CN103966974A - Arch dyke line of river confluence area, method for creating arch dyke line and application of arch dyke line - Google Patents
Arch dyke line of river confluence area, method for creating arch dyke line and application of arch dyke line Download PDFInfo
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Abstract
The invention discloses a method for creating an arch dyke line of a river confluence area. A conventional river confluence model is established and the lengths L, the widths b and the water depths h of a flow separation zone of the river confluence area are calculated under different confluence rates RQ through Fluent numerical simulation software, curve fitting is conducted, the relation between the lengths, the widths and the depths of the flow separation zone and the confluence rates RQ is created, testing arch dyke line river confluence models under the different confluence rates RQ are established, the water depths h' of the testing arch dyke line river confluence areas corresponding to the different confluence rates RQ are calculated, the relation between the water depth reduction rates (h'-h)/h and the confluence rates RQ is created, and according to the relation between the water depth reduction rates (h'-h)/h and the confluence rates RQ, the relation between L/Bm and the RQ and the relation between b/Bm and the RQ, the confluence rate enabling the water depth reduction rate to meet the actual engineering requirement and enabling the construction project amount to be minimum is selected to calculate the 1/4 ellipse arch dyke line satisfying the elliptic equation shown in the specification. The arch dyke line can be applied to the river confluence area with the confluence angle between the main river and the branch river being 90 degrees.
Description
Technical field
The invention belongs to river intersectional region flood wall and constructing technology field thereof, particularly the arc dike line of a kind of river intersectional region and construction process and application.
Background technology
China's water resource is abundant, and river is numerous, has formed the huge water systems that are much comprised of main flow and tributary, makes the river phenomenon ubiquity that crosses.Confluent river is due to himself particularity and complexity, as main tributary can produce backwater effect after crossing, current can produce jacking effect mutually, after crossing, also can produce Disengagement zone, Secondary Flow, water level and stop up highly, these all can produce larger impact to the river bed change of river course intersectional region, flood control and river course shipping etc.
As at river confluence reaches, due to the mutual backwater effect of two strands of current, the downstream crossing of being everlasting forms backflow Disengagement zone, as shown in Figure 1.The flow rate of water flow of backflow Disengagement zone is very little, and the backflow producing can change water flow structure, and these variations can affect the defeated of river material and move and river bed change, as pollutant in Disengagement zone because diffusion velocity reduction can cause being detained so that form contaminated area (band).In addition, the turbulent fluctuation blending effect producing after the current collision of confluence is strong, energy loss is very large, and the husky equilibrium state of the original water of main Zhi Heliu is broken, and can cause sand grain, especially coarse granule cobble deposits in Disengagement zone, form shoal, river mouth or beach, the middle of the river (continent), river course effective cross sectional area is reduced, not only affect shipping and flood discharge capacity, and river confluence reaches raise of stage, also will constitute a threat to flood wall line.Because the design of flood wall line is at present to inquire into according to the existing hydrological data in river, generally do not consider the impact of Disengagement zone on water level, this can cause undoubtedly under designed flood frequency, the actual flood level of intersection is higher than design flood level, flood can cover flood control embankment, and people's life and property are caused damage.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, first the construction process of the arc dike line of a kind of river intersectional region is provided.
Another object of the present invention is to provide the arc dike line of a kind of river intersectional region being built by said method, this arc dike line can dwindle or eliminate the Disengagement zone that crosses and produce due to river, thereby river intersectional region water level is reduced, flow velocity homogenising, and then prevent formation and the Sediment Siltation in contaminated area or contaminated zone, improve the flood control capacity of dike line.
A further object of the present invention is to provide a kind of application of the arc dike line of river intersectional region being built by said method.
The construction process of the arc dike line of river provided by the invention intersectional region, is characterized in that the construction step of the method is as follows:
(1) according to the river course parameter of actual river intersectional region, utilize Fluent numerical simulation software to set up conventional confluent channels model, in this model, the dike line of river intersectional region is that the confluent angle of conventional dike line, main tributary is 90 °;
(2) at least 5 differences, conflux and compare R
qunder condition, utilize Fluent numerical simulation software to calculate length L, width b and the intersectional region depth of water h of the current Disengagement zone of conventional river intersectional region, described in conflux and compare R
q=Q
m/ Q
b, wherein, Q
mand Q
bbe respectively main, tributary flow;
(3) the data obtained is carried out to Treatment Analysis (curve), the current Disengagement zone size of setting up conventional river intersectional region compares R with confluxing
qbetween relation;
L/B
m＝f(R
Q) (1)
b/B
m＝f(R
Q) (2)
Wherein, B
mfor main flow river width;
(4) test embankment line is made as arc, 1/4 ellipse that is shaped as that this tests arc dike line, meets elliptic equation
this test elliptic equation take main flow direction as x direction of principal axis, the flow path direction of take be y direction of principal axis, wherein, L is the length of current Disengagement zone, b is the width of current Disengagement zone, the starting point of the arc dike line of described test is the end points of major semiaxis L and the intersection point of tributary water front, the terminal of testing arc dike line is the end points of semi-minor axis b and the intersection point of main flow water front, and according to the river course parameter of actual river intersectional region, sets up difference and conflux and compare R
qunder the arc dike line of test confluent channels model, then utilize Fluent numerical simulation software to calculate respectively difference and conflux and compare R
qthe corresponding arc dike line of test intersectional region depth of water h ';
(5) first according to the depth of water h of the conventional river intersectional region calculating and the arc dike line intersectional region depth of water h ' of test, obtain depth of water reduced rate (h '-h)/h and compare R with confluxing
qrelation curve, then according to this relation curve and L/B
mand b/B
mwith R
qrelation select to make depth of water reduced rate to reach that Practical Project requires and the major semiaxis L as arc dike line than the current Disengagement zone length L value calculating that confluxes of construction works amount minimum
o, current Disengagement zone b value is as the semi-minor axis b of arc dike line
o.
Described in said method, conflux and compare R
qbe 0 < R
q≤ 1; If value is at least 5 differences and confluxes and compare R therein
q, R
qcan get respectively 0.2,0.4,0.6,0.8,1.0.
The parameter of river course described in said method is the width of main flow river course and a fluid stream channel.
The arc dike line of the river intersectional region being built by said method provided by the invention, this arc dike line be shaped as 1/4 ellipse.
1/4 ellipse of the arc dike line of above-mentioned river intersectional region meets elliptic equation
the starting point of arc dike line is major semiaxis L
oend points and the intersection point of tributary water front, the terminal of arc dike line is semi-minor axis b
oend points and the intersection point of main flow water front.
It is the application in the river intersectional region of 90 ° at the confluent angle in main flow and tributary that the present invention also provides the arc dike line of a kind of described river intersectional region.
The present invention has following beneficial effect:
1, the arc dike line of river intersectional region that the present invention builds, can reduce the to reflux size of Disengagement zone, the scope of greatly dwindling recirculating zone, is conducive to the diffusion of pollutant, can eliminate or avoid the formation of contaminated area (band), also for river intersectional region provides a kind of novel dike line.
2, the arc dike line of river intersectional region that the present invention builds, can reduce mutual backwater effect main, that two strands, tributary current produce, increases the effective cross sectional area in river course, section at intersectional region, water level reduces, and the navigation in river course and flood discharge capacity are strengthened, and improves the flood control capacity of dike line.
3, the arc dike line of river intersectional region that the present invention builds, can make the flow rate of water flow in Disengagement zone originally increase, water level raises, originally the flow rate of water flow in high velocity is reduced, water level reduces, thereby flow velocity, water level are distributed, be tending towards homogenising, avoided river to cross after the generation of regional area erosion and deposition phenomenon.
4, the construction process of arc dike line provided by the invention, has taken into full account flow feature and the Disengagement zone impact on water level when the main Zhi Lailiu difference in confluence, river is confluxed than combination, scientific and reasonable.
Accompanying drawing explanation
Fig. 1 is that the confluent angle of existing main tributary is the formed backflow of the conventional dike line Disengagement zone schematic diagram of 90 °.
Fig. 2 is that the present invention simulates the conventional dike line of the river region that crosses and tests the structural representation of arc dike line.
Fig. 3 is dimensionless Disengagement zone length L/B that the present invention builds
mwith R
qrelation curve.
Fig. 4 is the dimensionless separation zone width b/B that the present invention builds
mwith R
qrelation.
To be the nondimensionalization depth of water that builds of the present invention compare R with confluxing to Fig. 5
qrelation.
Fig. 6 compares R for adopting the present invention to test after arc dike line depth of water reduced rate with confluxing
qrelation curve.
Fig. 7 is existing conventional dike line Fluid field and Disengagement zone schematic diagram.
Fig. 8 is the present invention's arc dike line Fluid field and Disengagement zone schematic diagram.
The specific embodiment
Below in conjunction with accompanying drawing, the mode by concrete enforcement is that structure and application in the river intersectional region of 90 ° is described further to the arc dike line of river of the present invention intersectional region at the confluent angle in main flow and tributary.It is worth mentioning that, protection content of the present invention is not limited to following examples.
Embodiment
Because China river rises or the mountain area of flowing through mostly, some section in river or whole river are mountain stream, the mountain stream Hilly land of flowing through, and gradient is larger, and tributary distribution density is less, and river mouth, tributary is also just corresponding less.Table 1 has been added up the actual confluent angle situation of numerous mountain streams confluence main tributary of Sichuan Province and Chongqing City.As can be seen from Table 1, the confluent angle major part of existing confluent channels is all 90 °.
The main Zhi Heliu confluent angle statistics of table 1
| Main flow | Tributary | Confluent angle | Main flow | Tributary | Confluent angle |
| The Changjiang river | Jia Lingjiang River | 90° | Jia Lingjiang River | Fujiang River | 90° |
| The Changjiang river | The Wujiang River | 90° | Ming River | Dadu River | 90° |
| The Changjiang river | Tuo Jiang | 30～40° | Jinsha jiang River | Ming River | 90° |
| Jia Lingjiang River | East River | 70° | Dadu River | Qingyi River | 90° |
| Jia Lingjiang River | Canal river | 110° | Lve Yanghe | White Dragon River | 90° |
(1) statistics based on table 1, according to the river course parameter of actual river intersectional region, utilizes Fluent numerical simulation software to set up the conventional confluent channels model of simulation and the river that crosses of simulation is carried out to grid division.The river course parameter of the actual river intersectional region of choosing in the present embodiment is: the length * width=1000m*80m of main flow, the length * width=300m*50m in tributary, the confluent angle in main flow and tributary is 90 °.The dike line of the river intersectional region of simulating in this model is conventional dike line, and the structure of the confluent angle in the river that crosses and conventional dike line as shown in Figure 2.
(2) utilize Fluent numerical simulation software calculating difference to conflux and compare R
q=Q
m/ Q
b(Q
m, Q
bbe respectively main tributary flow) length L and width b, the depth of water h of intersectional region current Disengagement zone, conventional river under condition.During calculating, outlet is made as to free discharge, and initial flow rate field is made as 0, and border is without slippage border, import border is by the given main flow of table 2 and tributary flow and resulting confluxing than 0.21,0.31,0.42,0.50,0.63,0.83 and 1.04, calculates difference and confluxes and compare R
qthe length L of lower current Disengagement zone, width b and depth of water h, the results are shown in Table 2.
Table 2
| R Q | Main flow flow (m 3/s) | Tributary flow (m 3/s) | b(m) | L(m) | h(m) | h’(m) |
| 0.21 | 240 | 50 | 8 | 100 | 1.07 | 1.01 |
| 0.31 | 240 | 75 | 12 | 135 | 1.12 | 1.02 |
| 0.42 | 240 | 100 | 15 | 142 | 1.08 | 1.00 |
| 0.50 | 200 | 100 | 18 | 168 | 1.18 | 0.96 |
| 0.63 | 120 | 75 | 22 | 201 | 1.23 | 0.92 |
| 0.83 | 120 | 100 | 25 | 217 | 1.26 | 0.97 |
| 1.04 | 120 | 125 | 30 | 275 | 1.35 | 0.98 |
(3) first the length L of the current Disengagement zone of gained in table 2 and width b are carried out respectively to nondimensionalization, obtain dimensionless Disengagement zone length L/B
mwith dimensionless separation zone width b/B
m, wherein, B
mfor main flow river width, unit is m, then by curve, obtains respectively L/B
mand b/B
mwith R
qrelation is as follows:
L/B
m＝-0.259R
Q 2+2.794R
Q+0.74 (1)
b/B
m＝-0.170R
Q 2+0.534R
Q-0.002 (2)
Also be the shown dimensionless Disengagement zone length L/B of Fig. 3 and Fig. 4
m, width b/B
mrespectively with R
qrelation curve can be found out from Fig. 3, Fig. 4, along with conflux than increase, Disengagement zone length and width are regular increase.
(4) test embankment line is made as arc, 1/4 ellipse that is shaped as that this tests arc dike line, meets elliptic equation
this test elliptic equation take main flow direction as x direction of principal axis, the flow path direction of take be y direction of principal axis, wherein, L is the length of current Disengagement zone, b is the width of current Disengagement zone, the starting point of the arc dike line of described test is the end points of major semiaxis L and the intersection point of tributary water front, the terminal of testing arc dike line is the end points of semi-minor axis b and the intersection point of main flow water front, and according to the river course parameter of actual river intersectional region, sets up difference and conflux and compare R
qunder the arc dike line of test confluent channels model, then utilize Fluent numerical simulation software to calculate respectively difference and conflux and compare R
qthe corresponding arc dike line of test intersectional region depth of water h ', the results are shown in Table 2.
(5) with main flow admission section depth of water h
mby conventional dike line and test depth of water h and the h ' nondimensionalization under arc dike line, the nondimensionalization depth of water that obtains conventional dike line and test arc dike line compares R with confluxing
qrelation curve, as shown in Figure 5.As seen from Figure 5, identical, conflux than in situation, adopt after the arc dike line of test, the depth of water all decreases.Adopt after the arc dike line of test, depth of water reduced rate (h '-h)/h compares R with confluxing
qrelation curve as shown in Figure 6, as can be seen from Figure 6, when confluxing when being 0.5～0.83, depth of water reduced rate approaches 20%, along with confluxing than increase, depth of water reduced rate is substantially constant, but works as R
qduring >1, depth of water reduced rate increases gradually, but R
qthe probability that the situation of >1 occurs in actual river course is less, and known according to formula (1) and formula (2), confluxes than less, and L and b are less, and construction works amount is less, so by R
q=0.5 is decided to be the calculating parameter of determining final arc dike line, then the current Disengagement zone length obtaining according to formula (1) and formula (2) and width are as major semiaxis and the semi-minor axis of final arc water front, final major semiaxis L
o=168m, semi-minor axis b
o=18m.
The final arc dike line being obtained by above-mentioned computational process be shaped as 1/4 ellipse, meet elliptic equation
this elliptic equation take main flow direction as x direction of principal axis, the flow path direction of take be y direction of principal axis, the starting point of described arc dike line is major semiaxis L
oend points and the intersection point of tributary water front, the terminal of arc dike line is semi-minor axis b
oend points and the intersection point of main flow water front, as shown in Figure 8.
Flow field under conventional dike line and arc dike line and the distribution schematic diagram of Disengagement zone are respectively as shown in Figures 7 and 8, from Fig. 7, Fig. 8 relatively, adopt after arc dike line, the scope of Disengagement zone is reduced or is eliminated, and flow velocity homogenising, there is not high velocity and low regime; Confluence backwater effect reduces, and effectively the cross-section of river increases.
Claims (6)
1. a construction process for the arc dike line of river intersectional region, is characterized in that the construction step of the method is as follows:
(1) according to the river course parameter of actual river intersectional region, utilize Fluent numerical simulation software to set up conventional confluent channels model, in this model, the dike line of river intersectional region is that the confluent angle of conventional dike line, main tributary is 90 °;
(2) at least 5 differences, conflux and compare R
qunder condition, utilize Fluent numerical simulation software to calculate length L, width b and the intersectional region depth of water h of the current Disengagement zone of conventional river intersectional region, described in conflux and compare R
q=Q
m/ Q
b, wherein, Q
mand Q
bbe respectively main, tributary flow;
(3) the data obtained is carried out to Treatment Analysis, the current Disengagement zone size of setting up conventional river intersectional region compares R with confluxing
qbetween relation;
L/B
m＝f(R
Q) (1)
b/B
m＝f(R
Q) (2)
Wherein, B
mfor main flow river width;
(4) test embankment line is made as arc, 1/4 ellipse that is shaped as that this tests arc dike line, meets elliptic equation
this test elliptic equation take main flow direction as x direction of principal axis, the flow path direction of take be y direction of principal axis, wherein, L is the length of current Disengagement zone, b is the width of current Disengagement zone, the starting point of the arc dike line of described test is the end points of major semiaxis L and the intersection point of tributary water front, the terminal of testing arc dike line is the end points of semi-minor axis b and the intersection point of main flow water front, and according to the river course parameter of actual river intersectional region, sets up difference and conflux and compare R
qunder the arc dike line of test confluent channels model, then utilize Fluent numerical simulation software to calculate respectively difference and conflux and compare R
qthe corresponding arc dike line of test intersectional region depth of water h ';
(5) first according to the depth of water h of the conventional river intersectional region calculating and the arc dike line intersectional region depth of water h ' of test, obtain depth of water reduced rate (h '-h)/h and compare R with confluxing
qrelation curve, then according to this relation curve and L/B
mand b/B
mwith R
qrelation select to make depth of water reduced rate to reach that Practical Project requires and the major semiaxis L as arc dike line than the current Disengagement zone length L value calculating that confluxes of construction works amount minimum
o, current Disengagement zone b value is as the semi-minor axis b of arc dike line
o.
2. the construction process of the arc dike line of river according to claim 1 intersectional region, is characterized in that confluxing and comparing R described in the method
qbe 0 < R
q≤ 1.
3. the construction process of the arc dike line of river according to claim 1 and 2 intersectional region, is characterized in that the parameter of river course described in the method is the width of main flow river course and a fluid stream channel.
4. by the arc dike line of river intersectional region of method structure described in claim 1, it is characterized in that 1/4 ellipse that is shaped as of this arc dike line.
5. the arc dike line of river intersectional region according to claim 4, is characterized in that described 1/4 ellipse meets elliptic equation
the starting point of arc dike line is major semiaxis L
oend points and the intersection point of tributary water front, the terminal of arc dike line is semi-minor axis b
oend points and the intersection point of main flow water front.
6. according to the arc dike line of river intersectional region described in claim 4 or 5, at the confluent angle in main flow and tributary, be the application in the river intersectional region of 90 °.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109371913A (en) * | 2018-12-04 | 2019-02-22 | 黄子 | Inhibit the channel and its design method of water flow unstability and roll wave |
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2014
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