Modification of ERA5 wind farm methods, devices, equipment, media and program products

Abstract

The present application discloses a method, apparatus, device, medium and program product for correcting an ERA5 wind field, and relates to the technical field of meteorological data reconstruction, including: relocating the typhoon center position in the ERA5 original wind field based on historical typhoon trajectory data; dividing the typhoon activity area into an ocean region, a land region and a nearshore region according to the straight-line distance between the typhoon center position and the coastline; reconstructing the ERA5 original wind field of each region using different wind field reconstruction strategies in the ocean region, the land region and the nearshore region to obtain a new corrected wind field of each region; and embedding the new corrected wind field of each region into the ERA5 original wind field to obtain a corrected ERA5 target wind field.

Description

Technical Field

[0001] The present application relates to the technical field of meteorological data reconstruction, and in particular to a method for correcting an ERA5 wind farm, a device for correcting an ERA5 wind farm, equipment for correcting an ERA5 wind farm, a storage medium, and a computer program product. Background Art

[0002] Existing typhoon datasets inaccurately depict key structural features such as maximum wind speed radius and wind field asymmetry, leading to underestimation of typhoon peak wind speeds and biased disaster prevention assessments. Traditional correction methods (such as traditional parameterized models, proportional correction methods, statistical-dynamic hybrid methods, and machine learning-based models) have limitations in simulating terrain effects and data assimilation, resulting in poor positional adaptability and low restoration accuracy in reconstructing typhoon wind fields. Summary of the Invention

[0003] The main purpose of this application is to provide a method for correcting ERA5 wind farms, a device for correcting ERA5 wind farms, equipment for correcting ERA5 wind farms, a storage medium and a computer program product, aiming to solve the technical problems of poor adaptability and low restoration accuracy of traditional correction methods in reconstructing typhoon wind farms.

[0004] To achieve the above objectives, this application proposes a method for correcting an ERA5 wind farm, the method comprising:

[0005] Based on historical typhoon track data, the typhoon center position in the ERA5 original wind field is relocated;

[0006] The typhoon activity area is divided into ocean area, land area and nearshore area according to the straight-line distance between the typhoon center and the coastline;

[0007] Reconstruct the ERA5 original wind fields of the ocean region, the land region, and the nearshore region using different wind field reconstruction strategies to obtain new revised wind fields of the respective regions;

[0008] The new revised wind fields of the respective regions are embedded into the ERA5 original wind fields to obtain the revised ERA5 target wind fields.

[0009] In one embodiment, the step of reconstructing the ERA5 original wind field in the ocean region to obtain a new revised wind field includes:

[0010] An idealized typhoon model is constructed, and the ERA5 original wind field and the idealized typhoon model are weightedly fused to obtain an ideal corrected wind field, which is used as a new corrected wind field in the ocean region.

[0011] In one embodiment, the step of reconstructing the ERA5 original wind field in the land area to obtain a new revised wind field includes:

[0012] Determine the first maximum wind speed over the land area in the historical typhoon track data, and calculate the second maximum wind speed of the typhoon in the new ERA5 original wind field corresponding to the relocated typhoon center position;

[0013] Calculating a wind speed ratio based on the first maximum wind speed and the second maximum wind speed;

[0014] The ERA5 original wind field is corrected according to the wind speed ratio to obtain a proportionally corrected wind field, and the proportionally corrected wind field is used as a new corrected wind field for the land area.

[0015] In one embodiment, the step of reconstructing the ERA5 original wind field in the nearshore area to obtain a new revised wind field includes:

[0016] The weight is calculated based on the straight-line distance between the typhoon center and the coastline and the preset straight-line distance;

[0017] The new corrected wind field in the ocean region and the new corrected wind field in the land region are fused according to the weights to obtain a fused corrected wind field, and the fused corrected wind field is used as a new corrected wind field in the nearshore region.

[0018] In one embodiment, the step of relocating the typhoon center position in the ERA5 original wind field based on historical typhoon track data includes:

[0019] Taking the old typhoon center position of the ERA5 original wind field as the center, select the first grid area under the first preset longitude and the first preset latitude;

[0020] The relative vorticity in each grid in the first grid area is calculated, and the position where the typhoon wind speed is the smallest in the first grid area and the relative vorticity is greater than the average relative vorticity of the first grid area is taken as the new typhoon center position in the ERA5 original wind field.

[0021] In one embodiment, before the step of embedding the new revised wind field of each region into the ERA5 original wind field to obtain the revised ERA5 target wind field, the step includes:

[0022] Using typhoon observation data at the same time and location, wherein the typhoon observation data includes historical observation data of historical typhoons or real-time observation data of current typhoons, to evaluate the ERA5 original wind field and the new revised wind field of the respective regions;

[0023] If the evaluation is passed, the step of embedding the new revised wind field of each region into the ERA5 original wind field to obtain a revised ERA5 target wind field is performed.

[0024] In addition, to achieve the above objectives, the present application also proposes a modified ERA5 wind farm device, the modified ERA5 wind farm device comprising:

[0025] Positioning module, used to relocate the typhoon center position in the ERA5 original wind field based on historical typhoon track data;

[0026] A division module, configured to divide the typhoon activity area into an ocean area, a land area, and a nearshore area according to the straight-line distance between the typhoon center and the coastline;

[0027] A reconstruction module is used to reconstruct the ERA5 original wind field of the ocean region, the land region and the nearshore region using different wind field reconstruction strategies to obtain a new revised wind field of the respective region;

[0028] The embedding module is used to embed the new revised wind field of each region into the ERA5 original wind field to obtain the revised ERA5 target wind field.

[0029] In addition, to achieve the above-mentioned objectives, the present application also proposes a modified ERA5 wind farm device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the modified ERA5 wind farm method as described above.

[0030] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium and stores a computer program. When the computer program is executed by a processor, the steps of the modified ERA5 wind farm method as described above are implemented.

[0031] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the steps of the method for modifying the ERA5 wind farm as described above.

[0032] One or more technical solutions proposed in this application have at least the following technical effects:

[0033] In view of the limitations of existing correction methods in simulating terrain effects and data assimilation, and the problems of poor adaptability and low restoration accuracy of reconstructed typhoon wind fields, this application relocates the typhoon center position in the ERA5 original wind field based on historical typhoon trajectory data, and then designs different wind field reconstruction strategies based on the terrain impact of typhoons in different typhoon activity areas by dividing the typhoon activity areas (ocean area, land area, near-shore area), overcoming the limitations of traditional single methods in adaptability to complex terrain and low restoration accuracy of reconstructed wind fields; finally, the regionally corrected wind fields are embedded in the ERA5 original wind field, so that the corrected ERA5 target wind field data has stronger adaptability and higher accuracy, and has higher reliability and practicality in disaster prevention assessment and climate research. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0036] Figure 1 A flow chart illustrating an embodiment of a method for modifying an ERA5 wind farm in this application;

[0037] Figure 2 Schematic diagram of the ideal corrected wind field provided for the ERA5 wind field method correction in this application;

[0038] Figure 3 Schematic diagram of the comparison of the datasets provided for the modification of the ERA5 wind field method in this application;

[0039] Figure 4 Schematic diagram comparing the land station data provided for the revised ERA5 wind field method in this application with the wind fields during the typhoon event.

[0040] Figure 5 A schematic diagram comparing typhoon wind speed profiles in the ocean and nearshore regions at different times, provided for the revised ERA5 wind field method in this application;

[0041] Figure 6 The overall flow chart provided for the revised ERA5 wind farm methodology for this application;

[0042] Figure 7 Modify the modular structure diagram of the ERA5 wind farm device for this application;

[0043] Figure 8 Schematic diagram of the equipment structure of the hardware operating environment involved in modifying the ERA5 wind farm method for this application.

[0044] The purpose, features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] It should be understood that the specific embodiments described herein are merely used to explain the technical solutions of the present application and are not intended to limit the present application.

[0046] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0047] Typhoons are among the most destructive natural disasters, often causing severe socioeconomic impacts, including devastating damage to infrastructure in affected areas and enormous economic losses. However, existing typhoon datasets generally suffer from low spatial resolution, making it difficult to accurately characterize key structural features such as the maximum wind speed radius and wind field asymmetry. This limitation often leads to underestimation of typhoon peak wind speeds and a lack of clarity about the storm's core structure, which in turn hinders the scientific assessment and deployment of disaster prevention and post-disaster reconstruction efforts in coastal areas.

[0048] Against the backdrop of global warming, the intensity, frequency, and structural characteristics of typhoons are becoming more complex and variable. This places higher demands on the accurate representation of wind fields in climate models and urgently requires a deeper understanding of their interactions with ocean and deep processes. Currently, methods for reconstructing typhoon wind fields include traditional parameterized models, proportional correction methods, statistical-dynamic hybrid methods, and machine learning-based models. While parameterized models offer theoretical simplicity, they have significant limitations in simulating topographic influences, particularly for landfalling typhoons. Proportional correction methods can improve the consistency between model output and observational data to a certain extent, but often over-scale the core wind field compared to satellite-based wind speed estimates. Statistical-dynamic hybrid methods utilize data assimilation techniques to improve wind field estimation accuracy, but their applicability is still limited by the uncertainty of observational data. Machine learning-based models show great potential in improving forecast accuracy, but their application and promotion remain challenging due to the limited availability of high-quality training data and the inherent complexity of typhoon dynamics.

[0049] Given that typhoon intensity and structural characteristics are currently influenced by multiple factors, wind field reconstruction remains a challenging task. Therefore, there is an urgent need to develop a globally adaptable and highly accurate wind field reconstruction method to more accurately characterize typhoon wind field structures and provide strong support for disaster prevention and control and climate research.

[0050] This application relocates the typhoon center position in the ERA5 original wind field based on historical typhoon trajectory data, and then designs different wind field reconstruction strategies based on the topographic impact of typhoon activity areas on typhoons in different typhoon activity areas by dividing the typhoon activity areas (ocean area, land area, near-shore area), overcoming the limitations of traditional single methods in adaptability to complex terrain and the low accuracy of reconstructed wind field restoration; finally, the regionally corrected wind field is embedded in the ERA5 original wind field, making the corrected ERA5 target wind field data more adaptable and accurate, and more reliable and practical in disaster prevention assessment and climate research.

[0051] It should be noted that the execution subject of this embodiment can be a modified ERA5 wind farm device, or a computing service device with data processing, network communication, and program execution capabilities, such as a tablet computer, personal computer, mobile phone, or other electronic device or processor capable of implementing the aforementioned functions. This embodiment and the following embodiments will be described below using a modified ERA5 wind farm device as an example.

[0052] Based on this, the embodiment of the present application provides a method for correcting the ERA5 wind farm, referring to Figure 1 , Figure 1 This is a flow chart of an embodiment of the modified ERA5 wind farm method of this application.

[0053] In this embodiment, the method for correcting the ERA5 wind farm includes steps S10 to S40:

[0054] Step S10, relocating the typhoon center position in the ERA5 original wind field based on historical typhoon track data;

[0055] It should be noted that historical typhoon track data includes information such as typhoon longitude, typhoon latitude, typhoon position at different times, maximum wind speed, maximum wind speed radius, and the straight-line distance between the typhoon position and the coastline. For example, historical typhoon track data can be provided by IBTrACS. The ERA5 original wind field is a high-resolution global meteorological reanalysis dataset provided by the European Centre for Medium-Range Weather Forecasts.

[0056] Since the measured typhoon center position deviates from the typhoon center position in the ERA5 original wind field, it is necessary to relocate the typhoon center position in the ERA5 original wind field. The typhoon center position in the ERA5 original wind field can be relocated using historical typhoon track data.

[0057] In one embodiment, step S10 includes steps B10 to B20:

[0058] Step B10, taking the old typhoon center position of the ERA5 original wind field as the center, selecting a first grid area at a first preset longitude and a first preset latitude;

[0059] It should be noted that this implementation method corrects the old typhoon center position in the ERA5 original wind field. The first preset longitude and the first preset latitude refer to a pre-set longitude and latitude range, such as a 10°×10° grid area, that is, based on the original typhoon center position, extending a certain span to the east, west, south and north, such as 5°.

[0060] Step B20, calculate the relative vorticity in each grid in the first grid area, and take the position in the first grid area where the typhoon wind speed is the minimum and the relative vorticity is greater than the average relative vorticity of the first grid area as the new typhoon center position in the ERA5 original wind field.

[0061] It should be noted that within the first grid area, the relative vorticity of each grid point is first calculated, where relative vorticity represents an indicator of the intensity of air rotation. The location within the first grid area where the typhoon wind speed is the lowest and the relative vorticity is greater than the average relative vorticity of the first grid area is used as the new typhoon center position in the ERA5 wind field. The location with the lowest typhoon wind speed is selected because the wind speed in the typhoon eye region is usually the lowest, and the location with a relative vorticity higher than the regional average is selected because the typhoon core has significant rotation characteristics and a higher vorticity value.

[0062] In this implementation, these two conditions eliminate potential positioning biases in the ERA5 raw data, allowing for a more accurate pinpointing of the typhoon's true center. This method, combining dynamic and thermal characteristics, significantly improves the reliability of characterizing the typhoon's core structure.

[0063] Step S20, dividing the typhoon activity area into ocean area, land area and nearshore area according to the straight-line distance between the typhoon center and the coastline;

[0064] It should be noted that the wind field structure of typhoons in different geographical environments varies significantly. Therefore, the activity area needs to be divided into three categories based on the straight-line distance between the typhoon center and the coastline: ocean area, land area and nearshore area.

[0065] For example, the specific division criteria may be: the straight-line distance between the ocean area and the coastline is greater than 100 km, the straight-line distance between the land area and the coastline is 0 km, and the straight-line distance between the nearshore area and the coastline is between 0 km and 100 km.

[0066] Step S30, reconstructing the ERA5 original wind fields of the ocean region, the land region, and the nearshore region using different wind field reconstruction strategies to obtain new revised wind fields of the respective regions;

[0067] It should be noted that wind fields are reconstructed over the ocean, land, and nearshore regions to generate a revised wind field. This regional reconstruction preserves the large-scale meteorological characteristics of ERA5 while correcting the underestimated wind speed in the typhoon's core area.

[0068] Step S40: embed the new revised wind field of each region into the ERA5 original wind field to obtain a revised ERA5 target wind field.

[0069] It should be noted that the newly reconstructed revised wind fields for each region are spatially superimposed onto the original ERA5 wind fields to form a globally unified revised dataset. The revised ERA5 target wind fields retain the overall meteorological framework of the original data while significantly improving the accuracy of key parameters such as maximum typhoon wind speed and maximum wind radius by incorporating the newly reconstructed revised wind fields for each region. This improves the accuracy of these key parameters, such as maximum wind speed and maximum wind radius, and supports applications such as disaster prevention and early warning, and climate research.

[0070] In another embodiment, before step S40, the following steps are included:

[0071] Use typhoon observation data at the same time and location, where the typhoon observation data includes historical observation data of historical typhoons or real-time observation data of current typhoons, to evaluate the ERA5 original wind field and the new revised wind field for each region;

[0072] If the evaluation is passed, the step of embedding the new revised wind field of each region into the ERA5 original wind field is performed to obtain the revised ERA5 target wind field.

[0073] It should be noted that typhoon observation data of the same time and location are extracted, where the typhoon observation data can be airborne remote sensing, satellite inversion, meteorological station measurements, etc. The typhoon observation data are compared with the ERA5 original wind field prediction data and the new revised wind field prediction data of each region, and the bias, root mean square error (RMSE) and correlation coefficient (R) are calculated to evaluate whether the new revised wind field has a significant improvement compared with the ERA5 original wind field.

[0074] Specifically, the following formula can be used for calculation:

[0075] ；

[0076] ；

[0077] ;

[0078] in, is the true value, i.e. historical observation data or actual observation data, is the average value of historical observation data or real-time observation data, The typhoon forecast data of the original wind field of ERA5 or the typhoon forecast data of the new revised wind field, is the average value of the typhoon forecast data of the new revised wind field, and N is the number of samples.

[0079] Passing the evaluation can mean that: the Bias, RMSE and R of the new revised wind field are better than the Bias, RMSE and R of the ERA5 original wind field; or at least two indicators are significantly improved.

[0080] In this implementation, the new revised wind field is quantitatively verified using typhoon observation data at the same time and space to ensure the scientific nature and reliability of the new revised wind field. The evaluated revised wind field will cover the ERA5 original wind field and retain the original meteorological characteristics of the surrounding environment field. The revised ERA5 target wind field will significantly improve the accuracy of restoring the typhoon's core dynamic structure while retaining the large-scale meteorological framework, providing more reliable typhoon trajectory prediction for disaster prevention and warning.

[0081] In this embodiment, the typhoon center position in the ERA5 original wind field is relocated based on historical typhoon trajectory data. Then, by dividing the typhoon activity areas (ocean area, land area, near-shore area), different wind field reconstruction strategies are designed according to the topographical impact of different typhoon activity areas on typhoons, overcoming the limitations of the traditional single method in adaptability to complex terrain and the low accuracy of reconstructed wind field restoration. Finally, the regionally corrected wind field is embedded in the ERA5 original wind field, making the corrected ERA5 target wind field data more adaptable and accurate, and having higher reliability and practicality in disaster prevention assessment and climate research.

[0082] Based on the above embodiments of the present application, in another embodiment of the present application, the same or similar contents as those in the above embodiments can be referred to the above introduction and will not be repeated later.

[0083] The steps to reconstruct the ERA5 original wind field in the ocean region and obtain the new revised wind field include:

[0084] An idealized typhoon model is constructed, and the ERA5 original wind field and the idealized typhoon model are weightedly fused to obtain the ideal corrected wind field, which is used as the new corrected wind field in the ocean region.

[0085] It should be noted that the wind speed profile of the idealized typhoon model is derived based on the ideal Holland typhoon model and the gradient wind balance theory. The expression of the idealized typhoon model is:

[0086] ;

[0087] ;

[0088] in, Representative radius The gradient wind speed at , where r is the radial distance extending from the relocated typhoon center position as the extreme point, is the maximum wind speed in the ocean region in the historical typhoon track data, is the maximum wind speed radius, is the latitude of the relocated typhoon center. are the model parameters of the idealized typhoon model, Determines the trend change of wind profile.

[0089] Introducing weight coefficient , the ERA5 original wind field and the idealized typhoon model are fused; in addition, considering the influence of the wind field structure asymmetry caused by the typhoon moving speed, the typhoon moving speed is added in the fusion, and the ideal corrected wind field expression after fusion is:

[0090] ;

[0091] ;

[0092] ;

[0093] in, represents the ideal corrected wind field; This is the original wind farm of ERA5; is an idealized typhoon model; The moving speed of the typhoon whose center has been relocated; is the weight coefficient; is the distance parameter, which is used to estimate the ratio of the idealized typhoon model to the ERA5 original wind field at different distances from the typhoon center; is the maximum wind speed radius; r is the radial distance extending from the relocated typhoon center as the pole.

[0094] It is understood that the implementation of the ocean region wind farm reconstruction strategy is not limited to the above embodiment. The ocean region can also use methods such as the classic Holland model and machine learning models to reconstruct the wind farm and modify the original ERA5 wind farm. This embodiment does not limit the strategy adopted when reconstructing the wind farm in the ocean region.

[0095] In addition, it should be noted that for tropical depressions and tropical storms, adding Instead, it affects the simulation effect of wind field reconstruction. When the speed is lower than 33m / s, Set to 0.

[0096] In this embodiment, since the idealized typhoon model is based on gradient wind balance, it can accurately describe the axisymmetric wind field structure of the typhoon core. The ERA5 original wind field can provide large-scale environmental field data. The ERA5 original wind field and the idealized typhoon model are weighted and fused. The inner core area is dominated by the idealized typhoon model, and the periphery gradually transitions to the ERA5 original wind field. This can solve the problem of systematic underestimation of ERA5 in the typhoon core area and significantly improve the characterization accuracy of the typhoon core dynamic structure in the ocean area.

[0097] like Figure 2 As shown, Figure 2 This is a schematic diagram of the ideal corrected wind field obtained by weighted fusion of the ERA5 original wind field and the idealized typhoon model.

[0098] Figure 2 (a) in the figure represents the original typhoon wind field in ERA5 ( The wind speed in the inner area is too small and does not match the actual wind speed, which means that the ERA5 original wind field needs to be improved in expressing the characteristics of the inner area of ​​the typhoon). Figure 2 (b) represents the idealized typhoon model ( ).from Figure 2 As can be seen in (c), the ideal corrected wind field can more realistically restore the inner structure of the typhoon.

[0099] In one embodiment, the step of reconstructing the ERA5 original wind field in the land area to obtain a new revised wind field includes steps D10 to D30:

[0100] Step D10, determining the first maximum wind speed in the land area in the historical typhoon track data, and calculating the second maximum wind speed of the typhoon in the new ERA5 original wind field corresponding to the relocated typhoon center position;

[0101] It should be noted that the first maximum wind speed in the land area is determined based on historical typhoon track data. , among which, since the existing correction method does not take the terrain effect into account, the first maximum wind speed in the land area determined from the historical typhoon track data is the same as the maximum wind speed in the ocean area, both of which are .

[0102] For example, in the new ERA5 original wind field, the calculation method of the second maximum wind speed of the typhoon can be:

[0103] Taking the relocated typhoon center as the center, selecting a second grid area at a second preset longitude and a second preset latitude;

[0104] The typhoon wind speeds in the second grid area are sorted, and the average value of the typhoon wind speeds within a preset range is used as the second maximum wind speed of the typhoon in the new ERA5 original wind field.

[0105] It should be noted that a grid area is delineated around the corrected typhoon center, and the "second preset longitude" and "second preset latitude" refer to the pre-set longitude and latitude span, such as a 4°×4° grid area, that is, a grid area is formed by taking the relocated typhoon center as the origin and extending 2° to the east and west, and 2° to the south and north.

[0106] Within the selected grid, all wind speed values ​​within the area are first sorted from high to low. The average wind speed within a preset range is then calculated. For example, the average of the top 5% can be used as the maximum typhoon wind speed in the ERA5 wind field. For example, if there are 100 wind speed data points in the grid, the average of the top 5 wind speed values ​​is taken and used as the second maximum typhoon wind speed in the new ERA5 original wind field.

[0107] Step D20, calculating a wind speed ratio based on the first maximum wind speed and the second maximum wind speed;

[0108] It should be noted that the wind speed ratio can be calculated as follows:

[0109] ;in, Indicates the wind speed ratio; Indicates the first maximum wind speed; Indicates the second highest wind speed.

[0110] Step D30: correcting the ERA5 original wind field according to the wind speed ratio to obtain a proportionally corrected wind field, and using the proportionally corrected wind field as a new corrected wind field for the land area.

[0111] It should be noted that the proportional correction wind field can be calculated as follows:

[0112] ;

[0113] in, represents the scale-corrected wind field; This is the original wind farm of ERA5; is the maximum wind speed radius.

[0114] It is understood that the implementation of the wind farm reconstruction strategy for land areas is not limited to the above embodiment. A deep neural network method trained with site observation data can also be used to reconstruct the wind farm in land areas and modify the original ERA5 wind farm. This embodiment does not limit the strategy used for wind farm reconstruction in land areas.

[0115] In this embodiment, the maximum wind speed measured in the land area, i.e., the first maximum wind speed, is obtained through historical typhoon trajectory data, and the wind speed ratio is calculated by comparing it with the maximum wind speed of the corresponding typhoon in the relocated ERA5 wind field, i.e., the second maximum wind speed. The ERA5 original wind field is segmentedly corrected according to the wind speed ratio. The wind speed in the inner core area, i.e., the area less than the maximum wind speed radius from the typhoon center, is amplified according to the wind speed ratio, and the outer area gradually transitions to the value in the ERA5 original wind field, which not only improves the accuracy of the inner core wind speed, but also retains the stability of the ERA5 large-scale environmental field. By retaining the asymmetric characteristics of the wind field in ERA5, the proportionally corrected wind field can still reflect the actual wind speed distribution in complex land areas and can more accurately capture the wind speed extremes and attenuation laws.

[0116] In another embodiment, the steps of reconstructing the ERA5 original wind field in the nearshore area to obtain a new revised wind field include:

[0117] The weight is calculated based on the straight-line distance between the typhoon center and the coastline and the preset straight-line distance;

[0118] The new corrected wind field in the ocean area and the new corrected wind field in the land area are fused according to the weights to obtain a fused corrected wind field, which is used as the new corrected wind field in the nearshore area.

[0119] It should be noted that the weight The calculation method is:

[0120] ;

[0121] in, Indicates the straight-line distance between the typhoon center and the coastline. Indicates the preset straight-line distance, set to 100 km (100 km is the average radius of the global level 7 wind circle), representing the location where the typhoon begins to be affected by the terrain.

[0122] The expression of the fused corrected wind field is:

[0123] ;

[0124] in, represents the fused corrected wind field; represents the ideal corrected wind field; Represents the scale-corrected wind field.

[0125] In order to address the problem that nearshore areas have both ocean and land characteristics and that traditional single correction methods are difficult to balance, in this embodiment, the weight coefficient is calculated based on the straight-line distance between the typhoon center and the coastline. The closer to the coastline, the higher the weight of the corrected wind field in the land area, and the weight of the ocean area is correspondingly reduced, retaining the wind speed attenuation caused by terrain friction and ensuring a smooth connection between the land and sea transition zone; reducing the jump problem of traditional methods in the transition zone, and improving the prediction accuracy of the nearshore area.

[0126] It is understood that the implementation of the nearshore wind farm reconstruction strategy is not limited to the above embodiment. Nearshore wind farm reconstruction can also be performed using machine learning and other methods to modify the original ERA5 wind farm. This embodiment does not limit the strategy used to reconstruct the nearshore wind farm.

[0127] Since most existing satellite products have significantly underestimated the typhoon wind field size, according to Figure 3 The SMAP and WindSat shown in the figure are schematic diagrams comparing the satellite image dataset and the IBTrACS measured typhoon track record dataset. It can be seen that the SMAP and WindSat datasets are suitable for evaluating the revised ERA5 target wind field.

[0128] SMAP and WindSat are satellite image datasets, IBTrACS is a dataset of measured typhoon tracks, MWS is the maximum wind speed, RMW is the maximum wind speed radius, R is the correlation coefficient, RMSE is the root mean square error, and Bias is the bias.

[0129] exist Figure 3 In (a), the horizontal axis represents IBTrACS MWS, which is the MWS extracted from the IBTrACS typhoon track record data set, in m / s (meters per second); the vertical axis represents SMAP MWS, which is the MWS extracted from SMAP, in m / s (meters per second). Figure 3 As shown in (a), the MWS (maximum wind speed) parameter extracted from SMAP compares well with the IBTrACS typhoon track data set, with an R ratio of 0.91, indicating a strong correlation between SMAP and the measured typhoon track data. However, the Bias of -4.03 m / s indicates a slight underestimation. The RMSE of 6.40 m / s is significantly lower than that of other satellite products, demonstrating the high reliability of SMAP in typhoon wind speed retrieval.

[0130] exist Figure 3In (c), the horizontal axis represents IBTrACS MWS, which is the MWS extracted from the IBTrACS typhoon track record data set, in m / s (meters per second); the vertical axis represents WindSat MWS, which is the MWS extracted from WindSat, in m / s (meters per second). Figure 3 As can be seen from (c), the RMW (maximum wind speed radius) parameters extracted from WindSat are compared with the IBTrACS measured typhoon track record dataset, with R=0.75 and RMSE=8.83, indicating that the WindSat dataset has a high degree of consistency with the measured data and is suitable for typhoon structure analysis.

[0131] exist Figure 3 In (b), the horizontal axis represents IBTrACS RMW, i.e., RMW extracted from the IBTrACS typhoon track record dataset, in km (kilometers); the vertical axis represents SMAP RMW, i.e., RMW extracted from SMAP, in km (kilometers). Figure 3 In (d), the horizontal axis represents IBTrACS RMW, i.e., RMW extracted from the IBTrACS typhoon track record dataset, in km (kilometers); the vertical axis represents WindSat RMW, i.e., RMW extracted from WindSat, in km (kilometers). Figure 3 In (b), R=19.08 can be seen from the SMAP to extract the RMW (maximum wind speed radius) parameter. Figure 3 In (d), R=12.63 shows that the MWS (maximum wind speed) parameters extracted from WindSat are overestimated.

[0132] But overall, from Figure 3 Judging from the data, despite the limitations of the SMAP and WindSat datasets, their performance in key parameters (such as SMAP's MWS and WindSat's RMW) is significantly better than other satellite products, and can provide effective support for the comparison and evaluation of global typhoon corrected wind fields.

[0133] Since the terrain will affect the typhoon, according to Figure 4 The schematic diagram showing the comparison between the land station data and the wind fields during the typhoon event shows that using an idealized typhoon model in the land area tends to overestimate the typhoon wind speed and result in errors; while using a proportionally corrected wind field in the land area can be closer to the station data results.

[0134] Figure 4In the expression, “Station” refers to the land station data, “ERA5” refers to the ERA5 original wind field, “ERA5-W” refers to the idealized typhoon model, and “RE-ERA5” refers to the ERA5 target wind field after correction in the land area, i.e., the proportionally corrected wind field.

[0135] exist Figure 4 In the chart, the horizontal axis represents the date, and the vertical axis represents the wind speed in m / s (meters per second). Figure 4 As can be seen from (a)-(d) in the figure, the ERA5-W curve is generally higher than the Station measured data, indicating that the idealized typhoon model overestimates the wind speed in the land area; the RE-ERA5 curve is highly consistent with the Station data, indicating that the proportional correction wind field effectively retains the wind field asymmetry under the influence of terrain by dynamically adjusting the ERA5 wind speed ratio; the ERA5 curve is generally lower than the Station data, indicating that the ERA5 original wind field underestimates the typhoon intensity.

[0136] from Figure 4 From the above, it can be seen that during the typhoon landing process, the proportional correction wind field (RE-ERA5) dynamically adjusts the wind speed distribution by combining the measured data, which is significantly better than the idealized typhoon model and the ERA5 original wind field. It can provide high-precision wind field input for wind disaster assessment and wind-resistant design of buildings in coastal cities, and provide a basis for improving the land surface parameterization of the typhoon model.

[0137] Figure 5 Schematic diagram showing the comparison of typhoon wind speed profiles in the ocean area and nearshore area at different times.

[0138] Figure 5 SFMR represents airborne remote sensing measured data, ERA5 represents the ERA5 original wind field, and RE-ERA5 represents the revised ERA5 target wind field in the ocean and nearshore areas.

[0139] exist Figure 5 In (a)-(f), the horizontal axis represents latitude and the vertical axis represents wind speed in m / s (meters per second). Figure 5 In (a)-(f), it can be seen that the ERA5 curve is significantly lower than the SFMR in the typhoon core area, and the typhoon inner area range of ERA5 is unreasonably expanded, while the RE-ERA5 curve is highly consistent with the SFMA in the typhoon core area, and the inner area range is consistent with the SFMR.

[0140] exist Figure 5 In (g), the horizontal axis represents SFMR Wind, i.e., the wind speed in the airborne remote sensing data, in m / s (meters per second), and the vertical axis represents ERA5 Wind, i.e., the wind speed in the ERA5 original wind field, in m / s (meters per second). Figure 5(g) indicates the use of airborne remote sensing data to evaluate the ERA5 original wind field. Bias = -11.22: This indicates that ERA5 systematically underestimates typhoon wind speeds. RMSE = 15.67: The overall prediction error of the ERA5 original wind field is large. R = 0.65: The correlation is low, indicating that the ERA5 original wind field cannot accurately reflect the trend of wind speed changes.

[0141] exist Figure 5 In (h), the horizontal axis represents SFMR Wind, i.e., the wind speed in the airborne remote sensing data, in m / s (meters per second); the vertical axis represents Re-ERA5 Wind, i.e., the wind speed in the ERA5 target wind field after correction in the ocean and nearshore areas, in m / s (meters per second). Figure 5 (h) in the figure indicates the evaluation of the revised ERA5 target wind field using airborne remote sensing data. Bias = -0.95: indicating that the systematic bias is almost eliminated after correction; RMSE = 8.41 m / s: indicating that the error is reduced by 46%, and the revised ERA5 target wind field significantly improves the prediction accuracy of typhoon tracks; R = 0.83: high correlation, indicating that the revised ERA5 target wind field can capture the dynamic characteristics of typhoons.

[0142] from Figure 5 From the above, it can be seen that the revised ERA5 target wind field (RE-ERA5) significantly improves the accuracy of restoring the typhoon core dynamic structure while retaining the large-scale meteorological characteristics, providing a more reliable data basis for meteorological research, disaster prevention and mitigation, and climate models.

[0143] For example, to help understand the implementation process of the modified ERA5 wind farm method obtained by combining this embodiment with the above embodiments, please refer to Figure 6 , Figure 6 An overall flow chart of the ERA5 wind farm correction method is provided, specifically:

[0144] First, based on historical typhoon trajectory data, the typhoon center position was relocated in the ERA5 original wind field, and then the maximum wind speed was recalculated; according to the straight-line distance between the typhoon center position and the coastline, the typhoon activity area was divided into ocean area, land area and nearshore area. Among them, the straight-line distance between the ocean area and the coastline is greater than 100km, the straight-line distance between the land area and the coastline is 0km, and the straight-line distance between the nearshore area and the coastline is between 0km and 100km.

[0145] The ERA5 original wind field is corrected in different regions, and an idealized typhoon model is constructed in the ocean region. Then, the ERA5 original wind field and the idealized typhoon model are weighted and fused to obtain the ideal corrected wind field, which is used as the new corrected wind field in the ocean region. In the land region, the maximum wind speed in the land region in the historical typhoon track data is determined. , and the maximum wind speed of the typhoon in the new ERA5 original wind field corresponding to the relocated typhoon center position is calculated , based on and The wind speed ratio is calculated and the ERA5 original wind field is corrected based on the wind speed ratio to obtain a proportionally corrected wind field. This proportionally corrected wind field is used as the new corrected wind field for the land area. In the nearshore area, a weight is calculated based on the straight-line distance between the typhoon center and the coastline and the preset straight-line distance. The new corrected wind field for the ocean region and the new corrected wind field for the land region are then merged based on the weight to obtain a merged corrected wind field. This merged corrected wind field is used as the new corrected wind field for the nearshore area.

[0146] Satellite wind speed inversion datasets such as SMAP and WindSat are used to evaluate the new revised wind fields in different regions. If the evaluation passes, the new revised wind fields of each region are embedded in the ERA5 original wind field to obtain the revised ERA5 target wind field.

[0147] In addition, it should be noted that for the reconstruction of wind fields in ocean areas, land areas, and near-shore areas, there are various correction schemes in the existing technology (such as data fusion, machine learning, etc.). However, in practical applications, such methods need to train models and adjust parameters according to the data characteristics of different regions. Due to the lack of currently available observation data, such methods are often difficult to achieve the high precision and strong adaptability required for reconstructing wind fields. However, through multiple groups of comparative experiments and verification of measured data, the wind field reconstruction strategy designed for each region in this application can make the corrected ERA5 target wind field data have stronger adaptability and higher accuracy, overcoming the limitations of traditional single methods in adaptability to complex terrains and the problem of low accuracy in reconstructing wind fields.

[0148] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the method of modifying the ERA5 wind farm in the present application. More forms of simple transformations based on this technical concept, such as the interaction and combination of various embodiments, are all within the scope of protection of the present application.

[0149] This application also provides a modified ERA5 wind farm device, please refer to Figure 7 , the modified ERA5 wind farm device comprises:

[0150] A positioning module 10 is used to relocate the typhoon center position in the ERA5 original wind field based on historical typhoon track data;

[0151] A division module 20 is used to divide the typhoon activity area into an ocean area, a land area and a nearshore area according to the straight-line distance between the typhoon center and the coastline;

[0152] A reconstruction module 30 is configured to reconstruct the ERA5 original wind fields of the ocean region, the land region, and the nearshore region using different wind field reconstruction strategies to obtain new revised wind fields of the respective regions;

[0153] The embedding module 40 is used to embed the new revised wind field of each region into the ERA5 original wind field to obtain a revised ERA5 target wind field.

[0154] Optionally, the reconstruction module 30 is further used to construct an idealized typhoon model, perform weighted fusion on the ERA5 original wind field and the idealized typhoon model to obtain an ideal corrected wind field, and use the ideal corrected wind field as a new corrected wind field in the ocean region.

[0155] Optionally, the reconstruction module 30 is further configured to determine a first maximum wind speed in a land area in the historical typhoon track data, and calculate a second maximum wind speed of the typhoon in a new ERA5 original wind field corresponding to the relocated typhoon center position;

[0156] Calculating a wind speed ratio based on the first maximum wind speed and the second maximum wind speed;

[0157] The ERA5 original wind field is corrected according to the wind speed ratio to obtain a proportionally corrected wind field, and the proportionally corrected wind field is used as a new corrected wind field for the land area.

[0158] Optionally, the reconstruction module 30 is further configured to calculate a weight based on a straight-line distance between the typhoon center and the coastline and a preset straight-line distance;

[0159] The new corrected wind field in the ocean region and the new corrected wind field in the land region are fused according to the weights to obtain a fused corrected wind field, and the fused corrected wind field is used as a new corrected wind field in the nearshore region.

[0160] Optionally, the positioning module 10 is further configured to select a first grid area at a first preset longitude and a first preset latitude with the old typhoon center position of the ERA5 original wind field as the center;

[0161] The relative vorticity in each grid in the first grid area is calculated, and the position where the typhoon wind speed is the smallest in the first grid area and the relative vorticity is greater than the average relative vorticity of the first grid area is taken as the new typhoon center position in the ERA5 original wind field.

[0162] Optionally, the embedding module 40 is further configured to use typhoon observation data at the same time and location, wherein the typhoon observation data includes historical observation data of historical typhoons or real-time observation data of the current typhoon, to evaluate the ERA5 original wind field and the new revised wind field of the respective regions;

[0163] If the evaluation is passed, the step of embedding the new revised wind field of each region into the ERA5 original wind field to obtain a revised ERA5 target wind field is performed.

[0164] The modified ERA5 wind farm device provided in this application, using the modified ERA5 wind farm method described in the aforementioned embodiment, can address the technical issues of poor adaptability and low restoration accuracy associated with traditional correction methods for reconstructing typhoon wind farms. Compared to the prior art, the modified ERA5 wind farm device provided in this application achieves the same beneficial effects as the modified ERA5 wind farm method described in the aforementioned embodiment. Other technical features of the modified ERA5 wind farm device are the same as those disclosed in the aforementioned embodiment and are not further elaborated here.

[0165] The present application provides a modified ERA5 wind farm device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the modified ERA5 wind farm method in the above-mentioned first embodiment.

[0166] Reference below Figure 8 , which shows a schematic structural diagram of a modified ERA5 wind farm device suitable for implementing embodiments of the present application. The modified ERA5 wind farm device in the embodiments of the present application may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), and in-vehicle terminals (e.g., in-vehicle navigation terminals), as well as fixed terminals such as digital TVs and desktop computers. Figure 8 The modified ERA5 wind farm equipment shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0167] like Figure 8As shown, the modified ERA5 wind farm device may include a processing device 1001 (e.g., a central processing unit, graphics processing unit, etc.), which can perform various appropriate actions and processes based on programs stored in read-only memory 1002 or programs loaded from storage device 1003 into random access memory 1004. Random access memory 1004 also stores various programs and data required for the operation of the modified ERA5 wind farm device. Processing device 1001, read-only memory 1002, and random access memory 1004 are interconnected via bus 1005. An input / output interface 1006 is also connected to the bus. Typically, the following systems may be connected to input / output interface 1006: input device 1007, such as a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output device 1008, such as a liquid crystal display (LCD), speaker, vibrator, etc.; storage device 1003, such as a magnetic tape or hard disk; and communication device 1009. Communication device 1009 can allow the modified ERA5 wind farm device to communicate with other devices wirelessly or wired to exchange data. Although the figure shows a modified ERA5 wind farm device with various systems, it should be understood that it is not required to implement or have all of the systems shown. More or fewer systems can be implemented or have alternatively.

[0168] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program comprising program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via a communication device, or installed from a storage device 1003, or installed from a read-only memory 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are performed.

[0169] The modified ERA5 wind farm device provided in this application, using the modified ERA5 wind farm method described in the aforementioned embodiment, can address the technical issues of poor adaptability and low restoration accuracy associated with traditional correction methods for reconstructing typhoon wind farms. Compared to the prior art, the modified ERA5 wind farm device provided in this application achieves the same beneficial effects as the modified ERA5 wind farm method described in the aforementioned embodiment. Other technical features of this modified ERA5 wind farm device are the same as those disclosed in the aforementioned embodiment and are not further elaborated upon here.

[0170] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0171] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0172] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, a computer program) stored thereon, wherein the computer-readable program instructions are used to execute the modified ERA5 wind farm method in the above embodiment.

[0173] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems or devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0174] The computer-readable storage medium may be included in the modified ERA5 wind farm device; or may exist independently without being assembled into the modified ERA5 wind farm device.

[0175] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the modified ERA5 wind farm equipment, the modified ERA5 wind farm equipment: relocates the typhoon center position in the ERA5 original wind field based on historical typhoon trajectory data; divides the typhoon activity area into ocean area, land area and nearshore area according to the straight-line distance between the typhoon center position and the coastline; reconstructs the ERA5 original wind field of each region in the ocean area, land area and nearshore area using different wind field reconstruction strategies to obtain new revised wind fields in each region; and embeds the new revised wind field of each region into the ERA5 original wind field to obtain a revised ERA5 target wind field.

[0176] Computer program code for performing the operations of the present application may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0177] The flow charts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, program segment or a part of code, and the module, program segment or a part of code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented by a dedicated hardware-based system that performs the specified function or operation, or can be implemented by a combination of dedicated hardware and computer instructions.

[0178] The modules described in the embodiments of the present application may be implemented in software or hardware, wherein the name of a module does not necessarily limit the unit itself.

[0179] The computer-readable storage medium provided in this application stores computer-readable program instructions (i.e., a computer program) for executing the aforementioned ERA5 wind farm correction method. This computer-readable storage medium addresses the technical issues of poor adaptability and low accuracy in reconstructing typhoon wind farms using conventional correction methods. Compared to existing technologies, the beneficial effects of the computer-readable storage medium provided in this application are similar to those of the ERA5 wind farm correction method provided in the aforementioned embodiments, and are not further elaborated here.

[0180] The present application also provides a computer program product, including a computer program, which implements the steps of the above-mentioned method for modifying the ERA5 wind farm when executed by a processor.

[0181] The computer program product provided in this application can address the technical issues of poor adaptability and low accuracy in reconstructing typhoon wind fields using conventional correction methods. Compared to existing technologies, the beneficial effects of the computer program product provided in this application are similar to those of the ERA5 wind field correction method provided in the aforementioned embodiment, and are not further elaborated here.

[0182] The above description is only part of the embodiments of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made by using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A method for correcting ERA5 wind farm, characterized in that: The method for correcting the ERA5 wind field includes: Based on historical typhoon track data, the typhoon center position in the ERA5 original wind field is relocated; The typhoon activity area is divided into ocean area, land area and nearshore area according to the straight-line distance between the typhoon center and the coastline; Reconstruct the ERA5 original wind fields of the ocean region, the land region, and the nearshore region using different wind field reconstruction strategies to obtain new revised wind fields of the respective regions; The step of reconstructing the ERA5 original wind field in the ocean region to obtain a new revised wind field includes: constructing an idealized typhoon model, weighted fusion of the ERA5 original wind field and the idealized typhoon model to obtain an ideal revised wind field, and using the ideal revised wind field as a new revised wind field in the ocean region; The step of reconstructing the ERA5 original wind field in the land area to obtain a new revised wind field includes: determining a first maximum wind speed in the land area in historical typhoon trajectory data, and calculating a second maximum wind speed of the typhoon in the new ERA5 original wind field corresponding to the relocated typhoon center position; calculating a wind speed ratio based on the first maximum wind speed and the second maximum wind speed; correcting the ERA5 original wind field according to the wind speed ratio to obtain a proportional revised wind field, and using the proportional revised wind field as a new revised wind field for the land area; The step of reconstructing the ERA5 original wind field in the nearshore area to obtain a new revised wind field includes: calculating a weight based on a straight-line distance between the typhoon center and the coastline and a preset straight-line distance; fusing the new revised wind field in the ocean area and the new revised wind field in the land area according to the weight to obtain a fused revised wind field, and using the fused revised wind field as the new revised wind field in the nearshore area; The new revised wind fields of the respective regions are embedded into the ERA5 original wind fields to obtain the revised ERA5 target wind fields.

2. The method for correcting an ERA5 wind farm according to claim 1, wherein: The step of relocating the typhoon center position in the ERA5 original wind field based on historical typhoon track data includes: Taking the old typhoon center position of the ERA5 original wind field as the center, select the first grid area under the first preset longitude and the first preset latitude; The relative vorticity in each grid in the first grid area is calculated, and the position where the typhoon wind speed is the smallest in the first grid area and the relative vorticity is greater than the average relative vorticity of the first grid area is taken as the new typhoon center position in the ERA5 original wind field.

3. The method for correcting an ERA5 wind farm according to claim 1, wherein: Before the step of embedding the new revised wind field of each region into the ERA5 original wind field to obtain the revised ERA5 target wind field, the method includes: Using typhoon observation data at the same time and location, wherein the typhoon observation data includes historical observation data of historical typhoons or real-time observation data of current typhoons, to evaluate the ERA5 original wind field and the new revised wind field of the respective regions; If the evaluation is passed, the step of embedding the new revised wind field of each region into the ERA5 original wind field to obtain a revised ERA5 target wind field is performed.

4. A modified ERA5 wind farm device, characterized in that: The modified ERA5 wind farm device comprises: Positioning module, used to relocate the typhoon center position in the ERA5 original wind field based on historical typhoon track data; A division module, configured to divide the typhoon activity area into an ocean area, a land area, and a nearshore area according to the straight-line distance between the typhoon center and the coastline; A reconstruction module is used to reconstruct the ERA5 original wind field of the ocean region, the land region and the nearshore region using different wind field reconstruction strategies to obtain a new revised wind field of the respective region; The reconstruction module is also used to construct an idealized typhoon model, perform weighted fusion of the ERA5 original wind field and the idealized typhoon model to obtain an ideal corrected wind field, and use the ideal corrected wind field as a new corrected wind field in the ocean region; The reconstruction module is further configured to determine a first maximum wind speed in the land area in the historical typhoon trajectory data, and calculate a second maximum wind speed of the typhoon in a new ERA5 original wind field corresponding to the relocated typhoon center position; calculate a wind speed ratio based on the first maximum wind speed and the second maximum wind speed; and correct the ERA5 original wind field according to the wind speed ratio to obtain a proportionally corrected wind field, and use the proportionally corrected wind field as a new corrected wind field in the land area; The reconstruction module is further configured to calculate a weight based on the straight-line distance between the typhoon center and the coastline and a preset straight-line distance; fuse the new corrected wind field in the ocean region and the new corrected wind field in the land region according to the weight to obtain a fused corrected wind field, and use the fused corrected wind field as the new corrected wind field in the nearshore region; The embedding module is used to embed the new revised wind field of each region into the ERA5 original wind field to obtain the revised ERA5 target wind field.

5. A modified ERA5 wind farm device, characterized in that: The device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the method for modifying the ERA5 wind farm according to any one of claims 1 to 3.

6. A storage medium, characterized in that The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the method for correcting an ERA5 wind farm according to any one of claims 1 to 3 are implemented.

7. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the method for modifying the ERA5 wind farm according to any one of claims 1 to 3 are implemented.

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