CN108898256A - Muddy Bottoms tidal estuary promotees silt engineering siltation effect forecasting procedure - Google Patents
Muddy Bottoms tidal estuary promotees silt engineering siltation effect forecasting procedure Download PDFInfo
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Abstract
Muddy Bottoms tidal estuary disclosed by the invention promotees silt engineering siltation effect forecasting procedure, includes the following steps：1) it establishes comprising Project Areas inside and the enough Two Dimensional Tidal Current mathematical models of range and solves, calculate analysis and promote to promote silt engineering effect of depositing with the hydrodynamic condition that promotees Engineering Zone after silt engineering for forecast and hydrodynamic parameter is provided before silt engineering；2) basic prediction formula is selected according to case history verifying；3) rationalization amendment is carried out to basic prediction formula according to requirement of engineering, is modified to the prediction formula at times and total deposition thickness prediction formula for increasing time coefficient；4) assignment method of the key parameter in revised prediction formula is proposed；5) it according to revised prediction formula and step 4 to key parameter assignment method, forecasts and promotees the deposition thickness plane distribution and total deposition thickness plane distribution of silt engineering at times in the rush silt phase.
Description
Technical field
The present invention relates to promote silt engineering research technical field more particularly to a kind of rush silt engineering siltation of Muddy Bottoms tidal estuary
Effect forecasting procedure.
Background technique
Promoting silt engineering is a kind of important estuary coast engineering, relatively accurately forecasts that its effect of depositing is to promote silt engineering to build
If early period needs the major issue solved.Half theoretical semiempirical formula method of prediction is often the country because the period is short, operation relative ease
Outer engineer uses.But due to the complexity of sediment movement, the especially region of Muddy Bottoms tidal estuary, different formulas forecast knot
Fruit can have larger difference, need reasonable selection and correct.
Summary of the invention
The technical problem to be solved by the present invention is to：Complexity and different formulas forecast result for sediment movement exist
The problems such as biggish otherness, and a kind of Muddy Bottoms tidal estuary rush silt engineering siltation effect forecasting procedure is provided.
The technical problems to be solved by the invention can adopt the following technical scheme that realization：
Muddy Bottoms tidal estuary promotees silt engineering siltation effect forecasting procedure, includes the following steps：
Step 1, it establishes engineering front and back Two Dimensional Tidal Current mathematical model and solves：
It establishes comprising Project Areas inside and the enough Two Dimensional Tidal Current mathematical models of range and solves, calculate analysis and promote silt engineering
The hydrodynamic condition of Engineering Zone after the preceding silt engineering construction with rush of implementation, provides hydrodynamic force ginseng for forecast rush silt engineering siltation effect
Number；
Step 2, basic prediction formula is selected according to case history verifying：
Domestic existing multiple prediction formulas are verified using typical engineering examples, selects and the rush of locality is suitble to become silted up
The basic prediction formula of effect, promoting the basic prediction formula of silt effect is：
Wherein, H1、H2The depth of water respectively under engineering forward backward averaging tidal level, S1、S2Silt content respectively before and after engineering,
q1、q2Dan Kuanchao amount respectively before and after engineering；
Step 3, rationalization amendment is carried out to basic prediction formula according to requirement of engineering：
According to the needs for promoting silt engineering prediction, increase time coefficient in promoting the basic prediction formula of silt effect, by formula (1)
It is modified to and promotees deposit at times in the silt phase prediction formula and total deposition thickness prediction formula：
Wherein, PiFor the deposition thickness of the i-th period；KiFor the accounting coefficient that back-silts of the i-th period, ∑ Ki=1；PAlwaysTo promote to become silted up
Total deposition thickness in phase；
Step 4, the assignment method of the key parameter in amendment prediction formula is proposed：
Key parameter involved in formula (2) and formula (3) includes S1、S2、q1、q2、H1、Ki, wherein S1、S2It should be according to reality
Survey data value is calculated using empirical equation, is believed that S according to Muddy Bottoms tidal estuary engineering experience1=S2；q1、q2
To promote the complete average discharge per unit width of tide before and after silt engineering, it is calculated by step (1)；H1Promote actual measurement landform before becoming silted up by the area Cu Yu to calculate
It obtains；KiValue should be obtained according to local field data inverting, according to Muddy Bottoms tidal estuary case history experience, be divided into 4
A period, respectively rush silt project subject structure formed before, main structure formed after the 1st year, main structure formed after the 2nd year and
4 periods after main structure is formed 2 years, and value is 0.1,0.5,0.3,0.1 respectively；
Step 5, forecast promote silt engineering promote in the silt phase at times and total deposition thickness plane distribution：
With prediction formula and total deposition thickness prediction formula at times in the rush silt phase revised in step 3, and according to
Step 4 forecasts to key parameter assignment method and promotees the deposition thickness plane distribution and total silt of silt engineering for promoting silt phase at times
Product thickness plane distribution.
Due to using the technology described above, the present invention can forecast that Muddy Bottoms tidal estuary promotees silt engineering and becomes silted up more conveniently
Product effect, and have the advantages that following：
(1) present invention solves the problems, such as that Muddy Bottoms tidal estuary promotees silt effect prediction formula and selects, due to sediment movement
Complexity and each region topography and geomorphology and hydrodynamic condition otherness, domestic existing more prediction formulas application model at present
It encloses and applicable elements is widely different, the same area can have larger difference using different prediction formula results.The present invention is through length
The verifying of the multiple case histories in Jiangkou is recommended in Muddy Bottoms tidal estuary and is simplified based on sinus state benevolence riverbed equilibrium morphological relationship formula
And the estuarine hydraulic geometry formula come has practical value as basic prediction formula.
(2) present invention solves the problems, such as that Muddy Bottoms tidal estuary promotees silt effect and forecasts at times.Due to existing river mouth
River facies relation formula is unable to satisfy without time factor and promotees the demand that silt engineering siltation effect is forecast at times.The present invention, which corrects, to be proposed
Prediction formula at times, and the assignment method of key parameter is given, especially given through entrance of Changjiang River field data inverting
The recommendation value of the accounting coefficient that back-silts of different periods, greatly facilitates popularization and application of the invention.
Detailed description of the invention
Fig. 1 is flow diagram of the invention.
Fig. 2 is the case position that the present invention applies.
Fig. 3 is the schematic diagram of Two Dimensional Tidal Current mathematical model computer capacity and underwater topography.
Fig. 4 is the schematic diagram that the main structure that the present invention is forecast forms rear 1st year deposition thickness distribution.
Fig. 5 is the schematic diagram for promoting total deposition thickness distribution in the silt phase that the present invention is forecast.
Fig. 6 is the schematic diagram that the main structure of actual measurement forms rear 1st year deposition thickness distribution.
Fig. 7 is the schematic diagram of deposition thickness distribution total (after going into operation in 4 years) in the rush silt phase of actual measurement.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawing：
Referring to Fig. 1, provided in figure be Muddy Bottoms tidal estuary promote silt engineering siltation effect forecasting procedure, specifically include with
Lower step：
Step 1, it establishes engineering front and back Two Dimensional Tidal Current mathematical model and solves：
It establishes comprising Project Areas inside and the enough Two Dimensional Tidal Current mathematical models of range and solves, calculate analysis and promote silt engineering
The hydrodynamic condition of Engineering Zone after the preceding silt engineering construction with rush of implementation, provides hydrodynamic force ginseng for forecast rush silt engineering siltation effect
Number.
Step 2, basic prediction formula is selected according to case history verifying：
Domestic existing multiple prediction formulas are verified using typical engineering examples, selects and the rush of locality is suitble to become silted up
The basic prediction formula of effect is recommended to be based on sinus state for Muddy Bottoms tidal estuary by the verifying of the multiple case histories in entrance of Changjiang River
The estuarine hydraulic geometry formula that benevolence riverbed equilibrium morphological relationship formula is simplified and comes is as the basic prediction formula of silt effect is promoted：
Wherein, H1、H2The depth of water respectively under engineering forward backward averaging tidal level, S1、S2Silt content respectively before and after engineering,
q1、q2Dan Kuanchao amount respectively before and after engineering.
Step 3, rationalization amendment is carried out to basic prediction formula according to requirement of engineering：
Because formula (1) is without time factor, can not forecast to promote the rush silt effect after silt engineering construction at times.According to rush silt work
The needs of journey forecast, increase time coefficient in promoting the basic prediction formula of silt effect, and formula (1) is modified to and promotees timesharing in the silt phase
Section siltation prediction formula and total deposition thickness prediction formula：
Wherein, PiFor the deposition thickness of the i-th period；KiFor the accounting coefficient that back-silts of the i-th period, ∑ K1=1；PAlwaysTo promote to become silted up
Total deposition thickness in phase.
Step 4, the assignment method of the key parameter in amendment prediction formula is proposed：
Key parameter involved in formula (2) and formula (3) includes S1、S2、q1、q2、H1、Ki, wherein S1、S2It should be according to reality
Survey data value is calculated using empirical equation, is believed that S according to Muddy Bottoms tidal estuary engineering experience1=S2；q1、q2
To promote the complete average discharge per unit width of tide before and after silt engineering, it is calculated by step (1)；H1Promote actual measurement landform before becoming silted up by the area Cu Yu to calculate
It obtains；KiValue should be obtained according to local field data inverting, according to Muddy Bottoms tidal estuary case history experience, be divided into 4
A period, respectively rush silt project subject structure formed before, main structure formed after the 1st year, main structure formed after the 2nd year and
4 periods after main structure is formed 2 years, and value is 0.1,0.5,0.3,0.1 respectively；
Step 5, forecast promote silt engineering promote in the silt phase at times and total deposition thickness plane distribution：
With prediction formula and total deposition thickness prediction formula at times in the rush silt phase revised in step 3, and according to
Step 4 forecasts to key parameter assignment method and promotees the deposition thickness plane distribution and total silt of silt engineering for promoting silt phase at times
Product thickness plane distribution.
Promoting silt engineering below for Nanhui eastern mudflat beach --- rush one phase of silt controls greatly siltation effect in the area Cu Yu to the north of river
Forecast carries out concrete analysis explanation to the method for the present invention, and application site is as shown in Figure 1.
Muddy Bottoms tidal estuary of the invention promotees silt engineering siltation effect forecasting procedure, includes the following steps：
Step 1, it establishes comprising the entrance of Changjiang River Hangzhou Wan entirety Two Dimensional Tidal Current mathematical model including the range of Project Areas, such as Fig. 2
It is shown, suitable calculating hydrologic condition is selected, calculates separately before simulating rush silt engineering construction with the hydrodynamic condition after implementation, is
Forecast promotees silt engineering siltation effect and provides hydrodynamic parameter.
Step 2, basic prediction formula is selected according to case history verifying, as shown in above-mentioned formula (1).
Step 3, rationalization amendment is carried out to basic prediction formula according to requirement of engineering, be modified to prediction formula at times and
Total deposition thickness prediction formula, as shown in above-mentioned formula (2) and formula (3).
Step 4, the assignment method of the key parameter in revised prediction formula is proposed, whereinTake 1；q1、q2It takes respectively
What step 1 was calculated promotees the average discharge per unit width of full tide before and after silt engineering；H1Promote actual measurement landform before becoming silted up by the area Cu Yu to calculate
It arrives；KiPromote silt project subject structure formed before, main structure formed after the 1st year, main structure formed after the 2nd year, main body knot
4 periods after being configured to 2 years distinguish value 0.1,0.5,0.3,0.1.
Step 5, analysis is calculated, according to formula (2) and formula (3) and step 4 to key parameter assignment method, forecasts rush
Silt engineering is promoting deposition thickness plane distribution and total deposition thickness plane distribution in the silt phase at times.Referring to Fig. 3 to Fig. 6,
Fig. 3 is the schematic diagram that the main structure that the present invention is forecast forms rear 1st year deposition thickness distribution, and Fig. 4 is the rush that the present invention is forecast
The schematic diagram of total deposition thickness distribution in the silt phase, Fig. 5 are the signal that the main structure of actual measurement forms rear 1st year deposition thickness distribution
Figure, Fig. 6 are the schematic diagram of deposition thickness distribution total (after going into operation in 4 years) in the rush silt phase of actual measurement, comparison diagram 3 and Fig. 5 and Fig. 4
With Fig. 6, forecast result and measured result more coincide.
Claims (1)
1. Muddy Bottoms tidal estuary promotees silt engineering siltation effect forecasting procedure, which is characterized in that include the following steps：
Step 1, it establishes engineering front and back Two Dimensional Tidal Current mathematical model and solves：
It establishes comprising Project Areas inside and the enough Two Dimensional Tidal Current mathematical models of range and solves, calculate analysis and promote silt engineering construction
The hydrodynamic condition of Engineering Zone after the preceding silt engineering construction with rush, promotees silt engineering siltation effect for forecast and provides hydrodynamic parameter；
Step 2, basic prediction formula is selected according to case history verifying：
Domestic existing multiple prediction formulas are verified using typical engineering examples, select the rush silt effect for being suitble to locality
Basic prediction formula, promoting the basic prediction formula of silt effect is：
Wherein, H1、H2The depth of water respectively under engineering forward backward averaging tidal level, S1、S2Silt content respectively before and after engineering, q1、q2
Dan Kuanchao amount respectively before and after engineering；
Step 3, rationalization amendment is carried out to basic prediction formula according to requirement of engineering：
According to the needs for promoting silt engineering prediction, increase time coefficient in promoting the basic prediction formula of silt effect, formula (1) is corrected
To promote deposit at times in the silt phase prediction formula and total deposition thickness prediction formula：
Wherein, PiFor the deposition thickness of the i-th period；KiFor the accounting coefficient that back-silts of the i-th period, ∑ Ki=1；PAlwaysTo promote in the silt phase
Total deposition thickness；
Step 4, the assignment method of the key parameter in amendment prediction formula is proposed：
Key parameter involved in formula (2) and formula (3) includes S1、S2、q1、q2、H1、Ki, wherein S1、S2It should be provided according to actual measurement
Material value is calculated using empirical equation, is believed that S according to Muddy Bottoms tidal estuary engineering experience1=S2；q1、q2To promote
The complete average discharge per unit width of tide, is calculated by step (1) before and after silt engineering；H1Promote actual measurement landform before becoming silted up by the area Cu Yu to calculate
It arrives；KiValue should be obtained according to local field data inverting, according to Muddy Bottoms tidal estuary case history experience, be divided into 4
Period, respectively rush silt project subject structure formed before, main structure formed after the 1st year, main structure formed after the 2nd year and main
4 periods after body structure is formed 2 years, and value is 0.1,0.5,0.3,0.1 respectively；
Step 5, forecast promote silt engineering promote in the silt phase at times and total deposition thickness plane distribution：
With prediction formula and total deposition thickness prediction formula at times in the rush silt phase revised in step 3, and according to step 4
To key parameter assignment method, the deposition thickness plane distribution promoted the silt engineering for promoting silt phase at times and total deposition thickness are forecast
Plane distribution.
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