CN-121998261-A - Flood discharge capacity evaluation method, equipment, medium and product of existing railway drainage facilities in mountain area covered by vegetation

CN121998261ACN 121998261 ACN121998261 ACN 121998261ACN-121998261-A

Abstract

The application discloses a flood discharge capacity evaluation method, equipment, medium and product of existing railway drainage facilities in a mountain area covered by vegetation, and relates to the field of railway facility maintenance. The method comprises the steps of determining the surface runoff under different rainfall intensity conditions and the peak flow of each drainage facility, determining the design flow of each drainage facility and the actual allowable flow under different blockage conditions, and determining the drainage facility drainage capacity evaluation result according to the peak flow of each drainage facility under different rainfall intensity conditions, the design flow and the actual allowable flow under different blockage conditions. The application can directly establish the relation between the rainfall intensity along the railway and the allowable flow of the railway drainage facilities, and improves the efficiency and accuracy of evaluating the drainage capacity of the existing railway drainage facilities in the mountain area covered by vegetation.

Inventors

SUN YIQING
TIAN YANG
LI CHUNHUA
REN GUANGXUE
LIU GUIWEI
CUI QINGGUO
ZHANG XUANYU
SHANG HAIMIN
WANG FEI
SUN QIHAO
LI HONGXU

Assignees

中国铁路设计集团有限公司

Dates

Publication Date: 20260508
Application Date: 20260409

Claims (10)

1. The flood discharge capacity evaluation method for the existing railway drainage facilities in the mountain area under vegetation coverage is characterized by comprising the following steps of: Basic data of a research area is acquired, wherein the basic data comprise annual rainfall data, topographic data, satellite remote sensing image data, drainage facility data and railway line position data; According to the basic data, a digital elevation model and an oblique photography three-dimensional model for removing vegetation influence in a research area are determined by adopting an aviation measurement method; According to the digital elevation model and the basic data for removing vegetation influence, carrying out hydrologic analysis and calculation, dividing the catchment areas of the drainage facilities by combining the oblique photography three-dimensional model, and determining the catchment areas corresponding to the drainage facilities; Determining the surface runoff under different rainfall intensity conditions according to the characteristic parameters of the research area and the annual rainfall data, and determining the peak flow of each drainage facility under different rainfall intensity conditions according to the corresponding catchment area of each drainage facility, wherein the characteristic parameters comprise soil thickness, groundwater level, permeability coefficient, land utilization type and soil hydrologic condition; Determining design flow of each drainage facility and actual allowable flow under different blocking conditions according to drainage facility form parameters of a research area, blocking conditions and basic data, wherein the drainage facility form parameters comprise drainage facility aperture, clear height, longitudinal slope, blocking proportion and material type; And determining drainage facility drainage capacity evaluation results of the research area according to the peak flow of each drainage facility under different rainfall intensity conditions, the design flow of each drainage facility and the actual allowable flow under different blockage conditions.
2. The method for evaluating flood discharge capacity of existing railway drainage facilities in a mountain area under vegetation coverage according to claim 1, wherein the method for determining a digital elevation model and an oblique photography three-dimensional model for removing vegetation influence in a research area by adopting an aviation measurement method according to basic data specifically comprises the following steps: Determining a three-dimensional map model of the research area according to the topographic data and the satellite remote sensing image data; Comprehensively considering the position and the topographic features of the drainage facility according to the three-dimensional map model of the research area, preliminarily defining the range of the catchment area, and determining the aviation measurement range according to the range of the catchment area; Determining a ground-imitating flying route of the unmanned aerial vehicle according to the aviation measurement range, and determining real ground high-density laser radar point cloud data and oblique photography data under vegetation coverage based on the ground-imitating flying route; Filtering the real ground high-density laser radar point cloud data to obtain a digital elevation model for removing vegetation influence; And carrying out three-dimensional modeling on the oblique photography data to obtain an oblique photography three-dimensional model.
3. The method for evaluating flood discharge capacity of existing railway drainage facilities in a vegetation covered downhill area according to claim 2, wherein the three-dimensional modeling of oblique photography data is performed to obtain an oblique photography three-dimensional model, and the method specifically comprises: According to the oblique photographic data, calculating the position, angle and camera attribute of each image by adopting an aerial triangulation algorithm, and generating an aerial triangulation result; generating a point cloud according to an aerial triangulation result, and constructing an irregular triangular grid model; And registering texture images according to the position of each image, and attaching the texture images to the irregular triangular mesh model to obtain the oblique photographing three-dimensional model.
4. The method for evaluating flood discharge capacity of existing railway drainage facilities in a mountain area under vegetation coverage according to claim 1, wherein the method for determining the corresponding water collection area of each drainage facility comprises the steps of performing hydrologic analysis and calculation according to a digital elevation model and basic data for removing vegetation influence, dividing the water collection area of each drainage facility by combining an oblique photography three-dimensional model: preprocessing a digital elevation model for removing vegetation influence, wherein the preprocessing comprises outlier rejection, elevation smoothing filtering, grid quantity checking and resampling; Carrying out flow direction calculation of each grid unit based on the pretreated digital elevation model for removing vegetation influence, and determining a flow direction calculation result of a research area; carrying out flow calculation of each grid unit according to the flow direction calculation result, and determining the accumulated flow calculation result of all the grid units; Determining a surface runoff path according to the accumulated flow calculation result and a flow threshold value, wherein the surface runoff path is a grid unit with the accumulated flow calculation result larger than the flow threshold value; Dividing the catchment areas of the drainage facilities according to the flow direction calculation result, the surface runoff path and the oblique photography three-dimensional model, establishing a corresponding relation table of the drainage facilities and the catchment areas, and determining the catchment areas of the drainage facilities.
5. The method for evaluating flood discharge capacity of existing railway drainage facilities under vegetation cover according to claim 1, wherein the method for determining the surface runoff under different rainfall intensity conditions according to the characteristic parameters of the research area and the historical rainfall data, and determining the peak flow of each drainage facility under different rainfall intensity conditions according to the corresponding catchment area of each drainage facility comprises the following steps: Acquiring characteristic parameters of a research area; determining rainfall intensity under different rainfall reproduction period conditions according to the annual rainfall data; According to the characteristic parameters, adopting a runoff curve number model after slope correction to calculate the surface runoff under different rainfall intensity conditions; and determining the peak flow of each drainage facility under different rainfall intensity conditions according to the surface runoff under different rainfall intensity conditions and the corresponding catchment areas of each drainage facility.
6. The method for evaluating flood discharge capacity of existing railway drainage facilities in a mountain area under vegetation cover according to claim 1, wherein the determining the design flow rate of each drainage facility and the actual allowable flow rate under different blockage conditions according to the drainage facility morphological parameters and blockage conditions of the research area and basic data specifically comprises: acquiring drainage facility morphological parameters and blocking conditions of a research area; Calculating the design flow of the drainage facility by using a Manning formula according to the morphological parameters of the drainage facility; the actual allowable flow rate of the drainage facility is determined according to the design flow rate and the blockage condition of the drainage facility.
7. The method for evaluating flood discharge capacity of existing railway drainage facilities in a mountain area under vegetation cover according to claim 1, wherein the determining the drainage facility flood discharge capacity evaluation result of the research area according to the peak flow of each drainage facility under different rainfall intensity conditions, the design flow of each drainage facility and the actual allowable flow under different blockage conditions specifically comprises: Comparing the peak flow and the actual allowable flow of each drainage facility under different rainfall intensity conditions, and judging whether the drainage capacity of each drainage facility meets the requirement at present; And carrying out cross comparison on the actual allowable flow under different blocking conditions and the peak flow of each drainage facility under different rainfall intensity conditions to form a drainage facility drainage capacity evaluation table, and carrying out the drainage capacity evaluation of the existing railway drainage facilities in the mountain area.
8. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to implement the vegetation cover downhill area existing railway drainage facility flood discharge capability assessment method of any one of claims 1-7.
9. A computer-readable storage medium having stored thereon a computer program, which when executed by a processor, implements the vegetation cover downhill area existing railway drainage facility flood discharge capacity evaluation method of any one of claims 1 to 7.
10. A computer program product comprising a computer program which, when executed by a processor, implements the vegetation cover downhill area existing railway drainage facility flood discharge capability assessment method of any one of claims 1 to 7.

Description

Flood discharge capacity evaluation method, equipment, medium and product of existing railway drainage facilities in mountain area covered by vegetation Technical Field The application relates to the field of railway facility maintenance, in particular to a flood discharge capacity evaluation method, equipment, medium and product of existing railway drainage facilities in a mountain area covered by vegetation. Background At present, the total mileage of railway operation is over sixteen ten thousand kilometers, a huge railway network widely penetrates mountain areas with complex geological conditions, and is faced with various natural geological disasters for a long time, and especially the problems of erosion of ditches and water damage caused by slope catchments are most prominent. The design standard of the drainage facilities of part of railway lines, especially common speed railways with earlier construction ages, is relatively low, and the water passing capability is inherently insufficient. In addition, the surface environment and the converging conditions of the railway along the area often change obviously due to town development, land transformation and the like, so that the inadaptability of the original drainage system is further enhanced. Under the global climate change background, extreme weather events are frequent, rainfall intensity and space-time distribution show abnormal situations, so that the drainage capacity of facilities such as existing culverts, drainage pipelines and the like faces serious tests. If the existing drainage facilities cannot effectively dredge flood peak flow caused by short-time heavy rainfall, a water-flooded ballast bed can be caused, roadbed side slopes can be flushed, engineering disasters such as instability and slump of the side slopes can be even caused, and railway driving safety is seriously endangered. The prior art is mainly focused on calculation of the catchment area and the surface runoff, the relation between rainfall intensity and the design flow of the railway drainage facility is not directly established, the state and the parameters of the existing drainage facility are not considered, and whether the existing railway drainage facility can meet the drainage requirement cannot be directly judged. In addition, in the prior art, a Digital Elevation Model (DEM) adopted in the water collecting region dividing process is obtained through satellite images or simple aerial survey of an unmanned aerial vehicle, the influence of dense vegetation and micro-landform features of mountain areas is not considered, and the simulation distortion of a collecting path is easily caused. Therefore, a method for evaluating the drainage capacity of the existing railway drainage facilities in the mountain area covered by vegetation is needed to be established, whether the existing drainage facilities can meet the requirements of ditch flood drainage under the condition of extreme rainfall is evaluated, and core guarantee is provided for the safe operation of the railway in the flood season. Disclosure of Invention The application aims to provide a method, equipment, medium and product for evaluating flood discharge capacity of existing railway drainage facilities in a mountain area covered by vegetation, which can directly establish the relationship between rainfall intensity along a railway and allowable flow of the railway drainage facilities, and improve efficiency and accuracy of evaluating the flood discharge capacity of the existing railway drainage facilities in the mountain area covered by vegetation. In order to achieve the above object, the present application provides the following solutions: In a first aspect, the present application provides a method for evaluating flood discharge capacity of existing railway drainage facilities in a mountain area under vegetation coverage, where the method for evaluating flood discharge capacity of existing railway drainage facilities in a mountain area under vegetation coverage includes: Basic data of a research area is acquired, wherein the basic data comprise annual rainfall data, topographic data, satellite remote sensing image data, drainage facility data and railway line position data; According to the basic data, a digital elevation model and an oblique photography three-dimensional model for removing vegetation influence in a research area are determined by adopting an aviation measurement method; According to the digital elevation model and the basic data for removing vegetation influence, carrying out hydrologic analysis and calculation, dividing the catchment areas of the drainage facilities by combining the oblique photography three-dimensional model, and determining the catchment areas corresponding to the drainage facilities; Determining the surface runoff under different rainfall intensity conditions according to the characteristic parameters of the research area and the annual rainfall data, and determining