Obtained from step 3); />For the downstream flow rate of the upstream water taking section under the condition of the water taking scheme one, m 3 The method comprises the steps of carrying out a first treatment on the surface of the Obtained from step 3); />For the downstream leakage flow of the upstream water taking section under the second condition of the water taking scheme, m 3 The method comprises the steps of carrying out a first treatment on the surface of the Obtained from step 3); />In order to transfer the pollutant concentration affecting the analysis section from the upstream water taking section to the downstream under the condition of the water taking scheme I, mg/L; obtained by calculation in step 4);
in order to transfer the pollutant concentration affecting the analysis section from the upstream water taking section to the downstream under the condition of the water taking scheme II, mg/L; obtained by calculation in step 4);
in order to obtain the concentration of the pollutants in the analysis section, mg/L, which affects the downstream of the condition one of the water taking scheme; is obtained from the water quality monitoring data in step 1).
2. The method for quantitatively analyzing the influence of a water intake mode on the concentration of pollutants in a river downstream according to claim 1, wherein the calculation method of the average flow rate of the river after water intake according to scheme one is as follows: calculating the upstream water intake section flow velocity v after water intake in scheme I Upper 1 And downstream influence analysis section flow velocity v after water intake Lower 1 The method comprises the steps of carrying out a first treatment on the surface of the Calculation of v Upper 1 And v Lower 1 Average value of (1) obtained after scheme-one water intakeThe method for calculating the average flow velocity of the river reach after water intake in the scheme II comprises the following steps: calculating the upstream water intake section flow velocity v after water intake of scheme II Upper 2 And downstream influence analysis section flow velocity v after water intake Lower 2 The method comprises the steps of carrying out a first treatment on the surface of the Calculation of v Upper 2 And v Lower 2 Average value of (2) obtained average flow rate of river reach after water intake of scheme II +.>
Scheme one upstream water intake section flow velocity v after water intake Upper 1 The calculation method of (1) is as follows:
scheme one analysis of downstream influence on section flow velocity v after Water intake Lower 1 The calculation method of (1) is as follows:
scheme II upstream water intake section flow velocity v Upper 2 The calculation method of (1) is as follows:
scheme II of downstream influence analysis section flow velocity v after water intake Lower 2 The calculation method of (1) is as follows:
wherein: a is that Upper part For upstream water taking breakArea of surface, m 2 ；A Lower part(s) For downstream influence analysis of cross-sectional area, m 2 The method comprises the steps of carrying out a first treatment on the surface of the t is 24-60 and v is the number of days in the month Upper 1 、v Lower 1 、v Upper 2 、v Lower 2 Are all m/s.
3. The method of quantitatively analyzing the effect of changing the manner of water intake on the concentration of contaminants downstream of a river of claim 1, wherein the contaminants are representative contaminants determined from water quality monitoring data.
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