CN213022771U - Urban new area infiltration measuring and calculating device - Google Patents
Urban new area infiltration measuring and calculating device Download PDFInfo
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- CN213022771U CN213022771U CN202021745939.8U CN202021745939U CN213022771U CN 213022771 U CN213022771 U CN 213022771U CN 202021745939 U CN202021745939 U CN 202021745939U CN 213022771 U CN213022771 U CN 213022771U
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Abstract
The utility model relates to a device is calculated in infiltration under new district in city belongs to rainfall flood management technical field, include: measuring point space, a boundary segmentation device, a water collecting tank and a time-gravity sensor; the boundary dividing device enables measuring point spaces to be enclosed into a closed cube, the water collecting tank is installed on the periphery of the boundary dividing device, and the time-gravity sensor is installed on the lower portion of the water collecting tank. The beneficial effects of the utility model reside in that: 1, providing a device for measuring and calculating infiltration rate; 2, the device can accurately reflect the time-sharing characteristic of the infiltration amount.
Description
Technical Field
The utility model relates to a device is calculated in city new district infiltration belongs to rainfall flood management technical field, especially an use low influence development to carry out infiltration coefficient measuring device in city new district as the target.
Background
The construction of the new urban area utilizes the measures of 'stagnation' and 'storage' of sponge cities, reduces the runoff of the surface of the earth, relieves the pressure of urban waterlogging, and realizes the runoff control by buffering the change of rainfall. In fact, it is not appropriate for the design of new urban areas to adopt the total annual runoff control rate as a planning control standard. A large number of urban inland inundation phenomena can be seen, the core of urban inland inundation prevention is the design standard of single rainfall, and the runoff formed under the rainfall is only suitable as a planning control standard.
The urban infiltration capacity under the condition of single rainfall design standard is an important measurement index of the sponge city.
The infiltration capacity of a new urban area is a parameter reflecting the relationship between rainfall and runoff, and is a dynamic variable which is continuously changed in the rainfall process. The net rainfall minus the infiltration is the runoff. The infiltration amount is influenced by factors such as the type and gradient of the underlying surface, and is also related to the rainfall type, the duration of rainfall and the rainfall intensity, and the solving process is very complex.
Runoff coefficients are generally used in existing urban design for description. The runoff coefficient value is selected mainly by referring to GB50014-2006 outdoor drainage design specification (2016 edition), is a constant value obtained according to the type of a surface, cannot truly reflect the relation between rainfall and runoff under different conditions, and cannot meet the actual requirements of engineering. There are also scholars (Feng Yu Qi, Wang Wen Hai, Lijunqi, etc.. Water permeable road runoff coefficient test research, Water conservancy and hydropower technology, 2019[5 ]]27-35.) measuring runoff coefficient by a test platform, the test device consists of a manual rainfall simulation system, a permeable road and a flow monitoring system, the rainwater collection device is arranged at the tail end, the rainfall process and the road runoff production have time difference, the measured flow value and the rainfall formed runoff flow have certain delay time, and only the average value of the runoff coefficient in a certain period has error with the actual value[2]。
The most infiltration that can only reflect the road surface structure of current utility model, hold the circumstances of leaking, perhaps can only measure a certain road surface structure, also have a small amount of patents to simulate real road surface structure infiltration, stagnate and hold the rainwater condition (Liu and bin, zhufeng, road industry etc.. a rainwater runoff coefficient measuring device 2020/1/3, Beijing, CN 209894225U.), can more truly measure different road surface structures, but all be through the ratio constant of calculating runoff and precipitation, can't reflect the true condition. There is no suitable comprehensive measurement and calculation method for the complex conditions with multiple underlying surfaces and the multiple terrain features in the new urban area. Accurate estimation values cannot be obtained for infiltration characteristics of new urban areas.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a can carry out distributed measurement's device to the infiltration volume in city new district.
The urban new area infiltration measuring and calculating device comprises: measuring point space, a boundary segmentation device, a water collecting tank and a time-gravity sensor;
the boundary dividing device enables measuring point spaces to be enclosed into a closed cube, the water collecting tank is installed on the periphery of the boundary dividing device, and the time-gravity sensor is installed on the lower portion of the water collecting tank.
The measuring point space is a flat ground with the gradient not greater than 15 degrees, and the ground can provide an excavation area not less than 1m multiplied by 2.5 m; the height difference of two ends of the side length of 2.5m is not less than 5 cm; the upstream side of the lower seepage station is at the end with higher elevation, and the downstream side is at the end with lower elevation.
The excavation size of the measuring point space is 1m multiplied by 2.5m, and the excavation depth reaches a watertight layer; paving a watertight plate, a 10cm median particle size permeable layer and a reverse filtering layer in the excavation pit from bottom to top, and planning a lower cushion surface layer;
the boundary dividing device is a vertical isolation plate, and the height is selected according to the thickness from the earth surface to the impervious bed; the boundary dividing device surrounds 4 surfaces of the seepage measuring area, a hole is formed in the side with a lower elevation, and a water collecting tank is installed.
And a time-gravity sensor is arranged on the water collecting tank, and the weight of the water body in the water collecting tank at different times is recorded.
The beneficial effects of the utility model reside in that:
1, providing a device for measuring and calculating infiltration rate; 2, the device can accurately reflect the time-sharing characteristic of the infiltration amount.
Drawings
FIG. 1 is a schematic cross-sectional view of the spatial arrangement of seepage-measuring points;
FIG. 2 is a schematic view of a subsurface flow recession curve;
fig. 3 is a rainfall diagram corresponding to the curve of the water-out curve in fig. 2.
Detailed Description
Example one
A device for measuring and calculating infiltration in a new urban area. The distributed runoff coefficient processing can be carried out when a new area is planned, so that real runoff producing characteristics of the new city area are obtained.
As shown in fig. 1, the apparatus for measuring infiltration amount includes: measuring point space, a boundary dividing device 1 and a water collecting tank 2;
the boundary dividing device 1 is a vertical isolation plate, and the height is selected according to the thickness from the earth surface to the impervious bed;
this example is 1.2 m;
the boundary dividing device 1 surrounds 4 surfaces of the seepage measuring area, a hole is formed in one side with a lower elevation, and a water collecting tank 2 is installed.
The boundary dividing device is made of a waterproof material, in the embodiment, the boundary dividing device 1 is a PVC plate, 4 surfaces of the seepage measuring points are separated, a hole is formed in the lower side of the boundary dividing device, and a water collecting tank 2 is arranged;
as shown in fig. 1, planning an underlying surface to be a grassland, excavating the existing underlying surface by 1m × 2.5m according to the measurement point size of the planned underlying surface, wherein the excavation depth reaches 1.2m of a watertight layer; paving impermeable plates in the excavated pits from bottom to top, wherein the median particle size of the permeable layers is 10cm, the inverted filter layers and the grasslands;
the water collecting tank 2 is arranged at the bottom of the permeable layer with the median diameter of 10 cm.
And a time-gravity sensor is arranged on the water collecting tank 2, and a curve of the weight of the water body in the water collecting tank along with time change is recorded.
Recording the subsurface flow water-recession process of each rainfall process of an observation point in one year, and calculating the infiltration rate by the following method:
the maximum flow value of the interflow water-withdrawal curve is as follows:
and (4) summing the water quantities of all the water collecting tanks, and calculating time to obtain the maximum value in the flow values.
Claims (5)
1. The utility model provides a device is calculated in infiltration under new district in city which characterized in that: the method comprises the following steps: measuring point space, a boundary segmentation device, a water collecting tank and a time-gravity sensor;
the boundary dividing device enables measuring point spaces to be enclosed into a closed cube, the water collecting tank is installed on the periphery of the boundary dividing device, and the time-gravity sensor is installed on the lower portion of the water collecting tank.
2. The urban new area infiltration measurement and calculation device according to claim 1, characterized in that: the measuring point space is a flat ground with the gradient not greater than 15 degrees, and the ground can provide an excavation area not less than 1m multiplied by 2.5 m; the height difference of two ends of the side length of 2.5m is not less than 5 cm; the upstream side of the lower seepage station is at the end with higher elevation, and the downstream side is at the end with lower elevation.
3. The urban new area infiltration measurement and calculation device according to claim 1, characterized in that: the excavation size of the measuring point space is 1m multiplied by 2.5m, and the excavation depth reaches a watertight layer; paving a watertight plate in the excavation pit from bottom to top, wherein the gravel permeable layer with the median particle size of 10cm, a reversed filter layer and a lower cushion surface layer are planned.
4. The urban new area infiltration measurement and calculation device according to claim 1, characterized in that: the boundary dividing device is a vertical isolation plate, and the height is selected according to the thickness from the earth surface to the impervious bed; the boundary dividing device surrounds 4 surfaces of the seepage measuring area, a hole is formed in the side with a lower elevation, and a water collecting tank is installed.
5. The urban new area infiltration measurement and calculation device according to claim 1, characterized in that: and a time-gravity sensor is arranged on the water collecting tank, and the weight of the water body in the water collecting tank at different times is recorded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021745939.8U CN213022771U (en) | 2020-08-19 | 2020-08-19 | Urban new area infiltration measuring and calculating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021745939.8U CN213022771U (en) | 2020-08-19 | 2020-08-19 | Urban new area infiltration measuring and calculating device |
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| Publication Number | Publication Date |
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| CN213022771U true CN213022771U (en) | 2021-04-20 |
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| CN202021745939.8U Active CN213022771U (en) | 2020-08-19 | 2020-08-19 | Urban new area infiltration measuring and calculating device |
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| CN (1) | CN213022771U (en) |
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