CN-122022542-A - Urban drainage canal efficiency evaluation method

CN122022542ACN 122022542 ACN122022542 ACN 122022542ACN-122022542-A

Abstract

The invention discloses an urban drainage pipe efficiency evaluation method, which belongs to the technical field of urban drainage pipe efficiency evaluation and comprises the following steps of obtaining basic data of drainage subareas, wherein the basic data comprise topography, hydrological weather, current situation of a bedding surface, rainwater pipe data, field monitoring data and related plans, constructing a drainage pipe network model according to the basic data, and constructing an efficiency index system, wherein the efficiency index system comprises boundary conditions, hydraulic performance and operation effects, the boundary conditions, the hydraulic performance and the operation effects comprise a plurality of evaluation indexes, index evaluation tables and index types corresponding to the boundary conditions, a plurality of evaluation indexes are selected as target evaluation indexes according to the basic data and the index types, and evaluation results obtained according to the basic data, the drainage pipe network model and the target evaluation indexes.

Inventors

LIU GUANGQI
PU PENG
REN MEIFANG

Assignees

中国城市规划设计研究院

Dates

Publication Date: 20260512
Application Date: 20251222

Claims (7)

1.A method for evaluating urban drainage canal performance, comprising the steps of: Basic data of a drainage partition is obtained, wherein the basic data comprises topography, hydrological weather, current situation of an underlying surface, rainwater pipe channel data, field monitoring data and related planning; Constructing a drainage pipe network model according to the basic data; the method comprises the steps of constructing a performance index system, wherein the performance index system comprises boundary conditions, hydraulic performance and operation effects, and the boundary conditions, the hydraulic performance and the operation effects comprise a plurality of evaluation indexes, and corresponding index scoring tables and index types; selecting a plurality of evaluation indexes as target evaluation indexes according to the basic data and the index types; and according to the basic data, the drainage pipe network model and the target evaluation index, obtaining an evaluation result.
2. The method of urban drainage canal performance assessment according to claim 1, wherein, Constructing a drainage pipe network model according to the basic data, comprising: An initial drainage pipe network model is constructed, Preprocessing rainwater pipe channel data, inputting the data into an initial drainage pipe network model, and generalizing a drainage pipe channel in the initial drainage pipe network model; based on a Thiessen polygon method, generating sub-catchment partitions according to the outline of the surrounding land areas of the pipeline in the initial drainage pipe network model according to the basic data; And carrying out parameter assignment on the sub-catchment areas of the initial drainage pipe network model to obtain the drainage pipe network model, wherein the parameter assignment comprises the area occupation ratio of the impermeable area, the non-hollow area proportion, the infiltration coefficient, the Manning coefficient, the storage regulation and the hydrodynamic model.
3. The method of urban drainage canal performance assessment according to claim 1, wherein, Boundary conditions including a discharge jacking restriction index, foreign water sink control index, and a runoff generation control index; wherein, the calculation formula of the limit index of the ejection port jacking is as follows: In the formula, Represents the limit index of the top support of the drainage port, The flow rate of the main pipe under the design working condition is represented, The flow of the main pipe under the working condition of the jacking outflow is represented; wherein foreign water is incorporated into the control index, and the calculation formula is as follows: In the formula, The representation foreign water is incorporated into the control index, Representing the most unfavorable segment of the plumbing or node facilities in the drainage partition under the design recurring time criteria, Representing the radial flow generated by the drainage partition under the design reproduction period standard, Representing the flow of foreign water into the drain partition under the design recurring time standard; wherein, the runoff produces the control index, and the calculation formula is as follows: In the formula, Represents a runoff generation control index, Represents a drainage partition peak runoff control target, The peak runoff after development of the drainage partition is represented, Represents the peak total runoff volume control objective of the drainage partition, Representing the peak total runoff volume of the drainage partition.
4. The method of urban drainage canal performance assessment according to claim 1, wherein, Hydraulic performance including pipe design capacity parameters, node facility capacity indexes, pipe defect comprehensive indexes and auxiliary comprehensive indexes; Wherein, the canal design ability parameter, the calculation formula is as follows: In the formula, Representing the canal design ability index, Indicating the design flow capacity that the evaluation pipe segment should achieve, Representing an evaluation of the actual flow capacity of the pipe section; If the node facility is a rainwater lifting pump station, the node facility capacity index is calculated according to the following formula: In the formula, Representing an index of the capabilities of the node facility, Indicating the design lifting capacity that the lifting pump station should achieve, Representing the actual lifting capacity of the lifting pump station; if the node facility is a rainwater regulation project, the node facility capacity index is calculated according to the following formula: In the formula, Indicating the design regulation amount to be achieved by the evaluation pump station, Representing the actual regulation quantity of the current situation of the regulation engineering; Wherein, the comprehensive index of the pipe defect is calculated as follows: In the formula, Represents the comprehensive index of the defects of the pipe canal, Representing parameters of structural defects of the pipe section, The calculation formula for the functional defect parameters of the pipe section and the structural defect parameters of the pipe section are as follows: In the formula, A parameter indicative of a damaged condition of the first pipe segment, Representing a defect score at a structural defect of the pipe segment, A parameter indicative of a failure condition of the second pipe segment, Indicating the number of structural defects of the pipe section, Represents the number of defects with a longitudinal clear distance greater than 1.5m, Represents the number of defects having a longitudinal clear distance of greater than 1.0m and not greater than 1.5m, Represent the first A defect score greater than 1.5m in longitudinal clear distance, Representing defect scores with a longitudinal clear distance greater than 1.0m and no greater than 1.5m, Representing the structural defect impact coefficient, ; The calculation formula of the functional defect parameters of the pipe section is as follows: In the formula, Indicating the operating parameters of the first pipe segment, Representing a defect score at the functional defect of the pipe segment, Indicating the operating parameters of the second pipe segment, Indicating the number of functional defects of the pipe section, Represents the number of defects with a longitudinal clear distance greater than 1.5m, Represents the number of defects having a longitudinal clear distance of greater than 1.0m and not greater than 1.5m, Represent the first A defect score greater than 1.5m in longitudinal clear distance, Representing defect scores with a longitudinal clear distance greater than 1.0m and no greater than 1.5m, Representing the functional defect impact coefficient, ; Wherein, the auxiliary facility comprehensive index is calculated as follows: In the formula, Indicating the comprehensive index of the auxiliary facilities, Indicating an accessory facility overcurrent capability index, Indicating the design overcurrent capacity to be achieved by evaluating the pipe section gully, Indicating and evaluating the actual overflow capacity of the pipe section gully, Indicating that the index of the defect of the accessory setting, Represents the total number of gullies in the evaluation section, Indicating the number of defective gullies.
5. The method of urban drainage canal performance assessment according to claim 1, wherein, The operation effect comprises a pipe canal connection effect index, a pipe well overflow control index and an overflow pollution control index; wherein, the pipe connection effect index, the calculation formula is as follows: In the formula, The index of the pipe joint effect is shown, Represent the first The length of the segment overload tube segment, Represent the first The segment evaluates the length of the tube segment, Indicating that the drain pipe system evaluates the number of pipe sections, Indicating that overloaded pipe segment data is occurring; wherein, the pipe well overflows the control index, the computational formula is as follows: In the formula, Indicating the control index of the overflow of the pipe well, The design storm intensity for overflowing the pipe well in the drainage subarea is shown, Indicating the minimum storm intensity that caused a pipe well overflow to occur within the drainage partition.
6. The method of urban drainage canal performance assessment according to claim 1, wherein, The index type comprises a necessary choice and an optional choice; Selecting a plurality of evaluation indexes as target evaluation indexes according to the basic data and the index types, wherein the method comprises the following steps: selecting an evaluation index with the index type of necessary choice as a first index; Selecting an evaluation index with the selectable index type as a second index; and determining a target evaluation index according to the first index and the second index.
7. The method of urban drainage canal performance assessment according to claim 1, wherein, The evaluation result obtained according to the basic data, the drainage pipe network model and the target evaluation index comprises the following steps: calculating a plurality of index data corresponding to the target evaluation index according to the basic data and the drainage pipe network model; and determining target scores of target evaluation indexes according to the plurality of index data and the corresponding index scoring tables, and taking the target scores as evaluation results of the drainage pipe.

Description

Urban drainage canal efficiency evaluation method Technical Field The invention belongs to the technical field of urban drainage canal efficiency, and particularly relates to an urban drainage canal efficiency evaluation method. Background Along with the continuous acceleration of the urban process in China, urban waterlogging disasters frequently become outstanding problems for restricting the high-quality development of cities, and seriously threaten the life and property safety of residents and the normal running order of cities. The drainage pipeline system is used as a core infrastructure for urban flood control and drainage, and the running efficiency of the drainage pipeline system directly determines the capacity of the urban to cope with the waterlogging. The quantitative evaluation of the running efficiency of the canal is a precondition for accurately identifying running symptoms of the drainage system and scientifically making a reconstruction optimization strategy, has important practical significance and urgency for improving the urban waterlogging treatment level and guaranteeing the urban water safety, and becomes one of the core focus points in the urban waterlogging research field. At present, for quantitative evaluation of the running efficiency of a rainwater pipe channel, no unified standard is formed in China, related researches are stopped at a theoretical level, and the conventional evaluation method has obvious defects although being widely applied, and is difficult to accurately, objectively and comprehensively describe the actual capacity of the pipe channel. The current common assessment method mainly comprises three types, namely, one is a recurrence period back-calculation assessment method, the method takes an inference formula method as a core, the problem of insufficient design capability is assessed by back-calculation of whether the recurrence period of the corresponding design of the pipe channel meets the standard or not, the core principle is that the runoff is calculated based on the assumed condition of constant uniform flow, and then the hydraulic design of the pipe channel is carried out according to gravity flow, but the application range of the method is strictly limited, the method is definitely applicable to the scene with smaller catchment area or shorter catchment time at home and abroad, when the catchment area exceeds the limiting range, the error is obviously increased, the deviation of the design of the pipe channel is caused, the surplus capability of the pipe channel in bearing is not considered, the actual drainage capability of the pipe channel is easily underestimated, and the unnecessary transformation cost is further increased. And secondly, an operation effect judging method is adopted, the actual overflow condition of the drainage system is used as a judging standard of insufficient capacity of the pipe channel, evaluation is carried out from the aspect of actual operation effect, although the method is visual and clear, as the drainage pipe channel is a complex integral system, the occurrence node of overflow problem is often not matched with the pipe section with defects in practice, for example, the bottleneck problem that the overflow section of a downstream main pipe is reduced due to deformation, the overflow of a plurality of nodes at the upstream is possibly caused, and the real problem pipe section is extremely easy to miss only by taking the overflow node as an evaluation basis. And thirdly, a pipe channel state judging method is used for simulating the pipe channel running state by means of a mathematical model, pipe channel fullness or overload condition is used as a judging standard, pipe channel capacity is estimated from the perspective of hydraulic characteristics, although simulation results can be comprehensively analyzed, the model construction process is complex, waterlogging and ponding investigation efficiency is greatly reduced, the matching of pipe channel boundary conditions and the whole system is difficult to effectively evaluate, and bottleneck syndrome of the system cannot be accurately locked. In addition, auxiliary analysis means such as a flow velocity distribution diagram can only evaluate the flow velocity condition, and quantitative analysis of waterlogging and ponding causes can not be realized, so that the limitation of the prior art system is further highlighted. Therefore, there is a need for a method for evaluating urban drainage canal performance to solve the shortcomings of the prior art. Disclosure of Invention In view of the above, the present invention provides a method for evaluating the efficiency of an urban drainage canal, which is used for solving the problems that the existing efficiency evaluation method has a certain disadvantage, and the actual efficiency of the drainage canal cannot be accurately, objectively and comprehensively described, and the bottleneck of the system cannot be locked. In