CN113762756A - Transformer substation accumulated water flooding calculation method based on high-precision DEM - Google Patents
Transformer substation accumulated water flooding calculation method based on high-precision DEM Download PDFInfo
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- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/30—Flood prevention; Flood or storm water management, e.g. using flood barriers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/40—Controlling or monitoring, e.g. of flood or hurricane; Forecasting, e.g. risk assessment or mapping
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
Abstract
The invention discloses a high-precision DEM-based transformer substation ponding flooding calculation method, which comprises the steps of carrying out primary cause analysis of a river system and a local terrain on ponding flooding of a transformer substation according to the river system and DEM terrain around the transformer substation; carrying out flood analysis on rivers which are possibly influenced, calculating and designing flood and flood level, and analyzing whether the transformer substation is influenced by river flood inundation according to local DEM terrain; if the transformer substation is not influenced by river flood submergence through analysis and calculation, analyzing the range of the low-lying catchment area according to the peripheral DEM terrain of the transformer substation, and calculating the waterlogging amount, the waterlogging storage volume curve, the transformer substation waterlogging submergence and the ponding depth. According to the invention, the accumulated water flooding calculation of the transformer substation is carried out through the DEM data which is easy to obtain, the accumulated water depth process of the transformer substation can be obtained in the rainfall process, and beneficial support is provided for the prediction and early warning of the flood disaster of the transformer substation.
Description
Technical Field
The invention relates to the technical field of water conservancy information, in particular to a transformer substation accumulated water flooding calculation method based on a high-precision DEM.
Background
Among various influencing factors influencing the safe operation of the transformer substation, flood disasters are one of the most uncontrollable factors, have frequent paroxysmal and serious destructiveness, and have very high risk intervention degree on the transformer substation.
At present, hydrologic and hydrodynamic coupling models are generally adopted for flood simulation research for flood risk assessment, however, a large amount of detailed data such as terrain, pipe networks, road networks, building data and the like are needed for building a two-dimensional hydrodynamic model, and the data are often difficult to collect and even have no data, so that the model cannot be built due to lack of the data in actual work.
Therefore, how to complete the transformer substation flooding risk assessment work through easily-obtained data under the condition of data shortage becomes a problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
Aiming at the technical problems in the related art, the invention provides a high-precision DEM-based method for calculating the ponding flooding of a transformer substation, which can overcome the defects of the method in the prior art.
In order to achieve the technical purpose, the technical scheme of the invention is realized as follows:
a transformer substation accumulated water flooding calculation method based on a high-precision DEM comprises the following steps:
s1: according to a river system and DEM terrain around the transformer substation, primary cause analysis of the river system and local terrain is carried out on ponding flooding of the transformer substation;
s2: carrying out flood analysis on rivers which are possibly influenced, calculating and designing flood and flood level, and analyzing whether the transformer substation is influenced by river flood inundation according to local DEM terrain;
s3: if the transformer substation is not influenced by river flood inundation through analysis and calculation, analyzing the range of a low-lying catchment area according to DEM terrain around the transformer substation, calculating the waterlogging amount of the catchment area, establishing a digital terrain model based on an ArcGIS platform according to DEM data, calculating a waterlogging storage volume curve on the surface of the terrain by using the space analysis function of GIS software, performing interpolation analysis on the waterlogging amount and the waterlogging storage volume curve with different durations to obtain the water levels with different durations, and subtracting the lowest elevation outside the enclosure of the transformer substation from the water level with different durations, namely calculating the maximum waterlogging depth of the transformer substation.
Further, in step S1, the river system analysis is to analyze the river systems around the substation, and preliminarily analyze the influence of the river on the substation according to the river design data and the relevant data of flood control and flood drainage plans.
Further, in step S1, the analysis of the local terrain is to analyze whether the substation is in the low-lying catchment area according to the peripheral DEM terrain of the substation.
Further, in step S2, the flood analysis on the river includes extracting river basin attributes, constructing a river basin hydrological model, and calibrating model parameters.
Further, the extracting of the drainage basin attribute is based on DEM data extracting of the drainage basin attribute, and comprises the processes of basic data collecting and sorting, small drainage basin dividing, river classification, small drainage basin unified coding, space topological relation establishment and drainage basin characteristic attribute obtaining.
Furthermore, the constructed watershed hydrological model is that small watersheds are divided into calculation units based on a hydrological response unit, different rainfalls are respectively input, and different runoff yield calculation parameters are adopted for each small watershed to respectively calculate the runoff yield according to the situation of vegetation, soil and elevation in each small watershed; the confluence adopts a topographic instantaneous response unit line to obtain the runoff process of the drainage basin outlet sections under different rainfall intensities, wherein a rainfall, evaporation, runoff production, confluence, river channel evolution and reservoir regulation model is involved.
Furthermore, the calibration model parameters are obtained by adjusting parameter values through a trial and error method according to the value range of the model parameters, driving the hydrological model, comparing the obtained simulation with the measured sequence, and obtaining the optimal parameter value obtained by calibration when the error is minimum.
Further, in step S2, the calculating and designing flood is to calculate and design a rainstorm process according to a local rainstorm map set or a hydrologic manual, and input the rainstorm process into a basin hydrologic model to calculate a river channel design flood process and a peak flood flow; the designed water level is calculated by adopting a constant uniform flow equation to calculate the relationship of the water level and the flow of the river channel according to the data of the river channel section, so as to obtain a flood level and flow relationship curve.
Further, in step S2, calculating whether the transformer substation is submerged by river flood, finding out the lowest elevation outside the transformer substation range according to the DEM data, and determining the difference between the designed flood level and the lowest elevation outside the transformer substation range as the maximum possible flood submerging depth of the transformer substation.
Further, in step S3, the dividing of the catchment area is performed on the area around the substation according to the DEM data and in combination with the area terrain, the river course trend, and the building enclosure.
The invention has the beneficial effects that: the accumulated water flooding calculation of the transformer substation is carried out through the DEM data which is easy to obtain, the accumulated water depth process of the transformer substation can be obtained in the rainfall process, and beneficial support is provided for the transformer substation flood disaster forecasting and early warning.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a substation water flooding calculation method based on a high-precision DEM according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention, and for the convenience of understanding the above technical solutions of the present invention, the above technical solutions of the present invention are described in detail below by specific use modes.
As shown in fig. 1, according to the high-precision DEM-based substation ponding flooding calculation method provided by the embodiment of the invention, firstly, the influence of rivers on the substation is preliminarily analyzed according to river system and DEM topographic data around the substation, and river channel design data, flood control and drainage planning and other related data; and analyzing whether the local terrain of the transformer substation is in the range of the low-lying catchment area or not according to the peripheral DEM terrain of the transformer substation.
And then calculating design flood and flood level for rivers possibly influencing the transformer substation, and analyzing whether the transformer substation is influenced by river flood inundation or not according to the local DEM terrain to perform further analysis.
For river analysis possibly influencing a transformer substation, firstly, extracting attributes of a river basin based on DEM data, wherein the attributes comprise the processes of basic data collection and arrangement, small river basin division, river classification, small river basin unified coding, space topological relation establishment, acquisition of river basin characteristic attributes (including infiltration characteristics, confluence characteristics and small river basin characteristic attribute indexes) and the like. Then, dividing small watersheds into calculation units based on the hydrological response unit, respectively inputting different rainfalls, and respectively calculating the runoff rate of each small watershed by adopting different runoff yield calculation parameters according to the conditions of vegetation, soil, elevation and the like in each small watershed; the confluence adopts a topographic instantaneous response unit line to obtain the runoff process of the drainage basin outlet sections under different rainfall intensities, wherein a rainfall, evaporation, runoff production, confluence, river channel evolution and reservoir regulation model is involved. And adjusting parameter values by a trial and error method according to the value range of the model parameters, driving the hydrological model, comparing the obtained simulation with the measured sequence, and determining the parameter value with the minimum error as the calibrated optimal parameter value.
Calculating design flood and flood level by calculating the design rainstorm process according to a local rainstorm map set or a hydrologic manual, and inputting the rainstorm process into a basin hydrologic model to calculate the river channel design flood process and the peak flow; and calculating the river water level flow relation by adopting a constant uniform flow equation according to the river section data to obtain the design flood level.
And analyzing and calculating the flood submergence of the transformer substation, namely finding out the lowest elevation outside the transformer substation range according to the DEM data, wherein the difference between the designed flood level and the lowest elevation outside the transformer substation range is the possible maximum flood submergence depth of the transformer substation.
And if the analysis and calculation result indicates that the transformer substation is not influenced by river flood inundation. And analyzing the range of the low-lying catchment area according to the peripheral DEM terrain of the transformer substation, and calculating the waterlogging amount of the catchment area and the water depth of the catchment area.
The method comprises the following steps of dividing a catchment area according to DEM data and combining area terrain, river trend, building enclosing walls and the like.
The waterlogging amount of the catchment area is calculated through the following formula:
in the formula: WP: design total flood (ten thousand m 3); phi: runoff coefficient; fi: water collection area of each block (km 2); phi i: runoff coefficient corresponding to Fi; HP: design surface storm (mm).
And then, a waterlogging storage volume curve needs to be calculated, a digital terrain model is established based on the ArcGIS platform according to DEM data, and the terrain surface is analyzed by utilizing the space analysis function of GIS software. Calculating the waterlogging submergence of the transformer substation, and performing interpolation analysis on the waterlogging water volume curves and the waterlogging storage volume curves with different durations to obtain water levels with different durations; and subtracting the lowest elevation outside the transformer substation enclosure from the water level with different durations to obtain the possible maximum accumulated water depth of the transformer substation.
In conclusion, by means of the technical scheme, the substation waterlogging depth process can be obtained in the rainfall process by performing substation waterlogging calculation through the DEM data which is easy to obtain, and beneficial support is provided for forecasting and early warning of the flood disaster of the substation.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A transformer substation accumulated water flooding calculation method based on a high-precision DEM is characterized by comprising the following steps:
s1, performing primary cause analysis of the river system and the local topography on ponding flooding of the transformer substation according to the river system and the DEM topography around the transformer substation;
s2, carrying out flood analysis on the rivers which are likely to be influenced, calculating and designing the flood and the flood level, and analyzing whether the transformer substation is influenced by the flood inundation of the river according to the local DEM terrain;
s3, if the transformer substation is analyzed and calculated to be not influenced by river flood submergence, analyzing the range of a low-lying catchment area according to DEM terrain around the transformer substation, calculating the waterlogging amount of the catchment area, establishing a digital terrain model based on an ArcGIS platform according to DEM data, calculating a waterlogging storage volume curve of the terrain surface by using the space analysis function of GIS software, performing interpolation analysis on the waterlogging amount and the waterlogging storage volume curve for different durations to obtain water levels for different durations, and subtracting the lowest elevation outside the enclosing wall of the transformer substation from the water level for different durations to calculate the maximum waterlogging depth of the transformer substation.
2. The high-precision DEM-based substation ponding flooding calculation method according to claim 1, wherein in the step S1, the river system analysis is to analyze river systems around the substation, and preliminarily analyze the influence of rivers on the substation according to river channel design data and relevant data of flood control and drainage plans.
3. A high accuracy DEM based substation ponding flooding calculation method according to claim 1 wherein in step S1 the analysis of local terrain is based on substation perimeter DEM terrain to analyze whether the substation is within low lying catchment areas.
4. The high-precision DEM-based substation water flooding calculation method according to claim 1, wherein in step S2, the flood analysis of the river comprises extracting river basin properties, constructing a river basin hydrological model and calibrating model parameters.
5. The high-precision DEM-based substation water flooding calculation method according to claim 4, characterized in that the extraction of the drainage basin attributes is based on DEM data extraction of the drainage basin attributes, and comprises the processes of basic data collection and sorting, small drainage basin division, river classification, small drainage basin unified coding, space topological relation establishment and drainage basin characteristic attribute acquisition.
6. The method for calculating the ponding flooding of the transformer substation based on the high-precision DEM as claimed in claim 4, wherein the constructed watershed hydrological model is that small watersheds are divided into calculation units based on a hydrological response unit, different rainfall is respectively input, and different runoff yield calculation parameters are respectively adopted for each small watershed to calculate the runoff yield according to the situation of vegetation, soil and elevation in each small watershed; the confluence adopts a topographic instantaneous response unit line to obtain the runoff process of the drainage basin outlet sections under different rainfall intensities, wherein a rainfall, evaporation, runoff production, confluence, river channel evolution and reservoir regulation model is involved.
7. The high-precision DEM-based substation ponding flooding calculation method according to claim 4, characterized in that the calibration model parameters are obtained by adjusting parameter values by a trial and error method according to a model parameter value range, driving a hydrological model, comparing the obtained simulation with an actually measured sequence, and obtaining the optimal parameter value obtained by calibration when the error is the smallest.
8. The high-precision DEM-based substation ponding flooding calculation method according to claim 1, wherein in step S2, the calculated design flood is a calculated design rainstorm process according to a local rainstorm map set or a hydrologic manual, and the calculated design flood is input into a basin hydrologic model to calculate a river channel design flood process and a flood peak flow; the designed water level is calculated by adopting a constant uniform flow equation to calculate the relationship of the water level and the flow of the river channel according to the data of the river channel section, so as to obtain a flood level and flow relationship curve.
9. The method for calculating the ponding submergence of the transformer substation based on the high-precision DEM is characterized in that in the step S2, whether the transformer substation is submerged by river flood is calculated, the lowest elevation outside the range of the transformer substation is found according to the DEM data, and the difference between the designed flood level and the lowest elevation outside the range of the transformer substation is the maximum possible flood submergence depth of the transformer substation.
10. The method for calculating the station water flooding based on the high-precision DEM as claimed in claim 1, wherein in the step S3, the step of dividing the catchment area is to divide the catchment area of the peripheral area of the station according to the DEM data and by combining the terrain, the trend of the river and the wall of the building.
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