CN108764535A - The forecasting procedure that a kind of ship waste under windy conditions influences bathing beach environment - Google Patents
The forecasting procedure that a kind of ship waste under windy conditions influences bathing beach environment Download PDFInfo
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- CN108764535A CN108764535A CN201810433466.9A CN201810433466A CN108764535A CN 108764535 A CN108764535 A CN 108764535A CN 201810433466 A CN201810433466 A CN 201810433466A CN 108764535 A CN108764535 A CN 108764535A
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Abstract
The present invention provides the forecasting procedures that the ship waste under a kind of windy conditions influences bathing beach environment, based on a set of three-dimensional wave-stream-silt coupling model for incorporating SWAN waves model, FVCOM flow field models and FVCOM sediment models, the flow field needed for pollutant diffusion model and wave field information is calculated.Wherein three-dimensional wave-stream-silt coupling model forces the wind field data being calculated using WRF Atmospheric models as surface, and using the Tidal Information that TPXO tidal models calculate as the drive condition of model boundary.Pollutant spreads mould will be based on Lagrangian example tracer technique, and incorporates the pollutant diffusion submodel of the different pollutant types of a variety of correspondences, and influence of the wind to variety classes pollutant transport is fully considered in greasy dirt diffusion model.
Description
Technical field
The present invention relates to bathing beach environmental forecasting field, the ship waste under especially a kind of windy conditions is to beach
The forecasting procedure that outdoor bathing place environment influences.
Background technology
The polluter for influencing bathing beach environment includes floating material, excrement colibacillus group and petroleum-type etc., ship waste
Discharge be also these polluters one of main source.Ship waste can follow ocean current movement very after being discharged hull
Remote distance, and on by way of the environment of bathing beach cause serious influence.Numerical model means have been widely used in
In the diffusion simulations of marine oil overflow and pollutant, but most of numerical models do not distinguish pollution when simulating pollution object moves
The type of object, but pollutant is broadly handled as a substance.And it is apparent that different types of pollutant is being transported
There is different property during dynamic, as excrement colibacillus group obviously has different forms of motion from floating material pollutant.In this way
All pollutants are handled as a substance it is clearly unreasonable, especially under windy conditions, float species meeting
The excrement colibacillus group for being directly driven by wind-stress, and being suspended in water body is then more affected by wind current and wind-induced wave
Effect.It is therefore desirable to classify to pollutant in carrying out pollutant transport simulation, and fully consider under windy conditions
Influence to variety classes pollutant transport.
Invention content
The present invention propose one be suitable for numerical simulation classification of pollutant method, according to pollutant water body presence
Pollutant is divided into four classes by form：The first kind is I class that suspends, and the pollutant of the type is present in the form of suspending in water body,
And its hydrodynamic property is identical as water particle, synchronous with the movement of water particle during exercise, this pollutant is with excrement large intestine
Bacterium is representative；Second class is II class that suspends, and the pollutant of the type is also to be present in water in the form of suspension, but due to it
Own physical property and water particle difference are larger, therefore this pollutant is not fortune synchronous with water body particle during the motion
It is dynamic, but have a certain difference, this pollutant is with polybag etc. for representative；Third class is I class of floating, this pollutant master
Will be based on petroleum hydrocarbons, kinetic property is complex, including diffusion, evaporation, dissolving, emulsification, light degradation and life
Object is degraded and the physical mechanisms such as absorption；4th class be floating II class, this pollutant be also moved in the form of floating, but
To be different from petroleum hydrocarbons, physicochemical properties are relatively stable, diffusion, evaporation, dissolving, emulsification, light degradation and
The processes such as biodegradable and absorption can be ignored, this pollutant is to float on the foam of the water surface as representative.
The present invention analyzes the windy conditions influence different to this four pollutant, and proposes one and fully consider strong wind
Numerical model of the condition to different type pollutant effect.Ship waste under windy conditions is proposed on the basis of the model
The forecasting procedure that bathing beach environment is influenced.
Description of the drawings
Fig. 1 is the technology path schematic diagram of the present invention, and Fig. 2 is the schematic diagram of four kinds of different types of pollutants.
Specific implementation mode
The present invention will be with a set of three-dimensional for incorporating SWAN waves model, FVCOM flow field models and FVCOM sediment models
Based on wave-stream-silt coupling model, the flow field needed for pollutant diffusion model and wave field information is calculated.Wherein
Three-dimensional wave-stream-silt coupling model forces the wind field data being calculated using WRF Atmospheric models as surface, and uses
Drive condition of the Tidal Information that TPXO tidal models calculate as model boundary.Pollutant spreads mould will be with Lagrangian example
Based on tracer technique, and the pollutant diffusion submodel of the different pollutant types of a variety of correspondences is incorporated, and expanded in greasy dirt
It dissipates in model and fully considers influence of the wind to variety classes pollutant transport.
The present invention specific implementation step be：1. be calculated wind field data by WRF Atmospheric models, and by wind field data
It is input in three-dimensional wave-stream-silt coupling model.2. three-dimensional wave-stream-silt is calculated by TPXO tidal models to couple
The corresponding Tidal Information opened at boundary point of model, and driving model is come with this.3. using three-dimensional wave-stream-silt coupled mode
Type carries out the calculating of flow field and wave field, and result of calculation is exported and gives pollutant diffusion model, is spread for pollutant
Simulation.4. before running pollutant diffusion model, the relevant information for first inputting ship waste pollutant, relevant information packet are needed
It includes：The position of pollution sources, the pollutant kind contained by pollution sources (are divided according to classification of pollutant method proposed by the present invention
Class), each amount of pollutant etc..5. pollutant diffusion model is according to the contaminant information of input, according to different pollutant types
The simulation that corresponding sub- pollutant model carries out pollutant diffusion is given respectively.6. pollutant is spread mould by pollutant diffusion model
Intend as a result, being exported together to sea in conjunction with information such as position, the bathing beach environmental evaluation indexs of the given bathing beach of user
Shore outdoor bathing place assessment models are assessed.7. final show that ship waste influences caused by different bathing beach environment are possible,
Realize the purpose of forecast.
Since existence form is different in water body for pollutant, there is also huge differences to its impact effect for wind.It is right
For the pollutant for I class that suspends, the movement of pollutant can regard that the movement with water particle is synchronous as, and wind moves it
Influence be mainly reflected in the influence of wind current and wind wave action stream field, this influence can be directly by the influence of wind stream field
It embodies.This kind of dirt is being considered since there are larger differences with water particle for its physical property for the pollutant of suspension II
When contaminating object movement, we will fully take into account this species diversity.This pollutant can be analogous to movement of the silt in water body, only
It is that there are larger differences with silt for the properties such as its density grain size.For sediment movement, in order to consider that it is moved in water body
When and water body particle between otherness, people commonly use the diffusion coefficient that one is different from thermohaline in water to realize, are analogous to mud
Sand grain, the present invention propose the diffusion coefficient equation of II pollutant that is suitable for suspending：
εp=α εw#(1)
Wherein：
ε in formula (1)pThe vertical diffusion coefficient of pollutant, εwIt is the vertical diffusion coefficient of thermohaline, α is a ratio system
Number, proportionality coefficient are provided by formula (2), and w is sinking speed of the pollutant in clear water, u in formula (2)*It is drag velocity, ρp
It is pollutant density, D50, pIt is the grain size of pollutant, ρwIt is water body density.For I pollutant of floating, we will use a packet
Spread in water containing oil spilling, advection, extension, evaporation, dissolving and emulsion process model, the wherein extension of greasy dirt is public using Lehr
Formula：
In formula：LminFor ellipse short shaft length (m)；LmaxFor the length (m) of transverse；Δ ρ=ρw-ρ0, ρw, ρ0Respectively
For the density of oil and water；W is wind speed (knot)；V is initial oil spilling volume (barrel)；T is the time (min).According to Lehr public affairs
Formula can calculate the expanding area of slick in each time step.
Advection therein by the flow field calculated by three-dimensional wave-stream-silt coupling model be added Lagrangian back tracking method come
Simulation, diffusion will be calculated by MY-2.5 models.Wherein since greasy dirt floats on extra large surface, in windy conditions
It down will special consideration should be given to the influences that wind-stress spreads greasy dirt to have the centre bit of example under the collective effect of flow field and wind-stress
The new position floated to after the Δ t times is set to be calculated with following formula：
X=X0+uΔt+αVwcosθ·Δt#(5)
Y=Y0+vΔt+αVwsinθ·Δt#(6)
In formula：U, v is the tidal current speed of t moment；VwFor sea 10m wind speed, a is wind factor, is taken as 0.03 herein.
Reality is more restored, invention also contemplates that the random walk of elaioleucite, and indicated using following formula：
Wherein：Uniform random numbers of the R between [- 1,1]；kaFor the turbulent diffusivity on the directions a；When Δ t is
Between step-length.
Evaporation process is indicated using the formula of Mackay：
In formula：E is evaporation rate, and A, B are constant (A=6.3, B=10.3), T derived from distillation curve0It is to correct distillation song
The initial boiling point of line, TGFor the gradient of modified distillation curve, r is the surface temperature (K) of oil,
VmFor wind speed at the 10m of sea, V0For initial oil spilling volume.
Emulsification will be indicated by moisture content：
In formula：YmFor emulsion water content (%), smooth is to be influenced (usually to take 4.5 × 10 by wind speed-6), UwFor wind speed, For final water content (usually taking 0.8), t is the time.
For floating II pollutant, it is characterized in that pollutant is at water air interface, there is part to be located in air, there is portion
Divide and be in water, the movement of pollutant in this case will need to examine respectively for the influence of air (wind-stress) and flow to it
Consider, will consider II pollutant of floating respectively in a model by the effect of wind-stress and acting on for water flow impact pressure, and find out two
The force action of person spreads to simulate the movement of the pollutant.
For the contaminant information needed for pollutant diffusion model, the position of ship (pollution sources), various dirts should be included
The content of object is contaminated, wherein needing to illustrate its corresponding average grain diameter and averag density for II pollutant that suspends, this two
A information will act as the calculating of relevant parameter in pollutant diffusion model, the content that contaminant information is included such as following table：
For bathing beach environmental assessment model, we need the location information of the given bathing beach to be predicted of user
File, this document should be provided with bathing beach name, the form of corresponding longitude, corresponding latitude.It has been contained in the present invention
Correspondence between a set of bathing beach environmental rating and different pollutants will be given tacit consent to if in addition user does not specify
It is assessed using this set standard, the standard is as follows：
Claims (4)
1. the forecasting procedure that the ship waste under a kind of windy conditions influences bathing beach environment, it is characterised in that：
With a set of three-dimensional wave-stream-silt coupling for incorporating SWAN waves model, FVCOM flow field models and FVCOM sediment models
Based on molding type, the flow field needed for pollutant diffusion model and wave field information is calculated.Wherein three-dimensional wave-stream-mud
Husky coupling model forces the wind field data being calculated using WRF Atmospheric models as surface, and uses TPXO tidal models
Drive condition of the Tidal Information of calculating as model boundary.Pollutant spreads mould will be using Lagrangian example tracer technique as base
Plinth, and the pollutant diffusion submodel of the different pollutant types of a variety of correspondences is incorporated, and in greasy dirt diffusion model fully
Consider influence of the wind to variety classes pollutant transport.
2. the forecast side that the ship waste under a kind of windy conditions as described in claim 1 influences bathing beach environment
Method, it is characterised in that：Propose one be suitable for numerical simulation classification of pollutant method, according to pollutant water body presence
Form and pollutant mode affected by wind, are divided into four classes by pollutant.
3. the forecast side that the ship waste under a kind of windy conditions as described in claim 1 influences bathing beach environment
Method, it is characterised in that：Corresponding different types of pollutant provides four kinds of different types of pollutant diffusion submodels, to not
Diffusion with pollutant species is simulated.
4. the forecast side that the ship waste under a kind of windy conditions as described in claim 1 influences bathing beach environment
Method, it is characterised in that：The index of a set of assessment bathing beach environmental quality is given on the basis of analog result, and makes this
Final realize of invention forecasts the influence of the environment of bathing beach.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112016226A (en) * | 2020-08-13 | 2020-12-01 | 中国地质大学深圳研究院 | Three-dimensional simulation method and device for offshore oil spill |
| CN112749520A (en) * | 2021-01-20 | 2021-05-04 | 中国科学院南京地理与湖泊研究所 | Three-dimensional hydrodynamic force numerical model modeling method for large shallow lake |
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| CN102663222A (en) * | 2011-12-27 | 2012-09-12 | 中国科学院生态环境研究中心 | Calculating method for dynamic pollution field of open water body emergent pollution accident |
| CN104153332A (en) * | 2014-07-18 | 2014-11-19 | 天津大学 | Trash cleaning engineering layout method based on migration paths of floaters on the water |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112016226A (en) * | 2020-08-13 | 2020-12-01 | 中国地质大学深圳研究院 | Three-dimensional simulation method and device for offshore oil spill |
| CN112016226B (en) * | 2020-08-13 | 2021-05-18 | 中国地质大学深圳研究院 | Three-dimensional simulation method and device for offshore oil spill |
| CN112749520A (en) * | 2021-01-20 | 2021-05-04 | 中国科学院南京地理与湖泊研究所 | Three-dimensional hydrodynamic force numerical model modeling method for large shallow lake |
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