CN108536987A - A kind of suitable bank formula basin Sedimentation Calculation method - Google Patents
A kind of suitable bank formula basin Sedimentation Calculation method Download PDFInfo
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Abstract
The invention discloses a kind of suitable bank formula basin Sedimentation Calculation methods, it is related to a kind of Sedimentation Calculation method.Include the following steps：Step 1 is established along flow continuity equation and motion control equation in bank formula basin；Step 2 is established along bank formula Sedimentation calculation formula；Step 3 establishes trend numerical value sinks of the 30km × 20km along bank formula basin；Step 4, analyzing different basin length-width ratio stream fields influences；Step 5 establishes the variation relation for returning slot index n with flow along the ratio between bank formula basin length and width；Step 6 determines that flow returns slot index n；Step 7 is calculated based on step 2 and step 6 along bank formula basin sediment siltation thickness.The present invention improves the precision along bank formula basin Sedimentation Calculation result, to provide reliable reference frame along bank formula port development.
Description
Technical field
The present invention relates to a kind of Sedimentation Calculation methods, and in particular to a kind of suitable bank formula basin Sedimentation Calculation
Method.
Background technology
Quay is a kind of common type of port construction horizontal layout, has and water front, port area is made full use of to concentrate
Convenient for management and running.Harbour lacks the shielding of breakwater or the natural cover for defense directly facing sea.Since harbour is by tide,
The influence of wave action, Siltation Mechanism are considerably complicated.Due to quay structure frontal line generally with natural water front
Trend is consistent, is influenced on the flow path of offshore water flow smaller.Many researchers pass through mathematical model, physical model, on-site land survey
The methods of to being studied along bank formula basin sediment siltation, but most researchers often utilize open type navigation channel (silt become silted up along journey
Long-pending theory) siltation prediction formula, forecasts along the siltation situation after bank formula basin engineering, but the method along bank formula basin for becoming silted up
Product error calculated is bigger than normal.
Quay (basin) its feature is built on coastline：Since tide water body and point bar flow return the shadow of slot
It rings, keeps the siltation computation of suitable bank formula basin and general open type channel silt siltation computation different, if with generally opening
Open form channel silt Downward sedimentation computational methods are larger to its prediction error.
In conclusion the present invention devises a kind of suitable bank formula basin Sedimentation Calculation method.
Invention content
In view of the shortcomings of the prior art, purpose of the present invention is to be to provide a kind of suitable bank formula basin sediment siltation meter
Calculation method improves the precision along bank formula basin Sedimentation Calculation result, for along bank formula port development provide reliable reference according to
According to.
To achieve the goals above, the present invention is to realize by the following technical solutions：A kind of suitable bank formula basin silt
Siltation computation method, includes the following steps：
Step 1 is established along flow continuity equation and motion control equation in bank formula basin；
Step 2 is established along bank formula Sedimentation calculation formula；
Step 3 establishes trend numerical value sinks of the 30km × 20km along bank formula basin；
Step 4, analyzing different basin length-width ratio stream fields influences；
Step 5 establishes the variation relation for returning slot index n with flow along the ratio between bank formula basin length and width；
Step 6 determines that flow returns slot index n；
Step 7 is calculated based on step 2 and step 6 along bank formula basin sediment siltation thickness.
The invention has the advantages that：1, the present invention is it can be considered that " returning the effect of grooves " and different types " basin length and width
Than " with the variation relation of " flow returns slot index n ".It is counted with being deposited based on open type navigation channel (theory of silt Downward sedimentation) in the past
Calculation method is compared, and model method of the invention has clear principle, is readily appreciated that, using simple and efficient, high excellent of computational accuracy
Point.
2, the present invention provides one kind during along bank formula basin Sedimentation Calculation, analyzes special along bank formula basin flow
Property, basin length-width ratio stream field influences, along the ratio between bank formula basin length (l) and width (b) (i.e. " basin length-width ratio ") and flow
Return the method for the variation relation of slot index n.The variation relation that slot index n can be returned by " basin length-width ratio " and flow, determines
Under the conditions of basin centainly digs depth, for the suitable bank formula basin in different research marine sites, its optimal aspect is found out, is port engineering
Design provides reference frame.
Description of the drawings
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments；
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is that the flow of the suitable bank formula basin of the present invention forms schematic diagram；
In figure, Fig. 2 a are ebb tide process, Q0To enter tide amount, QeFor outflow tide amount, QLTo fall tidal prism, QyReturn for point bar
Slot flow tide amount；Fig. 2 b are flood tide process, QzFor the tidal prism that rises.
Fig. 3 is the suitable bank formula basin flow schematic diagram of the present invention；
In figure, hoFor the original depth of water of point bar, uoFor original flow velocity, h2For harbor basin water depth, u2For flow velocity in port, uiAnd ueRespectively
For the flow velocity of basin initial and end both ends boundary, qyEnter the Dan Kuanchao amounts of basin, q for point bar flowzFor fluctuation tidewater body tide amount.
Fig. 4 is that the numerical value sink of the present invention and basin arrange exemplary plot (for bank length 1000m)；
Fig. 5 is basin Its Adjacent Waters flow velocity isomers distribution example figure before and after the port basin of the present invention；
Fig. 6 is the exemplary relationship figure of suitable bank formula basin length-width ratio and the flow rate ratio (after excavation/naturally) of the present invention；
Fig. 7 is the exemplary relationship of the length-width ratio and index n of the suitable bank basin of the present invention.
Specific implementation mode
To make the technical means, the creative features, the aims and the efficiencies achieved by the present invention be easy to understand, with reference to
Specific implementation mode, the present invention is further explained.
- Fig. 7 referring to Fig.1, present embodiment use following technical scheme：Along bank formula port under a kind of archipelago marine environment
Pond Sedimentation Calculation method, includes the following steps：
One, it establishes along flow continuity equation and motion control equation in bank formula basin
1) basin section fluctuation tide flow equilibrium equation is established；
Referring to Fig. 2 tidal prism Q is on the one hand fallen during along bank formula basin ebb tideLBasin water is set to increase, another party
Face point bar flow returns slot to increase a part of flow Q againy, therefore can use following formula in the flow along section ebb tide outflow on bank direction
It indicates：Qe=Qo+QL+Qy；
It during flood tide, after trend enters basin, is on the one hand influenced by flood tide, water level increases, and the tidal prism that rises need to absorb one
Part tide amount (Qz), another aspect point bar flow returns slot to increase a part of water body (Qy), therefore going out along flood current on bank direction
Flow can be expressed from the next：Qe=Qo-Qz+Qy。
2) equal trend water sports governing equation when establishing；
By non-constant planar flow continuity equation, damp section is carried out to it according to integration method and is averaged, it is constant subject to improvement
The two dimension flow equation of motion is moved, it is as follows：
In above formula：hΔ- tidal range, u, v-are respectively x, y fast to dividing；H-the depth of water.
3) it establishes when considering to return the effect of grooves along bank formula basin water sports governing equation.
Consider water body when returning the effect of grooves, within the scope of the long l of basin to return slot water volume flow rate to be included in water movement in basin basic
In equation, referring to Fig. 3, and then flow velocity u in basin2Evolution with distance can be represented by the formula：
In above formula：uiAnd ueThe respectively flow velocity of basin initial and end both ends boundary.
Two, it establishes along bank formula Sedimentation calculation formula
1) balance silt content is introduced
In above formula：SpTo balance silt content；SoFor initial silt content；H is the depth of water；A, m-related coefficient, by associated basin
Experimental result determines.
2) on the basis of step 1, the suitable bank formula Sedimentation calculation formula for including " flow returns slot index n " is established.
Formula is as follows：
In above formula：ΔtFor the deposition thickness within the siltation time；T is the siltation time；α is sediment settlement rate；ρcFor siltation
Native dry density；ωsFor sediment settlement speed；M is balance silt content index；SoFor initial silt content；H0 is the initial depth of water；H2 is
The depth of water after excavation；N is that flow returns slot index, related with basin length-width ratio, by Step 3: Step 4: step 5 and step 6
It determines.
Three, trend numerical value sinks of the 30km × 20km along bank formula basin is established
The trend numerical value sink for initially setting up a 30km × 20km, referring to Fig. 4.The original depth of water of sink is set as 10m, will
Open boundary and the solid boundary of trend numerical value sink are separately positioned on different location according to actual conditions, are respectively set wherein opening boundary
In east, west both direction, Gu boundary is separately positioned on south, north both direction；The centre on the solid boundary in north is set in along bank formula basin
Position.
Two kinds of port basin depth of waters are set, digs be deep to 14m and 17m respectively.The port basin transverse slope gradient is 1:15, it indulges
It is 1 to grade of side slope:30 (by Practical Project --- for the practical excavation slope of Yang Shan deep water port basin).In order to investigate basin not
With excavate length-width ratio influence, by basin width b be 500m, basin length l be respectively set as 1000m, 2000m, 3000m,
4000m, 5000m, i.e. 5 kinds of length-width ratios.
Four, analyzing different basin length-width ratio stream fields influences
Based on step 3) interpretation of result difference port basin situation and different length-width ratio schemes before and after change in flow ginseng
Fig. 5 is examined, the port basin depth of water -17m (the former natural depth of water is -10m), basin length 4000m, for width is 500m are given
Change in flow situation.
Five, the variation relation for returning slot index n with flow along the ratio between bank formula basin length and width is established
Investigate along general impacts of the bank formula basin length-width ratio to flow velocity in port, be based on step 4) depict the front and back port of excavation
In pond mean flow rate ratio with different length-width ratios change curve.Referring to Fig. 6, opposite excavate than (excavating water for 1.7 is given
Deep/natural depth of water) suitable bank formula basin length-width ratio and flow rate ratio relationship, it is known that, under same excavation condition, when basin
After the ratio between length and width (l/b) reach a certain particular value, generally, there is flow velocity in basin compared with the flow velocity under native state
Increased, but with the increase of the ratio between basin length and width, the characteristics of flow velocity increase tendency is in gradually slowing down in basin.
Six, determine that flow returns slot index n.
Analysis based on step 4 and step 5, delineates under different excavation conditions, along bank formula basin length and width
The ratio between change procedure line with n values.Referring to Fig. 7, it is known that under the conditions of a certain opposite digging deep (or digging deep ratio), n is a variation
Value, and with the increase of the ratio between basin length and width, n values are in the trend reduced.
Seven, it is based on step 2 and step 6 is calculated along bank formula basin sediment siltation thickness.
Present embodiment analysis is influenced along bank formula basin flow characteristics, basin length-width ratio stream field, along bank formula basin
The method that the ratio between length and width (i.e. " basin length-width ratio ") return the variation relation of slot index n with flow.It can be by the way that " basin is long
Wide ratio " returns the variation relation of slot index n with flow, determines under the conditions of basin centainly digs depth, for the suitable of different research marine sites
Bank formula basin, finds out its optimal aspect, and reference frame is provided for port engineering design.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (7)
1. a kind of suitable bank formula basin Sedimentation Calculation method, which is characterized in that include the following steps：
Step 1 is established along flow continuity equation and motion control equation in bank formula basin；
Step 2 is established along bank formula Sedimentation calculation formula；
Step 3 establishes trend numerical value sinks of the 30km × 20km along bank formula basin；
Step 4, analyzing different basin length-width ratio stream fields influences；
Step 5 establishes the variation relation for returning slot index n with flow along the ratio between bank formula basin length and width；
Step 6 determines that flow returns slot index n；
Step 7 is calculated based on step 2 and step 6 along bank formula basin sediment siltation thickness.
2. a kind of suitable bank formula basin Sedimentation Calculation method according to claim 1, which is characterized in that the step
One includes following below scheme：(1) basin section fluctuation tide flow equilibrium equation is established；
During along bank formula basin ebb tide, tidal prism Q is on the one hand fallenLBasin water is set to increase, another aspect point bar flow returns slot
A part of flow Q is increased againy, therefore can be represented by the formula in the flow along section ebb tide outflow on bank direction：Qe=Qo+QL+
Qy；
It during flood tide, after trend enters basin, is on the one hand influenced by flood tide, water level increases, and the tidal prism that rises need to absorb a part
Tide amount Qz, another aspect point bar flow returns slot to increase a part of water body Qy, therefore the flow gone out along flood current on bank direction can be by
Following formula indicates：Qe=Qo-Qz+Qy；
(2) equal trend water sports governing equation when establishing；
By non-constant planar flow continuity equation, damp section is carried out to it according to integration method and is averaged, steady motion subject to improvement
The two dimension flow equation of motion, it is as follows：
In above formula：hΔ- tidal range, u, v-are respectively x, y fast to dividing；H-the depth of water；
(3) it establishes when considering to return the effect of grooves along bank formula basin water sports governing equation；
Consider water body when returning the effect of grooves, by within the scope of the long l of basin to return slot water volume flow rate to be included in water movement in basin substantially square
Cheng Zhong, and then flow velocity u in basin2Evolution with distance can be represented by the formula：
In above formula：uiAnd ueThe respectively flow velocity of basin initial and end both ends boundary.
3. a kind of suitable bank formula basin Sedimentation Calculation method according to claim 1, which is characterized in that the step
Two include following below scheme：(1) balance silt content is introduced：
In above formula：SpTo balance silt content；SoFor initial silt content；H is the depth of water；A, m-related coefficient, is tested by associated basin
As a result it determines；
(2) on the basis of step 1, the suitable bank formula Sedimentation calculation formula for including " flow returns slot index n ", formula are established
It is as follows：
In above formula：ΔtFor the deposition thickness within the siltation time；T is the siltation time；α is sediment settlement rate；ρcIt is dry for warp
Unit weight；ωsFor sediment settlement speed；M is balance silt content index；SoFor initial silt content；h0For the initial depth of water；h2To excavate
The depth of water afterwards；N is that flow returns slot index, related with basin length-width ratio, by Step 3: Step 4: step 5 and step 6 determine.
4. a kind of suitable bank formula basin Sedimentation Calculation method according to claim 1, which is characterized in that the step
Three：The trend numerical value sink of a 30km × 20km is initially set up,；The original depth of water of sink is set as 10m, by trend numerical value sink
Open boundary and solid boundary is separately positioned on different location according to actual conditions, wherein opening boundary is separately positioned on two, east, west
Direction, Gu boundary is separately positioned on south, north both direction；The centre position on the solid boundary in north is set in along bank formula basin；Setting two
The kind port basin depth of water digs be deep to 14m and 17m respectively；The port basin transverse slope gradient is 1:15, longitudinal grade of side slope is 1:
30；It is 500m by basin width b to investigate the influence that basin difference excavates length-width ratio, basin length l is respectively set as
1000m, 2000m, 3000m, 4000m, 5000m, i.e. 5 kinds of length-width ratios.
5. a kind of suitable bank formula basin Sedimentation Calculation method according to claim 1, which is characterized in that the step
Change in flow before and after the four interpretation of result difference port basin situations based on step 3 and different length-width ratio schemes, gives port
The depth of water -17m, basin length 4000m are excavated in pond, and width is the change in flow situation for 500m.
6. a kind of suitable bank formula basin Sedimentation Calculation method according to claim 1, which is characterized in that the step
Five investigate along general impacts of the bank formula basin length-width ratio to flow velocity in port, are depicted based on step 4 average in the front and back basin of excavation
Flow rate ratio with different length-width ratios (l/b) change curve；Give it is opposite excavate than for 1.7 suitable bank formula basin length-width ratio and
The relationship of flow rate ratio, it is known that, under same excavation condition, when length and the ratio between width (l/b) of basin reach a certain specific
After value, generally, flow velocity is increased compared with the flow velocity under native state in basin, but with the ratio between basin length and width
Increase, the characteristics of flow velocity increase tendency is in gradually slowing down in basin.
7. a kind of suitable bank formula basin Sedimentation Calculation method according to claim 1, which is characterized in that the step
Six analyses based on step 4 and step 5, delineate under different excavation conditions, along the ratio between bank formula basin length and width and n
The change procedure line of value；Understand that n is a changing value, and as basin is long under the conditions of a certain opposite digging is deep or digs ratio deeply
The increase of degree and the ratio between width, n values are in the trend reduced.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114595596A (en) * | 2022-05-07 | 2022-06-07 | 长江水利委员会水文局 | Simulation method of dense sedimentation rate of reservoir sediment |
-
2018
- 2018-04-23 CN CN201810365089.XA patent/CN108536987A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 赵洪波 等: "顺岸式码头港池的水流特点及淤积计算", 《中国港湾建设》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114595596A (en) * | 2022-05-07 | 2022-06-07 | 长江水利委员会水文局 | Simulation method of dense sedimentation rate of reservoir sediment |
| CN114595596B (en) * | 2022-05-07 | 2022-08-30 | 长江水利委员会水文局 | Simulation method of dense sedimentation rate of reservoir sediment |
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Application publication date: 20180914 |