CN109886537A - A kind of judgment method of the road waterlogging risk of town site expansion - Google Patents
A kind of judgment method of the road waterlogging risk of town site expansion Download PDFInfo
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Abstract
A kind of judgment method of the road waterlogging risk of town site expansion, comprising: calculate the exceeded Rainfall runoff of planning region after land character variation；Calculate the low-lying road horizontal slope minimum point depth of accumulated water of planning region；In conjunction with the constraint condition for not influencing traffic safety, judge whether the increase of comprehensive runoff coefficient can bring waterlogging risk, and road traffic is caused to be paralysed.Method of the invention is simple, conveniently, it is practical.Promotional value of the invention is when carrying out urban planning, it can be according to the land character Adjusted Option of section in planning region, examine whether land character Adjusted Option can bring waterlogging risk, planner is helped just to prevent urban waterlogging from the angle of traffic safety in the adjustment land character stage, and then formed in terms of a kind of road drainage to the feedback mechanism in terms of urban planning, it controls town site and rationally expands.
Description
Technical field
The present invention relates to a kind of judgment methods of urban road drainage prevention waterlogging risk, use more particularly to a kind of urban construction
The judgment method of the road waterlogging risk of ground expansion.
Background technique
Urban population, which is constantly assembled, causes the area of town site constantly to increase, urban planning and construction land sprawl at
For normality, but the mating of city planting ductwork more difficult increases the synchronous progress of construction land with city newly.The increase of construction land leads to rainwater
Run-off exceeds Storm Sewer System adaptibility to response, so that the exceeded rainwater that cannot be excluded in time by storm-water system is formed, it is exceeded
Rainwater can downstream low-lying road collects along road surface or depression, causes urban road traffic safety hidden danger.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of sentencing for the road waterlogging risk of town site expansion
Disconnected method.
The technical scheme adopted by the invention is that: a kind of judgement side of the road waterlogging risk of town site expansion
Method includes the following steps:
1) the exceeded Rainfall runoff of planning region after land character changes is calculated；
2) the low-lying road horizontal slope minimum point depth of accumulated water of planning region is calculated；
3) constraint condition for not influencing traffic safety is combined, judges whether the increase of comprehensive runoff coefficient can bring waterlogging wind
Danger, and road traffic is caused to be paralysed.
Step 1) be planning region is divided into it is N number of be less than a km2Section, each section using push pull azobenzene compounds calculate
Rainfall runoff:
Qn=qn×Ψn×Sn
In formula: QnIndicate the Rainfall runoff of the n-th section, unit: L/s；qnIndicate the design storm intensity of the n-th section, it is single
Position: L/ (shm2)；ΨnIndicate the synthesis runoff coefficient before the land character variation of the n-th section；SnIndicate the remittance of the n-th section
Water area, unit: hm2；
After land character variation, Storm Sewer System is constant, comprehensive runoff coefficient ΨnBecome Ψn', then
Qn'=qn×Ψn'×Sn
In formula: Qn' indicate Rainfall runoff after the variation of the n-th section land character under design storm intensity, unit: L/s；
Ψn' indicate the n-th section land character variation after synthesis runoff coefficient；
Work as Ψn'>ΨnWhen, Qn' > Qn, Rainfall runoff that road need to exclude is greater than Storm Sewer System ability, has product on road
Water simultaneously forms longitudinal runoff；I.e. when storm intensity reaches the design storm intensity q of Storm Sewer System in planning regionnWhen,
The exceeded Rainfall runoff Δ Q of n-th sectionnFor
ΔQn=Qn'-Qn=qn×(Ψn'-Ψn)×Sn
Accumulate the low-lying road of planning region exceeded Rainfall runoff Δ Q be N number of section exceeded Rainfall runoff it
With then
Step 2) sets the stormwater facility of low-lying road in bituminous pavement two sides first, road axis two sides or in divide band
Two sides equivalent ponding；Low-lying road half range bituminous pavement width is w1, half breadth w of red line2, amount of crown h；α is low-lying road
The gradient of horizontal slope；Low-lying link length is L, and rainfall duration t, low-lying road horizontal slope minimum point depth of accumulated water is x, surface gathered water
Width is f, and kerbstone exposed height is s；As x < s, f < w1；As x > s, f > w1；
When low-lying the forms of road cross section is single carriageway road, the mathematic(al) representation of low-lying road ponding volume are as follows:
It is derived from low-lying road horizontal slope minimum point depth of accumulated water x are as follows:
In formula, Δ Q indicates the exceeded Rainfall runoff of the low-lying road of planning region.
The constraint condition for influencing traffic safety is set not in step 3) are as follows: do not influence walking and cyclists only safety ponding
Depth is H1, the depth of accumulated water for not influencing autos only safety is H2；Choose H1And H2In high level as judging depth of accumulated water
Whether the threshold value H of traffic safety is influenced, i.e.,
In the increased situation of synthesis runoff coefficient for the section that land character adjusts in planning region, design storm is judged
Whether the low-lying road link depth of accumulated water under intensity, which can impact low-lying road link traffic, even results in traffic paralysis,
Wherein, logic judgment value is set as j,
In formula, x indicates low-lying road horizontal slope minimum point depth of accumulated water in planning region；
As j=0, the synthesis runoff coefficient Ψ of the n-th section in planning regionnIncrease will not affect traffic safety
Waterlogging risk；As j=1, the synthesis runoff coefficient Ψ of the n-th section in planning regionnIncrease can affect traffic safety
Waterlogging risk then suggests that regulatory authorities modify land use planning, or Regeneration planning area while adjusting land character
Storm-water system in domain.
The present invention is a kind of judgment method of the road waterlogging risk of town site expansion, can be obtained according to some
Parameter obtains the depth of accumulated water of low-lying road horizontal slope minimum point in planning region, and judge from the angle of traffic safety low-lying
Whether road ponding brings waterlogging risk.Method of the invention is simple, conveniently, it is practical.Promotional value of the invention is to carry out
When urban planning, whether land character Adjusted Option can be examined according to the land character Adjusted Option of section in planning region
Waterlogging risk can be brought, planner is helped just to prevent urban waterlogging from the angle of traffic safety in the adjustment land character stage, into
And formed in terms of a kind of road drainage to the feedback mechanism in terms of urban planning, it controls town site and rationally expands.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the judgment method of the road waterlogging risk of town site expansion of the present invention；
Fig. 2 is that single carriageway road cross dimension element is illustrated in the present invention.
Specific embodiment
Below with reference to embodiment and attached drawing sentencing to the road waterlogging risk of town site expansion of the invention a kind of
Disconnected method is described in detail.
As shown in Figure 1, the judgment method for the road waterlogging risk that a kind of town site of the invention is expanded, including such as
Lower step:
1) the exceeded Rainfall runoff of planning region after land character changes is calculated；Planning region is specifically divided into N
It is a to be less than akm2Section, each section using push pull azobenzene compounds calculate Rainfall runoff:
Qn=qn×Ψn×Sn
In formula: QnIndicate the Rainfall runoff of the n-th section, unit: L/s；qnIndicate the design storm intensity of the n-th section, it is single
Position: L/ (shm2)；ΨnIndicate the synthesis runoff coefficient before the land character variation of the n-th section；SnIndicate the remittance of the n-th section
Water area, unit: hm2；
After land character variation, Storm Sewer System is constant, comprehensive runoff coefficient ΨnBecome Ψn', then
Qn'=qn×Ψn'×Sn
In formula: Qn' indicate Rainfall runoff after the variation of the n-th section land character under design storm intensity, unit: L/s；
Ψn' indicate the n-th section land character variation after synthesis runoff coefficient；
Work as Ψn'>ΨnWhen, Qn' > Qn, Rainfall runoff that road need to exclude is greater than Storm Sewer System ability, has product on road
Water simultaneously forms longitudinal runoff；I.e. when storm intensity reaches the design storm intensity q of Storm Sewer System in planning regionnWhen,
The exceeded Rainfall runoff Δ Q of n-th sectionnFor
ΔQn=Qn'-Qn=qn×(Ψn'-Ψn)×Sn
Accumulate the low-lying road of planning region exceeded Rainfall runoff Δ Q be N number of section exceeded Rainfall runoff it
With then
3.2) the low-lying road horizontal slope minimum point depth of accumulated water of planning region is calculated；The stormwater facility of low-lying road is set first
In bituminous pavement two sides, road axis two sides or in point band two sides equivalent ponding；As shown in Fig. 2, low-lying road half range pitch
Width of roadway is w1, half breadth w of red line2, amount of crown h；α is the gradient of low-lying road horizontal slope；Low-lying link length is L, drop
Rain is lasted for t, and low-lying road horizontal slope minimum point depth of accumulated water is x, and surface gathered water width is f, and kerbstone exposed height is s；As x < s
When, f < w1；As x > s, f > w1；
When low-lying the forms of road cross section is single carriageway road, the mathematic(al) representation of low-lying road ponding volume are as follows:
It is derived from low-lying road horizontal slope minimum point depth of accumulated water x are as follows:
In formula, Δ Q indicates the exceeded Rainfall runoff of the low-lying road of planning region.
3) constraint condition for not influencing traffic safety is combined, judges whether the increase of comprehensive runoff coefficient can bring waterlogging wind
Danger, and road traffic is caused to be paralysed.Consider that city inside road is mainly passenger traffic, be mainly the people of walking, bicycle,
Minibus and motor bus, when depth of accumulated water is more than certain value, pedestrian or bicycle or minibus or motor bus passage will have peace
Full hidden danger is even impassable.
If not influencing the constraint condition of traffic safety are as follows: not influencing walking, safe depth of accumulated water is with cyclists only
H1, the depth of accumulated water for not influencing autos only safety is H2；Choose H1And H2In high level as judge depth of accumulated water whether shadow
The threshold value H of traffic safety is rung, i.e.,
In the increased situation of synthesis runoff coefficient for the section that land character adjusts in planning region, design storm is judged
Whether the low-lying road link depth of accumulated water under intensity, which can impact low-lying road link traffic, even results in traffic paralysis,
Wherein, logic judgment value is set as j,
In formula, x indicates low-lying road horizontal slope minimum point depth of accumulated water in planning region；
As j=0, the synthesis runoff coefficient Ψ of the n-th section in planning regionnIncrease will not affect traffic safety
Waterlogging risk；As j=1, the synthesis runoff coefficient Ψ of the n-th section in planning regionnIncrease can affect traffic safety
Waterlogging risk.
Specific example is given below:
Choose a piece of 10.4km2Region is divided into 7 and is less than 2km2Section (according to " municipal sewerage engineering planning specification "
GB 50318-2017, when catchment area is no more than 2km2When, push pull azobenzene compounds calculating can be used in design flow of storm drain).Each section
Area, the synthesis runoff coefficient after former comprehensive runoff coefficient and Plan rescheduling it is as shown in table 1, the wherein land used of section 3 and 4
The quasi- adjustment of matter
1 section of table
The design storm intensity q of the region Storm Sewer SystemnFor 300L/ (shm2), rainfall duration t is 10min, return period 3
Year.
It calculates when rainfall reaches design storm intensity, exceeded amount of rainfall obtains
ΔQ3=q3×(Ψ3'-Ψ3)×S3=300 × (0.6-0.5) × 150=4500L/s
ΔQ4=q4×(Ψ4'-Ψ4)×S4=300 × (0.5-0.3) × 180=10800L/s
Δ Q=Δ Q3+ΔQ4=4500+10800=15300L/s
Low-lying link length L is 1000m, half range bituminous pavement width w1For 15m, half breadth w of red line2For 20m, horizontal slope slope
Spending α is 2%, and amount of crown h is 0.3m, and kerbstone exposed height s is 0.1m；Rainfall duration t is 10min, then it is minimum to calculate horizontal slope
Point depth of accumulated water.ThroughWithCalculate, x > s, ponding overflow to
On pavement, entire surface gathered water, depth of accumulated water is
Check in do not influence walking and cyclists only safety depth of accumulated water be H1For the above 0.3m in road surface, do not influence motor-driven
The depth of accumulated water H of the current safety of vehicle2For 0.15m (according to " municipal sewerage engineering planning specification " GB 50318-2017).
At this moment H1>H2, H=H1The safety of=0.3m, i.e. walking are unaffected, then are considered as waterlogging risk in tolerance interval
Interior, then the 0.38m depth of accumulated water of case has been more than H, and conclusion is that the land character variation of case can bring larger waterlogging risk, is built
It discusses regulatory authorities and modifies land use planning, or rainwater system while adjusting land character in Regeneration planning region
System.
Claims (4)
1. a kind of judgment method of the road waterlogging risk of town site expansion, which comprises the steps of:
1) the exceeded Rainfall runoff of planning region after land character changes is calculated；
2) the low-lying road horizontal slope minimum point depth of accumulated water of planning region is calculated；
3) constraint condition for not influencing traffic safety is combined, judges whether the increase of comprehensive runoff coefficient can bring waterlogging risk,
And road traffic is caused to be paralysed.
2. a kind of judgment method of the road waterlogging risk of town site expansion according to claim 1, feature
Be, step 1) be planning region is divided into it is N number of be less than akm2Section, each section using push pull azobenzene compounds calculate rainwater
Run-off:
Qn=qn×Ψn×Sn
In formula: QnIndicate the Rainfall runoff of the n-th section, unit: L/s；qnIndicate the design storm intensity of the n-th section, unit:
L/(s·hm2)；ΨnIndicate the synthesis runoff coefficient before the land character variation of the n-th section；SnIndicate the charge for remittance of the n-th section
Area, unit: hm2；
After land character variation, Storm Sewer System is constant, comprehensive runoff coefficient ΨnBecome Ψn', then
Qn'=qn×Ψn'×Sn
In formula: Qn' indicate Rainfall runoff after the variation of the n-th section land character under design storm intensity, unit: L/s；Ψn'
Indicate the synthesis runoff coefficient after the variation of the n-th section land character；
Work as Ψn'>ΨnWhen, Qn' > Qn, Rainfall runoff that road need to exclude is greater than Storm Sewer System ability, has ponding simultaneously on road
Form longitudinal runoff；I.e. when storm intensity reaches the design storm intensity q of Storm Sewer System in planning regionnWhen, the n-th section surpasses
Mark Rainfall runoff Δ QnFor
ΔQn=Qn'-Qn
=qn×(Ψn'-Ψn)×Sn
The exceeded Rainfall runoff Δ Q for accumulating the low-lying road of planning region is the sum of the exceeded Rainfall runoff of N number of section, then
3. a kind of judgment method of the road waterlogging risk of town site expansion according to claim 1, feature
Be, step 2) sets the stormwater facility of low-lying road in bituminous pavement two sides first, road axis two sides or in be divided to band two
Side equivalent ponding；Low-lying road half range bituminous pavement width is w1, half breadth w of red line2, amount of crown h；α is that low-lying road is horizontal
The gradient on slope；Low-lying link length is L, and rainfall duration t, low-lying road horizontal slope minimum point depth of accumulated water is x, and surface gathered water is wide
Degree is f, and kerbstone exposed height is s；As x < s, f < w1；As x > s, f > w1；
When low-lying the forms of road cross section is single carriageway road, the mathematic(al) representation of low-lying road ponding volume are as follows:
It is derived from low-lying road horizontal slope minimum point depth of accumulated water x are as follows:
In formula, Δ Q indicates the exceeded Rainfall runoff of the low-lying road of planning region.
4. a kind of judgment method of the road waterlogging risk of town site expansion according to claim 1, feature
It is, the constraint condition for not influencing traffic safety is set in step 3) are as follows: the ponding for not influencing walking and cyclists only safety is deep
Degree is H1, the depth of accumulated water for not influencing autos only safety is H2；Choose H1And H2In high level as judging that depth of accumulated water is
The no threshold value H for influencing traffic safety, i.e.,
In the increased situation of synthesis runoff coefficient for the section that land character adjusts in planning region, design storm intensity is judged
Under low-lying road link depth of accumulated water whether low-lying road link traffic can be impacted and even result in traffic paralysis,
In, set logic judgment value as j,
In formula, x indicates low-lying road horizontal slope minimum point depth of accumulated water in planning region；
As j=0, the synthesis runoff coefficient Ψ of the n-th section in planning regionnIncrease the waterlogging that will not affect traffic safety
Risk；As j=1, the synthesis runoff coefficient Ψ of the n-th section in planning regionnIncrease the waterlogging that can affect traffic safety
Risk then suggests that regulatory authorities modify land use planning, or while adjusting land character in Regeneration planning region
Storm-water system.
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Cited By (2)
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| CN113343806A (en) * | 2021-05-26 | 2021-09-03 | 深圳数研锦瀚智慧科技有限公司 | Runoff coefficient determining method, device, terminal and storage medium |
| CN114118544A (en) * | 2021-11-11 | 2022-03-01 | 深圳市赑玄阁科技有限公司 | Urban waterlogging detection method and device |
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