CN106650053B - Rainwater pipe network optimization design method based on USRAMS - Google Patents
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Abstract
A rainwater pipe network optimization design method based on USRAMS belongs to the crossing field of drainage pipe network design and hydraulic model technology. Aiming at the defects of the reasoning formula method and the requirements of a new version of outdoor drainage standard, the invention constructs a USRAMS rainwater pipe network hydraulic model based on rainwater pipe network design data, utilizes motion waves to carry out simulation calculation, takes the pipe section overload as a check standard according to a model result, and optimizes a design scheme according to the model result, thereby achieving the purpose of improving the design reliability of the rainwater pipe network. The required parameters are few and easy to obtain, the runoff coefficient and the catchment time can be directly obtained, the model building process is simple and rapid, the model result is reliable, and the applicability of the method is ensured; the method has operability, does not need to write complex programs, can finish each step only by means of the existing software, is simple and easy to operate and easy to realize, and ensures the implementability of the patent.
Description
Technical Field
The invention relates to a rainwater pipe network optimization design method based on USRAMS, and belongs to the technical crossing field of drainage pipe network design and hydraulic model.
Background
The design of rainwater systems in China adopts a reasoning formula method combined with a constant uniform flow theory for a long time to carry out pipe network design calculation, and the method is only suitable for the design of a small area due to the limitation of self application conditions, and the calculation precision is low when the method is applied to a large catchment basin. New edition 'design code for outdoor drainage' (GB 50014-2006) stipulates that when catchment area exceeds 2km2In time, a mathematical model method is adopted to check and adjust the rainwater design scheme. With the release of new outdoor drainage standard, model technologyThe method is popularized in China, for example, MIKE URBAN of DHI company in Denmark, ICM of Wallingford company in UK, and SWMM model tool software of EPA company in America are widely applied in China.
An Urban waterlogging Risk Analysis model system (called USRAMS for short) is autonomously developed by a water supply and drainage system research room of Beijing university of industry on the basis of years of research. The USRAMS mainly comprises a one-dimensional pipe network model simulation calculation part and a two-dimensional earth surface flooding simulation calculation part, supports the coupling simulation calculation of the one-dimensional pipe network and the two-dimensional earth surface, is developed based on an embedded component library ArcEngine provided by ArcGIS, takes the current mainstream map data management platform ArcGIS as a management system of a bottom database, and adopts a Microsoft Access database as a base layer database system. The USRAMS adopts the SWMM which is commonly used in China at present as a calculation engine of a one-dimensional pipe network model hydraulic calculation, and adds an equal-flow time line module on the basis of the calculation engine, so that software better accords with the actual condition of China. The USRAMS well utilizes the data processing function of the ArcGIS, and can well process the basic data of the pipe network model by means of the ArcGIS.
At present, according to the requirements of a new version of 'design specification for outdoor drainage', the design recurrence period of the rainwater pipe network in China is prolonged to 3 to 5 years, the design method still continues to use an inference formula method, and in order to ensure that a pipe network system is safer, the specified reduction coefficient m value is 1. The reasoning formula method is used for calculating the confluence process of the pipe network based on the constant flow hydraulics theory, and the constant flow theory is adopted for calculating the hydrodynamics process of the pipe network. The reasoning formula method is used for determining water collection time according to the time of full-flow, and does not simulate the real confluence process of a pipeline through a flow process line. The non-constant flow algorithm based on the saint-wien equation set is needed to be adopted in the more accurate simulation of the pipe network convergence process, the non-constant water flow motion described by the saint-wien equation set is a long wave propagation phenomenon in shallow water and is generally called dynamic waves, because the main acting force of the water flow motion is gravity, the water flow motion belongs to the category of gravity waves, for example, inertia terms and pressure terms in motion equations are ignored, only the influence of friction and bottom slopes is considered, and the motion described by the simplified equation set is called motion waves.
The motion wave calculation method is to solve a continuity equation by utilizing a simplified form of a momentum equation of each pipe. The slope of the water surface of the pipe canal is equal to the bottom slope of the pipe canal when the motion wave is used for calculation, the maximum flow transported by the pipe canal can be the value of the full-flow normal water flow of the pipe canal, the calculation of the form does not consider the influence of backwater, and the distribution of the branch network is also limited by the inlet/outlet loss, the water flow reversion or the pressure flow. According to the hydraulics theory, the design conditions of the motion wave method and the inference formula method are the closest (the water surface gradient is equal to the bottom slope of the pipeline, and the maximum flow is the normal water flow value of the pipeline), so the motion wave method is needed when the design result of the inference formula method is checked.
Aiming at the defects of the inference formula method and the requirements of a new version of outdoor drainage standard, the rainwater pipe network optimization design method based on the USRAMS is provided. The method comprises the steps of constructing a USRAMS rainwater pipe network hydraulic model based on rainwater pipe network design data, performing simulation calculation by utilizing motion waves, taking overload of a pipe section (as shown in figure 1, the height of the running water surface of the pipe section is higher than the height of the pipe top, but does not exceed the ground, and the overload is not allowed to exist in pipe network design) as a check standard according to a model result, and optimizing a design scheme according to the model result, so that the purpose of improving the reliability of the rainwater pipe network design is achieved.
Disclosure of Invention
The invention mainly overcomes the defects of the inference formula method, improves the reliability of the design of the rainwater pipe network by utilizing the hydraulic model technology, and checks and optimizes the rainwater pipe network designed by the inference formula method. A rainwater pipe network optimization design method based on the USRAMS is provided by using the USRAMS and the hydraulics basic principle.
The technical scheme of the invention is as follows:
a rainwater pipe network optimization design method based on USRAMS sequentially comprises the following steps:
(1) completing preliminary design of the rainwater pipe network according to a reasoning formula method;
according to the new version of the design Specification for outdoor drainage GB 50014-2006 ground water collection time t1Taking 5-15 min, taking 3-5 years for a design recurrence period P, calculating a runoff coefficient psi according to various ground areas by using a weighted average method, taking 1 for a reduction coefficient m value, and selecting local parameters for storm intensity formula parameters. The existing Honghe municipal pipeline design software is used for finishing the preliminary design of the rainwater pipe network, and an xls-format rainwater pipe network hydraulic calculation table and a dwg-format rainwater pipe network plane layout diagram are output.
(2) GIS processing of rainwater pipe network and catchment area data
(2.1) GIS processing of rainwater pipe network data
Pasting the rainwater pipe network information in the preliminarily designed rainwater pipe network hydraulic calculation table with the xls format into a text file with the txt format according to the format requirement of CATDTableConvert software, naming the text file as Y.txt, reading the Y.txt text file by using the existing CATDTableConvert software, completing GIS of the rainwater pipe network by using a GIS conversion function in the CATDTableConvert software, and finally outputting inspection wells, water outlets and pipe sections in the rainwater pipe network subjected to GIS into shp format files by using an output Shape function, and naming the inspection wells, the water outlets, the pipe sections and the shp respectively.
(2.2) GIS processing of catchment area data
Loading the primarily designed dwg format file into ArcGIS software, selecting all elements of ' HY _ YS _ AREA _ BORDER L ING ' in a CAD file Ploygon layer by using an SQ L statement, exporting the selected elements as an shp format file and named as faces, and simultaneously loading shp into the ArcGIS software, reconstructing fields of the loaded shp format file, adding a number (Text type) and a water outlet (Text type) field, inputting the number (Sub ' & ' FID ' by using a field calculator, assigning the number field, loading the shp file obtained in the step (2.1) into the ArcGIS, loading the faces with a Spatial Join tool in the ArcGIS, establishing a corresponding relation between the shp and a manhole, and enabling the shp to be consistent with the corresponding relation in the primarily designed output face, inputting the face with the manhole using the field calculator, assigning the shp to a water outlet AREA.
(3) Method for building hydraulic model of USRAMS rainwater pipe network
(3.1) importing design rainwater pipe network data
Importing the inspection well, shp, water outlet, shp, pipe section, shp, catchment area and shp files obtained in the step (2) into a USRAMS software Access database, simultaneously uniformly assigning rainfall gauge fields of the catchment area and shp files to RG1, and respectively assigning catchment time and runoff coefficient fields to t1、Ψ。
(3.2) construction of Chicago rain type
And (3) constructing a Chicago rain model by utilizing the existing Chicago rain model generator according to a local rainstorm intensity formula and the design recurrence period P selected in the step (1), wherein a rain peak coefficient r is 0.3-0.5, the time interval is 1min, and the rainfall duration T is 180 min. And importing the generated rainfall time sequence file into a USRAMS model.
(4) Operational calculation of hydraulic model of USRAMS rainwater pipe network
Taking a model calculation step length of 1min, taking the running time of 3h, taking the report time step length of 1min, selecting an equal flow time line by a surface convergence model, selecting a motion wave by a pipe network convergence model, running the model after parameter setting is finished, and storing a model result after the model is run.
(5) Optimizing the design result of the rainwater pipe network according to the model result
And (3) reselecting the pipe diameter and the slope according to the model result by combining the maximum calculated flow of the pipe section, modifying the pipe section by utilizing the commands of modifying the pipe diameter and modifying the slope in the Honghe municipal pipeline software to ensure that the overflowing capacity of the pipe section is equal to the maximum calculated flow, and after all the overloaded pipe sections are modified, recalculating the modified rainwater pipe network by utilizing the Honghe municipal pipeline software and outputting the xls-format rainwater pipe network hydraulic calculation table again.
And (5) repeating the steps (1) to (5) until all pipe sections in the model result have no overload phenomenon.
The invention has the following beneficial effects:
1. the method of the invention can overcome the defects of the traditional reasoning formula method, and the design result of the rainwater pipe network is more reliable by utilizing the model technology, thereby providing guidance for the planning and design of the rainwater pipe network.
2. The method disclosed by the patent has the advantages that the required parameters are few and are easy to obtain, the runoff coefficient and the catchment time can be directly obtained, the model building process is simple and rapid, the model result is reliable, and the applicability of the method is ensured.
3. The method has operability, does not need to write complex programs, can finish each step only by means of the existing software, is simple and easy to operate and easy to realize, and ensures the implementability of the method.
Description of the drawings:
FIG. 1 is a schematic view of a pipeline overload
Fig. 2 is a schematic view of a work flow of the method for optimally designing a rainwater pipe network based on USRAMS according to the present invention.
FIG. 3 Prior to optimization of the pipeline
FIG. 4 after pipeline optimization
The specific implementation mode is as follows:
the specific implementation flow of the invention is shown in fig. 2, and comprises the following steps:
(1) according to the outdoor drainage design specification (GB 50014-2006) of the new edition, the ground water collecting time t1Taking 5-15 min, taking 3-5 years for a design recurrence period P, calculating a runoff coefficient psi according to various ground areas by using a weighted average method, taking 1 for a reduction coefficient m value, and selecting local parameters for storm intensity formula parameters. The existing Honghe municipal pipeline design software is used for finishing the preliminary design of the rainwater pipe network, and an xls-format rainwater pipe network hydraulic calculation table and a dwg-format rainwater pipe network plane layout diagram are output.
(2) Pasting the rainwater pipe network information in the preliminarily designed rainwater pipe network hydraulic calculation table with the xls format into a text file with the txt format according to the format requirement of CATDTableConvert software, naming the text file as Y.txt, reading the Y.txt text file by using the existing CATDTableConvert software, completing GIS of the rainwater pipe network by using a GIS conversion function in the CATDTableConvert software, and finally outputting inspection wells, water outlets and pipe sections in the GIS rainwater pipe network into shp format files by using an output Shape function, and naming the inspection wells, shp, water outlets, shp and shp respectively.
(3) Loading the primarily designed dwg format file into ArcGIS software, selecting all elements of ' HY _ YS _ AREA _ BORDER L ING ' in a CAD file Ploygon layer by using SQ L statement, exporting the selected elements as an shp format file and named as faces, and simultaneously loading shp into the ArcGIS software, reconstructing fields of the loaded shp format file, adding a number (Text type) and a water outlet (Text type) field, inputting the ' number ' Sub ' & ' FID ' by using a field calculator to assign values to the number fields, loading the inspection well obtained in the step (2) into the ArcGIS, and inputting the ' face ' with an inspection well by using a Spatial Join tool in the cGAARIS to establish a corresponding relationship between the shp and the inspection well, shp and keeping the corresponding relationship named as in the primary design of the step (1), and inputting the ' face ' sharf as an output face, shp as an output face and assigning AREA.
(4) Importing the inspection well, shp, water outlet, shp, pipe section, shp, catchment area and shp files obtained in the steps (2) to (3) into a USRAMS software Access database, simultaneously uniformly assigning rainfall gauge fields of the catchment area and shp files to RG1, and respectively assigning catchment time and runoff coefficient fields to t1、Ψ。
(5) And (3) constructing a Chicago rain model by utilizing the existing Chicago rain model generator according to a local rainstorm intensity formula and the design recurrence period P selected in the step (1), wherein a rain peak coefficient r is 0.3-0.5, the time interval is 1min, and the rainfall duration T is 180 min. And importing the generated rainfall time sequence file into a USRAMS model.
(6) Taking a model calculation step length of 1min, taking the running time of 3h, taking the report time step length of 1min, selecting an equal flow time line by a surface convergence model, selecting a motion wave by a pipe network convergence model, running the model after parameter setting is finished, and storing a model result after the model is run.
(7) And (3) reselecting the pipe diameter and the slope according to the model result by combining the maximum calculated flow of the pipe section, modifying the pipe section by utilizing the commands of modifying the pipe diameter and modifying the slope in the Honghe municipal pipeline software to ensure that the overflowing capacity of the pipe section is equal to the maximum calculated flow, and after all the overloaded pipe sections are modified, recalculating the modified rainwater pipe network by utilizing the Honghe municipal pipeline software and outputting the xls-format rainwater pipe network hydraulic calculation table again.
(8) And (4) repeating the steps (1) to (7) until all pipe sections in the model result have no overload phenomenon.
Description of the effects:
by comparing the effects before and after optimization of the pipe section between the inspection well YDX446 and the inspection well YDX444, the effects before and after optimization are shown in FIGS. 3 and 4.
According to the comparison of the effects before and after the optimization of the figures 3 and 4, the pipeline overload phenomenon exists before the pipeline optimization, and the pipeline overload phenomenon does not exist after the pipeline optimization, so that the implementability of the method is explained.
Claims (1)
1. A rainwater pipe network optimization design method based on USRAMS is characterized by comprising the following steps:
(1) completing preliminary design of the rainwater pipe network according to a reasoning formula method;
according to the design code for outdoor drainage GB 50014-2006 ground water collecting time t1Taking 5-15 min, taking 3-5 years for a design recurrence period P, calculating a runoff coefficient psi according to various ground areas by using a weighted average method, taking 1 for a reduction coefficient m value, and selecting local parameters for storm intensity formula parameters; finishing the preliminary design of the rainwater pipe network by using the existing Hongheyu municipal pipeline design software, and outputting an xls-format rainwater pipe network hydraulic calculation table and a dwg-format rainwater pipe network plane layout diagram;
(2) GIS processing of rainwater pipe network and catchment area data
(2.1) GIS processing of rainwater pipe network data
Pasting rainwater pipe network information in an xls-format rainwater pipe network hydraulic calculation table obtained through preliminary design into a text file in a txt format according to the format requirement of CATDTableConvert software, naming the text file as Y.txt, reading the Y.txt text file by using the existing CATDTableConvert software, completing GIS of a rainwater pipe network by using a GIS conversion function in the CATDTableConvert software, and finally outputting inspection wells, water outlets and pipe sections in the rainwater pipe network subjected to GIS into shp format files by using an output Shape function, and naming the inspection wells, the water outlets, the pipe sections and the shp respectively;
(2.2) GIS processing of catchment area data
Loading the file in the dwg format obtained by the preliminary design into ArcGIS software, selecting all elements of 'HY _ YS _ AREA _ BORDER L ING' in a CAD file Ploygon layer by using an SQ L statement, exporting the selected elements into an shp format file and named as faces, simultaneously loading shp into the ArcGIS software, reconstructing fields of the loaded shp format file, adding numbers and water outlet fields, inputting the number 'Sub' & 'FID' by using a field calculator, assigning values to the number fields, loading the inspection well obtained in the step (2.1), loading the shp file into the ArcGIS, and utilizing a spatialin Join tool in the ArcGIS to establish a corresponding relation between the faces and the inspection well, establishing a corresponding relation between the shp and the inspection well, keeping the shp consistent with the corresponding relation in the preliminary design in the step (1), and inputting the number of the water outlet faces, the shp file, the exit face and the water outlet AREA;
(3) method for building hydraulic model of USRAMS rainwater pipe network
(3.1) importing design rainwater pipe network data
Importing the inspection well, shp, water outlet, shp, pipe section, shp, catchment area and shp files obtained in the step (2) into a USRAMS software Access database, simultaneously uniformly assigning rainfall gauge fields of the catchment area and shp files to RG1, and respectively assigning catchment time and runoff coefficient fields to t1、Ψ；
(3.2) construction of Chicago rain type
Constructing a Chicago rain pattern by utilizing the existing Chicago rain pattern generator according to a local rainstorm intensity formula and the design recurrence period P selected in the step (1), wherein a rain peak coefficient r is 0.3-0.5, the time interval is 1min, and the rainfall duration T is 180 min; importing the generated rainfall time sequence file into a USRAMS model;
(4) operational calculation of hydraulic model of USRAMS rainwater pipe network
Taking a model calculation step length of 1min, taking the running time of 3h, taking the report time step length of 1min, selecting an equal flow time line by a surface convergence model, selecting a motion wave by a pipe network convergence model, running the model after parameter setting is finished, and storing a model result after the model is run;
(5) optimizing the design result of the rainwater pipe network according to the model result
According to the model result, for the pipe section with the overload pipe section, combining the maximum calculated flow of the pipe section to reselect the pipe diameter and the gradient, and simultaneously modifying the pipe section by utilizing the commands of modifying the pipe diameter and modifying the gradient in the Honghou municipal pipeline software to ensure that the flow capacity is equal to the maximum calculated flow, after all the overload pipe sections are modified, utilizing the Honghou municipal pipeline software to recalculate the modified rainwater pipe network, and outputting the calculated table again;
and (5) repeating the steps (1) to (5) until all pipe sections in the model result have no overload phenomenon.
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| CN108132984B (en) * | 2017-12-14 | 2021-10-22 | 重庆大学 | Rendering method and device for rainfall recurrence period of pipe network and computer readable storage medium |
| CN110147574B (en) * | 2019-04-16 | 2022-12-13 | 吉林大学珠海学院 | Auxiliary design method and system for roof siphon rainwater system and storage medium |
| CN110298075B (en) * | 2019-05-23 | 2022-09-23 | 深圳市规划国土发展研究中心 | Urban municipal drainage pipeline one-map modeling processing method based on ArcGIS + InfoWorks ICM |
| CN111709108B (en) * | 2019-12-27 | 2024-01-23 | 广州市市政工程设计研究总院有限公司 | Pollution emission reduction analysis method and system based on big data |
| CN113806901B (en) * | 2021-09-27 | 2024-07-23 | 福州城建设计硏究院有限公司 | Method and storage device for optimizing rainwater pipe channel system designed based on rainwater management model |
| CN114564774B (en) * | 2022-01-26 | 2024-07-26 | 同济大学 | Reasoning method and model method coupling interactive driving design and modeling method for rainwater pipe channel |
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