CN113240203B - Method for calculating pollution contribution rate of cross section of small river in multiple pollution sources - Google Patents
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Abstract
The invention discloses a method for calculating the pollution contribution rate of a cross section of a small river in a multi-pollution source, which comprises the following steps: step 1, determining the water quality parameters of river channel hydrology: determining hydrologic water quality parameters of a target river channel; step 2, generalizing river pollution sources: generalizing the river pollution source according to the hydrologic water quality parameters in the step 1; step 3, predicting the concentration of pollutants: predicting the concentration of the pollutants to the downstream control section under the condition that only a single pollution source is assumed according to the pollutant concentration prediction one-dimensional water quality model; step 4, analyzing the contribution rate of the pollution source: and analyzing the contribution rate of each pollution source to the downstream control section pollution. The calculation method is simple, convenient and effective, and is suitable for tracing the pollutants on the control section of the medium and small river channels.
Description
Technical Field
The invention belongs to the technical field of environmental engineering, and particularly relates to a method for calculating the contribution rate of cross section pollution of a small river channel in multiple pollution sources.
Background
Along with the rapid development of social economy, the river pollution problem is increasingly severe, the contradiction between the water environment pollution load and the river pollution receiving capacity is increasingly prominent, and the sustainable development of the river basin is severely restricted.
The medium and small river channel accommodates pollutants carried by various afflux points along the way, the point sources and the non-point sources are various, and pollution influence factors are numerous, so that the pollution contribution rate of the external source input of the medium and small river channel to a specific assessment section is quantitatively analyzed, the accurate grasp of the pollutant tracing of the river channel is facilitated, and the technical support is provided for making scientific pollutant reduction countermeasures.
The existing quantitative analysis and calculation method aiming at the contribution rate of a specific pollution source is complex, numerical simulation and the like are often needed, calculation difficulty and time cost are increased, and the research aiming at quantitative analysis of the contribution rate of the pollution source of a medium-sized and small river channel is blank.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problem to be solved by the invention is to provide a calculation method for the contribution rate of the cross section pollution of a small river channel in multiple pollution sources, which is used for determining the hydrologic water quality parameters of a target river channel, generalizing the pollution sources, predicting the concentration of pollutants under the condition that only a single pollution source is discharged, and finally analyzing the contribution rate of each pollution source to the downstream control cross section pollution. The calculation method is simple, convenient and effective, and is suitable for tracing the pollutants on the control section of the medium and small river channels.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a method for calculating the contribution rate of the section pollution of a small river in a multi-pollution source comprises the following steps:
step 1, determining the water quality parameters of river channel hydrology: determining hydrologic water quality parameters of a target river channel;
step 2, generalizing river pollution sources: generalizing the river pollution source according to the hydrologic water quality parameters in the step 1;
step 3, predicting the concentration of pollutants: predicting the concentration of the pollutants to the downstream control section under the condition that only a single pollution source is assumed according to the pollutant concentration prediction one-dimensional water quality model;
step 4, analyzing the contribution rate of the pollution source: and analyzing the contribution rate of each pollution source to the downstream control section pollution.
In order to optimize the technical scheme, the specific measures adopted further comprise:
step 1 above, determining the hydrological water quality parameters of the following target river channel:
river channel one-dimensional degradation coefficient k, river channel average width B, river channel average water depth H and river channel length L;
upstream section background concentration C 0 Initial flow q 0 ；
Distance L of ith pollution source from upstream section i Concentration C of ith pollution source i Flow q of ith pollution source i 。
Step 2 above is performed as follows:
the river tributaries are generalized into point sources;
the river surface source pollution is generalized to be a point source, and the point of the river flowing into the river takes the midpoint of the length of the river.
And 3, under the condition that only the ith pollution source is discharged, predicting the concentration from the ith pollution source to the downstream control section according to the one-dimensional water quality model.
The steps for predicting the pollutant concentration from the ith pollutant source to the downstream control section are as follows:
assuming that only the ith pollution source is discharged, the concentration of the pollutant from the upstream incoming water to the ith pollution source is:
wherein C is 0 For the background concentration of the upstream section, k is the pollutant degradation coefficient, L i Is the distance of the ith pollution source from the upstream section;
u is the average flow rate, q 0 B is the average width of the river channel, and H is the average water depth of the river channel;
the concentration of the contaminants from the ith source of contamination to the control section is:
wherein q is i Is the flow of the ith pollution source.
The pollutant degradation coefficient is constant.
In the step 4, the pollution contribution rate of the ith pollution source to the control section is calculated as follows:
pollution contribution rate of the ith pollution source to the control section:
wherein delta i The pollution contribution rate of the ith pollution source to the control section is obtained, and n is the number of the pollution sources.
The invention has the following beneficial effects:
the river entering pollution sources are generalized by determining the hydrologic and water quality parameters of the target river, the pollutant concentration from the river entering pollution sources to the control section is further calculated and predicted by a one-dimensional method, and finally the contribution rate of each pollution source to the pollution of the downstream control section is calculated and predicted.
The calculation method based on the one-dimensional water quality model is simple, convenient and effective, can be widely applied to water environment management, pollutant concentration prediction and water pollution control of the middle and small river channels, and provides technical support for pollutant tracing and scientific pollutant reduction countermeasures of the middle and small river channels. Has strong practicability and wide applicability.
Drawings
FIG. 1 is a schematic diagram of a method for calculating the pollution contribution rate of a small river section in a pollution source;
FIG. 2 is a schematic view showing the outline of the non-point source pollution of the present invention.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
Referring to fig. 1 and 2, the method for calculating the contribution rate of the cross section pollution of the small river in the multi-pollution source comprises the following steps:
step 1, determining the water quality parameters of river channel hydrology: determining hydrologic water quality parameters of a target river channel;
step 2, generalizing river pollution sources: generalizing the river pollution source according to the hydrologic water quality parameters in the step 1;
step 3, predicting the concentration of pollutants: predicting the concentration of the pollutants to the downstream control section under the condition that only a single pollution source is assumed according to the pollutant concentration prediction one-dimensional water quality model;
step 4, analyzing the contribution rate of the pollution source: and analyzing the contribution rate of each pollution source to the downstream control section pollution.
In an embodiment, in the step 1, the following hydrological water quality parameters of the target river are determined:
river channel one-dimensional degradation coefficient k, river channel average width B, river channel average water depth H and river channel length L;
upstream section background concentration C 0 Initial flow q 0 ；
Distance L of ith pollution source from upstream section i Concentration C of ith pollution source i Flow q of ith pollution source i 。
In the embodiment, step 2 is performed as follows:
the river tributaries are generalized into point sources;
the river surface source pollution is generalized to be a point source, and the point of the river flowing into the river takes the midpoint of the length of the river.
In the embodiment, in step 3, under the condition that only the ith pollution source is discharged, the concentration from the ith pollution source to the downstream control section is predicted according to the one-dimensional water quality model.
In an example, the prediction of the i-th pollution source to downstream control section pollutant concentration is as follows:
assuming that only the ith pollution source is discharged, the concentration of the pollutant from the upstream incoming water to the ith pollution source is:
wherein C is 0 For the background concentration of the upstream section, k is the pollutant degradation coefficient (assuming the pollutant degradation coefficient of the middle and small river is constant), L i Is the distance of the ith pollution source from the upstream section;
u is the average flow rate, q 0 B is the average width of the river channel, and H is the average water depth of the river channel;
the concentration of the contaminants from the ith source of contamination to the control section is:
wherein q is i Is the flow of the ith pollution source.
In the embodiment, in step 4, the pollution contribution rate of the ith pollution source to the control section is calculated as follows:
pollution contribution rate of the ith pollution source to the control section:
wherein delta i The pollution contribution rate of the ith pollution source to the control section is obtained, and n is the number of the pollution sources.
Example 1: taking a small and medium river channel in a certain area as an example, calculating the pollution contribution rate of the section of the small and medium river channel with multiple pollution sources, and the method comprises the following steps:
(1) On-site investigation river course hydrologic water quality parameter includes:
the river channel calculation area is 8km, the area has 2 point source pollution and 1 non-point source pollution, the average water depth of the river channel is 1.6m, the average river width is 10m, and the upstream incoming flow BOD 5 The local concentration is 3mg/L, and the initial flow of upstream incoming flow is 1m 3 S, the pollutant degradation coefficient is 0.8/d; the 1 st pollution source is a point source, and the flow rate of the pollution source is 0.5m 3 The concentration of the pollution source is 6mg/L, and the distance from the pollution source to the upstream section is 2km; the 2 nd pollution source is non-point source pollution, the flow of the pollution source is 1m 3 The concentration of a pollution source is 4mg/L, and the distance from the middle point of the surface source pollution to the upstream section is 5km; the 3 rd pollution source is point source pollution, and the flow of the pollution source is 0.8m 3 And/s, the concentration of the pollution source is 5mg/L, and the distance from the pollution source to the upstream section is 7km.
(2) And (3) pollutant concentration prediction:
the 1 st pollution source flow is 0.5m 3 And/s, the concentration of the pollution source is 6mg/L, the distance from the pollution source to the upstream section is 2km, and the concentration of the pollutant from the upstream incoming water to the 1 st pollution source is as follows:
concentration of contaminants from the 1 st source to the control section:
the 2 nd pollution source flow is 1m 3 And/s, the concentration of the pollution source is 4mg/L, the distance from the midpoint of the pollution source to the upstream section is 5km, and the concentration of the pollutant from the upstream incoming water to the 2 nd pollution source is as follows:
contaminant concentration from the 2 nd source to the control section:
the 3 rd pollution source flow is 0.8m 3 And/s, the concentration of the pollution source is 5mg/L, the distance from the pollution source to the upstream section is 7km, and the concentration of the pollutant from the upstream incoming water to the 3 rd pollution source is as follows:
contamination source 3 to control section contaminant concentration:
pollution contribution rate of the 1 st pollution source to the control section:
pollution contribution rate of the 2 nd pollution source to the control section:
pollution contribution rate of the 3 rd pollution source to the control section:
in summary, the river entering pollution sources are generalized by determining the hydrologic and water quality parameters of the target river, the pollutant concentration from the river entering pollution sources to the control section is further calculated and predicted by a one-dimensional method, and finally the contribution rate of each pollution source to the pollution of the downstream control section is calculated and predicted.
The calculation method provided by the invention is simple, convenient and effective, can be widely applied to water environment management, pollutant concentration prediction and water pollution control of the middle and small river channels, and provides technical support for pollutant tracing and scientific pollutant reduction countermeasures of the middle and small river channels. Has strong practicability and wide applicability.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (5)
1. A method for calculating the pollution contribution rate of a small river section in a multi-pollution source is characterized by comprising the following steps:
step 1, determining the water quality parameters of river channel hydrology: determining hydrologic water quality parameters of a target river channel;
step 2, generalizing river pollution sources: generalizing the river pollution source according to the hydrologic water quality parameters in the step 1;
step 3, predicting the concentration of pollutants: predicting the concentration of the pollutants to the downstream control section under the condition that only a single pollution source is assumed according to the pollutant concentration prediction one-dimensional water quality model;
step 4, analyzing the contribution rate of the pollution source: analyzing the contribution rate of each pollution source to the downstream control section pollution;
in the step 3, the prediction steps from the ith pollution source to the downstream control section pollutant concentration are as follows:
assuming that only the ith pollution source is discharged, the concentration of the pollutant from the upstream incoming water to the ith pollution source is:
wherein C is 0 For the background concentration of the upstream section, k is the pollutant degradation coefficient, L i Is the distance of the ith pollution source from the upstream section;
u is the average flow rate, q 0 B is the average width of the river channel, and H is the average water depth of the river channel;
the concentration of the contaminants from the ith source of contamination to the control section is:
wherein q is i The flow rate for the ith pollution source;
in the step 4, the pollution contribution rate of the ith pollution source to the control section is calculated as follows:
pollution contribution rate of the ith pollution source to the control section:
wherein delta i The pollution contribution rate of the ith pollution source to the control section is obtained, and n is the number of the pollution sources.
2. The method for calculating the contribution rate of cross section pollution of a small river in a multi-pollution source according to claim 1, wherein the following hydrological water quality parameters of the target river are determined in step 1:
river channel one-dimensional degradation coefficient k, river channel average width B, river channel average water depth H and river channel length L;
upstream section background concentration C 0 Initial flow q 0 ；
Distance L of ith pollution source from upstream section i Concentration C of ith pollution source i Stream of ith pollution sourceQuantity q i 。
3. The method for calculating the contribution rate of small river section pollution in multiple pollution sources according to claim 1, wherein the step 2 is characterized in that the following river pollution sources are generalized:
the river tributaries are generalized into point sources;
the river surface source pollution is generalized to be a point source, and the point of the river flowing into the river takes the midpoint of the length of the river.
4. The method for calculating the contribution rate of pollution of small river sections in multiple pollution sources according to claim 1, wherein in the step 3, the concentration from the ith pollution source to the downstream control section is predicted according to a one-dimensional water quality model under the condition that only the ith pollution source is discharged.
5. The method for calculating the contribution rate of small river section pollution in multiple pollution sources according to claim 1, wherein the pollutant degradation coefficient is constant.
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| CN117371325B (en) * | 2023-10-25 | 2024-06-07 | 中节能数字科技有限公司 | Method, equipment and medium for calculating contribution degree of pollutant discharged from port into river section |
| CN117314023B (en) * | 2023-11-29 | 2024-02-20 | 智瑞碳(天津)科技有限公司 | Atmospheric pollution data analysis method, system and computer storage medium |
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