CN109886537B - Method for judging road waterlogging risk of urban construction land expansion - Google Patents
Method for judging road waterlogging risk of urban construction land expansion Download PDFInfo
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Abstract
A method for judging the waterlogging risk of a road with expanded urban construction land comprises the following steps: calculating the overproof rainwater runoff of the planned area after the land property is changed; calculating the lowest point water depth of a cross slope of a low-lying road in a planned area; and judging whether the increase of the comprehensive runoff coefficient brings waterlogging risk or not by combining constraint conditions which do not influence traffic safety, and causing road traffic paralysis. The method is simple, convenient and practical. The method has the popularization value that when urban planning is carried out, whether the land property adjusting scheme brings waterlogging risks or not can be checked according to the land property adjusting scheme of the sub-area in the planned area, a planner is helped to prevent the urban waterlogging from the perspective of traffic safety in the land property adjusting stage, a feedback mechanism for the urban planning in the aspect of road drainage is further formed, and the urban construction land is controlled to be expanded reasonably.
Description
Technical Field
The invention relates to a method for judging urban road drainage waterlogging prevention risks, in particular to a method for judging urban construction land expansion road waterlogging risks.
Background
The area of urban construction land is continuously increased due to the continuous gathering of urban population, the urban planning construction land is expanded to be a normal state, but the matching of the municipal pipe network is difficult to be synchronously performed with the newly added urban construction land. The increase of the construction land results in that the rainwater runoff exceeds the rainwater pipe canal coping ability, thereby forming the rainwater that exceeds standard that can not in time be got rid of by rainwater discharge system, and the rainwater that exceeds standard can be collected along road surface or hollow ground to downstream low-lying road, causes urban road traffic potential safety hazard.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for judging the road waterlogging risk caused by the expansion of urban construction land.
The technical scheme adopted by the invention is as follows: a method for judging the waterlogging risk of a road with expanded urban construction land comprises the following steps:
1) Calculating the overproof rainwater runoff of the planned area after the land property is changed;
2) Calculating the lowest point water depth of a cross slope of a low-lying road in a planned area;
3) And judging whether the increase of the comprehensive runoff coefficient brings waterlogging risk or not by combining constraint conditions which do not influence traffic safety, and causing road traffic paralysis.
Step 1) dividing a planning area into N parts which are less than a km 2 Each subarea adopts an inference formula method to calculate rainwater runoff:
Q n ＝q n ×Ψ n ×S n
in the formula: q n Represents the rainwater runoff of the nth zone, unit: l/s; q. q.s n Represents the design rainstorm intensity of the nth zone in units: l/(s.hm) 2 )；Ψ n Representing the comprehensive runoff coefficient before the change of the land use property of the nth region; s. the n Represents the catchment area of the nth sheet area, unit: hm 2 ；
After the land property is changed, the rainwater pipe channel is not changed, and the comprehensive runoff coefficient psi is obtained n Into Ψ n ', then
Q n '＝q n ×Ψ n '×S n
In the formula: q n ' represents the rainwater runoff under the design storm intensity after the nth zone has changed land properties, and the unit is: l/s; Ψ n ' represents the comprehensive runoff coefficient after the change of the land property of the nth zone;
when Ψ n '>Ψ n When is, Q n '＞Q n The runoff of the rainwater to be drained on the road is larger than the capacity of a rainwater pipe duct, and accumulated water is accumulated on the road and forms longitudinal runoff; namely, when the rainstorm intensity reaches the designed rainstorm intensity q of the rainwater pipe duct in the planned area n When the temperature of the water is higher than the set temperature,
excessive rainwater runoff delta Q of nth zone n Is composed of
ΔQ n ＝Q n '-Q n ＝q n ×(Ψ n '-Ψ n )×S n
The overproof rainwater runoff delta Q accumulated to the low-lying road of the planned area is the sum of the overproof rainwater runoff of the N districts, and then
Step 2) firstly, setting rainwater facilities of the low-lying road on two sides of the asphalt pavement, and collecting equivalent water on two sides of a central line or two sides of a median zone of the road; the width of the half-width asphalt pavement of the low-lying road is w 1 Half width w of red line 2 The height of the road arch is h; alpha is the gradient of the cross slope of the low-lying road; the length of the low-lying road is L, the rainfall duration is t, the lowest point water depth of a cross slope of the low-lying road is x, the width of surface water accumulation is f, and the exposed height of the curbstone is s; when x is<s, f<w 1 (ii) a When x is>s, f>w 1 ；
When the cross section of the low-lying road is in a single road form, the mathematical expression of the accumulated water volume of the low-lying road is as follows:
deducing the lowest point water depth x of the cross slope of the low-lying road as follows:
in the formula, Δ Q represents the excessive rainwater runoff of the low-lying road of the planned area.
The constraint conditions which do not influence the traffic safety are set in the step 3): the depth of the accumulated water which does not affect the walking and the passing safety of the bicycle is H 1 The depth of the accumulated water which does not influence the passing safety of the motor vehicle is H 2 (ii) a Selecting H 1 And H 2 The medium high value is used as a threshold value H for judging whether the depth of the accumulated water influences the traffic safety, i.e.
Under the condition that the comprehensive runoff coefficient of a plot area with the land property adjusted in the planned area is increased, judging whether the accumulated water depth of a low-lying road under the designed rainstorm intensity can influence the traffic of the low-lying road or even cause traffic paralysis, wherein a logic judgment value is set to be j,
in the formula, x represents the lowest dot water depth of a cross slope of a low-lying road in a planned area;
when j =0, the comprehensive runoff coefficient psi of the nth zone in the planning zone n The risk of waterlogging which does not influence traffic safety is increased; when j =1, the comprehensive runoff coefficient psi of the nth zone in the planning zone n And (4) increasing the risk of waterlogging which affects traffic safety, recommending relevant management departments to modify a land utilization plan, or updating a rainwater system in a planned area while adjusting the land property.
The invention relates to a method for judging waterlogging risk of a road with expanded urban construction land, which can obtain the waterlogging depth of the lowest point of a cross slope of a low-lying road in a planned area according to some available parameters and judge whether the waterlogging of the low-lying road brings the waterlogging risk or not from the perspective of traffic safety. The method is simple, convenient and practical. The method has the popularization value that when urban planning is carried out, whether the land property adjusting scheme brings waterlogging risks or not can be checked according to the land property adjusting scheme of a piece of area in the planned area, a planner is helped to prevent the urban waterlogging from the perspective of traffic safety at the stage of adjusting the land property, and then a feedback mechanism for urban planning in the aspect of road drainage is formed to control the reasonable expansion of urban construction land.
Drawings
FIG. 1 is a flowchart of a method for determining a risk of waterlogging on a road having an expanded urban construction land according to the present invention;
FIG. 2 is a schematic representation of a single-lane cross-sectional dimension element of the present invention.
Detailed Description
The method for determining the risk of road waterlogging caused by expansion of urban construction land according to the present invention is described in detail with reference to the following embodiments and accompanying drawings.
As shown in fig. 1, the method for judging the road waterlogging risk of urban construction land expansion of the present invention comprises the following steps:
1) Calculating the overproof rainwater runoff of the planned area after the land property is changed; particularly, a planning area is divided into N parts which are smaller than akm 2 Each subarea adopts an inference formula method to calculate rainwater runoff:
Q n ＝q n ×Ψ n ×S n
in the formula: q n Represents the rainwater runoff quantity of the nth zone, and the unit is: l/s; q. q.s n Represents the design rainstorm intensity of the nth zone in units: l/(s.hm) 2 )；Ψ n Representing the comprehensive runoff coefficient before the change of the land use property of the nth region; s n Represents the catchment area of the nth sheet area, unit: hm 2 ；
After the land property is changed, the rainwater pipe channel is not changed, and the comprehensive runoff coefficient psi is obtained n Becomes Ψ n ', then
Q n '＝q n ×Ψ n '×S n
In the formula: q n ' represents the runoff of rain at design storm intensity after change of the land property of the nth zone, unit: l/s; Ψ n ' represents the comprehensive runoff coefficient after the change of the land property of the nth zone;
when t is n '>Ψ n When is, Q n '＞Q n The runoff of the rainwater to be drained on the road is larger than the capacity of a rainwater pipe duct, and accumulated water is accumulated on the road and forms longitudinal runoff; namely, when the rainstorm intensity reaches the designed rainstorm intensity q of the rainwater pipe duct in the planned area n When the temperature of the water is higher than the set temperature,
excessive rainwater runoff delta Q of nth zone n Is composed of
ΔQ n ＝Q n '-Q n ＝q n ×(Ψ n '-Ψ n )×S n
The excessive rainwater runoff delta Q accumulated to the low-lying road of the planned area is the sum of the excessive rainwater runoff of the N sections, and then
3.2 Calculating the lowest point water depth of the cross slope of the low-lying road in the planned area; firstly, rainwater facilities of a low-lying road are set on two sides of an asphalt pavement, and equal amounts of accumulated water are arranged on two sides of a central line or two sides of a median zone of the road; as shown in FIG. 2, the width of the half-width asphalt pavement of the low-lying road is w 1 Half width w of red line 2 The height of the road arch is h; alpha is the gradient of the cross slope of the low-lying road; the length of the low-lying road is L, the rainfall duration is t, the lowest point water depth of a cross slope of the low-lying road is x, the width of the surface water accumulation is f, and the exposed height of the curbstone is s; when x is<s, f<w 1 (ii) a When x is>s, f>w 1 ；
When the cross section of the low-lying road is in a single road form, the mathematical expression of the accumulated water volume of the low-lying road is as follows:
deducing the lowest point water depth x of the cross slope of the low-lying road as follows:
in the formula, Δ Q represents an excessive rainwater runoff of a low-lying road of a planned area.
3) And judging whether the increase of the comprehensive runoff coefficient brings waterlogging risk or not by combining constraint conditions which do not influence traffic safety, and causing road traffic paralysis. Considering that the urban roads are mainly passenger traffic, mainly pedestrians, bicycles, small buses and buses, when the depth of accumulated water exceeds a certain value, the pedestrians, the bicycles, the small buses or the buses can pass through the urban roads, so that potential safety hazards can be caused, and even the urban roads can not pass through the urban roads.
The constraint conditions which do not influence traffic safety are set as follows: the depth of the accumulated water which does not affect the walking and the passing safety of the bicycle is H 1 The depth of the accumulated water which does not influence the traffic safety of the motor vehicle is H 2 (ii) a Selecting H 1 And H 2 The high value of the water level is used as a threshold value H for judging whether the depth of the accumulated water affects the traffic safety, namely
Under the condition that the comprehensive runoff coefficient of a plot area with the land property adjusted in the planned area is increased, judging whether the accumulated water depth of a low-lying road under the designed rainstorm intensity can influence the traffic of the low-lying road or even cause traffic paralysis, wherein a logic judgment value is set to be j,
in the formula, x represents the lowest dot water depth of a cross slope of a low-lying road in a planned area;
when j =0, the comprehensive runoff coefficient psi of the nth zone in the planning zone n The increase of the inner part does not influence the traffic safetyRisk of waterlogging; when j =1, the comprehensive runoff coefficient psi of the nth zone in the planning zone n The increase brings the risk of waterlogging which affects traffic safety.
Specific examples are given below:
selecting a slice of 10.4km 2 Area, divided into 7 less than 2km 2 When the catchment area is not more than 2km according to the urban drainage engineering planning Specification GB 50318-2017 2 And the designed flow of the rainwater can be calculated by adopting an inference formula method). The area of each plot, the original synthetic runoff coefficient and the planned adjusted synthetic runoff coefficient are shown in table 1, wherein the land use property of plots 3 and 4 is intended to be adjusted
TABLE 1 section
Designed rainstorm intensity q of rainwater pipe canal in the area n Is 300L/(s.hm) 2 ) The rainfall duration t is 10min, and the recurrence period is 3 years.
Calculating the amount of the overproof rainwater when the rainfall reaches the designed rainstorm intensity
ΔQ 3 ＝q 3 ×(Ψ 3 '-Ψ 3 )×S 3 ＝300×(0.6-0.5)×150＝4500L/s
ΔQ 4 ＝q 4 ×(Ψ 4 '-Ψ 4 )×S 4 ＝300×(0.5-0.3)×180＝10800L/s
ΔQ＝ΔQ 3 +ΔQ 4 ＝4500+10800＝15300L/s
The length L of the low-lying road is 1000m, and the width w of the half-width asphalt pavement 1 15m, half width w of red line 2 20m, the gradient alpha of the cross slope is 2%, the height h of the road arch is 0.3m, and the exposed height s of the kerbstone is 0.1m; and (5) calculating the lowest point product water depth of the cross slope when the rainfall lasts for 10 min. Warp beam
And &>
Calculation of x>s, the accumulated water flows to the sidewalk, the water is accumulated on the whole pavement, and the depth of the accumulated water is
Finding the water accumulation depth H which does not influence the walking and bicycle passing safety 1 0.3m above the road surface, and the water accumulation depth H which does not influence the passing safety of the motor vehicle 2 Is 0.15m (according to urban drainage engineering planning Specification GB 50318-2017).
At this time H 1 >H 2 ，H＝H 1 If the walking safety is not affected, the waterlogging risk is considered to be in an acceptable range, the waterlogging depth of 0.38m of the case exceeds H, and the result shows that the change of the land property of the case brings a large waterlogging risk, and related management departments are recommended to modify the land utilization plan or update the rainwater system in the planned area while the land property is adjusted.
Claims (2)
1. A method for judging the road waterlogging risk caused by expansion of urban construction land is characterized by comprising the following steps:
1) Calculating the overproof rainwater runoff of the planned area after the land property is changed;
particularly, a planning area is divided into N parts which are less than a km 2 Each parcel adopts an inference formula method to calculate the rainwater runoff:
Q n ＝q n ×Ψ n ×S n
in the formula: q n Represents the rainwater runoff of the nth zone, unit: l/s; q. q.s n Represents the design storm intensity of the nth zone, unit: l/(s.hm) 2 )；Ψ n Representing the comprehensive runoff coefficient before the change of the land use property of the nth region; s n Represents the catchment area of the nth sheet area, unit: hm 2 ；
After the land property is changed, the rainwater pipe channel is not changed, and the comprehensive runoff coefficient psi is obtained n Becomes Ψ n ', then
Q n '＝q n ×Ψ n '×S n
In the formula: q n ' represents the runoff of rain at design storm intensity after change of the land property of the nth zone, unit: l/s; Ψ n ' represents the comprehensive runoff coefficient after the change of the land property of the nth zone;
when t is n '>Ψ n When is, Q n '＞Q n The runoff of the rainwater to be drained by the road is larger than the capacity of a rainwater pipe and canal, and the road is accumulated with water to form longitudinal runoff; namely, when the rainstorm intensity reaches the designed rainstorm intensity q of the rainwater pipe duct in the planned area n In time, the excessive rainwater runoff quantity delta Q of the nth zone n Is composed of
ΔQ n ＝Q n '-Q n
＝q n ×(Ψ n '-Ψ n )×S n
The overproof rainwater runoff delta Q accumulated to the low-lying road of the planned area is the sum of the overproof rainwater runoff of the N districts, and then
2) Calculating the lowest point water depth of a cross slope of the low-lying road in the planning area;
firstly, rainwater facilities of a low-lying road are set on two sides of an asphalt pavement, and equal amounts of accumulated water are arranged on two sides of a central line or two sides of a median zone of the road; the width of the half-width asphalt pavement of the low-lying road is w 1 Half width w of red line 2 The height of the road arch is h; alpha is the gradient of the cross slope of the low-lying road; the length of the low-lying road is L, the rainfall duration is t, the lowest point water depth of a cross slope of the low-lying road is x, the width of the surface water accumulation is f, and the exposed height of the curbstone is s; when x is<s, f<w 1 (ii) a When x is>s, f>w 1 ；
When the cross section of the low-lying road is in a single road form, the mathematical expression of the accumulated water volume of the low-lying road is as follows:
deducing the lowest point water depth x of the cross slope of the low-lying road as follows:
in the formula, delta Q represents the overproof rainwater runoff of a low-lying road in a planned area;
3) And judging whether the increase of the comprehensive runoff coefficient brings waterlogging risk or not by combining constraint conditions which do not influence traffic safety, and causing road traffic paralysis.
2. The method for judging the waterlogging risk of the road with the expanded urban construction land according to claim 1, wherein the constraint condition that the traffic safety is not affected is set in step 3): the depth of the accumulated water which does not affect the walking and the passing safety of the bicycle is H 1 The depth of the accumulated water which does not influence the traffic safety of the motor vehicle is H 2 (ii) a Selecting H 1 And H 2 The medium high value is used as a threshold value H for judging whether the depth of the accumulated water influences the traffic safety, i.e.
Under the condition that the comprehensive runoff coefficient of a plot area with the land property adjusted in a planned area is increased, judging whether the waterlogging depth of a low-lying road under the designed rainstorm intensity influences the road traffic of the low-lying road or even leads to traffic paralysis, wherein a logic judgment value is set as j,
in the formula, x represents the lowest dot product water depth of a cross slope of a low-lying road in a planned area;
when j =0, planning the synthesis of the nth area in the areaCombined runoff coefficient psi n The risk of waterlogging which does not influence traffic safety is increased; when j =1, the comprehensive runoff coefficient psi of the nth zone in the planning zone n And (4) increasing the risk of waterlogging which affects traffic safety, recommending relevant management departments to modify a land utilization plan, or updating a rainwater system in a planned area while adjusting the land property.
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| 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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