CN109408972A - The method that computer programing based on Delft3D model calculates environmental capacity of water - Google Patents
The method that computer programing based on Delft3D model calculates environmental capacity of water Download PDFInfo
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Abstract
The method that the computer programing that the present invention relates to a kind of based on Delft3D model calculates environmental capacity of water, effective solution of the present invention early stage can only estimate roughly environmental capacity of water, time and spatial accuracy are poor simultaneously, the larger problem of experience dependence；The technical solution of solution includes: to choose certain river to be research range and target section Classification of water Qualities is arranged；Setting model boundary condition includes upstream incoming flow and tributary boundary condition on the way；The input of Delft3D model system is used to export to obtain pollutant concentration value when target section water quality reaches requirement with upper boundary conditions parameter；The calculation of water environmental capacity that related data carries out pollutant is extracted from model, since Delft3D model can utilize specific discrete hydrology-water quality data, be computed output the time be accurate to the second, space is accurate to Hydrodynamic field and the water quality field of rice, it realizes that automation calculates by preparing a computer program, the calculation of water environmental capacity of any water body any time period finally can be achieved.
Description
Technical field
The present invention relates to the environmental managements such as pollution emission reduction and pollutant emission factor fields, and in particular to one kind is based on
The method that the computer programing of Delft3D model calculates environmental capacity of water.
Background technique
Environmental carrying capacity is one of Issues of Basic Theory of environmental science, is one of important actual application problem of environmental management
Environmental capacity of water is the important component of environmental carrying capacity, is one of the core content of capacity total amount technical system.With China
Water environment management system realizes quality in watershed target tube from concentration control, transformation of the target overall control to Capacity-Overall Control
Reason receives dirty red line management with Water Functional Zone limitation, and environmental capacity of water is theoretical and the importance of Research on Calculation more highlights.In
The initial calculation of water environmental capacity method of state first is that directly establish its calculation formula from definition, this meter can be claimed
Calculation method is equation；With going deep into for research, and Water Environment Mathematical Model formula is combined, i.e., is defined based on environmental capacity of water
And Water Environment Mathematical Model, the calculation of water environmental capacity formula under certain condition is derived, hydrodynamic model and water quality model are based on
Required parameters in calculation of water environmental capacity formula are calculated, and then substitutes into formula and calculates environmental capacity of water.By what is derived
Calculation of water environmental capacity formula is also referred to as environmental capacity of water model, and (careful wait has used " environmental capacity of water mathematical modulo earliest
Type ", the concept of " environmental capacity of water model "), therefore equation also known as environmental capacity of water modelling.
Very much, but its citation form is equal for the computation model (calculation formula) of environmental capacity of water are as follows: environmental capacity of water=dilution
Capacity+from net capacity+migration capacity.With gradually deep, the calculation of water environmental capacity formula gradual perfection of research, and according to not
With pollutant, different water bodys and establish different calculation formula.Equation may be considered most basic in all kinds of methods
Method, the calculating of other kinds method is also based on calculation of water environmental capacity formula, due to the general side of change of formula under different operating conditions
There are difference for method, and as illustrated, equation has different expression ways, this also can make the calculated result of environmental capacity of water
It is different；Especially early stage, due to environmental capacity of water definition, i.e. difference itself is larger, then calculated result certainly exists difference,
Therefore early stage can only estimate roughly environmental capacity of water, while time and spatial accuracy are poor, experience dependence is larger.
Recently as the development of numerical model and computer technology, Hydrodynamic field, the simulation of water quality field and prediction model
It makes great progress, by taking Delft3D model as an example, inputs data (flow, water in particular point (upstream, downstream, tributary etc.)
Position, water quality etc.), model can simulate the Hydrodynamic field of entire water body and water quality field by these discrete data, when
Between resolution ratio can be as accurate as the second, spatial resolution can be as accurate as 1m,
Then it is calculated by the realization automation for preparing a computer program, finally realizes the water environment of any water body any time
Calculation of capacity, therefore, the present invention provide a kind of side of computer programing calculating environmental capacity of water based on Delft3D model
Method.
Summary of the invention
For above situation, for the defect for overcoming the prior art, the present invention provides a kind of calculating based on Delft3D model
The method of machine sequencing calculating environmental capacity of water.Effective solution early stage can only estimate roughly environmental capacity of water
It calculates, while time and spatial accuracy are poor, the larger problem of experience dependence.
The method that computer programing based on Delft3D model calculates environmental capacity of water, which is characterized in that calculate step
It is as follows:
Step 1: choosing certain river is research range, and by taking the environmental carrying capacity of river X calculates as an example, the river target side
Face function water quality is F class water quality, when calculating the section and meet F class water standard, the X environmental capacity of water in the river；
Step 2: carrying out the drafting of orthonormal curvilinear grid to the river according to the research range of model, obtaining one and contain
Grid number is the grid of A, and the mean depth in the river is set as N；
Step 3: setting model boundary condition includes upstream incoming flow boundary condition, on the way tributary boundary condition；
Step 4: a point of release, flow, the concentration of emission of point of release is additionally arranged in the upstream of the river research range
Be respectively set to M, L, use Delft3D model system by input upstream incoming flow boundary condition, on the way tributary boundary condition with
And the flow M and concentration of emission L of point of release X, output obtain the concentration of target assessment section X, point of release flow M are determined, no
Disconnected adjustment concentration of emission L numerical value, so that the X concentration in target section part reaches exactly to F class standard value；
Step 6: the calculating that related data carries out the environmental capacity of water of X is extracted from model after model calculates, it is public
Formula is as follows:
Pass through calculation formula:
ABS is the symbol of an absolute value in formula, and expression takes absolute value to subsequent calculated value；Assuming that being provided with n+1
A data, time are denoted as respectively: t0,t1…tn, unit: min, corresponding flow are respectively as follows: q0,q1…qn, unit: m3/ s is right
The concentration answered is respectively as follows: c0,c1…cn, unit: kg/m3；
Wherein, first data is the data of model time started, and nth data is the data of model end time.Meter
The value calculated, divided by 1000, obtains the X environmental carrying capacity that unit is t/d divided by simulated time number of days.
Preferably, boundary condition set in the step 3 is the flow of pollutant X and the prison of pollutant X concentration
Measured value.
Preferably, the related data extracted from model in the step 6 refers to: t0,t1…tn, unit: min, often
The flow and concentration of pollutant X in a period.
(1) since Delft3D model can be using specific discrete hydrology-water quality data, being computed the output time is accurate to
Second, space is accurate to Hydrodynamic field and the water quality field of rice, realizes that automation calculates by preparing a computer program, final to can be achieved
The calculation of water environmental capacity of any water body any time period；
(2) present invention can fast and accurately calculate the environmental capacity of water of water body of interest, be the disposal of pollutants of water body periphery
Formulation with water environment relevant policies provides scientific basis.
Detailed description of the invention
Fig. 1 is the river model grid schematic diagram；
Fig. 2 is the river topography schematic diagram；
Fig. 3 is model modeling flow chart；
Fig. 4 is the model boundary distribution map；
Fig. 5 is downstream targets monitoring point and the modal position relation schematic diagram.
Specific embodiment
For the present invention aforementioned and other technology contents, feature and effect, in following cooperation with reference to figures 1 through Fig. 5 pairs
In the detailed description of embodiment, can clearly it present.The structure content being previously mentioned in following embodiment is attached with specification
Figure is reference.
Each exemplary embodiment of the invention is described below with reference to accompanying drawings.
Embodiment 1, the method that the computer programing based on Delft3D model calculates environmental capacity of water, which is characterized in that
Steps are as follows for calculating:
Step 1: choosing certain river is research range, by taking the environmental carrying capacity of the river ammonia nitrogen calculates as an example, it is assumed that the river
Target end face function water matter is V class water quality, when calculating the section and meet V class water standard, the ammonia nitrogen water environment in the river
Capacity, the V class water quality are the standard in " water environment quality standard " GB3838-2002, " surface water environment quality mark
It is quasi- " surface water quality is classified as I class, II class, Group III, IV class, V class in GB3838-2002；
Step 2: carrying out the drafting of orthonormal curvilinear grid to the river according to the research range of model, obtaining one and contain
The grid that grid number is 5971, the mean depth in the river are set as 1 meter；
Step 3: setting model boundary condition includes upstream incoming flow boundary condition, on the way tributary boundary condition, the perimeter strip
Part be different upstream incoming flows and on the way in tributary flow condition and condition of water quality monitor value；
Step 4: a point of release, flow, the concentration of emission of point of release is additionally arranged in the upstream of the river research range
Be respectively set to M, L, use Delft3D model system by input upstream incoming flow boundary condition, on the way tributary boundary condition with
And the flow M and concentration of emission L of point of release ammonia nitrogen, output obtains the concentration of target assessment section ammonia nitrogen, and point of release flow M is true
It is set to 5m3/ s constantly adjusts concentration of emission L numerical value, so that the ammonia nitrogen concentration in target section part reaches exactly to V class standard value；
Step 5: the calculating that related data carries out the environmental capacity of water of ammonia nitrogen is extracted from model after model calculates,
Pass through calculation formula:
ABS is the symbol of an absolute value in formula, and expression takes absolute value to subsequent calculated value, the flow of ammonia nitrogen and dense
The product adduction of degree is exactly the environmental carrying capacity of the section ammonia nitrogen；
Assuming that being provided with n+1 data, the time is denoted as respectively: t0,t1…tn, unit: min, corresponding flow are respectively as follows:
q0,q1…qn, unit: m3/ s, corresponding concentration are respectively as follows: c0,c1…cn, unit: kg/m3；
Wherein, first data is the data of model time started, and nth data is the data of model end time.Meter
The value calculated, divided by 1000, obtains the ammonia nitrogen environmental carrying capacity that unit is t/d divided by simulated time number of days；
The related data extracted from model in step 5 refers to: t0,t1…tn, unit: min, it is dirty in each period
The flow and concentration of object ammonia nitrogen are contaminated, is then calculated by formula by t0,t1…tn, unit: min, the ammonia nitrogen ring in all periods
Border capacity sums up when show that target section meets V class water standard, the environmental capacity of water of the section ammonia nitrogen.
S=(2 × 0.002+6 × 0.3 × 0.0015+5 × 0.0017) × 1440 × 60/1000=1.3
In formula 2 × 0.002 be step 3 middle and upper reaches inlet flow rate and water quality product；6 × 0.3 × 0.0015 is six
The product of tributary flow and water quality on the way；5 × 0.0017 for the flow of point of release and when target section ammonia nitrogen concentration value reaches V class
The product of the concentration of emission of point of release ammonia nitrogen when standard.
Since Delft3D model can be using specific discrete hydrology-water quality data, being computed the output time is accurate to the second,
Space is accurate to Hydrodynamic field and the water quality field of rice, realizes that automation calculates by preparing a computer program, final to can be achieved to appoint
The calculation of water environmental capacity of meaning water body any time period.The water environment that the present invention can fast and accurately calculate water body of interest is held
Amount, provides scientific basis for the disposal of pollutants of water body periphery and the formulation of water environment relevant policies.
Embodiment described above is not intended to limit the scope of the present invention, before not departing from design concept of the present invention
It puts, the various changes and improvements that technical staff described in this field makes technical solution of the present invention should all be included in the present invention
Claims determine protection scope in.
Claims (3)
1. the method that the computer programing based on Delft3D model calculates environmental capacity of water, which is characterized in that calculate step such as
Under:
Step 1: choosing certain river is research range, and by taking the environmental carrying capacity of river X calculates as an example, the river target end face function
Can water quality be F class water quality, when calculating the section and meet F class water standard, the X environmental capacity of water in the river；
Step 2: carrying out the drafting of orthonormal curvilinear grid to the river according to the research range of model, obtaining one and contain grid
Number is the grid of A, and the mean depth in the river is set as N；
Step 3: setting model boundary condition includes upstream incoming flow boundary condition, on the way tributary boundary condition；
Step 4: a point of release, the flow of point of release, concentration of emission difference is additionally arranged in the upstream of the river research range
It is set as M, L, using Delft3D model system by inputting upstream incoming flow boundary condition, on the way tributary boundary condition and releasing
The flow M and concentration of emission L of point X are put, output obtains the concentration of target assessment section X, and point of release flow M is determined, constantly adjusts
Whole concentration of emission L numerical value, so that the X concentration in target section part reaches exactly to F class standard value；
Step 5: extracting the calculating that related data carries out the environmental capacity of water of X from model after model calculates, passing through meter
Calculate formula:
ABS is the symbol of an absolute value in formula, and expression takes absolute value to subsequent calculated value；
Assuming that being provided with n+1 data, the time is denoted as respectively: t0,t1…tn, unit: min, corresponding flow are respectively as follows: q0,
q1…qn, unit: m3/ s, corresponding concentration are respectively as follows: c0,c1…cn, unit: kg/m3；
Wherein, first data is the data of model time started, and nth data is the data of model end time.It calculates
The value come, divided by 1000, obtains the X environmental carrying capacity that unit is t/d divided by simulated time number of days.
2. the method that the computer programing according to claim 1 based on Delft3D model calculates environmental capacity of water,
It is characterized in that, set boundary condition is the flow of pollutant X and the monitor value of pollutant X concentration in the step 3.
3. special according to the method that the computer programing described in claim 1 based on Delft3D model calculates environmental capacity of water
Sign is that the related data extracted from model in the step 6 refers to: t0,t1…tn, unit: min, each period
The flow and concentration of interior pollutant X.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024051131A1 (en) * | 2022-09-09 | 2024-03-14 | 河北先河环保科技股份有限公司 | Water environmental capacity calculation method and apparatus, electronic device, and storage medium |
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| WO2024051131A1 (en) * | 2022-09-09 | 2024-03-14 | 河北先河环保科技股份有限公司 | Water environmental capacity calculation method and apparatus, electronic device, and storage medium |
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