CN109657407A - A kind of grass planting ditch cross dimensions calculation method enhancing dry grass planting ditch water seepage function - Google Patents
A kind of grass planting ditch cross dimensions calculation method enhancing dry grass planting ditch water seepage function Download PDFInfo
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- CN109657407A CN109657407A CN201910020992.7A CN201910020992A CN109657407A CN 109657407 A CN109657407 A CN 109657407A CN 201910020992 A CN201910020992 A CN 201910020992A CN 109657407 A CN109657407 A CN 109657407A
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Abstract
A kind of grass planting ditch cross dimensions calculation method enhancing dry grass planting ditch water seepage function, to obtain the optimal design size of dry grass planting ditch section, it include: based on Infiltration Model, in the case where given hydraulic detention time, the height that water penetrates into soil is calculated, the height is the depth capacity of dry grass planting ditch；Filter layer cross-sectional area based on dry grass planting ditch is equal to the area of the infiltration layer water in hydraulic detention time, calculates the depth capacity of dry grass planting ditch filter layer；Calculate the flow mode for entering dry grass planting ditch；Consider dry grass planting ditch permeability performance, the flow that rainwater penetrates into soil in dry grass planting ditch is added in Manning formula；Dry grass planting ditch section design element is checked；The control requirement of runoff volume based on dry grass planting ditch, determines the length of dry grass planting ditch.The present invention is that dry grass planting ditch sectional geometric property seeks optimal solution, improves dry grass planting ditch to the processing capacity of storm runoff.
Description
Technical field
The present invention relates to a kind of grass planting ditch cross dimensions calculation methods.More particularly to a kind of dry grass planting ditch infiltration function of enhancing
The grass planting ditch cross dimensions calculation method of energy.
Background technique
With the quickening of urbanization process, city surface source pollution caused by storm runoff has caused the height weight of international community
Depending on becoming the hot spot of urban environment research.Various engineerings and non-are proposed for city surface source pollution problem both at home and abroad at present
The technical measures of engineering.Grass planting ditch is one such technical measures, and in many developed countries, it is widely used in city
Runoff pollution of area source control system.
According to transmission mode of the rainwash in grass planting trench, grass planting ditch is divided into 3 seed types: standard transmission grass planting ditch,
Dry grass planting ditch and wet grass planting ditch.Wherein the function of dry grass planting ditch is most most widely used by force, compared to standard transmission grass planting ditch, it
It in the design include the underdrainage system of the filter layer as composed by artificial reconstructed soil and the laying of filter layer bottom,
Design enhances transmission, filtering, infiltration and the water-holding capacity of rainwater, to guarantee that rainwater is arranged in hydraulic detention time from irrigation canals and ditches
It is dry.
Dry grass planting ditch functionally increases the ability of infiltration than standard transmission grass planting ditch, so designing in cross dimensions
On also answer it is different.But in traditional grass planting ditch cross dimensions computation model, only only account for grass planting ditch transmission, filtering,
And the design requirement of water storage function.Water seepage function is not accounted for the requirement in terms of dry grass planting ditch cross dimensions, makes dry grass planting
Performance of the ditch in terms of water seepage function is not achieved optimal.
Summary of the invention
The technical problem to be solved by the invention is to provide one kind can be improved dry grass planting ditch to storm runoff processing capacity
The dry grass planting ditch water seepage function of enhancing grass planting ditch cross dimensions calculation method.
The technical scheme adopted by the invention is that: a kind of grass planting ditch cross dimensions calculating enhancing dry grass planting ditch water seepage function
Method includes the following steps: to obtain the optimal design size of dry grass planting ditch section
1) it is based on Infiltration Model, in the case where given hydraulic detention time, calculates the height that water penetrates into soil, the height
Degree is the depth capacity of dry grass planting ditch；
2) the filter layer cross-sectional area based on dry grass planting ditch is equal to the area of the infiltration layer water in hydraulic detention time,
Calculate the depth capacity of dry grass planting ditch filter layer；
3) flow mode for entering dry grass planting ditch is calculated；
4) consider dry grass planting ditch permeability performance, the stream that rainwater penetrates into soil in dry grass planting ditch is added in Manning formula
Amount；
5) dry grass planting ditch section design element is checked；
6) the control requirement of the runoff volume based on dry grass planting ditch, determines the length of dry grass planting ditch.
Infiltration Model described in step 1) are as follows:Wherein, i0For infiltration rate, unit m/s；S is soil hygroscopic
Rate, unit m/s0.5；T is hydraulic detention time, unit s, less than 24 × 3600s.
The depth capacity of the dry grass planting ditch of calculating described in step 1) is basis in hydraulic detention time t, in dry grass planting ditch
Ponding can fully penetrate into dry grass planting ditch filter layer, determine grass ditch depth capacity d1,Wherein: tgFor
Maximum hydraulic detention time, unit s；i0For infiltration rate, unit m/s；T is hydraulic detention time, unit s, less than 24 ×
3600s。
Step 2) is by formula:Export the depth capacity d of dry grass planting ditch filter layer2:
Wherein: s is soil hygroscopic rate, unit m/s0.5, tgFor maximum hydraulic detention time, unit s；θSFor saturated soil moisture content；k1
For dry grass planting ditch soil horizon cross-sectional area coefficient；B is dry grass planting ditch filter layer top surface width, unit m；I0For cumulative infiltration；
SAreaFor the filter layer cross-sectional area of dry grass planting ditch.
The flow mode formula that the step 3) calculating enters dry grass planting ditch is as follows: Q1QF × 10=ψ-3, it is denoted as formula
(1), wherein Q1For the flow mode for entering dry grass planting ditch, unit m3/ s, ψ are comprehensive runoff coefficient, and ψ numerical value is less than 1；F is
Catchment area；Q is design storm intensity.
The Manning formula that rainwater penetrates into the flow of soil in dry grass planting ditch is added in step 4) are as follows: Wherein, Q2Run-off, unit m are calculated for grass planting ditch3/ s, V are that rainwater exists
The mean flow rate of grass planting ditch section, unit m/s；A is dry grass planting ditch cross sectional area, when grass planting ditch cross sectional area is parabola
When section:When grass planting ditch cross sectional area is trapezoidal cross-section: A=B*d1+z*d1 2；R is that grass planting ditch is cross-section
The hydraulic radius in face, when grass planting ditch cross sectional area is parabola section:When grass planting ditch cross sectional area is
When trapezoidal cross-section: I is grass planting ditch head fall；N is Manning coefficient；Z is trapezoidal cross-section grade of side slope；ksIt is full
And soil hydraulic conductivity, m/s；B is dry grass planting ditch filter layer top surface width；d1For careless ditch depth capacity.
Step 5) includes:
The storm intensity met respectively with 1 year one and the storm intensity met for 30 years one calculate the rainfall runoff for entering dry grass planting ditch
Measure Q1, and calculate grass planting ditch and calculate run-off Q2；As the Q that the storm intensity met with 1 year one is calculated2<Q1When, with 30 years
The Q that one storm intensity met is calculated2>Q1When, the value for adjusting B recalculates grass planting ditch and calculates run-off Q2；Until with 1 year
The Q that one storm intensity met is calculated2>Q1, the Q that is calculated of storm intensity that was met with 30 years one2<Q1, at this moment, grass planting ditch
There is the ability of processing heavy rain enough, and runoff rate and depth will not cause to corrode in grass planting ditch, calculates finish at this time, obtain dry
The value of grass planting ditch filter layer top surface width B.
Step 6) uses following formula: VR=Aave× L=θS× A × L, wherein VRIt is infiltrated for the delay of dry grass planting ditch rainwater
Control amount, unit m3；AaveFor the average water cross-sectional area of maximum, unit m2, Aave=θS×A；L is dry grass planting ditch length, unit
m；θSFor saturated soil moisture content；A is dry grass planting ditch cross sectional area, unit m2。
A kind of grass planting ditch cross dimensions calculation method enhancing dry grass planting ditch water seepage function of the invention, by analyzing dry plant
The influence that the relevant parameters such as careless ditch permeability performance, flow, volume generate dry grass planting ditch sectional geometric property, finds out between the two
Existing functional relation, seek optimal solution for dry grass planting ditch sectional geometric property, improve dry grass planting ditch to the place of storm runoff
Reason ability.It has the effect that
(1) in hydraulic detention time, dry grass planting ditch internal water accumulation can fully penetrate into dry grass planting ditch filter layer.
(2) in hydraulic detention time, dry grass planting ditch filter layer can fully absorb dry grass planting ditch internal water accumulation.
(3) under the premise of considering dry grass planting ditch permeability performance, Manning formula is transformed, more objectively describes dry grass planting ditch
Interior waterpower situation of change.
(4) the dry grass planting ditch length of determination is provided and refers to value.
Detailed description of the invention
Fig. 1 is a kind of flow chart for the grass planting ditch cross dimensions calculation method for enhancing dry grass planting ditch water seepage function of the present invention.
Fig. 2 is a kind of grass planting ditch structure chart for enhancing dry grass planting ditch water seepage function of the present invention.B is dry grass planting ditch filter layer top
Face width, d1For hay ditch depth capacity, d1For the depth capacity of dry grass planting ditch filter layer.
Specific embodiment
Below with reference to embodiment and attached drawing to a kind of grass planting ditch section ruler for enhancing dry grass planting ditch water seepage function of the invention
Very little calculation method is described in detail.
As shown in Figure 1, a kind of grass planting ditch cross dimensions calculation method for enhancing dry grass planting ditch water seepage function of the invention, is
To obtain the optimal design size of dry grass planting ditch section, include the following steps:
1) it is based on Infiltration Model, in the case where given hydraulic detention time, calculates the height that water penetrates into soil, the height
Degree is the depth capacity of dry grass planting ditch；Wherein, the Infiltration Model are as follows:Wherein, i0It is single for infiltration rate
Position m/s；S is soil hygroscopic rate, unit m/s0.5；T is hydraulic detention time, unit s, less than 24 × 3600s.The calculating
The depth capacity of dry grass planting ditch is according in hydraulic detention time t, and dry grass planting ditch internal water accumulation can fully penetrate into dry grass planting ditch
Filter layer determines hay ditch depth capacity d1,Wherein: tgFor maximum hydraulic detention time, unit
s；i0For infiltration rate, unit m/s；T is hydraulic detention time, unit s, less than 24 × 3600s.
2) the filter layer cross-sectional area based on dry grass planting ditch is equal to the area of the infiltration layer water in hydraulic detention time
This relationship calculates the depth capacity of dry grass planting ditch filter layer；By formula:Export dry grass planting ditch mistake
The depth capacity d of filtering layer2:Wherein: s is soil hygroscopic rate, unit m/s0.5, tgIt is single for maximum hydraulic detention time
Position s；θSFor saturated soil moisture content；k1For dry grass planting ditch soil horizon cross-sectional area coefficient；B is that dry grass planting ditch filter layer top surface is wide
Degree, unit m；I0For cumulative infiltration；SAreaFor the filter layer cross-sectional area of dry grass planting ditch.
3) flow mode for entering dry grass planting ditch is calculated；The calculating enters the flow mode formula of dry grass planting ditch such as
Under: Q1QF × 10=ψ-3, it is denoted as formula (1), wherein Q1For the flow mode for entering dry grass planting ditch, unit m3/ s, ψ are synthesis
Runoff coefficient, ψ numerical value is less than 1；F is catchment area；Q is design storm intensity.
4) consider dry grass planting ditch permeability performance, the stream that rainwater penetrates into soil in dry grass planting ditch is added in Manning formula
Amount；The Manning formula that rainwater penetrates into the flow of soil in dry grass planting ditch is added are as follows:It is denoted as formula (2)；Wherein, Q2Run-off, unit m are calculated for grass planting ditch3/
S, V are mean flow rate of the rainwater in grass planting ditch section, unit m/s；A is dry grass planting ditch cross sectional area, when grass planting ditch cross section
When area is parabola section:When grass planting ditch cross sectional area is trapezoidal cross-section: A=B*d1+z*d1 2；R
For the hydraulic radius in grass planting ditch cross section, when grass planting ditch cross sectional area is parabola section:When grass planting ditch
When cross sectional area is trapezoidal cross-section: I is grass planting ditch head fall；N is Manning coefficient；Z is trapezoidal cross-section side
The slope gradient；ksFor saturated soil hydraulic conductivity, m/s；B is dry grass planting ditch filter layer top surface width；d1For careless ditch depth capacity.
5) dry grass planting ditch section design element is checked；Include: respectively with 1 year one meet storm intensity and 30 years one meet it is sudden and violent
Rain Strength co-mputation enters the flow mode Q of dry grass planting ditch1, and calculate grass planting ditch and calculate run-off Q2；When what is met with 1 year one
The Q that storm intensity is calculated2<Q1When, the Q that is calculated of storm intensity that was met with 30 years one2>Q1When, adjust the value of B again
It calculates grass planting ditch and calculates run-off Q2；Until the Q that the storm intensity met with 1 year one is calculated2>Q1, with the heavy rain of 30 years one chances
The Q that Strength co-mputation obtains2<Q1, at this moment, grass planting ditch has the ability of processing heavy rain enough, and runoff rate and depth be not in grass planting ditch
It can cause to corrode, calculate finish at this time, obtain the value of dry grass planting ditch filter layer top surface width B.
6) the control requirement of the runoff volume based on dry grass planting ditch, determines the length of dry grass planting ditch.Using following formula: VR
=Aave× L=θS× A × L, wherein VRControl amount, unit m are infiltrated for the delay of dry grass planting ditch rainwater3；AaveIt is averagely deposited for maximum
Water cross-sectional area, unit m2, Aave=θS×A；L is dry grass planting ditch length, unit m；θSFor saturated soil moisture content；A is dry plants
Careless ditch cross sectional area, unit m2。
The following are apply a specific embodiment of the invention.
Embodiment 1:
It is disconnected to a kind of grass planting ditch for enhancing dry grass planting ditch water seepage function of the present invention as specific embodiment using Tianjin industrial area
Face size computing method is described in further detail.The region occupied area about 2hm2, Permeable stratum area accounts for 56%, region Nei Bao
Include warehouse, the land-use styles such as Administrative Area and parking lot.Region is high-density development area, and the gradient is rainwater utilization from west to east
System drainage mode is planned to land drainage, and soil permeability is very low, and level of ground water is shallow and vulnerable to pollution.Dry grass planting ditch design
Rainwater transmission and first class purification to warehouse adjacent to road.The slope change of dry grass planting ditch coverage is larger, by depot road
Dry grass planting ditch maximum head fall be 1:500, coverage catchment area be 1.25*104m2.Due to dry by depot road
Grass planting ditch head fall is larger, and flow velocity and section depth design should consider dry grass planting ditch minimum treat runoff ability (by 1 year one
The storm intensity of chance) slope erosion is prevented again.Rainfall runoff is for 24 hours, to meet within 1 year one in the maximum residence time of dry grass planting ditch
Storm intensity is 29mm/h, and the storm intensity met for 30 years one is 63mm/h；Dry grass planting ditch section configuration be it is trapezoidal, grade of side slope is
1:4；Runoff coefficient of tabling look-up to integrate takes 0.8, Manning coefficient 0.1.
Step 101, it is based on Infiltration Model, calculates the depth capacity of dry grass planting ditch.Wherein, Infiltration Model isWherein i0For infiltration rate, unit m/s；S is soil hygroscopic rate, and the soil soil property selected is silty loam, value
0.0013m/s0.5；T is 24 × 3600s of hydraulic detention time value.According to hydraulic detention time, dry grass planting ditch internal water accumulation can
Dry grass planting ditch filter layer is fully penetrated into, determines grass ditch depth capacity,Solve d1=0.38m.
Step 102, it is equal to multiplied by grass planting ditch unit length in hydraulic retention based on the filter layer cross-sectional area of grass planting ditch
This relationship of the volume of the water of interior infiltration layer, calculates the depth capacity of dry grass planting ditch filter layer.It solves Wherein: tgFor hydraulic detention time, θsFor saturated soil moisture content, k1It is dry
Grass planting ditch filter layer cross-sectional area coefficient, B are soil horizon section upper bottom width (m).Embodiment 1 selects soil soil property for powder earth
Soil, saturated soil moisture content 60%, dry grass planting ditch filter layer section configuration are trapezoidal cross-section, and z is trapezoidal cross-section grade of side slope,
Value 0.25, cross-sectional area B*d2-z*d2 2, solve
Step 103, the flow mode for entering dry grass planting ditch, Q are calculated1QF × 10=ψ-3, it is denoted as formula (1), wherein Q1
To design flow mode (m3/ s), ψ is comprehensive runoff coefficient, and numerical value takes 0.8；F is catchment area (104m2) value 1.25*
104m2；Q is design storm intensity (L/s*104m2), the storm intensity met for 1 year one is 29mm/h, 30 years one storm intensities met
For 63mm/h.For 1 year one chance catchment flow: For 30 years one chance catchment flows:
Step 104, consider dry grass planting ditch permeability performance, Manning formula is transformed, rainwater is added and penetrates into soil in dry grass planting ditch
The flow of earth.It is denoted as formula (2)；Wherein, Q2Runoff is calculated for grass planting ditch
Measure (m3/s).V is mean flow rate (m/s) of the rainwater in grass planting ditch section.A is grass planting ditch cross sectional area (m2), when grass planting ditch is horizontal
When cross-sectional area is parabola section:When grass planting ditch cross sectional area is trapezoidal cross-section: A=B*d1+z*
d1 2；R is the hydraulic radius in grass planting ditch cross section, when grass planting ditch cross sectional area is parabola section:Work as plant
When careless ditch cross sectional area is trapezoidal cross-section:Z is trapezoidal cross-section grade of side slope, value 0.25.I is grass planting ditch
Head fall (m/m), value 0.002.N is Manning coefficient value 0.1.ksFor saturated soil hydraulic conductivity, value 0.01m/s.B is
Dry grass planting ditch filter layer top surface width.d1For careless ditch depth capacity (m), value 0.38m.The above relevant parameter is substituted into formula
(2), it obtains:
Step 105, dry grass planting ditch section design element is carried out to check.When calculating grass planting ditch optimal width, need with step
Formula (2) checks Q in formula (1) and step 104 in rapid 1031And Q2, as the Q that the storm intensity met with 1 year one is calculated2<
Q1When, and the Q being calculated with the storm intensity of 30 years one chances2>Q1When, return-formula (2) adjusts the value of B, until meet with
Until lower condition.That is, as the Q being calculated with the storm intensity of 1 year one chance2>Q1When, grass planting ditch has the energy of processing heavy rain enough
Power；And the Q that the storm intensity met with 30 years one is calculated2<Q1When, runoff velocity and depth will not cause to corrode in grass planting ditch,
It calculates and finishes at this time, obtain dry grass planting ditch filter layer top surface width.It constantly brings B value into and carries out optimization computation, finally obtain and work as B
Value meet dry grass planting ditch section design element when being 0.65m-1.02m and check, for the rainwater transmission for maximizing dry grass planting ditch
With infiltration ability, it is maximized the best value that 1.02m is B.B value is substituted into step 102 simultaneously, obtains d2=0.78m.Step
In rapid 106, is controlled based on runoff volume and require to determine grass planting ditch length, VR=Aave× L=θS× A × L, wherein VRIt is planted to be dry
Control amount (m is infiltrated in careless ditch rainwater delay3), value 100m3；AaveFor the average water cross-sectional area of maximum, unit m2, Aave=θS
×A；L is dry grass planting ditch length (m)；θsFor saturated soil moisture content, value 0.6；A is grass planting ditch cross sectional area (m2), value
0.4237m2.It is computed, L=393m.
Although having carried out foregoing description to the present invention in conjunction with attached drawing, the invention is not limited to above-mentioned specific implementations
Mode, the above mentioned embodiment is only schematical, rather than restrictive, and those skilled in the art are at this
Under the enlightenment of invention, without deviating from the spirit of the invention, many variations can also be made, these belong to of the invention
The column of protection.
Claims (8)
1. a kind of grass planting ditch cross dimensions calculation method for enhancing dry grass planting ditch water seepage function, which is characterized in that dry to obtain
The optimal design size of grass planting ditch section, includes the following steps:
1) it is based on Infiltration Model, in the case where given hydraulic detention time, calculates the height that water penetrates into soil, the height is
For the depth capacity of dry grass planting ditch；
2) the filter layer cross-sectional area based on dry grass planting ditch is equal to the area of the infiltration layer water in hydraulic detention time, calculates
The depth capacity of dry grass planting ditch filter layer；
3) flow mode for entering dry grass planting ditch is calculated；
4) consider dry grass planting ditch permeability performance, the flow that rainwater penetrates into soil in dry grass planting ditch is added in Manning formula；
5) dry grass planting ditch section design element is checked；
6) the control requirement of the runoff volume based on dry grass planting ditch, determines the length of dry grass planting ditch.
2. a kind of grass planting ditch cross dimensions calculation method for enhancing dry grass planting ditch water seepage function according to claim 1,
It is characterized in that, Infiltration Model described in step 1) are as follows:Wherein, i0For infiltration rate, unit m/s；S is soil hygroscopic
Rate, unit m/s0.5；T is hydraulic detention time, unit s, less than 24 × 3600s.
3. a kind of grass planting ditch cross dimensions calculation method for enhancing dry grass planting ditch water seepage function according to claim 1,
It is characterized in that, the depth capacity of the dry grass planting ditch of calculating described in step 1) is basis in hydraulic detention time t, dry grass planting ditch
Internal water accumulation can fully penetrate into dry grass planting ditch filter layer, determine grass ditch depth capacity d1,Wherein: tg
For maximum hydraulic detention time, unit s；i0For infiltration rate, unit m/s；T is hydraulic detention time, unit s, less than 24 ×
3600s。
4. a kind of grass planting ditch cross dimensions calculation method for enhancing dry grass planting ditch water seepage function according to claim 1,
It is characterized in that, step 2) is by formula:Export the depth capacity d of dry grass planting ditch filter layer2:Wherein: s is soil hygroscopic rate, unit m/s0.5, tgFor maximum hydraulic detention time, unit s；θSFor soil saturation
Moisture content；k1For dry grass planting ditch soil horizon cross-sectional area coefficient；B is dry grass planting ditch filter layer top surface width, unit m；I0It is accumulative
Infiltration capacity；SAreaFor the filter layer cross-sectional area of dry grass planting ditch.
5. a kind of grass planting ditch cross dimensions calculation method for enhancing dry grass planting ditch water seepage function according to claim 1,
It is characterized in that, the flow mode formula that the step 3) calculating enters dry grass planting ditch is as follows: Q1QF × 10=ψ-3, it is denoted as formula
(1), wherein Q1For the flow mode for entering dry grass planting ditch, unit m3/ s, ψ are comprehensive runoff coefficient, and ψ numerical value is less than 1；F is
Catchment area；Q is design storm intensity.
6. a kind of grass planting ditch cross dimensions calculation method for enhancing dry grass planting ditch water seepage function according to claim 1,
It is characterized in that, the Manning formula that rainwater penetrates into the flow of soil in dry grass planting ditch is added in step 4) are as follows: Wherein, Q2Run-off, unit m are calculated for grass planting ditch3/ s, V are that rainwater exists
The mean flow rate of grass planting ditch section, unit m/s；A is dry grass planting ditch cross sectional area, when grass planting ditch cross sectional area is parabola
When section: When grass planting ditch cross sectional area is trapezoidal cross-section: A=B*d1+z*d1 2；R is that grass planting ditch is cross-section
The hydraulic radius in face, when grass planting ditch cross sectional area is parabola section:When grass planting ditch cross sectional area is
When trapezoidal cross-section:I is grass planting ditch head fall；N is Manning coefficient；Z is trapezoidal cross-section grade of side slope；ksFor
Saturated soil hydraulic conductivity, m/s；B is dry grass planting ditch filter layer top surface width；d1For careless ditch depth capacity.
7. a kind of grass planting ditch cross dimensions calculation method for enhancing dry grass planting ditch water seepage function according to claim 1,
It is characterized in that, step 5) includes:
The storm intensity met respectively with 1 year one and the storm intensity met for 30 years one calculate the flow mode Q for entering dry grass planting ditch1,
And it calculates grass planting ditch and calculates run-off Q2；As the Q that the storm intensity met with 1 year one is calculated2< Q1When, it was met with 30 years one
The Q that is calculated of storm intensity2> Q1When, the value for adjusting B recalculates grass planting ditch and calculates run-off Q2；Until being met with 1 year one
The Q that is calculated of storm intensity2> Q1, the Q that is calculated of storm intensity that was met with 30 years one2< Q1, at this moment, grass planting ditch has
The ability of processing heavy rain enough, and runoff rate and depth will not cause to corrode in grass planting ditch, calculate finish at this time, obtain dry plant
The value of careless ditch filter layer top surface width B.
8. a kind of grass planting ditch cross dimensions calculation method for enhancing dry grass planting ditch water seepage function according to claim 1,
It is characterized in that, step 6) uses following formula: VR=Aave× L=θS× A × L, wherein VRIt is infiltrated for the delay of dry grass planting ditch rainwater
Control amount, unit m3；AaveFor the average water cross-sectional area of maximum, unit m2, Aave=θS×A；L is dry grass planting ditch length, unit
m；θSFor saturated soil moisture content；A is dry grass planting ditch cross sectional area, unit m2。
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| CN112733467A (en) * | 2020-12-28 | 2021-04-30 | 重庆大学 | Method for setting opening angle of water inlet of grass planting ditch on road |
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