CN104631377A - Design method of encircled harbor area water exchange passage - Google Patents

Abstract

The invention discloses a design method of an encircled harbor area water exchange passage. The method comprises the following steps: on the basis of an established and verified two-dimensional tide numerical model, adding a convective-diffusion module to calculate a material transmission process; evaluating and analyzing the water exchange effect of the harbor area by virtue of the calculating convective-diffusion module; analyzing key factors determining the water exchange capacity of the encircled harbor area as well as a water exchange passage selecting principle; constructing single-passage and multi-passage harbor area water exchange effect researches; and forming the design method of the encircled harbor area water exchange passage. By simulating the construction of encircled harbor areas in different engineering schemes, the design method disclosed by the invention can analyze the water exchange effects of the encircled harbor areas, discover the key factors determining the water exchange capacity of the encircled harbor areas as well as the water exchange passage selecting principle, and research the single-passage and multi-passage water exchange effects of harbor area construction.

Description

The method for designing of water body interchange channel, district, a kind of encircling type port

Technical field

The present invention relates to the method for designing of water body interchange channel, district, a kind of encircling type port, belong to harbor approach field of engineering technology.

Background technology

In recent years along with the fast development of China's Port Economic, deep shoreline resources worsening shortages.Build encircling type port district and effectively can increase coastline resource, simultaneously can also wave resistance sand, improve mooring conditions.But encircling type port district exists the weak feature of water body exchange capacity, water body interchange channel is the effective ways improving encircling type port district water body exchange capacity.

At present, the discussion of the research of the research adopting water body interchange channel to improve encircling type port district water body exchange capacity mainly being applied in actual marine site about the numerical method of Convection-Diffusion Model and the engineering Improving Measurements to water body interchange channel.Propose in " research of excavated basin water body exchange capacity " literary composition that the people such as He Jie to deliver at " Journal of Hydraulic Engineering " supplementary issue in October, 2007, for Nansha Harbor, PORT OF GUANGZHOU excavated basin, the calculating of section tide amount is gushed by the numerical simulation of tidal movement and river, inquire into the position of linked river and open mode, effectively can play the effect that basin and extraneous water body exchange, but the method also exists following obviously not enough: one is still unintelligible to water body exchange capacity mechanism understanding, and described engineering measure scheme is theoretically unsound; Two is do not study the cross dimensions of water body interchange channel, does not provide the design parameters of concrete engineering measure.Propose in " surrounding basin water body exchange with Improving Measurements study " literary composition that the people such as Zhang Wei delivered in " marine traffic engineering " 04 phase in 2013, for the Xu Xugang district, Lianyun Harbour in planning, utilize Convection-Diffusion Model method, surrounding basin water body half exchange cycle under the effect of analog computation trend, to inquire into engineering measure and the effect thereof of improving basin water quality, but the method exists following obviously not enough equally: the mechanism that a Shi Weiduigang district water body exchanges is studied; Two is the design parameterss specifically not providing engineering measure.Therefore, how to overcome the deficiencies in the prior art and become one of emphasis difficult problem urgently to be resolved hurrily in current harbor approach field of engineering technology.

Summary of the invention

In order to solve above-mentioned Problems existing, the invention discloses the method for designing of water body interchange channel, district, a kind of encircling type port, concrete technical scheme is as follows:

A method for designing for water body interchange channel, encircling type port district, comprises following concrete steps:

Step one, sets up planar Convention diffusion Mathematical Modeling: setting up and on the basis of the Two Dimensional Tidal Current Mathematical Modeling verified, increasing Convention diffusion module, utilize the transmitting procedure of the hydrodynamic force result substance for calculation of tide model; When carrying out trend numerical computations, the border of opening of model is provided by eastern China seas tidal wave Mathematical Modeling, model close border according to can not enter principle follow the example of to flow velocity be 0, adopt dry wet method of discrimination to carry out moving boundary process simultaneously, the hydrological data of actual measurement is utilized to carry out calibration to the parameter of model, after checking reaches required precision, carry out NUMERICAL SIMULATION OF TIDAL again, the governing equation of planar tidal current mathematical model has: formula (1) current equation of continuity and formula (2) and formula (3) water movement equation, as follows:

$\frac{\∂h}{\∂t}+\frac{\∂h\stackrel{\‾}{u}}{\∂x}+\frac{\∂h\stackrel{\‾}{v}}{\∂y}=0---\left(1\right)$

$\frac{\∂h\stackrel{\‾}{u}}{\∂t}+\frac{\∂h{\stackrel{\‾}{u}}^2}{\∂x}+\frac{\∂h\stackrel{\‾}{\mathrm{vu}}}{\∂y}=f\stackrel{\‾}{v}h-\mathrm{gh}\frac{\∂\mathrm{\η}}{\∂x}-\frac{{\mathrm{\τ}}_{\mathrm{bx}}}{{\mathrm{\ρ}}_0}+\frac{\∂}{\∂x}\left(h{T}_{\mathrm{xx}}\right)+\frac{\∂}{\∂y}\left({\mathrm{hT}}_{\mathrm{xy}}\right)---\left(2\right)$

$\frac{\∂h\stackrel{\‾}{v}}{\∂t}+\frac{\∂h{\stackrel{\‾}{v}}^2}{\∂y}+\frac{\∂h\stackrel{\‾}{\mathrm{uv}}}{\∂x}=-f\stackrel{\‾}{u}h-\mathrm{gh}\frac{\∂\mathrm{\η}}{\∂y}-\frac{{\mathrm{\τ}}_{\mathrm{by}}}{{\mathrm{\ρ}}_0}+\frac{\∂}{\∂y}\left(h{T}_{\mathrm{yy}}\right)+\frac{\∂}{\∂x}\left({\mathrm{hT}}_{\mathrm{xy}}\right)---\left(3\right)$

Wherein, x, y are cartesian coordinate; T is time variable; η is water level; H represents total depth of water, and has h=d+ η, and d is that hydrostatic is dark; for x, y direction depth-averaged speed; τ _bx, τ _byfor x, y direction bottom stress; ρ ₀for the density of water; F is coriolis force coefficient, and g is local gravitational acceleration; T _xx, T _yy, T _xyfor horizontal viscous stress item;

On the basis of the satisfactory planar tidal current mathematical model of checking, add Convention diffusion module, set up Convention diffusion Mathematical Modeling, convective-diffusion equation is shown in formula (4) and formula (5):

$\frac{\∂h\stackrel{\‾}{C}}{\∂t}+\frac{\∂h\stackrel{\‾}{u}\stackrel{\‾}{C}}{\∂x}+\frac{\∂h\stackrel{\‾}{v}\stackrel{\‾}{C}}{\∂y}=h{F}_C---\left(4\right)$

$F_C=[\frac{\∂}{\∂x}\left(D_h\frac{\∂}{\∂x}\right)+\frac{\∂}{\∂y}\left(D_h\frac{\∂}{\∂y}\right)]C---\left(5\right)$

Wherein, the average scalar of-vertical line; F _c-horizontal proliferation item; D _h-horizontal proliferation coefficient;

Step 2, calculates Convection-Diffusion Model, exchanges effect carry out evaluation analysis to the water body in port district: the calculating prerequisite supposition water body concentration of Convention diffusion Mathematical Modeling is for being uniformly distributed, and given initial basin internal contamination substrate concentration is G ₀=1, the outer water body concentration of basin is G ₁=0; Under trend effect, inside and outside bay, water body produces and exchanges, by exchanging, gulf pool inner water body is constantly updated, concentration reduces gradually, in pond, gulf, mean concentration becomes: 0<G<1, and when the mean concentration in pond, gulf is reduced to 0.5, the time used is half exchange cycle of water body; Using water body half exchange cycle as evaluation index, half exchange cycle is short, shows that water body exchange capacity is strong; Half exchange cycle is long, then show that water body exchange capacity is weak;

Step 3, engineering proposal calculates, analyze and determine the key factor of encircling type port district water body exchange capacity and the selection principle of water body interchange channel: on the basis of the Convection-Diffusion Model of above-mentioned foundation, the waters exchanging effect poor at basin water body arranges water body interchange channel, build into single channel and multichannel port district, passage section is rectangle, certain impact can be produced because different section yardsticks exchanges effect to the water body of basin, according to different in width and bottom surface elevation design engineering proposal, carry out the simulation of tidal movement and Convention diffusion respectively; The model calculation of each scheme is processed and comparative analysis, draws and determine the key factor of encircling type port district water body exchange capacity and the selection principle of water body interchange channel;

Step 4, build single channel and multichannel port district water body exchange Effect disquisition, analyze distribution method and the points for attention of water body interchange channel, encircling type port district: based on the identical engineering proposal of cross dimensions of water body interchange channel, port district, change the channel setting scheme in multichannel port district, become single channel port district, and carry out the analog computation of tidal movement and Convention diffusion, exchange Contrast on effect with engineering proposal Shi Lianggang district water body respectively, draw distribution method and the points for attention of water body interchange channel, encircling type port district;

Step 5, form the method for designing of water body interchange channel, encircling type port district: the passage be dominant into tide is selected in water body interchange channel, and channel setting is at the upstream extremity in Propagation of Tidal direction, to increase the phase difference of tidal level process line between passage and mouth door, improve tidal prism and water correction ability; Build multichannel encircling type port district in addition, avoid occurring that its contiguous basin is respectively and to be dominant and to go out tide into tide and to be dominant the situation of passage.

The discrete employing non-structure triangular mesh of described model zoning, Engineering Zone net lattice control yardstick 40 ~ 70m.

Border, described land according to can not enter principle follow the example of to flow velocity be 0.

Described on the basis of the tidal current mathematical model verified, add Convention diffusion module, utilize the hydrodynamic force result substance for calculation transmitting procedure of tide model; Concentration in Convection-Diffusion Model opens border, and to be defined as water body concentration when becoming a mandarin be 0, ignores diffusion term when going out to flow.

The described Convection-Diffusion Model that utilizes is simulated port district water body concentration, and computing time is no less than one month.

Design principle of the present invention: enter the tide improvement effect of passage to port district water body exchange capacity that be dominant and be better than tide and be dominant passage, the passage be dominant into tide should be selected in water body interchange channel; The key factor of decision encircling type port district water body exchange capacity is passage tidal prism, improve the water correction effect that tidal prism can carry Gaogang District, and the tidal range at passage and mouth door place is the major influence factors of passage tidal prism of being dominant into tide, so the determination of passage should to improve the tidal range at passage and mouth door place, thus the tidal prism improving encircling type port district is criterion; If build its contiguous basin of multichannel encircling type port district to be respectively and to be dominant and to go out tide into tide and to be dominant passage, polluted-water is easily assembled to going out the tide passage basin that is dominant and is caused its basin water quality to worsen further, so answer special concern and avoid this situation.

The present invention compared with prior art its remarkable advantage is: one is the encircling type port district that the present invention passes through that different engineering proposal is built in simulation two, the water body analyzing them exchanges effect, discloses and determines the key factor of encircling type port district water body exchange capacity and the selection principle of water body interchange channel; Two is that research port district builds single channel and multichannel water body exchanges effect, obtains water-outlet body interchange channel distribution method and points for attention, and then obtains the method for designing of water-outlet body interchange channel, make water body interchange channel can better improve port district water quality.

Accompanying drawing explanation

The final programme schematic diagram in Tu1Shi Lianyun Harbour district,

The final programme schematic diagram in Tu2Shi Xuxu port district,

Fig. 3 is Lianyun Harbour Mathematical Modeling scope schematic diagram,

Tu4Shi Lianyun Harbour district initial concentration distribution map,

Tu5Shi Xuxu port district initial concentration distribution map,

Tu6Shi Lianyun Harbour district water body interchange channel arrangement and sampled point arrangement diagram,

Tu7Shi Xuxu port district water body interchange channel arrangement and sampled point arrangement diagram,

The tidal level duration curve figure at Tu8Shi Lianyun Harbour district mouth door and section L1 place,

The tidal level duration curve figure at Tu9Shi Xuxu port district mouth door and section L1 place.

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, illustrate the present invention further.Following detailed description of the invention should be understood only be not used in for illustration of the present invention and limit the scope of the invention.

The present invention, in a specific embodiment for Lianyun Harbour district and Xu Xugang district, illustrates the application of the present invention in the section planning of actual port, comprises following concrete steps:

Step one, set up planar Convention diffusion Mathematical Modeling:

Model scope: west is from existing water front, North gets sunshine (35 ° 22 ' 30 " N; 119 ° of 33 ' E); to the east of (35 ° 22 ' 30 " N, 120 ° of 17 ' E), reach useless Near The Mouth of Yellow River (34 ° 17 ' 00 " N; 120 ° of 17 ' E) in the south; the wide about 100km of thing, north and south is about 120km, and in model scope, water surface area is about 8650km ², refer to Fig. 3.The discrete employing non-structure triangular mesh of model zoning, Engineering Zone net lattice control yardstick 40 ~ 70m.

West circle in model, south bound are border, land, according to can not enter principle follow the example of to flow velocity be 0; North circle, in the east boundary are water boundaries, are provided by eastern China seas tidal wave Mathematical Modeling; Filling with river bank circle is positioned near Xiangshui bridge, is provided by Guan He long river segment model.

The checking of tidal current mathematical model adopts the tidal level process in September, 2005 multiple tidal level station and the flow rate process of multiple trend measuring point.Checking shows, tidal level, flow velocity and the flow direction that marine site, Lianyun Harbour tidal current mathematical model calculates all are coincide better with field data, can reflect the characteristics of motion of substance trend preferably, can be used for engineering problem research.

On the basis of the marine site, Lianyun Harbour verified tidal current mathematical model on a large scale, add Convention diffusion module, utilize the hydrodynamic force result substance for calculation transmitting procedure of tide model; Concentration in Convection-Diffusion Model opens border, and to be defined as water body concentration when becoming a mandarin be 0, can ignore diffusion term when going out to flow; Lianyun Harbour district and Xu Xugang district water body concentration initial value are arranged and are seen Fig. 4 and Fig. 5.

Step 2, calculates Convection-Diffusion Model, exchanges effect carry out evaluation analysis to the water body in Liang Gang district:

Utilize Convection-Diffusion Model to simulate Lianyun Harbour district and Xu Xugang district water body concentration, computing time is on October 4,4 days to 2005 September in 2005; Adopting water body half exchange cycle to evaluate Liang Gang district water body exchange capacity, because the water body exchange capacity of port district regional is different, therefore when specifically evaluating, discussing according to water body half exchange cycle subregion; The each waters in Lianyun Harbour district and Xu Xugang district water body half exchange cycle in programme added up respectively by table 1 and table 2, result shows: it is better that district of Lianyun Harbour district III and IV district's water body exchange effect, half exchange is completed respectively in 7 days and 2 days, it is poor that Ith district and II district's water body exchange effect, and wherein Ith district remains unfulfilled water body half exchange in 30 days; It is better that Xu Xugang district three, five, six basin water body exchanges effect, and in 5 days, water body completes half exchange, and it is poor that one, two, four basin water bodys exchange effect, and water body half exchange cycle was more than 10 days, and the water exchange flux of Qi Zhongyi, two basins is respectively 17 days and 18 days.

Programme each region half, table 1 Lianyun Harbour exchange cycle (my god)

Table 2 Xu country fair port planning each region half exchange cycle (my god)

Step 3: engineering proposal calculates, analyze and determine that encircling type port district water body exchanges the key factor of effect and the selection principle of water body interchange channel:

One is full scale constructed wetland project design: based on programme, and the waters of intending exchanging effect poor in Lianyun Harbour district and Xu Xugang district water body arranges water body interchange channel.According to above result of calculation, the water body exchange capacity in end I district of Lianyun Harbour district is the most weak, and the water body exchange effect of Xu Xugang district one, two, four basin is also poor, so intend arranging water body interchange channel in above-mentioned waters, refers to Fig. 6 and Fig. 7; Water body interchange channel section is rectangle, certain impact can be produced because different section yardsticks exchanges effect to the water body of basin, so divide engineering proposal according to different in width and bottom surface elevation, table 3 and table 4 have added up each scheme cross dimensions and average discharge area, wherein, average discharge area is defined as the height of mean sea level to channel bottom and the product of passage section width.The engineering proposal contrasting above-mentioned Liang Gang district is visible, and the passage of Lianyun Harbour area scheme five and Xu Xu port area scheme three has identical bottom surface elevation and width, can exchange the basis of effectiveness comparison, should pay close attention to as Liang Gang district water body.When each prescription case calculates, initial time arranges the water body concentration G of port district and water body interchange channel ₀=1.0, be clear water outside the district of port, G ₀=0, all the other optimum configurations are identical with the Mathematical Modeling of programme.

Table 3 Lianyun Harbour district each scheme cross dimensions and average discharge area

Table 4 Xu Xugang district each scheme cross dimensions and average discharge area

Two Shi Lianggang district water bodys exchange effect analysis: for more each scheme water body interchange channel exchanges effect and hydrodynamic impact to port district water body, added up water body half exchange cycle (referring to table 6) of each basin in each scheme of water body half exchange cycle (referring to table 5) and Xu Xugang district in I, II, III, IV waters in each scheme in Lianyun Harbour district.

Table 5 Lianyun Harbour district each scheme water body half exchange cycle (my god)

Table 6 Xu Xugang district each scheme water body half exchange cycle (my god)

(1) as can be seen from Table 5, Lianyun Harbour district is shorter and shorter from scheme one to scheme Liu Gegang district half exchange cycle, and water body exchanges effect and becomes better and better; From scheme two, half exchange cycle in each port district is all less, the I district poor to water body exchange effect under programme and IIth district also have clear improvement, I district from scheme at the beginning half exchange cycle be just less than 13 days, 30 days under programme, IIth district from scheme at the beginning half exchange cycle just below 16 days, be also better than 20 days during programme; Along with the increase of passage section area, the longer region of half exchange cycle goes to IIIth district by IIth district gradually, the trend of namely oriented mouth door transfer, and III district half exchange cycle number of days increases to some extent than during programme, but the longlyest only has 14 days.

(2) as shown in Table 7: except one or two basins, the water body exchange capacity of all the other basins is all better, builds the later half exchange cycle in water body interchange channel all less, therefore needs to pay close attention to one or two basins.During programme, half exchange cycle of a basin is 18 days, and after building water body interchange channel, scheme one and scheme 2 half exchange cycle are all 17 days, DeGrain, and from scheme three, half exchange cycle is all less than 7 days, successful; Two basins are behind construction water body interchange channel, scheme one to scheme three because of passage section area less, half exchange cycle is longer, reach most 23 days, 17 days that are longer than programme on the contrary, effect was poor, scheme four to scheme six because of water body interchange channel cross dimensions larger, half exchange cycle of two basins also drops to 14 days and following gradually, and water body exchanges effect and improves.

Three is analyses of causes that water body exchanges effect: for analysis Lianyun Harbour district and Xu Xugang district water body exchange the reason improving effect, arrange traffic sampling section L1 (see Fig. 6) at water body interchange channel, Lianyun Harbour district end points and arrange traffic sampling section N1, N2, N4 (see Fig. 7) at water body interchange channel, Xu Xugang district end points respectively, calculate the tide amount of section of sampling between spring season respectively, refer to table 7 and table 8.Herein specify: current flow to the basin period through water body interchange channel, for entering damp process, passage section flow be on the occasion of, tide amount be tidal prism; Current flow out the basin period through water body interchange channel, and for going out damp process, passage section flow is negative value, and tide amount is for going out tide amount.

Table 7 Lianyun Harbour district each prescription case tide amount statistics

Table 8 Xu Xugang district each prescription case tide amount statistics

(1) from table 5 and table 7, along with the increase that each scheme passage section is long-pending, tidal prism and the damp total amount of turnover of passage have obvious increasing trend, and Lianyun Harbour district water body exchanges effect and also becomes better and better.Go out tide amount and clean tide amount as passage, the variation tendency of Ze Yugang district water body exchange capacity is also inconsistent, and as going out of scheme three and scheme four damply measures identical, but the exchange effect of scheme four is better than scheme three; The clean tide amount of passage of scheme one is greater than scheme two, but the exchange effect of scheme two is better than scheme one.It is consistent that viewability channel tidal prism and the turnover variation tendency of damp total amount and the water body in Lianyun Harbour district exchange effect.Again according to table 6 and table 8 visible, for Xu Xu port area scheme three, the water body of one basin exchanges effect and is better than two basins, the tidal prism of one basin passage is also greater than two basins, but the turnover of basin tide total amount is less than two basins, as can be seen here, only have tidal prism to be only and determine that port district water body exchanges the single factor of effect.Main cause is: along with the increase of tidal prism, and basin introduces more open seawater, and the polluted-water in dilution basin, port district water quality improves.

(2) as can be seen from Table 8, the clean tide amount of Xu Xugang district one basin passage is all greater than zero, and for entering the water body interchange channel that tide is dominant, the clean tide amount of two basin passages is all less than zero, for going out the water body interchange channel that tide is dominant.Half exchange cycle being added up Xu Xugang district by table 6 can be found out, the water body of a basin exchanges effect and is better than two basins, known enter the passage that is dominant of tide have basin water quality and better improve effect.Reason is: for the passage entering tide and be dominant, and the open seawater flowing into basin is many, and strong to the polluted-water diluting effect in basin, polluted-water concentration easily reduces; Go out tide be dominant the tidal prism of passage little go out tide amount large, the less dilution obtaining open seawater of polluted-water in basin, follow out the sewage that tide discharges basin, the outer shoal of basin is difficult to rapid diffusion, part of contaminated water easily by follow-up enter tidal water flow again bring in basin, cause basin water quality be difficult to be improved significantly.In addition, a basin and two basins form again a passage run through (see Fig. 2), then enter polluted-water in the basin that tide is dominant and easily assemble to going out two basins that tide is dominant, also cause the exchange capacity of two basin water bodys to be difficult to improve.

In sum, tidal prism is the main determining factor that surrounding basin water body exchange capacity improves; Enter passage that tide is dominant and the improvement effect that basin water body exchanges is better than the passage that tide is dominant.

Step 4: build single channel and multichannel port district water body exchange Effect disquisition, analyze distribution method and the points for attention of water body interchange channel, encircling type port district:

One is that Xu Xu port area scheme three single channel is arranged: for Xu Xu port area scheme three, change the set-up mode of water body interchange channel, namely only establish single water body interchange channel: only establish passage one (N1-W1 in Fig. 7) or only establish passage two (N2-W2 in Fig. 7).Carry out scheme calculate time, initial time arrange and optimum configurations all identical with the Mathematical Modeling of programme.According to result of calculation, do to add up as follows: by Convection-Diffusion Model result of calculation, statistics obtains water body half exchange cycle of each basin under both of these case, refers to table 9; Traffic sampling section N1 or N2 (Fig. 7) is arranged at water body interchange channel end points, the flow of each sampling section between spring season is calculated by hydrodynamic force module, and to flow time course integration, obtain the tide amount (see table 10) of each sampling section.

Water body half exchange cycle of table 9 Xu's country fair harbor master plan scheme three open walks one or passage two

Table 10 Xu's country fair harbor master plan scheme three open walks one or passage two tide amount statistics

Two is analyze the points for attention that multichannel builds: according to Xu Xugang district multichannel half exchange cycle (table 6), inflow and outflow (table 8) and single channel result of calculation (table 9 and table 10), comparative analysis arranges single channel and the multichannel improvement effect for water body exchange capacity.

(1) water correction effect single channel in Xu Xugang district is better than multichannel.Contrast table 6 and table 9 known, for the moment, half exchange cycle of one, two basins is 14 days and 15 days for open walk, and water body exchanges effect and all makes moderate progress; When Xu Xugang district opens three water body interchange channels, half exchange cycle of a basin is 7 days, and water body exchanges better effect improved, but half exchange cycle of two basins needs 23 days, and effect is poor.

(2) influencing each other between basin is cause multichannel water body to exchange the poor main cause of effect.Contrast table 8 and table 10 known, during multichannel, a basin enters tide and is dominant, and two basins go out tide and are dominant, the trend gathered of oriented two basins of sewage that a basin is discharged, and only establishes passage for the moment, and basin influences each other disappearances, and water body exchange effect is relatively better.

Three is that the laying mode of water body interchange channel is studied: for Xu Xugang district single channel scheme (passage one scheme), because section yardstick and Lianyun Harbour area scheme cause May Day, so, compare mainly for both at this, and analyze with regard to related causes.

(1) water body in Lianyun Harbour district exchanges and improves effect and be better than Xu Xugang district.Contrast table 5 and table 9 known, the I district of Lianyun Harbour area scheme five has and well improves effect, and half exchange cycle is only 1 day, and IIth district, IV district's water body exchange effect all in 6 days, only have the water body in IIIth district exchange effect relatively length be 12 days; For the moment, half exchange cycle of one, two basins then needs 14 days and 15 days for open walk.

(2) passage tidal prism is the main cause that Lianyun Harbour district water body exchange effect is better than Xu Xugang district.From table 7 and table 10, Lianyun Harbour district and Xu Xugang district are and are dominant passage into tide, and the tidal prism of Lianyun Harbour area scheme five is 6.8 × 10 ⁶m ³, the passage tidal prism of a Xu Xugang district open walk one is 3.4 × 10 ⁶m ³, the former is the twice of the latter, and the improvement effect for water quality is also comparatively obvious.

(3) passage and mouth door place tidal range are the principal elements affecting passage tidal prism.As can be seen from Fig. 8 and Fig. 9, there is obvious phase difference between the tidal level process at passage place of Lianyun Harbour district and mouth door, during mean tide tlevel to high water mark, the tidal level at passage place wants high, and tidal range is comparatively large, is order about the major impetus that outside seawater enters port district; Comparatively speaking, Xu Xugang district passage one is relatively little with the tidal range at mouth door place, and tidal prism is less, and water correction effect is relatively weak.In practical engineering application, as preliminary judgement, passway should be arranged on the upstream extremity of the flood tide direction of propagation as far as possible, to increase the phase difference of tidal level process line between passage and mouth door, improve tidal prism and water correction ability.

Step 5, forms the method for designing of water body interchange channel, encircling type port district:

The passage be dominant into tide should be selected in water body interchange channel, and passage should be arranged on the upstream extremity in Propagation of Tidal direction as far as possible, to increase the phase difference of tidal level process line between passage and mouth door, improves tidal prism and water correction ability; Build the encircling type port district of many water body interchange channels in addition, should avoid occurring that its contiguous basin is respectively to be dominant and to go out tide into tide and to be dominant the situation of passage, because polluted-water can be caused to assemble to going out the tide passage basin that is dominant and cause its basin water quality to worsen further.

The present invention, through validation trial, achieves satisfied effect.

Claims (5)

1. a method for designing for water body interchange channel, encircling type port district, is characterized in that comprising following concrete steps:

Step one, sets up planar Convention diffusion Mathematical Modeling: setting up and on the basis of the Two Dimensional Tidal Current Mathematical Modeling verified, increasing Convention diffusion module, utilize the transmitting procedure of the hydrodynamic force result substance for calculation of tide model; When carrying out trend numerical computations, the border of opening of model is provided by eastern China seas tidal wave Mathematical Modeling, model close border according to can not enter principle follow the example of to flow velocity be 0, adopt dry wet method of discrimination to carry out moving boundary process simultaneously, the hydrological data of actual measurement is utilized to carry out calibration to the parameter of model, after checking reaches required precision, carry out NUMERICAL SIMULATION OF TIDAL again, the governing equation of planar tidal current mathematical model has: formula (1) current equation of continuity and formula (2) and formula (3) water movement equation, as follows:

$\frac{\&PartialD;h}{\&PartialD;t}+\frac{\&PartialD;h\stackrel{\&OverBar;}{u}}{\&PartialD;x}+\frac{\&PartialD;h\stackrel{\&OverBar;}{v}}{\&PartialD;y}=0---\left(1\right)$

$\frac{\&PartialD;h\stackrel{\&OverBar;}{u}}{\&PartialD;t}+\frac{{\&PartialD;h\stackrel{\&OverBar;}{u}}^2}{\&PartialD;x}+\frac{\&PartialD;h\stackrel{\&OverBar;}{\mathrm{vu}}}{\&PartialD;y}=f\stackrel{\&OverBar;}{v}h-\mathrm{gh}\frac{\&PartialD;\mathrm{\&eta;}}{\&PartialD;x}-\frac{{\mathrm{\&tau;}}_{\mathrm{bx}}}{{\mathrm{\&rho;}}_0}+\frac{\&PartialD;}{\&PartialD;x}\left({\mathrm{hT}}_{\mathrm{xx}}\right)+\frac{\&PartialD;}{\&PartialD;y}\left({\mathrm{hT}}_{\mathrm{xy}}\right)---\left(2\right)$

$\frac{\&PartialD;h\stackrel{\&OverBar;}{v}}{\&PartialD;t}+\frac{{\&PartialD;h\stackrel{\&OverBar;}{v}}^2}{\&PartialD;y}+\frac{\&PartialD;h\stackrel{\&OverBar;}{\mathrm{uv}}}{\&PartialD;x}=-f\stackrel{\&OverBar;}{u}h-\mathrm{gh}\frac{\&PartialD;\mathrm{\&eta;}}{\&PartialD;y}-\frac{{\mathrm{\&tau;}}_{\mathrm{by}}}{{\mathrm{\&rho;}}_0}+\frac{\&PartialD;}{\&PartialD;y}\left({\mathrm{hT}}_{\mathrm{yy}}\right)+\frac{\&PartialD;}{\&PartialD;x}\left({\mathrm{hT}}_{\mathrm{xy}}\right)---\left(3\right)$ Wherein, x, y are cartesian coordinate; T is time variable; η is water level; H represents total depth of water, and has h=d+ η, and d is that hydrostatic is dark; for x, y direction depth-averaged speed; τ _bx, τ _byfor x, y direction bottom stress; ρ ₀for the density of water; F is coriolis force coefficient, and g is local gravitational acceleration; T _xx, T _yy, T _xyfor horizontal viscous stress item;

On the basis of the satisfactory planar tidal current mathematical model of checking, add Convention diffusion module, set up Convention diffusion Mathematical Modeling, convective-diffusion equation is shown in formula (4) and formula (5):

$\frac{\&PartialD;h\stackrel{\&OverBar;}{C}}{\&PartialD;t}+\frac{\&PartialD;h\stackrel{\&OverBar;}{u}\stackrel{\&OverBar;}{C}}{\&PartialD;x}+\frac{\&PartialD;h\stackrel{\&OverBar;}{v}\stackrel{\&OverBar;}{C}}{\&PartialD;y}={\mathrm{hF}}_C---\left(4\right)$

$F_C=[\frac{\&PartialD;}{\&PartialD;x}\left(D_h\frac{\&PartialD;}{\&PartialD;x}\right)+\frac{\&PartialD;}{\&PartialD;y}\left(D_h\frac{\&PartialD;}{\&PartialD;y}\right)]C---\left(5\right)$ Wherein, the average scalar of-vertical line; F _c-horizontal proliferation item; D _h-horizontal proliferation coefficient;

Step 2, calculates Convection-Diffusion Model, exchanges effect carry out evaluation analysis to the water body in port district: the calculating prerequisite supposition water body concentration of Convention diffusion Mathematical Modeling is for being uniformly distributed, and given initial basin internal contamination substrate concentration is G ₀=1, the outer water body concentration of basin is G ₁=0; Under trend effect, inside and outside bay, water body produces and exchanges, by exchanging, gulf pool inner water body is constantly updated, concentration reduces gradually, in pond, gulf, mean concentration becomes: 0<G<1, and when the mean concentration in pond, gulf is reduced to 0.5, the time used is half exchange cycle of water body; Using water body half exchange cycle as evaluation index, half exchange cycle is short, shows that water body exchange capacity is strong; Half exchange cycle is long, then show that water body exchange capacity is weak;

Step 3, engineering proposal calculates, analyze and determine the key factor of encircling type port district water body exchange capacity and the selection principle of water body interchange channel: on the basis of the Convection-Diffusion Model of above-mentioned foundation, the waters exchanging effect poor at basin water body arranges water body interchange channel, build into single channel and multichannel port district, passage section is rectangle, certain impact can be produced because different section yardsticks exchanges effect to the water body of basin, according to different in width and bottom surface elevation design engineering proposal, carry out the simulation of tidal movement and Convention diffusion respectively; The model calculation of each scheme is processed and comparative analysis, draws and determine the key factor of encircling type port district water body exchange capacity and the selection principle of water body interchange channel;

Step 4, build single channel and multichannel port district water body exchange Effect disquisition, analyze distribution method and the points for attention of water body interchange channel, encircling type port district: based on the identical engineering proposal of cross dimensions of water body interchange channel, port district, change the channel setting scheme in multichannel port district, become single channel port district, and carry out the analog computation of tidal movement and Convention diffusion, exchange Contrast on effect with engineering proposal Shi Lianggang district water body respectively, draw distribution method and the points for attention of water body interchange channel, encircling type port district;

Step 5, form the method for designing of water body interchange channel, encircling type port district: the passage be dominant into tide is selected in water body interchange channel, and channel setting is at the upstream extremity in Propagation of Tidal direction, to increase the phase difference of tidal level process line between passage and mouth door, improve tidal prism and water correction ability; Build multichannel encircling type port district in addition, avoid occurring that its contiguous basin is respectively and to be dominant and to go out tide into tide and to be dominant the situation of passage.

2. the method for designing of water body interchange channel, district, a kind of encircling type port according to claim 1, is characterized in that the discrete employing non-structure triangular mesh of described model zoning, Engineering Zone net lattice control yardstick 40 ~ 70m.

3. the method for designing of water body interchange channel, district, a kind of encircling type port according to claim 1, it is characterized in that border, described land according to can not enter principle follow the example of to flow velocity be 0.

4. the method for designing of water body interchange channel, district, a kind of encircling type port according to claim 1, it is characterized in that described on the basis of the tidal current mathematical model verified, add Convention diffusion module, utilize the hydrodynamic force result substance for calculation transmitting procedure of tide model; Concentration in Convection-Diffusion Model opens border, and to be defined as water body concentration when becoming a mandarin be 0, ignores diffusion term when going out to flow.

5. the method for designing of water body interchange channel, district, a kind of encircling type port according to claim 1, it is characterized in that the described Convection-Diffusion Model that utilizes is simulated port district water body concentration, computing time is no less than one month.